Optical transmission method, apparatus, optical module, device and system

Abstract

The application discloses an optical transmission method and device, an optical module, equipment and a system, and relates to the technical field of optical transmission. The method is applied to a first device, the first device comprises a plurality of modulators, different modulators correspond to optical signals of different wavelengths, wherein the first value range of the chirp parameters corresponding to the modulators of different wavelengths is different, and the dispersion cost generated by the transmission of the optical signals by using the chirp parameters in the first value range is lower than a preset threshold. The method comprises the following steps: acquiring data to be transmitted; and transmitting the data in the form of optical signals by using the plurality of modulators.

Description

Technical Field

[0001] This application relates to the field of optical transmission technology, and in particular to an optical transmission method, apparatus, optical module, device and system. Background Technology

[0002] In optical transmission systems, optical interconnection technologies based on wavelength division multiplexing (WDM) combined with intensity modulation direct detection (IMDD) are typically used to achieve optical interconnection between data centers.

[0003] However, in the aforementioned optical transmission systems, signal distortion may occur due to chromatic dispersion (CD) in the optical fiber, leading to a degraded transmission performance. Chromatic dispersion refers to the difference in propagation delay caused by different wavelengths of light signals traveling at different rates within the optical fiber. Currently, to address this performance degradation, it is necessary to increase the transmit power or receive sensitivity of the optical signal, which incurs the cost of chromatic dispersion. Summary of the Invention

[0004] This application provides an optical transmission method, apparatus, optical module, device, and system for reducing the dispersion cost generated during optical transmission.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, an optical transmission method is provided. This method can be executed by a first device, or by a component of the first device, such as a processor, chip, or chip system of the first device, or by a logic module or software capable of implementing all or part of the functions of the first device.

[0007] The first device includes multiple modulators, each corresponding to an optical signal of a different wavelength. The chirp parameters for the different wavelength modulators have different first value ranges. In this application, the dispersion cost of transmitting optical signals using chirp parameters within the first value range is lower than a preset threshold.

[0008] The method includes: a first device acquiring data to be transmitted; the first device employing multiple modulators to transmit the data in the form of optical signals.

[0009] In the above technical solution, by using chirp parameters within the first value range to transmit optical signals, the resulting dispersion cost is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0010] It is worth noting that different modulators modulate optical signals of different wavelengths, and optical signals of different wavelengths produce different chromatic dispersions during transmission. In this application, the first value range of the chirp parameter corresponding to different modulators is determined based on the chromatic dispersion produced by optical signals of different wavelengths. Therefore, the first value range of the chirp parameter corresponding to different modulators is different, which means that the first value range of the chirp parameter corresponding to different wavelength modulators is different. Thus, for modulators of different wavelengths, the first value range of the chirp parameter corresponding to each wavelength modulator is specifically determined so that the chirp parameter of each wavelength modulator is within the corresponding first value range. This ensures that the dispersion cost generated when using each modulator to transmit optical signals is lower than a preset threshold, effectively reducing the dispersion cost generated during optical transmission.

[0011] In some possible implementations, in an optical transmission system with a transmission rate of 800 Gbps (i.e., 800 gigabits per second), a transmission distance of 5 kilometers, and based on coarse wavelength division multiplexing (CWDM4), the first value range of the chirp parameter of the 1271 nm modulator is (0.1, 1); the first value range of the chirp parameter of the 1331 nm modulator is (-1, 0.4).

[0012] The transmission rate of 800Gbps can be considered as falling within a first error range of 800Gbps, meaning the transmission rate is approximately 800Gbps. This first error range can be ±10, ±50, ±100 (unit: Gbps), or other ranges; this application does not limit the first error range. For example, using a first error range of ±100 means the actual transmission rate might be between 700Gbps and 900Gbps.

[0013] A wavelength of 1271 nm can be considered as falling within a second error range of 1271 nm, meaning the wavelength is approximately 1271 nm. This second error range can be ±0.5, ±1, ±2 (unit: nm), or other ranges; this application does not limit the second error range. For example, a second error range of ±2 means the actual wavelength might be between 1269 nm and 1273 nm. Similarly, a wavelength of 1331 nm can be considered as falling within a second error range of 1331 nm, meaning the wavelength is approximately 1331 nm. For example, a second error range of ±2 means the actual wavelength might be between 1329 nm and 1333 nm.

[0014] In some possible implementations, in an optical transmission system based on CWDM4 with a transmission rate of 800Gbps and a transmission distance of up to 5km, the first value range of the chirp parameter of the modulator with a wavelength of 1291nm is (-0.2, 1); and the first value range of the chirp parameter of the modulator with a wavelength of 1311nm is (-1, 1).

[0015] The wavelength 1291nm can be considered as falling within the second error range of 1291nm, meaning the wavelength is approximately 1291nm. For example, a second error range of ±2 implies the actual wavelength might be between 1289nm and 1293nm. Similarly, the wavelength 1311nm can be considered as falling within the second error range of 1311nm, meaning the wavelength is approximately 1311nm. For example, a second error range of ±2 implies the actual wavelength might be between 1309nm and 1313nm.

[0016] In the above embodiments, for an 800Gbps optical transmission system, a first range of chirp parameters corresponding to modulators of different wavelengths is provided, thereby effectively reducing the dispersion cost generated during optical transmission in the 800Gbps optical transmission system. It is worth noting that in the 800Gbps optical transmission system, for the four types of modulators—1271nm, 1291nm, 1311nm, and 1331nm—chirp parameters can be selectively configured for any two or more modulators, so that the chirp parameters of the selected modulators are within the corresponding first range of values.

[0017] In some possible implementations, in an optical transmission system based on CWDM4 with a transmission rate of 1.6 Tbps (i.e., 1.6 terabits per second) and a transmission distance of up to 3 km, the first value range of the chirp parameter of the 1271 nm modulator is (0.7, 1); the first value range of the chirp parameter of the 1331 nm modulator is (-1, -0.3).

[0018] The transmission rate of 1.6Tbps can be considered as falling within a third error range of 1.6Tbps, meaning the transmission rate is approximately 1.6Tbps. This third error range can be ±0.1, ±0.2, ±0.3 (unit: Tbps), or other ranges; this application does not limit the third error range. For example, a third error range of ±0.3 implies that the actual transmission rate could be between 1.3Tbps and 1.9Tbps.

[0019] In some possible implementations, in an optical transmission system based on CWDM4 with a transmission rate of 1.6Tbps and a transmission distance of up to 3km, the first value range of the chirp parameter of the modulator with a wavelength of 1291nm is (0.3, 1); and the first value range of the chirp parameter of the modulator with a wavelength of 1311nm is (-1, 1).

[0020] In the above embodiments, for a 1.6Tbps optical transmission system, a first range of chirp parameters corresponding to modulators of different wavelengths is provided, thereby effectively reducing the dispersion cost generated during optical transmission in the 1.6Tbps optical transmission system. It is worth noting that in the 1.6Tbps optical transmission system, for the four types of modulators—1271nm, 1291nm, 1311nm, and 1331nm—chirp parameters can be selectively configured for any two or more modulators, so that the chirp parameters of the selected modulators are within the corresponding first range of values.

[0021] In some possible implementations, before the first device employs multiple modulators to transmit data in the form of optical signals, for each modulator, the method further includes: configuring the chirp parameter of the modulator based on a first value range corresponding to the modulator.

[0022] For example, the chirp parameter of the modulator is configured to a first value based on a first value range corresponding to the modulator.

[0023] The first value is within the range of the first value corresponding to the modulator. In this way, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured with the first value is lower than a preset threshold.

[0024] In the above embodiments, a process is provided to configure the chirp parameter of the modulator using a first value range. By configuring the chirp parameter of the modulator to a first value, such that the first value is within the first value range corresponding to the modulator, the dispersion cost generated when the optical signal is transmitted using the modulator configured with the first value is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0025] In some possible implementations, the modulator includes a splitter. The chirp parameter is related to the unequal splitting ratio of the splitter. The chirp parameter is configured by configuring the unequal splitting ratio of the splitter. Accordingly, the chirp parameter configuration process can be: determining a first splitting ratio based on a first value; configuring the unequal splitting ratio of the modulator to the first splitting ratio. Here, the first splitting ratio refers to the unequal splitting ratio determined based on the first value.

[0026] The unequal splitting ratio is a parameter introduced by the beam splitter within the modulator, used to distribute the input optical signal to different output ports in an unequal proportion. For example, the unequal splitting ratio introduced by the beam splitter can be 0.5 + Δ: 0.5 - Δ, meaning the input optical signal is distributed in a ratio of 0.5 + Δ: 0.5 - Δ, with one output port receiving 0.5 + Δ optical power and the other receiving 0.5 - Δ optical power. Here, Δ represents the deviation value of the unequal splitting ratio.

[0027] For example, the chirp parameter is related to the deviation value of the unequal splitting ratio. For instance, the absolute value of the chirp parameter is equal to four times the deviation value of the unequal splitting ratio. Thus, based on the relationship between the absolute value of the chirp parameter and the deviation value of the unequal splitting ratio, the deviation value of the unequal splitting ratio corresponding to the first value can be determined. Furthermore, based on the determined deviation value of the unequal splitting ratio and 0.5 + Δ: 0.5 - Δ, the first splitting ratio can be determined.

[0028] In the above embodiments, a method for configuring the absolute value of the chirp parameter is provided. Specifically, the absolute value of the chirp parameter can be configured by adjusting the unequal splitting ratio of the modulator.

[0029] In some possible implementations, radio frequency (RF) signals are loaded onto the two optical transmission paths of the modulator. The chirp parameter is related to the voltage amplitude value of the RF signal. The chirp parameter is configured by configuring the voltage amplitude value of the RF signal. Accordingly, the chirp parameter configuration process can be: determining a first amplitude value based on a first value; configuring the voltage amplitude value of the RF signal as the first amplitude value. Here, the first amplitude value refers to the voltage amplitude value determined based on the first value.

[0030] In this context, the radio frequency (RF) signal refers to the voltage signal applied to the two optical transmission paths of the modulator (i.e., the upper and lower arms of the modulator), used to modulate the optical signal, such as through phase modulation or amplitude modulation. For example, the RF signal can be (1+Δ)s(t) and -(1-Δ)s(t). Here, (1+Δ) and -(1-Δ) are the voltage amplitude values ​​of the RF signal. Δ represents the deviation of the voltage amplitude value.

[0031] For example, the chirp parameter is related to the deviation of the voltage amplitude value. For instance, the absolute value of the chirp parameter is equal to the deviation of the voltage amplitude value. Thus, based on the relationship between the absolute value of the chirp parameter and the deviation of the voltage amplitude value, the deviation of the voltage amplitude value corresponding to the first value can be determined. Furthermore, based on the determined deviation of the voltage amplitude value and (1+Δ) and -(1-Δ), the first amplitude value can be determined.

[0032] In the above embodiments, a method for configuring the absolute value of the chirp parameter is provided. Specifically, the absolute value of the chirp parameter can be configured by adjusting the voltage amplitude of the modulator's radio frequency signal.

[0033] In some possible implementations, the modulator includes a beam splitter and radio frequency (RF) signals are loaded on both optical transmission paths. The chirp parameter is related to the unequal splitting ratio of the modulator and the voltage amplitude of the RF signal. The chirp parameter is configured by configuring the unequal splitting ratio of the beam splitter and the voltage amplitude of the RF signal. Accordingly, the chirp parameter configuration process can be: determining a first splitting ratio and a first amplitude value based on a first value; configuring the unequal splitting ratio of the beam splitter as the first splitting ratio, and configuring the voltage amplitude of the RF signal as the first amplitude value.

[0034] For example, the unequal splitting ratio introduced by the beam splitter can be 0.5 + Δ1 : 0.5 - Δ1. Here, Δ1 represents the deviation value of the splitting ratio. The radio frequency signal can be (1 + Δ2)s(t) and -(1 - Δ2)s(t). Here, Δ2 represents the deviation value of the voltage amplitude.

[0035] For example, the chirp parameter is related to the deviation values ​​of the unequal splitting ratio and the voltage amplitude. For instance, the absolute value of the chirp parameter is equal to four times the deviation value of the unequal splitting ratio and the sum of the deviation value of the voltage amplitude. Thus, based on the relationship between the absolute value of the chirp parameter and the deviation values ​​of the unequal splitting ratio and the voltage amplitude, the deviation values ​​of the unequal splitting ratio and the voltage amplitude corresponding to the first value can be determined. Furthermore, based on the determined deviation values ​​of the unequal splitting ratio and 0.5 + Δ1: 0.5 - Δ1, the first splitting ratio can be determined, and based on the determined deviation value of the voltage amplitude and (1 + Δ2) and -(1 - Δ2), the first amplitude value can be determined.

[0036] In the above embodiments, a method for configuring the absolute value of the chirp parameter is provided. Specifically, the absolute value of the chirp parameter can be configured by adjusting the unequal splitting ratio of the modulator and the voltage amplitude of the radio frequency signal.

[0037] In some possible implementations, the modulator is loaded with a bias voltage. The polarity of the chirp parameter is related to the voltage range of the modulator's bias voltage. The chirp parameter is configured by configuring the voltage range of the bias voltage. Accordingly, the chirp parameter configuration process can be: configuring the voltage range of the modulator's bias voltage based on the polarity of the chirp parameter indicated by a first value.

[0038] The bias voltage is used to set the bias point (or operating point) of the modulator at a specific position to achieve the desired modulation function.

[0039] When the voltage range is configured as the first range, the intensity of the output optical signal is negatively correlated with the voltage of the applied radio frequency signal, resulting in a positive chirp parameter. When the voltage range is configured as the second range, the intensity of the output optical signal is positively correlated with the voltage of the applied radio frequency signal, resulting in a negative chirp parameter.

[0040] In other words, when a positive chirp parameter is required, the bias voltage range is configured as a first range. For example, this can be achieved by setting the modulator's bias point at a position corresponding to the first range. When a negative chirp parameter is required, the bias voltage range is configured as a second range. For example, this can be achieved by setting the modulator's bias point at a position corresponding to the second range.

[0041] In the above embodiments, a method for configuring the polarity of the chirp parameter is provided. Specifically, the polarity of the chirp parameter can be configured by adjusting the voltage range of the bias voltage.

[0042] In some possible implementations, the deviation between the first values ​​configured for the chirp parameters of multiple modulators is less than a preset deviation value. The preset deviation value refers to a pre-set deviation value, such as 0.2, 0.3, or other values. This means that the first values ​​configured for the chirp parameters of multiple modulators are similar. Thus, when faced with selecting values ​​for the chirp parameters of different modulators, the principle of making the values ​​of the chirp parameters of multiple modulators similar can be used to select the corresponding first value. This reduces the differences in the chirp parameters of different modulators, making the chirp parameters of different modulators more consistent, thereby reducing the complexity between the chirp parameters of different modulators and making the management of the chirp parameters of different modulators easier.

[0043] In some possible implementations, in a CWDM4-based optical transmission system with a transmission rate of 800 Gbps and a transmission distance of up to 5 km, the chirp parameters of multiple modulators are configured with a first value within the range of (0.1, 0.4). By constraining the configured values ​​of the chirp parameters of multiple modulators to the range of (0.1, 0.4), the values ​​of the chirp parameters of multiple modulators are made similar, reducing the differences in chirp parameters between different modulators, making the chirp parameters of different modulators more consistent, thereby reducing the complexity between the chirp parameters of different modulators and making the management of the chirp parameters of different modulators easier.

[0044] In some possible implementations, the first value range is determined based on a first candidate value among multiple candidate values ​​of the chirp parameter. The first candidate value is a candidate value whose dispersion cost is below a preset threshold and falls within the dispersion range corresponding to the modulator. It is understood that the dispersion range corresponding to the modulator refers to the range of chromatic dispersion generated by the optical signal transmitted by the modulator during transmission.

[0045] The first candidate value is determined based on the optical transmission simulation results. These simulation results characterize the dispersion cost corresponding to multiple candidate values ​​obtained from the simulated transmission of the optical signal based on these candidate values. For example, the optical transmission simulation results can be obtained through system simulation, system experiments, or system analysis. Then, under the condition of the dispersion range corresponding to the modulator, the chirp parameters of different candidate values ​​are scanned, and candidate values ​​of chirp parameters with dispersion costs lower than a preset threshold and within that dispersion range are selected; that is, the first candidate value is obtained.

[0046] In the above embodiments, a method for determining a first value range is provided, which can quickly and efficiently determine the first value range corresponding to different modulators. Furthermore, by using the first value range corresponding to different modulators, the value range of the chirp parameter of different modulators is constrained, so that when optical signals are transmitted using modulators whose chirp parameters are within the first value range, the resulting dispersion cost is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0047] Secondly, an optical transmission method is provided, which can be executed by a first device, or by a component of the first device, such as a processor, chip, or chip system of the first device, or by a logic module or software that can implement all or part of the functions of the first device.

[0048] The method includes: a first device sending a first optical signal to a second device; the first device receiving a second optical signal sent by the second device; and the first device adjusting the chirp parameters of the modulator of the first device based on the second optical signal.

[0049] In the above technical solution, after the first device transmits a first optical signal to the second device, the second device returns a second optical signal to the first device based on the first optical signal. Then, the first device adjusts the chirp parameter of its modulator according to the indication of the second optical signal. Thus, through the cooperation of the first and second devices, the chirp parameter can be adjusted according to the actual transmission of the optical signal, thereby achieving precise adjustment of the chirp parameter.

[0050] In some possible implementations, the second optical signal carries a second value corresponding to the modulator to be adjusted. In this application, by using the chirp parameter of the second value to transmit the optical signal, the resulting dispersion cost is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0051] Accordingly, based on the second optical signal, the chirp parameter of the modulator of the first device is adjusted, including: configuring the chirp parameter of the modulator to the second value based on the second value carried by the second optical signal.

[0052] In the above embodiment, by carrying a second value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the second value. This ensures that the dispersion cost generated when transmitting an optical signal using a modulator configured with the second value is below a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0053] In some possible implementations, the second optical signal carries a second value range corresponding to the modulator to be adjusted. In this application, by using chirp parameters within the second value range to transmit the optical signal, the resulting dispersion cost is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0054] Accordingly, adjusting the chirp parameter of the modulator of the first device based on the second optical signal includes: configuring the chirp parameter of the modulator based on a second value range carried by the second optical signal. For example, the chirp parameter of the modulator is configured to a second value within the second value range, based on the second value range carried by the second optical signal.

[0055] In the above embodiment, by carrying a second value range corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the second value range, so as to configure the chirp parameter of the modulator to a second value. In this way, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured to the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0056] In some possible implementations, the second optical signal carries the delay of the first optical signal being transmitted to the second device. This delay can be measured by the second device based on actual transmission conditions. For example, the first optical signal may include optical signals of multiple wavelengths. This means that the second optical signal carries the delay of transmitting multiple wavelengths of optical signals to the second device respectively.

[0057] Accordingly, based on the second optical signal, the chirp parameter of the modulator of the first device is adjusted, including: determining a second value range corresponding to the modulator based on the time delay of the transmission of the first optical signal carried by the second optical signal to the second device; and configuring the chirp parameter of the modulator based on the second value range corresponding to the modulator. For example, based on the second value range corresponding to the modulator, the chirp parameter of the modulator is configured to a second value, where the second value is within the second value range corresponding to the modulator.

[0058] In the above embodiment, the delay in the transmission of the first optical signal to the second device, carried by the second optical signal, is used to instruct the first device to adjust the chirp parameter of the modulator based on the delay in the transmission of the first optical signal to the second device. Specifically, a second value range corresponding to the modulator is determined based on the delay in the transmission of the first optical signal to the second device, and then the chirp parameter of the modulator is configured to a second value based on the second value range corresponding to the modulator. In this way, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured with the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0059] In some possible implementations, a second value range corresponding to the modulator is determined based on the time delay of the transmission of the first optical signal carried by the second optical signal to the second device, including:

[0060] Based on the time delay of the first optical signal transmission to the second device, a target functional relationship is determined. This target functional relationship indicates the functional relationship between the dispersion value and the wavelength value. The wavelength value can be the center value of the wavelength channel where the optical signal resides, i.e., the center value between the upper and lower wavelength boundaries, or it can be any wavelength value of the wavelength channel where the optical signal resides, i.e., any value between the upper and lower wavelength boundaries. This application does not limit this.

[0061] Based on the relationship between the wavelength value corresponding to the modulator and the objective function, the dispersion value corresponding to the modulator is determined. In other words, the dispersion value corresponding to the wavelength value is determined from the objective function relationship, which is the dispersion value corresponding to the modulator.

[0062] Based on the dispersion value corresponding to the modulator and the optical transmission simulation results, a second candidate value for the modulator is determined. The optical transmission simulation results are used to characterize the dispersion cost obtained from simulating optical signal transmission based on multiple candidate values ​​of the chirp parameter.

[0063] Understandably, the first device can pre-store optical transmission simulation results. The second candidate value is a candidate value whose dispersion cost is lower than a preset threshold and corresponds to the dispersion value. For example, under the condition of the dispersion value corresponding to the modulator, the chirp parameters of different candidate values ​​can be scanned, and the candidate value of the chirp parameter whose dispersion cost is lower than the preset threshold and corresponds to the dispersion value can be selected, that is, the second candidate value is selected.

[0064] Then, based on the second candidate value corresponding to the modulator, the second value range corresponding to the modulator is determined.

[0065] In the above embodiments, a method is provided for a first device to determine a second value range, which can quickly and efficiently determine the second value range corresponding to different modulators. Furthermore, by further constraining the value range of the chirp parameter of the modulator of the first device based on the second value range, precise adjustment of the chirp parameter can be achieved.

[0066] It is worth noting that the first value range mentioned in this application is determined based on a first candidate value selected using the dispersion range corresponding to the modulator as a condition, and the second value range mentioned in this application is determined based on a second candidate value selected using the dispersion value corresponding to the modulator as a condition. The dispersion range corresponding to the modulator is calculated based on the wavelength of the optical signal transmitted by the modulator (including the upper and lower wavelength boundaries). The dispersion value corresponding to the modulator is calculated based on the actual transmission delay. Compared with the first value range, the second value range, by referencing the actual transmission delay, increases the amount of referenced information, enabling a more accurate calculation of the second value range, thereby achieving precise adjustment of the chirp parameter.

[0067] In some possible implementations, the first optical signal includes optical signals of multiple wavelengths. Accordingly, based on the time delay of the first optical signal transmitted to the second device, a target function relationship is determined, including: for every two wavelengths of optical signal, determining the dispersion value corresponding to the average wavelength value based on the time delay and wavelength value of the two wavelengths. The average wavelength value is the average wavelength value of the two wavelengths of optical signal, i.e., the average value of the wavelength values ​​of the two optical signals. Furthermore, the target function relationship is obtained by fitting (e.g., least squares fitting) the multiple average wavelength values ​​with the corresponding dispersion values.

[0068] In the above embodiments, a method is provided whereby the first device obtains a target functional relationship based on fitting. Furthermore, this target functional relationship indicates the functional relationship between dispersion values ​​and wavelength values, facilitating the subsequent determination of the dispersion values ​​corresponding to different modulators based on the target functional relationship, thereby determining the second value range corresponding to different modulators. It is understood that since the target functional relationship is a functional relationship obtained through fitting that indicates the relationship between dispersion values ​​and wavelength values, the dispersion value corresponding to the modulator is an estimated value based on this fitted functional relationship of the target functional relationship.

[0069] In some possible implementations, the second optical signal carries the dispersion value corresponding to the modulator to be regulated.

[0070] Accordingly, based on the second optical signal, the chirp parameter of the modulator of the first device is adjusted, including: determining a second value range corresponding to the modulator based on the dispersion value of the modulator to be adjusted carried by the second optical signal; and configuring the chirp parameter of the modulator to a second value based on the second value range corresponding to the modulator, wherein the second value is within the second value range corresponding to the modulator.

[0071] In the above embodiment, by carrying the dispersion value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the dispersion value corresponding to the modulator to be adjusted. Specifically, a second value range corresponding to the modulator is determined according to the dispersion value corresponding to the modulator to be adjusted, and then the chirp parameter of the modulator is configured to a second value based on the second value range corresponding to the modulator. In this way, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured with the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0072] In some possible implementations, the information carried by the second optical signal is included in the free space of the data frame transmitted by the second optical signal. Thus, by carrying chirp reference information through the free space of the data frame, information exchange between the second device and the first device can be achieved.

[0073] In some possible implementations, the modulator is loaded with a bias voltage. The chirp parameter is related to the voltage value of the modulator's bias voltage. The chirp parameter is adjusted by adjusting the voltage value of the bias voltage. Accordingly, the chirp parameter adjustment process may be: determining a target voltage value based on a second value; configuring the modulator's bias voltage value to the target voltage value.

[0074] In the above embodiments, a method for adjusting the chirp parameter is provided. Specifically, the chirp parameter can be adjusted by regulating the bias voltage of the modulator.

[0075] In some possible implementations, the modulator includes a beam splitter. The chirp parameter is related to the unequal splitting ratio of the beam splitter. The chirp parameter is adjusted by adjusting the unequal splitting ratio of the beam splitter. Accordingly, the process of adjusting the chirp parameter can be: determining a second splitting ratio based on a second value; configuring the unequal splitting ratio of the beam splitter to the second splitting ratio.

[0076] In the above embodiments, a method for adjusting the chirp parameter is provided. Specifically, the chirp parameter can be adjusted by regulating the unequal splitting ratio of the beam splitter.

[0077] In some possible implementations, radio frequency (RF) signals are loaded onto the two optical transmission paths of the modulator. The chirp parameter is related to the voltage amplitude of the RF signal of the modulator. The chirp parameter is adjusted by adjusting the voltage amplitude of the RF signal. Accordingly, the chirp parameter adjustment process can be: determining a second amplitude value based on a second value; configuring the voltage amplitude of the RF signal to the second amplitude value.

[0078] In the above embodiments, a method for adjusting the chirp parameter is provided. Specifically, the chirp parameter can be adjusted by regulating the voltage amplitude of the modulator's radio frequency signal.

[0079] In some possible implementations, the modulator includes a beam splitter and radio frequency (RF) signals are loaded on both optical transmission paths. The chirp parameter is related to the unequal splitting ratio of the modulator and the voltage amplitude of the RF signal. The chirp parameter is adjusted by adjusting the unequal splitting ratio of the beam splitter and the voltage amplitude of the RF signal. Accordingly, the chirp parameter adjustment process can be: determining a second splitting ratio and a second amplitude value based on a second value; configuring the unequal splitting ratio of the beam splitter to the second splitting ratio, and configuring the voltage amplitude of the RF signal to the second amplitude value.

[0080] In the above embodiments, a method for adjusting the chirp parameter is provided. Specifically, the chirp parameter can be adjusted by regulating the unequal splitting ratio of the modulator and the voltage amplitude of the radio frequency signal.

[0081] In some possible implementations, there are multiple modulators, and the deviation between the second values ​​configured for the chirp parameters of the multiple modulators is less than a preset deviation value. The preset deviation value refers to a pre-set deviation value, such as 0.2, 0.3, or other values. This means that the second values ​​configured for the chirp parameters of the multiple modulators are similar. Thus, when faced with selecting the values ​​of the chirp parameters of different modulators, the principle of making the values ​​of the chirp parameters of multiple modulators similar can be used to select the corresponding second value. This reduces the differences in the chirp parameters of different modulators, making the chirp parameters of different modulators more consistent, thereby reducing the complexity between the chirp parameters of different modulators and making the management of the chirp parameters of different modulators easier.

[0082] Thirdly, an optical transmission method is provided, which can be executed by a second device, or by a component of the second device, such as the processor, chip, or chip system of the second device, or by a logic module or software that can implement all or part of the functions of the second device.

[0083] The method includes: a second device receiving a first optical signal transmitted by a first device; and the second device transmitting a second optical signal to the first device based on the first optical signal. The second optical signal carries chirp reference information used to adjust the chirp parameters of the modulator of the first device.

[0084] In the above technical solution, after the first device transmits a first optical signal to the second device, the second device returns a second optical signal to the first device based on the first optical signal. Then, the first device adjusts the chirp parameters of its modulator according to the chirp reference information carried in the second optical signal. Thus, through the cooperation of the first and second devices, the chirp parameters can be adjusted according to the actual transmission of the optical signal, thereby achieving precise adjustment of the chirp parameters.

[0085] In some possible implementations, the chirp reference information includes a second value corresponding to the modulator to be adjusted. By transmitting optical signals using the chirp parameter with the second value, the resulting dispersion cost is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0086] In some possible implementations, the chirp reference information includes a second value range corresponding to the modulator to be adjusted. By transmitting optical signals using chirp parameters within the second value range, the resulting dispersion cost is lower than a preset threshold, effectively reducing the dispersion cost generated during optical transmission.

[0087] In some possible implementations, there are multiple modulators, with different modulators corresponding to optical signals of different wavelengths. For each modulator, the process of determining the second value range includes: determining the dispersion value corresponding to the modulator based on the relationship between the wavelength value of the optical signal transmitted by the modulator and the objective function; determining a second candidate value corresponding to the modulator based on the dispersion value corresponding to the modulator and the optical transmission simulation results; and further determining the second value range corresponding to the modulator based on the second candidate value. It is understood that the second device may also pre-store the optical transmission simulation results.

[0088] In the above embodiments, a method is provided for the second device to determine the second value range, which can quickly and efficiently determine the second value range corresponding to different modulators. Furthermore, by feeding back the second value range to the first device, the value range of the chirp parameter of the modulator of the first device is further constrained, and precise adjustment of the chirp parameter can be achieved.

[0089] In some possible implementations, the process of determining the objective function relationship includes: acquiring the time delay of multiple wavelengths of optical signals transmitted to the second device; and, for every two wavelengths of optical signals, determining the dispersion value corresponding to the average wavelength value based on the time delay and wavelength value of the two wavelengths of optical signals; and then, fitting the multiple average wavelength values ​​with the dispersion values ​​corresponding to the multiple average wavelength values ​​to obtain the objective function relationship.

[0090] In the above embodiments, a method is provided whereby a second device obtains a target functional relationship based on fitting. Furthermore, this target functional relationship indicates the functional relationship between dispersion values ​​and wavelength values, facilitating the subsequent determination of dispersion values ​​corresponding to different modulators based on the target functional relationship, thereby determining a second value range corresponding to different modulators.

[0091] In some possible implementations, the chirp reference information includes the time delay of the first optical signal transmission to the second device. This time delay can be measured by the second device based on actual transmission conditions. For example, the first optical signal includes optical signals of multiple wavelengths. Thus, by carrying the time delay of the first optical signal transmission to the second device in the second optical signal, the first device is instructed to adjust the chirp parameters of the modulator based on this time delay.

[0092] In some possible implementations, the chirp reference information includes the dispersion value corresponding to the modulator to be adjusted. Thus, by carrying the dispersion value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameters of the modulator based on the dispersion value corresponding to the modulator to be adjusted.

[0093] In some possible implementations, the chirp reference information is included in the free space field of the data frame transmitted by the second optical signal. Thus, by carrying the chirp reference information in the free space field of the data frame, communication between the second device and the first device can be achieved.

[0094] Fourthly, an optical transmission device is provided for implementing any of the methods provided in the first aspect. The optical transmission device includes modules, units, or means corresponding to the above-described methods. The actions performed by these modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above-described functions.

[0095] In one possible implementation, the device may include an acquisition module and a transmission module; wherein:

[0096] The acquisition module is used to acquire the data to be transmitted.

[0097] The transmission module is used to transmit data in the form of optical signals using multiple modulators.

[0098] Fifthly, an optical transmission device is provided for implementing any of the methods provided in the second aspect above. The optical transmission device includes modules, units, or means corresponding to the methods described above. The actions performed by these modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the functions described above.

[0099] In one possible implementation, the device may include a transmitting module, a receiving module, and an adjustment module; wherein:

[0100] The transmitting module is used to send a first optical signal to the second device;

[0101] The receiving module is used to receive the second optical signal sent by the second device;

[0102] The adjustment module is used to adjust the chirp parameters of the modulator of the first device based on the second optical signal.

[0103] Sixthly, an optical transmission device is provided for implementing any of the methods provided in the third aspect above. The optical transmission device includes modules, units, or means corresponding to the above methods, and the actions performed by these modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0104] In one possible implementation, the device may include a receiving module and a transmitting module; wherein:

[0105] The receiving module is used to receive the first optical signal sent by the first device;

[0106] The transmitting module is used to transmit a second optical signal to the first device based on the first optical signal. The second optical signal carries chirp reference information, which is used to adjust the chirp parameters of the modulator of the first device.

[0107] In a seventh aspect, an optical module is provided, including multiple modulators, a processor, and an interface. Different modulators correspond to optical signals of different wavelengths, and the first value range of the chirp parameter corresponding to the different wavelength modulators is different. The dispersion cost generated by transmitting optical signals using chirp parameters within the first value range is lower than a preset threshold. The interface is used to transmit optical signals. The processor is used to implement the method of the first aspect, the second aspect, or any implementation thereof.

[0108] Eighthly, a first device is provided, comprising: a plurality of modulators and a processor, wherein different modulators correspond to optical signals of different wavelengths, the first value range of the chirp parameter corresponding to the different wavelength modulators is different, the dispersion cost generated by transmitting the optical signal using the chirp parameter within the first value range is lower than a preset threshold, and the processor is used to implement the method of the first aspect, the second aspect or any implementation thereof.

[0109] The first device in the eighth aspect can be: the first device in any implementation of the first or second aspect, or an apparatus containing the first device, or an apparatus contained in the first device, such as a chip.

[0110] A ninth aspect provides a second device comprising: a processor, the processor being configured to implement the method of the third aspect or any implementation thereof.

[0111] The second device in the ninth aspect can be: the second device in any implementation of the third aspect, or an apparatus containing the second device, or an apparatus contained in the second device, such as a chip.

[0112] In a tenth aspect, an optical transmission system is provided, comprising a first device as described in the eighth aspect above and a second device as described in the ninth aspect above.

[0113] The technical effects of any of the implementation methods in aspects four through ten can be found in the technical effects of the corresponding implementation methods in aspects one, two, or three, and will not be repeated here.

[0114] All possible implementations of any of the above aspects can be combined, provided that the solutions do not contradict each other. Attached Figure Description

[0115] Figure 1 This is a schematic diagram of the architecture of an optical transmission system provided in an embodiment of this application;

[0116] Figure 2 A schematic diagram of the hardware structure of an optical module provided in an embodiment of this application;

[0117] Figure 3 This is a schematic diagram of the hardware structure of a communication device provided in an embodiment of this application;

[0118] Figure 4 A schematic flowchart of an optical transmission method provided in an embodiment of this application;

[0119] Figure 5 A schematic diagram illustrating an optical transmission simulation result provided in an embodiment of this application;

[0120] Figure 6 This is a schematic diagram of the structure of a modulator provided in an embodiment of this application;

[0121] Figure 7 This is a schematic diagram of another modulator provided in an embodiment of this application;

[0122] Figure 8 This is a schematic diagram of another modulator provided in an embodiment of this application;

[0123] Figure 9 A schematic flowchart illustrating another optical transmission method provided in an embodiment of this application;

[0124] Figure 10 This is a schematic diagram of the structure of a data frame provided in an embodiment of this application;

[0125] Figure 11 This is a schematic diagram of the structure of an optical transmission device provided in an embodiment of this application;

[0126] Figure 12 This is a schematic diagram of another optical transmission device provided in an embodiment of this application;

[0127] Figure 13 This is a schematic diagram of another optical transmission device provided in an embodiment of this application. Detailed Implementation

[0128] In the description of this application, unless otherwise stated, "multiple" means two or more. At least one of the following or similar expressions refer to any combination of these terms, including any combination of single or plural terms. For example, at least one of a, b, and / or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0129] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0130] In the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0131] It is understood that the term "embodiment" used throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, throughout the specification, various embodiments do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0132] It is understood that some optional features in the embodiments of this application can be implemented independently in certain scenarios without relying on other features, such as the current solution on which they are based, to solve the corresponding technical problems and achieve the corresponding effects. Alternatively, they can be combined with other features as needed in certain scenarios. Correspondingly, the apparatus given in the embodiments of this application can also implement these features or functions, which will not be elaborated here.

[0133] In this application, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. In the various embodiments of this application, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. The following embodiments of this application do not constitute a limitation on the scope of protection of this application.

[0134] The following provides an exemplary description of the application scenarios of the embodiments of this application.

[0135] In optical transmission systems, optical interconnect technologies based on WDM combined with IMDD are typically used to achieve optical interconnection between data centers.

[0136] WDM refers to transmitting multiple wavelengths of optical signals in a single optical fiber to increase the fiber's transmission capacity. IMDD is used to convert digital signals into optical signals for transmission. At the transmitting end, IMDD carries the digital signal by modulating the intensity of the optical carrier. At the receiving end, IMDD directly uses a photodetector to detect changes in the intensity of the optical signal, thereby recovering the original digital signal.

[0137] The combination of WDM and IMDD involves multiplexing multiple optical signals of different wavelengths into the same optical fiber for transmission, utilizing intensity modulation and direct detection to achieve efficient data transmission. This combination of the high-capacity transmission capability of WDM and the simple and efficient detection method of IMDD significantly improves the performance of optical transmission systems, thereby meeting the demands of high-performance computing clusters such as artificial intelligence (AI) clusters for ultra-high bandwidth and long-distance transmission.

[0138] However, in the aforementioned optical transmission systems, signal distortion is likely to occur due to chromatic dispersion in the optical fiber, leading to a decrease in transmission performance. Furthermore, the signal distortion becomes more pronounced as the modulation rate, transmission distance, or link dispersion increases. Chromatic dispersion refers to the phenomenon where different wavelengths of optical signals in an optical fiber experience different propagation delays due to varying transmission rates.

[0139] To address the aforementioned transmission performance degradation, an optical transmission technology is needed that can mitigate the damage to high-speed signals under high dispersion.

[0140] Currently, the degradation of high-speed signals under high dispersion can be addressed by increasing the transmission power or the receiver sensitivity of the optical signal. Increasing the transmission power enhances the signal energy, thus partially offsetting signal attenuation caused by chromatic dispersion. Furthermore, increasing the receiver sensitivity improves its ability to detect weak signals, ensuring correct signal resolution even under conditions of high chromatic dispersion. However, increasing either the transmission power or the receiver sensitivity incurs a dispersion penalty. This additional transmission power or receiver sensitivity can be termed the dispersion penalty.

[0141] For example, in related technology one, taking an 800G FR4 optical module as an example, the transmission performance of the optical transmission system can be maintained by increasing the transmission power of the optical signal or increasing the receiving sensitivity of the optical signal. The 800G FR4 optical module is an optical module for high-speed Ethernet transmission, capable of supporting a transmission rate of 800Gbps, and can be used for long-distance transmission in data centers and high-performance networks.

[0142] However, on the one hand, the 800G FR4 optical module uses CWDM4 technology, in which the wavelengths of the transmitted optical signals are 1271nm, 1291nm, 1311nm, and 1331nm. It can be observed that the wavelength interval of 20nm is relatively large. A larger wavelength interval means a greater difference in transmission rate between optical signals of different wavelengths, resulting in a higher total dispersion. For example, in a 4km transmission scenario, the dispersion range may reach (-23.2, 13.2) picoseconds / nanometer (ps / nm), leading to a high dispersion cost that cannot meet link budget requirements. On the other hand, the 800G FR4 optical module uses a Mach-Zehnder modulator (MZM), an electroabsorption modulator laser (EML), or an electroabsorption modulator (EAM) as its modulator. The modulator may produce transient chirp (statistically, it is generally between 0 and 1), which can affect dispersion cost in some dispersion conditions. For example, transient chirp and dispersion of the same polarity will worsen dispersion cost, while transient chirp and dispersion of different polarities will alleviate dispersion cost. Simulation analysis shows that even in the combination of limiting dispersion and transient chirp, i.e., (-23.2ps / nm + chirp = 0) or (13.2ps / nm + chirp = 1), where chirp represents transient chirp, the dispersion cost is still relatively high, reaching 3dB, which still cannot meet the link budget requirements.

[0143] For example, in related technologies, taking the 800G LR4 optical module as an example, the total dispersion can be reduced by narrowing the wavelength spacing, thereby avoiding high dispersion costs. The 800G LR4 optical module is designed for longer-distance transmission, such as supporting a transmission distance of 10 kilometers. The 800G LR4 optical module can employ local area network wavelength division multiplexing (LAN WDM) technology based on Ethernet channels, where the wavelengths of the transmitted optical signals are 1295nm, 1300nm, 1304nm, and 1309nm. It can be seen that narrowing the wavelength spacing to 5nm can effectively reduce the total dispersion, thereby reducing dispersion costs. However, additional components such as thermoelectric coolers (TECs) are needed to precisely control the wavelength spacing, increasing the cost of the optical module.

[0144] In addition, other related technologies may employ dispersion compensation devices, such as dispersion-compensating fibers and chirped gratings, to reduce the total dispersion and thus lower the dispersion cost. However, these dispersion compensation devices are typically expensive, increasing the hardware cost of the optical module.

[0145] In summary, while addressing the degradation issues of high-speed signals under large dispersion, related technologies may result in excessive dispersion costs, failing to meet the transmission link budget requirements. Alternatively, they may necessitate the addition of new devices for precise wavelength spacing control or additional dispersion compensation components, increasing the cost of the optical module.

[0146] In view of this, embodiments of this application provide an optical transmission method that sets different first value ranges for the chirp parameters of modulators of different wavelengths. A first device then transmits an optical signal using a modulator whose chirp parameters are within the first value range, resulting in a dispersion cost lower than a preset threshold, effectively reducing the dispersion cost generated during optical transmission. Furthermore, embodiments of this application can also, after the first device transmits a first optical signal to a second device, the second device returns a second optical signal to the first device based on the first optical signal. The first device then adjusts the chirp parameters of its modulator according to the chirp reference information carried in the second optical signal. Thus, through the cooperation of the first and second devices, the adjustment of the chirp parameters can be indicated according to the actual transmission situation of the optical signal, achieving precise adjustment of the chirp parameters while reducing the dispersion cost.

[0147] The optical transmission method provided in this application can be applied to optical transmission systems, such as optical transmission systems based on data center interconnection, network device interconnection, or server interconnection. For example, the optical transmission method provided in this application can be applied to an optical transmission system for (0, 5) km transmission of 800Gbps services, such as an optical transmission system for 4 km transmission of 800Gbps services. As another example, the optical transmission method provided in this application can be applied to an optical transmission system for (0, 3) km transmission of 1.6TGbps services, such as an optical transmission system for 2 km transmission of 1.6TGbps services.

[0148] In some embodiments, the optical transmission method provided in this application can be applied to a WDM-IMDD optical transmission system, specifically in a WDM-IMDD optical module. Specifically, for each wavelength channel in the WDM-IMDD optical module, a modulator with a chirp parameter within a first value range is used to transmit the corresponding wavelength optical signal, thereby reducing dispersion cost. Thus, in addressing the impairment problem of high-speed signals under large dispersion, on the one hand, by limiting the chirp parameters of each modulator to the corresponding first value range, dispersion cost can be effectively reduced. On the other hand, dispersion cost reduction can be achieved without adding additional components, effectively controlling the cost of the optical module.

[0149] In this embodiment, the chirp parameter can be a transient chirp parameter. For example, referring to the following formula (1), the transient chirp parameter can be used to characterize the relationship between the phase change and the intensity change of the intensity-modulated optical signal.

[0150]

[0151] In the formula, α represents the phase of the optical signal; S represents the intensity of the optical signal; t represents the time variable; α represents the transient chirp parameter.

[0152] To facilitate understanding of the embodiments of this application, the following points will be explained before introducing the embodiments of this application.

[0153] 1. In the embodiments of this application, "instruction" can include direct instruction and indirect instruction, as well as explicit instruction and implicit instruction. The information indicated by a certain piece of information is called the information to be instructed. In specific implementation, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or its index. It can also indirectly indicate the information to be instructed by indicating other information, where there is a relationship between the other information and the information to be instructed. It can also indicate only a part of the information to be instructed, while the other parts of the information to be indicated are known or pre-agreed.

[0154] 2. In the embodiments of this application, the descriptions such as "in the case of", "if" and "if" all refer to the fact that the device (e.g., the first device or the second device) will make corresponding processing under certain objective circumstances. They are not time limits, nor do they require the device (e.g., the first device or the second device) to have a judgment action when implementing it, nor do they mean that there are other limitations.

[0155] Furthermore, the system architecture and business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0156] Furthermore, the actions, terms, etc., involved in the various embodiments of this application can be referenced interchangeably without limitation. The message names or parameter names in the messages exchanged between the various devices in the embodiments of this application are merely examples, and other names may be used in specific implementations without limitation.

[0157] The system architecture of the embodiments of this application will be described below as an example.

[0158] In some embodiments, the optical transmission method provided in this application can be applied to, for example... Figure 1 In the optical transmission system shown, exemplarily, Figure 1 This is a schematic diagram of the architecture of an optical transmission system provided in an embodiment of this application. See also... Figure 1 The optical transmission system includes: a first device 101 and a second device 102.

[0159] The first device 101 and the second device 102 can be network devices such as switches and routers, servers, or optical transmission devices such as optical transport network (OTN) devices.

[0160] In this embodiment, the first device 101 may be equipped with an optical module, such as a WDM-IMDD optical module. It is understood that the first device 101 has an optical module slot for adding optical modules. The optical module deployed in the first device 101 may include multiple modulators, such as... Figure 1 The optical modulators shown are 1, 2, 3, ..., n, where n is a positive integer. It is understood that different modulators transmit optical signals of different wavelengths. For example, optical modulator 1 can be used to transmit optical signals of wavelength 1, optical modulator 2 can be used to transmit optical signals of wavelength 2, optical modulator 3 can be used to transmit optical signals of wavelength 3, ..., optical modulator n can be used to transmit optical signals of wavelength n.

[0161] In some embodiments of this application, the initial chirp parameters of each modulator are within a first value range corresponding to each modulator. The dispersion cost of transmitting optical signals using chirp parameters within the first value range is lower than a preset threshold. The first value range of the chirp parameters differs for modulators of different wavelengths. For example, the configuration values ​​of the initial chirp parameters of each modulator can be constrained within the first value range before the optical module is put into service. It is understood that "before the optical module is put into service" can refer to the stage before the optical module is actually deployed to the first device. Alternatively, the configuration values ​​of the initial chirp parameters of each modulator can also be constrained within the first value range after the optical module is put into service. It is understood that "after the optical module is put into service" can refer to the stage after the optical module is actually deployed to the first device.

[0162] In other embodiments of this application, the chirp parameters of the modulator within the first device 101 are adjusted by the cooperation of the first device 101 and the second device 102. The corresponding process includes: the first device 101 sending a first optical signal to the second device 102; the second device 102 receiving the first optical signal sent by the first device 101; the second device 102 sending a second optical signal to the first device 101 based on the first optical signal; the first device 101 receiving the second optical signal sent by the second device 102; and the first device 101 adjusting the chirp parameters of the modulator based on the second optical signal. It is understood that the first optical signal includes optical signals of multiple wavelengths, such as optical signals of n wavelengths.

[0163] See Figure 1 The first device 101 also includes a wavelength division multiplexer (WDM). The WDM is used to multiplex optical signals of multiple wavelengths within the same optical fiber. The first optical signal may include optical signals of multiple wavelengths. When the first device 101 sends the first optical signal to the second device 102, multiple modulators can be used to convert the corresponding electrical signals into optical signals, obtaining optical signals of multiple wavelengths. The WDM is then used to combine the multiple wavelength optical signals before transmitting them through the optical fiber.

[0164] See Figure 1 The second device 102 includes a demultiplexer, multiple signal receiving units, an information acquisition unit, and an information feedback unit.

[0165] Among them, the demultiplexer is used to separate the optical signal after wavelength division multiplexing into multiple optical signals of different wavelengths.

[0166] The signal receiving unit is used to receive optical signals of corresponding wavelengths. For example, signal receiving unit 1 can be used to receive optical signals of wavelength 1, signal receiving unit 2 can be used to receive optical signals of wavelength 2, signal receiving unit 3 can be used to receive optical signals of wavelength 3, ..., signal receiving unit n can be used to receive optical signals of wavelength n.

[0167] The information acquisition unit is used to acquire chirp reference information based on the actual transmission of optical signals of multiple wavelengths. The chirp reference information is auxiliary information related to adjusting the chirp parameters of the modulator in the first device, such as the wavelength number of the modulator mentioned in the embodiments of this application, whether the chirp parameters are adjusted, the second value of the chirp parameters, the polarity of the chirp parameters, the second value range of the chirp parameters, the time delay of the first optical signal transmission to the second device, or the dispersion value corresponding to the modulator to be adjusted.

[0168] The information feedback unit is used to send a second optical signal to the first device 101, the second optical signal carrying chirp reference information. Exemplarily, the second optical signal can be sent to the first device 101 along a feedback channel via the information feedback unit. Figure 1 The feedback channel shown can be a newly added low-speed control channel on the service channel, used to realize information exchange between the second device and the first device.

[0169] When the second device 102 receives the first optical signal sent by the first device 101, it can use a dewavelength division multiplexer to separate the optical signals of multiple wavelengths and then transmit them to different signal receiving units respectively. Furthermore, the second device 102 obtains chirp reference information through the information acquisition unit and sends a second optical signal carrying the chirp reference information to the first device 101 along the feedback channel through the information feedback unit.

[0170] In this embodiment, a first device 101 is used as the optical signal transmitter (e.g., a transmitter), and a second device 102 is used as the optical signal receiver (e.g., a receiver) to illustrate the scheme. It is worth noting that the transmitter and receiver mentioned in this embodiment are relative terms and can interchange roles in different communication stages or scenarios. For example, in a two-way communication system, each device can act as both a transmitter and a receiver.

[0171] Figure 2 This is a schematic diagram of the hardware structure of an optical module provided in an embodiment of this application. See also... Figure 2 The optical module includes a processor 201, a modulator 202, and an interface 203.

[0172] The processor 201 acquires the data to be transmitted, performs symbol mapping on the data to obtain a symbol stream to be transmitted, and transmits the symbol stream to the modulator 202. The modulator 202 performs signal processing such as electro-optic conversion on the symbol stream to obtain an optical signal. The interface 203 is used to transmit the optical signal. In this embodiment, the interface 203 may specifically refer to an optical interface.

[0173] In this embodiment, the number of modulators 202 can be multiple, used to transmit optical signals of different wavelengths. In this embodiment, different modulators correspond to different wavelengths of optical signals, and the first value range of the chirp parameter corresponding to different wavelength modulators is different. The dispersion cost generated by transmitting optical signals using chirp parameters within the first value range is lower than a preset threshold. Thus, using the optical module provided in this embodiment to transmit optical signals results in a dispersion cost lower than the preset threshold, effectively reducing the dispersion cost generated during optical transmission.

[0174] In this embodiment of the application, the processor 201 is also used to perform a configuration process for the chirp parameters of multiple modulators.

[0175] In some embodiments, interface 203 may be a transceiver or an input / output interface. Interface 203 is used to receive signals from other devices and transmit them to processor 201 or to send signals from processor 201 to other devices.

[0176] In some embodiments, the optical module may further include a memory 204, wherein the memory 204 is used to store program instructions and / or data, such as the mapping relationship between bias voltage and chirp parameters mentioned in the embodiments of this application.

[0177] Understandably, the modulator 202, as the transmitting device of the optical module, is used to convert electrical signals into optical signals and transmit them through optical fibers. Typically, the optical module also includes a receiving device for receiving optical signals and converting them back into electrical signals.

[0178] The types of optical modules in this application include, but are not limited to, ordinary optical modules, near-package optics (NPO) modules, and co-packaged optics (CPO) modules. Ordinary optical modules can perform functions including, but not limited to, digital signal processing and clock data recovery (CDR). For example, an ordinary optical module converts analog signals to digital signals, performs digital signal processing on the digital signals, and then converts them back to analog signals for transmission. Because digital signal processing requires retiming, an ordinary optical module can also be called a retimed module. NPO modules and CPO modules can also be called optical engines. NPO technology or CPO technology is a technology that "packages" the host-side device (or host-side chip) and the optical engine. When NPO technology is used to package the host-side device and the optical engine, the optical engine can be called an NPO module. When CPO technology is used to package the host-side device and the optical engine, the optical engine can be called a CPO module.

[0179] In one example of this application, a schematic diagram of the hardware structure of the first device or the second device is shown below. Figure 3 As shown. Figure 3 This is a schematic diagram of the hardware structure of a communication device provided in an embodiment of this application. See also... Figure 3 The communication device includes a host-side device 301 and an optical module 302. The host-side device 301 sends data to the optical module 302, and the optical module 302 generates an optical signal based on the data sent by the host-side device 301 and transmits the optical signal through the channel. For example, the host-side device may be a router, switch, server, or optical transport network equipment.

[0180] The host-side device 301 may include a processor, a memory, a communication module, and a bus. The processor, memory, and communication module can be connected via the bus.

[0181] The processor is the control center of the host-side device 301, and can be a general-purpose central processing unit (CPU) or other general-purpose processors. The general-purpose processor can be a microprocessor or any conventional processor. In this embodiment, the chirp parameters can be adjusted using the processor in the host-side device 301.

[0182] The memory may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, electrically erasable programmable read-only memory (EEPROM), disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

[0183] In one possible implementation, the memory can exist independently of the processor. The memory can be connected to the processor via a bus and used to store data, instructions, or program code. In another possible implementation, the memory can be integrated with the processor.

[0184] The communication module is used for the host-side device 301 to connect with other devices via a communication network, which can be Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. The communication module may include a receiving unit for receiving data and a transmitting unit for sending data.

[0185] A bus can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc.

[0186] It should be pointed out that, Figure 3 The structure shown does not constitute a limitation on the communication device, except Figure 3 In addition to the components shown, the communication device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0187] For ease of understanding, the optical transmission method provided in the embodiments of this application will be described exemplarily below with reference to the above system architecture and accompanying drawings.

[0188] It is understood that in the embodiments of this application, the first device or the second device may perform some or all of the steps in the embodiments of this application. These steps or operations are only examples. The embodiments of this application may also perform other operations or variations of various operations.

[0189] Figure 4 This is a flowchart illustrating an optical transmission method provided in an embodiment of this application. In some possible implementations, this optical transmission method can be executed by a first device in the above system architecture, see [link to relevant documentation]. Figure 4 Taking the first device as the executing entity as an example, the method includes the following S401 to S402.

[0190] S401, The first device acquires the data to be transmitted.

[0191] S402. The first device uses multiple modulators to transmit data in the form of optical signals.

[0192] In this embodiment, different modulators correspond to optical signals of different wavelengths, and the first value range of the chirp parameter corresponding to different wavelength modulators is different. It is understood that different modulators modulate optical signals of different wavelengths, and correspondingly, the first value range corresponding to different wavelength modulators is different.

[0193] The dispersion cost generated by transmitting optical signals using chirp parameters within the first value range is lower than a preset threshold, which can effectively reduce the dispersion cost. The preset threshold is a pre-defined dispersion cost threshold, such as 1.5 dB, 1 dB, or other thresholds.

[0194] For example, in a CWDM4-based optical transmission system with a transmission rate of 800Gbps and a transmission distance of up to 5km, the first value range of the chirp parameter for a modulator with a wavelength of 1271nm is (0.1, 1); the first value range of the chirp parameter for a modulator with a wavelength of 1291nm is (-0.2, 1); the first value range of the chirp parameter for a modulator with a wavelength of 1311nm is (-1, 1); and the first value range of the chirp parameter for a modulator with a wavelength of 1331nm is (-1, 0.4). Thus, for an 800Gbps optical transmission system, a first value range of chirp parameters corresponding to modulators of different wavelengths is provided, thereby effectively reducing the dispersion cost generated during optical transmission in an 800Gbps optical transmission system.

[0195] For example, in a CWDM4-based optical transmission system with a transmission rate of 1.6Tbps and a transmission distance of up to 3km, the first value range of the chirp parameter for a modulator with a wavelength of 1271nm is (0.7, 1); the first value range of the chirp parameter for a modulator with a wavelength of 1291nm is (0.3, 1); the first value range of the chirp parameter for a modulator with a wavelength of 1311nm is (-1, 1); and the first value range of the chirp parameter for a modulator with a wavelength of 1331nm is (-1, -0.3). Thus, for a 1.6Tbps optical transmission system, a first value range of chirp parameters corresponding to modulators of different wavelengths is provided, thereby effectively reducing the dispersion cost generated during optical transmission in a 1.6Tbps optical transmission system.

[0196] It is worth noting that in an 800Gbps optical transmission system or a 1.6Tbps optical transmission system, for the four types of modulators with wavelengths of 1271nm, 1291nm, 1311nm, and 1331nm, the chirp parameters of any two or more modulators can be selectively configured so that the chirp parameters of the selected modulators are within the corresponding first value range.

[0197] The technical solution provided in this application sets different first value ranges for the chirp parameters of modulators of different wavelengths. Then, the first device transmits optical signals by using a modulator with chirp parameters within the first value range, so that the resulting dispersion cost is lower than a preset threshold, which can effectively reduce the dispersion cost generated during optical transmission.

[0198] It is understandable that the process of obtaining the first value range can be performed by the first device or other devices with computing capabilities before implementing this scheme. The process of obtaining the first value range is described below. For each modulator, the following steps (1-1) to (1-3) can be used to obtain the first value range corresponding to that modulator.

[0199] Step (1-1): Determine the dispersion range of the modulator based on the wavelength range corresponding to the modulator and the preset transmission distance.

[0200] The wavelength range corresponding to the modulator refers to the upper and lower bounds of the wavelength of the optical signal transmitted by the modulator. The preset transmission distance refers to the maximum transmission distance of the optical fiber channel (such as the G652 optical fiber channel) in the optical transmission system in which the modulator is applied.

[0201] In some embodiments, the wavelength range corresponding to the modulator and the preset transmission distance can be obtained based on the fiber optic channel parameter specifications of the current optical transmission system. These fiber optic channel parameter specifications include parameters of fiber optic channels defined by standards, such as those defined by the Institute of Electrical and Electronics Engineers (IEEE) standards, including the wavelength range of different laser channels, the dispersion parameter model used, and the maximum transmission distance.

[0202] In some embodiments, the dispersion range corresponding to the modulator is determined based on the wavelength range corresponding to the modulator, the preset transmission distance and the following formula (2).

[0203]

[0204] In the formula, D max D represents the upper bound of the total dispersion corresponding to the modulator; min This represents the lower bound of the total dispersion corresponding to the modulator; (D min D max That is, the dispersion range corresponding to the modulator; λ max λ represents the upper bound of the wavelength of the optical signal transmitted by the modulator. min L represents the lower bound of the wavelength of the optical signal transmitted by the modulator. maxD represents the maximum transmission distance of the optical fiber channel in the current optical transmission system. max (λ max The function ) is used to calculate the dispersion at wavelength λ for the type of optical fiber used in the current optical transmission system. max The upper bound below; D min (λ min The function ) is used to calculate the dispersion at wavelength λ for the type of optical fiber used in the current optical transmission system. min The lower bound.

[0205] Step (1-2): Based on the optical transmission simulation results, determine the first candidate value.

[0206] The first candidate value is a candidate value whose dispersion cost is lower than a preset threshold and falls within the dispersion range corresponding to the modulator. In some embodiments, the first candidate value is determined based on optical transmission simulation results. The optical transmission simulation results are used to characterize the result of simulating optical signal transmission based on multiple candidate values ​​to obtain the dispersion cost corresponding to each candidate value.

[0207] In some embodiments, the optical transmission simulation result can be the result of simulating optical signal transmission at a preset transmission rate to obtain the dispersion cost of multiple candidate values ​​of the chirp parameter. Here, the preset transmission rate refers to the single-wavelength rate of the current optical transmission system. Exemplarily, the optical transmission simulation result can be obtained based on system simulation, system experiments, or system analysis. Then, under the condition of the dispersion range corresponding to the modulator, the chirp parameter with different candidate values ​​is scanned, and a candidate value of the chirp parameter with a dispersion cost lower than a preset threshold and within that dispersion range is selected, i.e., the first candidate value is obtained.

[0208] For example, Figure 5 This is a schematic diagram illustrating an optical transmission simulation result provided in an embodiment of this application. See also... Figure 5Taking the simulation results of an optical transmission system based on CWDM4 with a transmission rate of 800Gbps and a transmission distance of 5km as an example, the trend of dispersion cost corresponding to four candidate values ​​of chirp parameter 0, 0.1, 0.4, and 0.8 is shown. Among them, the horizontal axis represents the dispersion range (unit: ps / nm), and the vertical axis represents the dispersion cost (unit: dB). Based on the above formula (2), the dispersion range corresponding to the modulator in the optical transmission system can be calculated as (-23.2, 13.2). Taking the preset threshold of dispersion cost as 1.5 as an example, candidate values ​​of chirp parameter with dispersion cost lower than 1.5 are selected within the dispersion range (-23.2, 13.2). It can be found that for the left boundary of the dispersion range (i.e., -23.2), the candidate values ​​of chirp parameter with dispersion cost lower than 1.5 are 0.1, 0.4, and 0.8. For the right boundary of the dispersion range (i.e., 13.2), the candidate values ​​for the chirp parameter with a dispersion cost less than 1.5 are 0, 0.1, and 0.4. Therefore, the first candidate values ​​can be determined to be 0.1 and 0.4.

[0209] Steps (1-3): Determine the first value range based on the first candidate value.

[0210] For example, taking the simulation results of an optical transmission system based on CWDM4 with a transmission rate of 800Gbps and a transmission distance of (0, 5)km as an example, after determining the first candidate values ​​of 0.1 and 0.4, it is necessary to limit the first value range of the chirp parameter of the modulator with a wavelength of 1271nm to above 0.1, and the first value range of the chirp parameter of the modulator with a wavelength of 1331nm to below 0.4. In this way, by constraining the chirp parameter of the modulator within the aforementioned first value range, the dispersion cost of the optical transmission system is significantly reduced.

[0211] For example, taking an optical transmission system based on CWDM4 with a transmission rate of 1.6Tbps and a transmission distance of (0,3)km as an example, after determining the first candidate values ​​as -0.3, 0, 0.3 and 0.7, it is necessary to limit the chirp parameter of the modulator with a wavelength of 1271nm to above 0.7, the chirp parameter of the modulator with a wavelength of 1291nm to above 0.3, the chirp parameter of the modulator with a wavelength of 1311nm to around 0, and the chirp parameter of the modulator with a wavelength of 1331nm to below -0.3.

[0212] It is understandable that steps (1-1) to (1-3) above describe the process of determining the first value range of a modulator. Different modulators transmit optical signals of different wavelengths. Therefore, for modulators of different wavelengths, the first value range corresponding to the modulator can be obtained based on steps (1-1) to (1-3) above.

[0213] In the above embodiments, a method for determining a first value range is provided, which can quickly and efficiently determine the first value range corresponding to different modulators. Furthermore, by using the first value range corresponding to different modulators, the value range of the chirp parameter of different modulators is constrained, so that when a modulator with a chirp parameter within the first value range is used to transmit optical signals, the resulting dispersion cost is lower than a preset threshold, effectively reducing the dispersion cost generated during optical transmission.

[0214] In this embodiment, the chirp parameters of each modulator can be constrained so that the values ​​of the chirp parameters are within the first value range corresponding to each modulator, thereby alleviating dispersion damage and improving dispersion tolerance.

[0215] For modulators that support chirp parameter configuration (such as MZM), after obtaining the first value range corresponding to each modulator based on the above steps (1-1) to (1-3), the chirp parameter of each modulator can be configured based on the first value range corresponding to each modulator.

[0216] For example, configuration can be performed before or after the modulator leaves the factory. This application does not limit this. It is understood that when configuring before the modulator leaves the factory, the processor of the optical module can be used to execute the chirp parameter configuration process. When configuring after the modulator leaves the factory, the processor of the optical module or the processor of the first device can be used to execute the chirp parameter configuration process. This application uses the first device as the execution subject as an example to illustrate the solution. Furthermore, in the case of configuring after the modulator leaves the factory, it is necessary to determine whether the default value at the time of modulator leaving the factory is within the first value range. If the default value at the time of modulator leaving the factory is within the first value range, then the configuration process after the modulator leaves the factory does not need to be executed; if the default value at the time of modulator leaving the factory is not within the first value range, then the configuration process after the modulator leaves the factory needs to be executed.

[0217] In some embodiments, for each modulator, the first device may configure the chirp parameter of the modulator based on a first value range corresponding to the modulator.

[0218] For example, the chirp parameter of the modulator is configured to a first value. The first value is within a first value range corresponding to the modulator.

[0219] The process of configuring the chirp parameter of the modulator to the first value can be completed by using any one of the following configuration methods one to three.

[0220] Configuration Method 1: Chirp parameter configuration is achieved by configuring the unequal splitting ratio of the beam splitter.

[0221] The modulator may include a beam splitter to divide the optical signal into two or more parts for transmission. The unequal splitting ratio is a parameter introduced by the beam splitter, used to distribute the input optical signal to different output ports in unequal proportions. In this embodiment, the chirp parameter can be configured through the unequal splitting ratio introduced by the beam splitter.

[0222] In some embodiments, the first device determines a first splitting ratio based on a first value, configuring the unequal splitting ratio of the beam splitter as the first splitting ratio. The first splitting ratio refers to the unequal splitting ratio determined based on the first value.

[0223] In this embodiment, the chirp parameter is related to the unequal splitting ratio of the modulator, specifically to the deviation value of the unequal splitting ratio.

[0224] For example, Figure 6 This is a schematic diagram of a modulator provided in an embodiment of this application. See also... Figure 6 The modulator includes a laser (light amplification by stimulated emission of radiation) and a beam splitter. See also Figure 6 The beam splitter can introduce an unequal splitting ratio of 0.5 + Δ: 0.5 - Δ, meaning the optical signal transmitted from the laser to the splitter is distributed in a ratio of 0.5 + Δ: 0.5 - Δ, with one output port receiving 0.5 + Δ optical power and the other receiving 0.5 - Δ optical power. Here, Δ represents the deviation value of the unequal splitting ratio. Furthermore, radio frequency signals can be applied to the two optical transmission paths of the modulator, such as... Figure 6 The pair of differential signals with equal amplitude shown are s(t) and -s(t).

[0225] In some embodiments, the absolute value of the chirp parameter is equal to four times the deviation value of the unequal splitting ratio. Accordingly, the deviation value of the unequal splitting ratio can be determined based on the first value and the following formula (3).

[0226]

[0227] In the formula, Δ represents the deviation value of the unequal splitting ratio; α represents the chirp parameter, such as the transient chirp parameter.

[0228] Thus, based on the relationship between the absolute value of the chirp parameter and the deviation value of the unequal spectral ratio in the above formula (3), the deviation value of the unequal spectral ratio corresponding to the first value can be determined. Furthermore, based on the deviation value of the unequal spectral ratio and 0.5+Δ:0.5-Δ, the first spectral ratio can be determined.

[0229] For example, taking the absolute value of the chirp parameter as 0.4, the deviation value of the unequal splitting ratio Δ = 0.1 can be calculated based on the above formula (3). Then, based on the deviation value of the unequal splitting ratio Δ = 0.1 and 0.5 + Δ: 0.5 - Δ, the first splitting ratio can be determined to be 0.6: 0.4.

[0230] In the above configuration method one, a method for configuring the absolute value of the chirp parameter is provided. Specifically, the absolute value of the chirp parameter can be configured by adjusting the unequal splitting ratio of the modulator.

[0231] Configuration Method 2: Chirp parameter configuration is achieved by configuring the voltage amplitude value of the radio frequency signal.

[0232] In this modulator, radio frequency (RF) signals can be applied to the two optical transmission paths to modulate the optical signals, such as phase modulation or amplitude modulation. In this embodiment, the chirp parameters can be configured using RF signals on the two optical transmission paths.

[0233] In some embodiments, the first device determines a first amplitude value based on a first value, and configures the voltage amplitude value of the radio frequency signal as the first amplitude value. The first amplitude value refers to the voltage amplitude value determined based on the first value.

[0234] In this embodiment, the chirp parameter is related to the voltage amplitude of the modulator's radio frequency signal, specifically to the deviation between the voltage amplitude values ​​of the radio frequency signals applied on the two optical transmission paths (i.e., the upper and lower arms of the modulator).

[0235] For example, Figure 7 A schematic diagram of another modulator provided in an embodiment of this application. See also... Figure 7 The modulator includes a laser and a beam splitter. See also Figure 7 The beam splitter introduces an unequal beam splitting ratio of 0.5:0.5 (i.e., 1:1), meaning the optical signal transmitted from the laser to the beam splitter is distributed in a 0.5:0.5 ratio, with one output port receiving 0.5 of the optical power and the other output port receiving 0.5 of the optical power. Furthermore, radio frequency (RF) signals, (1+Δ)s(t) and -(1-Δ)s(t), are applied to the two optical transmission paths of the modulator. Here, (1+Δ) and -(1-Δ) represent the voltage amplitude values ​​of the RF signals, with Δ representing the deviation of the voltage amplitude value.

[0236] In some embodiments, the absolute value of the chirp parameter is equal to the deviation of the voltage amplitude value. Accordingly, the deviation of the voltage amplitude value can be determined based on the first value and the following formula (4).

[0237] Δ=|α| (4)

[0238] In the formula, Δ represents the deviation of the voltage amplitude value; α represents the chirp parameter, such as the transient chirp parameter.

[0239] Thus, based on the relationship between the absolute value of the chirp parameter and the deviation value of the voltage amplitude in the above formula (4), the deviation value of the voltage amplitude corresponding to the first value can be determined. Furthermore, the first amplitude value can be determined based on the deviation value of the voltage amplitude and (1+Δ) and -(1-Δ). Here, the first amplitude value refers to the voltage amplitude value determined based on the first value.

[0240] For example, taking the absolute value of the chirp parameter as 0.1, the deviation value of the voltage amplitude Δ = 0.1 can be calculated based on the above formula (4). Then, based on the deviation value of the voltage amplitude Δ = 0.1 and (1+Δ) and -(1-Δ), the first amplitude value can be determined to be 1.1 and -0.9.

[0241] In the second configuration method described above, a method for configuring the absolute value of the chirp parameter is provided. Specifically, the absolute value of the chirp parameter can be configured by adjusting the voltage amplitude of the modulator's radio frequency signal.

[0242] Configuration method three: Chirp parameter configuration is achieved by configuring the unequal splitting ratio of the splitter and the voltage amplitude value of the radio frequency signal.

[0243] In some embodiments, the first device determines a first splitting ratio and a first amplitude value based on a first value, configures the unequal splitting ratio of the splitter as the first splitting ratio, and configures the voltage amplitude value of the radio frequency signal as the first amplitude value.

[0244] In this embodiment, the chirp parameter is related to the unequal splitting ratio of the beam splitter and the voltage amplitude of the radio frequency signal, specifically the deviation of the unequal splitting ratio and the deviation of the voltage amplitude between the radio frequency signals on the two optical transmission paths.

[0245] For example, Figure 8 A schematic diagram of another modulator provided in an embodiment of this application. See also... Figure 8 The modulator includes a laser and a beam splitter. See also Figure 8 The beam splitter introduces an unequal beam splitting ratio of 0.5 + Δ1 : 0.5 - Δ1, meaning the optical signal transmitted from the laser to the beam splitter is distributed according to a ratio of 0.5 + Δ1 : 0.5 - Δ1. One output port receives 0.5 + Δ1 of the optical power, and the other output port receives 0.5 - Δ1 of the optical power. Here, Δ1 represents the deviation of the beam splitting ratio. Furthermore, radio frequency signals (1 + Δ2)s(t) and -(1 - Δ2)s(t) are applied to the two optical transmission paths of the modulator. Here, Δ2 represents the deviation of the voltage amplitude.

[0246] In some embodiments, the absolute value of the chirp parameter is equal to four times the deviation of the splitting ratio and the sum of the deviation of the voltage amplitude. Accordingly, the deviation of the splitting ratio and the deviation of the voltage amplitude can be determined based on the first value and the following formula (5).

[0247] |α|=4Δ1+Δ2 (5)

[0248] In the formula, Δ1 represents the deviation value of the unequal splitting ratio; Δ2 represents the deviation value of the voltage amplitude; and α represents the chirp parameter, such as the transient chirp parameter.

[0249] Thus, based on the relationship between the absolute value of the chirp parameter in formula (5) and the deviation values ​​of the unequal splitting ratio and voltage amplitude, the deviation values ​​of the unequal splitting ratio and voltage amplitude corresponding to the first value can be determined. Furthermore, the first splitting ratio can be determined based on the deviation value of the splitting ratio and 0.5 + Δ1: 0.5 - Δ1. The first amplitude value can be determined based on the deviation value of the voltage amplitude and (1 + Δ2) and -(1 - Δ2).

[0250] For example, taking a chirp parameter with an absolute value of 0.5 as an example, the appropriate deviation values ​​Δ1 and Δ2 of the unequal splitting ratio and voltage amplitude can be selected using the above formula (5), such as Δ1 = 0.1 and Δ2 = 0.1. Furthermore, based on the deviation values ​​Δ1 = 0.1 and 0.5 + Δ1 : 0.5 - Δ1, the first splitting ratio can be determined to be 0.6 : 0.4. Based on the deviation values ​​Δ2 = 0.1 and (1 + Δ2) and -(1 - Δ2), the first amplitude values ​​can be determined to be 1.1 and -0.9.

[0251] In the above configuration method three, a method for configuring the absolute value of the chirp parameter is provided. This method introduces unequal splitting ratios and the amplitude difference of unbalanced radio frequency signals. By configuring the unequal splitting ratio of the modulator and the voltage amplitude of the radio frequency signal, the absolute value of the chirp parameter can be configured.

[0252] The above configuration methods one through three describe the process of configuring the absolute value of the chirp parameter. In some other embodiments, the first device also needs to configure the polarity of the chirp parameter. The polarity of the chirp parameter is configured by configuring the voltage range of the bias voltage.

[0253] The bias voltage is used to set the modulator's operating point (or bias point) at a specific location to achieve the desired modulation function. The polarity of the chirp parameter is related to the voltage range of the modulator's bias voltage. When the voltage range is configured in the first range, the intensity of the output optical signal is negatively correlated with the voltage of the applied radio frequency signal, making the chirp parameter positive. When the voltage range is configured in the second range, the intensity of the output optical signal is positively correlated with the voltage of the applied radio frequency signal, making the chirp parameter negative.

[0254] Accordingly, the configuration process for the chirp parameter may include: based on the polarity of the chirp parameter indicated by the first value, configuring the voltage range of the bias voltage to a first range when a positive polarity chirp parameter is required, and configuring the voltage range of the bias voltage to a second range when a negative polarity chirp parameter is required.

[0255] Taking an MZM modulator as an example, the bias voltage range can be adjusted by the bias point (or operating point) of the MZM. For instance, the bias voltage range can be configured to the first range by setting the modulator's bias point to a position corresponding to the first range. Similarly, the bias voltage range can be configured to the second range by setting the modulator's bias point to a position corresponding to the second range. It is understood that the position of the bias point affects the relationship between the intensity of the output optical signal and the voltage of the applied radio frequency signal. For example, a positive chirp may occur when the intensity of the output optical signal is negatively correlated with the voltage of the applied radio frequency signal. Conversely, a negative chirp may occur when the intensity of the output optical signal is positively correlated with the voltage of the applied radio frequency signal.

[0256] It is worth noting that the above embodiments use a modulator that supports chirp parameter configuration (such as MZM) as an example to illustrate the chirp parameter configuration process. In other embodiments, for modulators that do not support chirp parameter configuration (such as EML), after obtaining the first value range corresponding to each modulator based on steps (1-1) to (1-3) above, a modulator whose chirp parameter falls within the corresponding first value range can be selected from multiple candidate modulators based on the first value range corresponding to each modulator. Then, the selected modulator is used to perform the subsequent optical signal transmission process.

[0257] In this embodiment, the deviation between the first values ​​configured for the chirp parameters of multiple modulators is lower than a preset deviation value. The preset deviation value refers to a pre-set deviation value, such as 0.2 or 0.3. This means that the first values ​​configured for the chirp parameters of multiple modulators are similar. Thus, when faced with selecting the values ​​of chirp parameters for different modulators, the principle of making the values ​​of the chirp parameters of multiple modulators similar can be used to select the corresponding first value. This reduces the differences in chirp parameters between different modulators, making the chirp parameters of different modulators more consistent, thereby reducing the complexity between the chirp parameters of different modulators and making the management of the chirp parameters of different modulators easier.

[0258] For example, in a CWDM4-based optical transmission system with a transmission rate of 800Gbps and a transmission distance of up to 5km, the chirp parameters of multiple modulators are configured with a first value within the range of (0.1, 0.4). By constraining the configuration values ​​of the chirp parameters of multiple modulators to the range of (0.1, 0.4), the values ​​of the chirp parameters of multiple modulators are made similar, reducing the differences in chirp parameters between different modulators, making the chirp parameters of different modulators more consistent, thereby reducing the complexity between the chirp parameters of different modulators and making the management of the chirp parameters of different modulators easier.

[0259] It is worth noting that if the dispersion range corresponding to the modulator is too large, it may be impossible to determine the first value range (such as an empty set), thus making it impossible to configure the chirp parameter. Alternatively, if the range of the first value is too large, it may cause the chirp parameter value to be too large or too small, exceeding the adjustable range of the chirp parameter and making it impossible to configure the chirp parameter. In this case, furthermore, in scenarios where optical signals are transmitted between the first device and other devices, the chirp parameter of the modulator of the first device can be adjusted based on the actual transmission conditions.

[0260] The following is based on Figure 9 The adjustment process in optical signal transmission scenarios is explained. Figure 9 This is a schematic flowchart illustrating another optical transmission method provided in an embodiment of this application. In some possible implementations, this optical transmission method can be implemented by the cooperation of the first device and the second device in the above system architecture, see [link to relevant documentation]. Figure 9 Taking the interaction process between the first device and the second device as an example, the method includes the following S901 to S905.

[0261] S901, The first device sends a first optical signal to the second device.

[0262] Here, the first optical signal refers to the optical signal sent from the first device to the second device. It is understood that when the first device transmits optical signals based on multiple modulators, wherein different modulators modulate optical signals of different wavelengths, the first optical signal may include optical signals of multiple wavelengths.

[0263] S902, The second device receives the first optical signal sent by the first device.

[0264] S903. The second device sends a second optical signal to the first device based on the first optical signal.

[0265] The second optical signal is used to indicate the adjustment of the chirp parameters of the modulator of the first device.

[0266] In this embodiment, the second device can feed back a second optical signal carrying chirp reference information to the first device based on the actual transmission status of the first optical signal. The chirp reference information is auxiliary information related to adjusting the chirp parameters of the modulator in the first device, allowing the first device to perform the chirp parameter adjustment process based on the chirp reference information. The chirp reference information may include any one of the following: a second value of the chirp parameter, a second value range of the chirp parameter, the time delay of the first optical signal transmission to the second device, or the dispersion value corresponding to the modulator to be adjusted. Further, the chirp reference information also includes the wavelength number of the modulator, whether the chirp parameter is being adjusted, and the polarity of the chirp parameter, etc.

[0267] In some embodiments, the chirp reference information includes a second value corresponding to the modulator to be adjusted. The dispersion cost of transmitting an optical signal using the chirp parameter with the second value is lower than a preset threshold.

[0268] In the case where the second optical signal carries the second value corresponding to the modulator to be adjusted, the second device needs to first determine the second value range corresponding to the modulator to be adjusted, determine the second value from the second value range, and then add the second value corresponding to the modulator to be adjusted to the second optical signal.

[0269] In this embodiment, by carrying a second value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator of the first device based on the second value.

[0270] In some other embodiments, the chirp reference information includes a second range of values ​​corresponding to the modulator to be regulated.

[0271] In the case where the second optical signal carries the second value range corresponding to the modulator to be adjusted, the second device needs to first determine the second value range corresponding to the modulator to be adjusted, and then add the second value range corresponding to the modulator to be adjusted to the second optical signal.

[0272] In this embodiment, by carrying a second value range corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator of the first device based on the second value range.

[0273] In other embodiments, the chirp reference information includes the time delay of the first optical signal being transmitted to the second device. The first optical signal may include optical signals of multiple wavelengths. That is, the chirp reference information may include the time delay of the transmission of optical signals of multiple wavelengths to the second device respectively.

[0274] In response to the aforementioned situation where the second optical signal carries the first optical signal to the second device, the second device needs to measure the time delay of the first optical signal to the second device and then add the measured time delay to the second optical signal.

[0275] In this embodiment, the first device adjusts the chirp parameter of its modulator based on the time delay of transmitting multiple wavelengths of optical signals to the second device by carrying multiple wavelengths of optical signals in the second optical signal.

[0276] In other embodiments, the chirp reference information includes the dispersion value corresponding to the modulator to be regulated.

[0277] In the case where the second optical signal carries the dispersion value corresponding to the modulator to be adjusted, the second device needs to determine the dispersion value corresponding to the modulator and then add the dispersion value corresponding to the modulator to the second optical signal.

[0278] In this embodiment, by carrying the dispersion value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the dispersion value corresponding to the modulator to be adjusted.

[0279] The process of determining the second value range corresponding to the modulator is explained below. For each modulator, the second value range corresponding to the modulator can be obtained by using the following steps (2-1) to (2-6).

[0280] Step (2-1): The delay of the second device acquiring multiple wavelengths of optical signals and transmitting them to the second device.

[0281] The time delay of multiple wavelengths of optical signals being transmitted to the second device can be measured by the second device based on the actual transmission situation.

[0282] Regarding the situation where the second optical signal carries the delay of the first optical signal to the second device, after obtaining the delay of multiple wavelengths of optical signals to the second device based on step (2-1), a second optical signal carrying the delay of the first optical signal to the second device can be generated, so there is no need to execute subsequent steps (2-2) to (2-6).

[0283] Step (2-2): For every two wavelengths of optical signal, the second device determines the dispersion value corresponding to the average wavelength value based on the time delay and wavelength value of the two wavelengths of optical signal.

[0284] The wavelength value can be the center value of the wavelength channel where the optical signal resides, i.e., the center value between the upper and lower wavelength boundaries, or it can be any wavelength value of the wavelength channel where the optical signal resides, i.e., any value between the upper and lower wavelength boundaries. This application does not limit this. The average wavelength value is the average wavelength value of the two optical signals, i.e., the average value of the wavelength values ​​of the two optical signals.

[0285] In some embodiments, for each pair of optical signals, the dispersion value corresponding to the average wavelength value is determined based on the time delay of the two optical signals, the wavelength value of the two optical signals, and the following formula (6).

[0286] D((λ i +λ j ) / 2)=(τ(λ i )-τ(λ j )) / (λ i -λ j (6)

[0287] In the formula, λ i λ represents the wavelength of the optical signal i; j This represents the wavelength value of the optical signal j; (λ) i +λ j ) / 2 represents the average wavelength values ​​of optical signal i and optical signal j; τ(λ i ) represents the time delay of optical signal i; τ(λ) j ) represents the time delay of optical signal j; τ(λ) i )-τ(λ j The delay difference between two optical signals is represented by ). It's understandable that, assuming there are n wavelengths of optical signals, then it's possible to obtain... Average wavelength value and A combination of dispersion values. Among them, The combination formula refers to the number of combinations of choosing 2 elements from n elements.

[0288] Step (2-3): The second device fits multiple average wavelength values ​​with the corresponding dispersion values ​​to obtain the objective function relationship.

[0289] The objective function relationship is used to indicate the functional relationship between the dispersion value and the wavelength value.

[0290] In some embodiments, the second device performs least-squares fitting based on multiple average wavelength values ​​and the dispersion values ​​corresponding to the multiple average wavelength values ​​to obtain the objective function relationship.

[0291] In steps (2-1) to (2-3) above, a method is provided for the second device to obtain the target function relationship based on fitting. Furthermore, this target function relationship indicates the functional relationship between the dispersion value and the wavelength value, so that the dispersion value corresponding to different modulators can be determined based on the target function relationship, thereby determining the second value range corresponding to different modulators.

[0292] Step (2-4): The second device determines the dispersion value corresponding to the modulator based on the relationship between the wavelength value of the optical signal transmitted by the modulator and the target function.

[0293] In some embodiments, the second device substitutes the wavelength value of the optical signal transmitted by the modulator into the aforementioned objective function relationship to obtain the dispersion value corresponding to the modulator. It is understood that, since the objective function relationship is a fitted function indicating the relationship between the dispersion value and the wavelength value, the dispersion value corresponding to the modulator is an estimated value based on this fitted objective function relationship.

[0294] In the case where the second optical signal carries the dispersion value corresponding to the modulator to be adjusted, after obtaining the dispersion value corresponding to the modulator based on steps (2-1) to (2-4), a second optical signal carrying the dispersion value corresponding to the modulator can be generated, so there is no need to perform subsequent steps (2-5) to (2-6).

[0295] Step (2-5): The second device determines the second candidate value corresponding to the modulator based on the dispersion value corresponding to the modulator and the optical transmission simulation results.

[0296] The optical transmission simulation results are used to characterize the dispersion cost corresponding to multiple candidate values ​​obtained from the simulated transmission of optical signals based on multiple candidate values ​​of the chirp parameter. The second candidate value is the candidate value whose dispersion cost is lower than a preset threshold and corresponds to the dispersion value. It is understood that the second device can pre-store the optical transmission simulation results.

[0297] Step (2-6): The second device determines the second value range corresponding to the modulator based on the second candidate value corresponding to the modulator.

[0298] In some embodiments, the second device may obtain a preset range centered on the second candidate value as the second value range.

[0299] In steps (2-1) to (2-6) above, a method is provided for the second device to determine the second value range, which can quickly and efficiently determine the second value range corresponding to different modulators. Furthermore, by feeding back the second value range to the first device, the value range of the chirp parameter of the modulator of the first device is further constrained, and precise adjustment of the chirp parameter can be achieved.

[0300] Regarding the case where the second optical signal carries the second value corresponding to the modulator to be adjusted, after obtaining the second value range corresponding to the modulator based on steps (2-1) to (2-6), the second value can be selected from the second value range corresponding to the modulator, and then the second value can be fed back to the first device to further constrain the value range of the chirp parameter of the modulator of the first device, thereby enabling precise adjustment of the chirp parameter.

[0301] In this embodiment, the deviation between the second values ​​configured for the chirp parameters of multiple modulators is lower than a preset deviation value. The preset deviation value refers to a pre-set deviation value, such as 0.2 or 0.3. This means that the first values ​​configured for the chirp parameters of multiple modulators are similar. Thus, when faced with selecting values ​​for the chirp parameters of different modulators, the principle of making the values ​​of the chirp parameters of multiple modulators similar can be used to select the corresponding first value. This reduces the differences in the chirp parameters of different modulators, making the chirp parameters of different modulators more consistent, thereby reducing the complexity between the chirp parameters of different modulators and making the management of the chirp parameters of different modulators easier.

[0302] It is worth noting that the delay of the optical signal transmission to the second device is related to the wavelength value, dispersion slope and transmission distance of the optical signal, as shown in Equation (7).

[0303]

[0304] In the formula, τ(λ) represents the time delay of the optical signal transmission to the second device; λ represents the wavelength of the optical signal; λ ZD λ represents the wavelength value corresponding to a dispersion value of 0; D(λ) represents the dispersion value generated by the optical signal during transmission; s0 represents the dispersion slope.

[0305] Based on the above expression (7), it can be seen that the time delay of the optical signal transmitted to the second device is related to the dispersion value generated by the optical signal during the transmission process. Therefore, this application measures the actual time delay of the optical signal transmitted to the second device at multiple wavelengths, and then calculates the dispersion value corresponding to the optical signal based on the actual time delay of the optical signal transmitted to the second device at multiple wavelengths, so as to more accurately calculate the second value range.

[0306] Understandably, in some embodiments, taking the initial chirp parameters of each modulator as being within the first value range corresponding to each modulator, if the second value range corresponding to the modulator is less than the first value range, the second device returns the second value range corresponding to the modulator to the first device. If the second value range corresponding to the modulator is greater than or equal to the first value range, the second device does not need to return the second value range corresponding to the modulator to the first device. In other embodiments, taking the initial chirp parameters of each modulator not being within the first value range corresponding to each modulator as an example, the second device can directly return the second value range corresponding to the modulator to the first device.

[0307] In this embodiment, the chirp reference information is included in the free field of the data frame transmitted by the second optical signal.

[0308] The idle field can be a padding bit field, which can be used to implement the functions of a feedback channel or a backchannel. Thus, by carrying chirp reference information through the idle field of the data frame, information exchange between the second and first devices can be achieved.

[0309] In some embodiments, the free field may or may not be protected by forward error correction (FEC), and this application does not impose any restrictions on this. FEC is a data transmission technique that adds redundant information at the sending end, enabling the receiving end to recover the original data even if some data is lost or corrupted.

[0310] For example, Figure 10 This is a schematic diagram of the structure of a data frame provided in an embodiment of this application. See also... Figure 10 The data frame may include multiple service codewords and a free field. The free field may include multiple symbols, and in this embodiment, one or more symbols from the free field may be used to send information back to the first device.

[0311] In some embodiments, taking the chirp reference information including the wavelength number of the modulator, whether the chirp parameter is adjusted, the polarity of the chirp parameter, and the second value of the chirp parameter as an example, the four symbols in the idle field can be used to feed back information to the first device.

[0312] For example, the wavelength number of the modulator can be represented by a channel index (lane_idx) symbol, such as 0, 1, 2, 3. It is understood that one modulator corresponds to one wavelength number. Table 1 shows a mapping relationship between wavelength numbers and lane_idx symbols, where 00 can be used to represent wavelength number 0, 01 to represent wavelength number 1, 10 to represent wavelength number 2, and 11 to represent wavelength number 3. It is understood that when there are four wavelength numbers, two bits can be allocated to the lane_idx symbol.

[0313] Table 1

[0314] Wavelength number lane_idx symbol 0 00 1 01 2 10 3 11

[0315] For example, an adjustment flag (adjust_flag) symbol can be used to indicate whether the chirp parameter is adjusted. As shown in Table 2, a mapping relationship between whether the chirp parameter is adjusted and the adjust_flag symbol is illustrated, where 0 can be used to represent no, that is, the chirp parameter is not adjusted, and 1 can be used to represent yes, that is, the chirp parameter is adjusted.

[0316] Table 2

[0317] Should the chirp parameter be adjusted? adjust_flag symbol yes 1 no 0

[0318] For example, a sign bit (sign_bit) can be used to represent the polarity of the chirp parameter. Table 3 shows a mapping relationship between chirp notation and sign_bit notation, where 1 can be used to represent positive polarity and 0 can be used to represent negative polarity.

[0319] Table 3

[0320]

[0321]

[0322] For example, the second value of the chirp parameter can be represented by a chirp_value_bit symbol. Table 4 shows one mapping relationship between the second value of the chirp parameter and the chirp_value_bit symbol. It can be understood that when there are 16 possible second values ​​for the chirp parameter, 4 bits can be allocated to the chirp_value_bit symbol.

[0323] Table 4

[0324] Values ​​of the chirp parameter chirp_value_bit symbol 0 0000 0.1 0001 0.2 0010 0.3 0011 0.4 0100 0.5 0101 0.6 0110 0.7 0111 0.8 1000 0.9 1001 1.0 1010 1.1 1011 1.2 1100 1.3 1101 1.4 1110 1.5 1111

[0325] It is worth noting that in other embodiments, other codeword definitions can also be used to transmit feedback information, such as link status (LS) or link training, etc., and this application does not limit this.

[0326] S904, The first device receives the second optical signal sent by the second device.

[0327] S905. The first device adjusts the chirp parameters of its modulator based on the second optical signal.

[0328] In some embodiments, the first device adjusts the chirp parameters of its modulator in response to a second optical signal indicating adjustment. In other embodiments, the first device does not adjust its chirp parameters in response to a second optical signal indicating no adjustment.

[0329] For example, assuming the value of the adjust_flag symbol is 0, it means that the chirp parameter does not need to be adjusted, and therefore no configuration of the modulator needs to be changed. Assuming the value of the adjust_flag symbol is 1, it means that the chirp parameter needs to be adjusted, and therefore the chirp parameter of the modulator for the wavelength number is adjusted.

[0330] In some embodiments, when the second optical signal carries a second value corresponding to the modulator to be adjusted, the above S805 can be replaced by: the first device configuring the chirp parameter of the modulator to the second value based on the second value carried by the second optical signal.

[0331] In this embodiment, by carrying a second value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the second value. Since the second value is within the range of the second value corresponding to the modulator, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured with the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0332] In some other embodiments, when the second optical signal carries a second value range corresponding to the modulator to be adjusted, the above-described S805 can be replaced by: the first device configuring the chirp parameter of the modulator based on the second value range carried by the second optical signal. For example, the chirp parameter of the modulator is configured to a second value, wherein the second value is within the second value range corresponding to the modulator.

[0333] In this embodiment, by carrying a second value range corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the second value range, so as to configure the chirp parameter of the modulator to a second value. In this way, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured to the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0334] In other embodiments, when there is a delay in the transmission of the first optical signal carried by the second optical signal to the second device, the above-described S805 can be replaced by: the first device determining a second value range corresponding to the modulator based on the delay in the transmission of the first optical signal carried by the second optical signal to the second device. Then, based on the second value range corresponding to the modulator, the chirp parameter of the modulator is configured. For example, the chirp parameter of the modulator is configured as a second value, wherein the second value is within the second value range corresponding to the modulator.

[0335] In this embodiment, the delay in the transmission of the first optical signal to the second device, carried by the second optical signal, is used to instruct the first device to adjust the chirp parameter of the modulator based on this delay. Specifically, a second value range corresponding to the modulator is determined based on the delay in the transmission of the first optical signal to the second device, and then the chirp parameter of the modulator is configured to a second value based on this second value range. This ensures that the dispersion cost generated when transmitting optical signals using a modulator configured with the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0336] The process by which the first device determines the second value range corresponding to the modulator based on the time delay of the transmission of the first optical signal carried by the second optical signal to the second device may include: determining the objective function relationship based on the time delay of the transmission of the first optical signal to the second device; determining the dispersion value corresponding to the modulator based on the wavelength value corresponding to the modulator and the objective function relationship; determining the second candidate value corresponding to the modulator based on the dispersion value corresponding to the modulator and the optical transmission simulation results; and determining the second value range corresponding to the modulator based on the second candidate value. It is understood that the first device may pre-store the optical transmission simulation results. It is worth noting that the process by which the first device determines the second value range is consistent with the process by which the second device determines the second value range described above, and will not be repeated here.

[0337] Thus, a method is provided for a first device to determine a second value range, which can quickly and efficiently determine the second value range corresponding to different modulators. Furthermore, by further constraining the value range of the chirp parameter of the modulator of the first device based on the second value range, precise adjustment of the chirp parameter can be achieved.

[0338] The first optical signal includes optical signals of multiple wavelengths. Correspondingly, the process by which the first device determines the objective function relationship based on the time delay of the first optical signal transmission to the second device may include: for every two wavelengths of optical signal, determining the dispersion value corresponding to the average wavelength value based on the time delay and wavelength value of the two wavelengths; and fitting the multiple average wavelength values ​​with the corresponding dispersion values ​​to obtain the objective function relationship. It is worth noting that the process by which the first device determines the objective function relationship is consistent with the process by which the second device determines the objective function relationship described above, and will not be repeated here.

[0339] Thus, a method is provided whereby the first device obtains the target functional relationship based on fitting. Furthermore, this target functional relationship can indicate the functional relationship between the dispersion value and the wavelength value, so that the dispersion value corresponding to different modulators can be determined based on the target functional relationship, thereby determining the second value range corresponding to different modulators.

[0340] In other embodiments, when the second optical signal carries the dispersion value corresponding to the modulator to be adjusted, the above-described S805 can be replaced by: the first device determining a second value range corresponding to the modulator based on the dispersion value corresponding to the modulator to be adjusted carried by the second optical signal. Then, based on the second value range corresponding to the modulator, the chirp parameter of the modulator is configured to a second value. The second value is within the second value range corresponding to the modulator.

[0341] The process of the first device determining the second value range of the modulator based on the dispersion value of the modulator to be adjusted carried by the second optical signal may include: determining the dispersion value of the modulator based on the wavelength value of the modulator and the target function relationship.

[0342] In this embodiment, by carrying the dispersion value corresponding to the modulator to be adjusted in the second optical signal, the first device is instructed to adjust the chirp parameter of the modulator based on the dispersion value of the modulator to be adjusted. Specifically, a second value range corresponding to the modulator is determined according to the dispersion value of the modulator to be adjusted, and then the chirp parameter of the modulator is configured to a second value based on the second value range. In this way, it can be ensured that the dispersion cost generated when transmitting optical signals using a modulator configured with the second value is lower than a preset threshold, thereby effectively reducing the dispersion cost generated during optical transmission.

[0343] The chirp parameter adjustment process of the modulator can be completed by using any one of the following adjustment methods one to four.

[0344] Adjustment Method 1: Adjustment of chirp parameters, achieved by adjusting the unequal splitting ratio of the spectrometer.

[0345] In some embodiments, the first device determines a second splitting ratio based on a second value, configuring the unequal splitting ratio of the beam splitter as the second splitting ratio. The second splitting ratio refers to the unequal splitting ratio determined based on the second value.

[0346] In this embodiment, the absolute value of the chirp parameter is equal to four times the deviation value of the unequal splitting ratio. Accordingly, the deviation value of the unequal splitting ratio can be determined based on the second value and the above formula (3). Furthermore, the second splitting ratio can be determined based on the deviation value of the unequal splitting ratio and 0.5+Δ:0.5-Δ.

[0347] This provides a method for adjusting the chirp parameter. Specifically, the chirp parameter can be adjusted by regulating the unequal splitting ratio of the beam splitter.

[0348] The second adjustment method involves adjusting the chirp parameter by adjusting the voltage amplitude of the radio frequency signal.

[0349] In some embodiments, the first device determines a second amplitude value based on a second value, and configures the voltage amplitude value of the radio frequency signal as the second amplitude value. The second amplitude value refers to the voltage amplitude value determined based on the second value.

[0350] In this embodiment, the absolute value of the chirp parameter is equal to the deviation of the voltage amplitude value. Accordingly, the deviation of the voltage amplitude value can be determined based on the second value and the above formula (4). Furthermore, the second amplitude value can be determined based on the deviation of the voltage amplitude value and (1+Δ) and -(1-Δ).

[0351] This provides a method for adjusting the chirp parameter. Specifically, the chirp parameter can be adjusted by regulating the voltage amplitude of the modulator's radio frequency signal.

[0352] The third adjustment method is to adjust the chirp parameter, which is achieved by adjusting the unequal splitting ratio of the beam splitter and the voltage amplitude of the radio frequency signal.

[0353] In some embodiments, the first device determines a second splitting ratio and a second amplitude value based on a second value, configures the unequal splitting ratio of the splitter as the second splitting ratio, and configures the voltage amplitude value of the radio frequency signal as the second amplitude value.

[0354] In this embodiment, the absolute value of the chirp parameter is equal to four times the deviation of the splitting ratio and the sum of the deviation of the voltage amplitude. Accordingly, the deviation of the splitting ratio and the deviation of the voltage amplitude can be determined based on the second value and the above formula (5). Furthermore, the second splitting ratio can be determined based on the deviation of the splitting ratio and 0.5+Δ1:0.5-Δ1. The second amplitude value can be determined based on the deviation of the voltage amplitude and (1+Δ2) and -(1-Δ2).

[0355] This provides a method for adjusting the chirp parameter. Specifically, the chirp parameter can be adjusted by changing the unequal splitting ratio of the beam splitter and the voltage amplitude of the radio frequency signal.

[0356] Adjustment Method 4: The chirp parameter is adjusted by adjusting the bias voltage value.

[0357] In some embodiments, the first device determines a target voltage value based on a second value and configures the bias voltage value as the target voltage value.

[0358] The chirp parameter is related to the bias voltage of the modulator.

[0359] In some embodiments, the first device may pre-store a mapping relationship between the modulator's bias voltage and the chirp parameter values, such as pre-stored in the form of a mapping table in the optical module or the memory (e.g., storage medium) of the first device. Then, the first device may determine the target voltage value corresponding to the second value based on the pre-stored mapping relationship between the second value and the second value.

[0360] Alternatively, in some other embodiments, the first device may also determine the target voltage value based on the second value and the following formula (8).

[0361] α=V bias ×0.6-1.8 (8)

[0362] In the formula, α represents the chirp parameter; V bias This is the bias voltage on the modulator.

[0363] For example, taking a chirp parameter of -0.6 as an example, the target voltage value V can be calculated based on the above formula (8). bias =2.

[0364] This provides a method for adjusting the chirp parameter. Specifically, the chirp parameter can be adjusted by regulating the bias voltage of the modulator.

[0365] It is worth noting that adjustment methods one through three described above can be applied to modulators equipped with a beam splitter and loaded with an RF signal, such as MZM modulators. Adjustment method four described above can be applied to modulators loaded with a bias voltage, such as EML or EAM modulators.

[0366] The technical solution provided in this application embodiment involves the second device transmitting a first optical signal to the first device, after which the second device returns a second optical signal to the first device based on the first optical signal. The first device then adjusts the chirp parameters of its modulator according to the indication of the second optical signal. Thus, through the cooperation of the first and second devices, the chirp parameters can be adjusted according to the actual transmission of the optical signal, thereby achieving precise adjustment of the chirp parameters.

[0367] It should be noted that the above description is for the purpose of more clearly illustrating the optical transmission method described in the embodiments of this application, and should not be construed as limiting the specific implementation of this application.

[0368] The above mainly describes the solutions provided by the embodiments of this application from the perspective of processing flow. Accordingly, the embodiments of this application also provide an optical transmission device for implementing the various methods described above. This optical transmission device can be one of the methods described above, or include the aforementioned devices, or be a usable component. It is understood that, in order to achieve the above functions, the optical transmission device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0369] This application embodiment can divide the optical transmission device into functional modules according to the above method embodiment. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be understood that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0370] For example, Figure 11 This is a schematic diagram of an optical transmission device provided in an embodiment of this application. See also... Figure 11 The optical transmission device includes an acquisition module 1101 and a transmission module 1102. Wherein:

[0371] Module 1101 is used to perform the above. Figure 4 S401 as shown;

[0372] Transmission module 1102 is used to perform the above. Figure 4 S402 is shown.

[0373] For example, Figure 12 This is a schematic diagram of another optical transmission device provided in an embodiment of this application. See also... Figure 12 The optical transmission device includes a transmitting module 1201, a receiving module 1202, and an adjustment module 1203. Wherein:

[0374] Sending module 1201 is used to perform the above. Figure 9 S901 as shown;

[0375] Receiver module 1202 is used to perform the above. Figure 9 S904 as shown;

[0376] Adjustment module 1203 is used to perform the above. Figure 9 The S905 shown.

[0377] For example, Figure 13 This is a schematic diagram of another optical transmission device provided in an embodiment of this application. See also... Figure 13 The optical transmission device includes a receiving module 1301 and a transmitting module 1302. Wherein:

[0378] Receiver module 1301 is used to perform the above. Figure 9 S902 as shown;

[0379] Sending module 1302 is used to perform the above. Figure 9 The S903 shown.

[0380] For a detailed description of the above-mentioned optional methods, please refer to the foregoing method embodiments, which will not be repeated here. Furthermore, the explanation of any of the optical transmission devices provided above and the description of their beneficial effects can be found in the corresponding method embodiments described above, and will not be repeated here.

[0381] As an example, combined Figure 2 The above Figure 11 The acquisition module 1101 and transmission module 1102 in the optical transmission device shown, or the above-mentioned... Figure 12 The optical transmission device shown includes the transmitting module 1201, receiving module 1202, and adjustment module 1203, or the aforementioned components. Figure 13 The functions implemented by some or all of the receiving module 1301 and transmitting module 1302 in the optical transmission device shown can be achieved through Figure 2 The optical module is implemented in [the system / process].

[0382] As another example, combining Figure 3 The above Figure 11 The acquisition module 1101 and transmission module 1102 in the optical transmission device shown, or the above-mentioned... Figure 12The optical transmission device shown includes the transmitting module 1201, receiving module 1202, and adjustment module 1203, or the aforementioned components. Figure 13 The functions implemented by some or all of the receiving module 1301 and transmitting module 1302 in the optical transmission device shown can be achieved through Figure 3 The communication equipment in the process is implemented.

[0383] In this embodiment, the optical transmission device is presented in an integrated manner, divided into various functional modules. (The last sentence appears to be incomplete and possibly refers to a different application.) Figure 2 In the context of optical modules implementing the functions of various functional modules, "module" here can refer to the processor, modulator, memory, interface (such as an optical interface), and / or other devices within the optical module that can provide the aforementioned functions. (This is achieved through...) Figure 3 In the context of communication equipment implementing the functions of various modules, "module" here can refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory executing one or more software or firmware programs, integrated logic circuits, and / or other devices that can provide the aforementioned functions. In a simple embodiment, those skilled in the art will recognize that the optical transmission device can employ... Figure 2 The optical module shown or Figure 3 The form of the communication device shown.

[0384] Since the optical transmission device provided in this application embodiment can perform the above-described optical transmission method, the technical effects it can achieve can be referred to the above-described method embodiment, and will not be repeated here.

[0385] It should be understood that one or more of the above modules or units can be implemented by software, hardware, or a combination of both. When any of the above modules or units are implemented by software, the software exists as computer program instructions and is stored in memory. The processor can be used to execute the program instructions and implement the above method flow. The processor can be built into a system-on-chip (SoC) or ASIC, or it can be a separate semiconductor chip. In addition to the core that executes software instructions for computation or processing, the processor may further include necessary hardware accelerators, such as field-programmable gate arrays (FPGAs), programmable logic devices (PLDs), or logic circuits that implement dedicated logic operations.

[0386] When the above modules or units are implemented in hardware, the hardware can be any one or any combination of a microprocessor, digital signal processing (DSP) chip, microcontroller unit (MCU), artificial intelligence processor, ASIC, SoC, FPGA, PLD, application-specific digital circuit, hardware accelerator, or non-integrated discrete device, which can run the necessary software or perform the above method flow independently of software.

[0387] Optionally, embodiments of this application also provide a first device (e.g., the first device may be a chip or a chip system), the first device including a processor for implementing the method executed by the first device in any of the above method embodiments. In one possible design, the first device further includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the first device to execute the method in any of the above method embodiments. Of course, the memory may not be included in the first device. When the first device is a chip system, it may be composed of chips or may include chips and other discrete devices; embodiments of this application do not specifically limit this.

[0388] Optionally, embodiments of this application also provide a second device (e.g., the second device may be a chip or a chip system), the second device including a processor for implementing the method executed by the second device in any of the above method embodiments. In one possible design, the second device further includes a memory. The memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the second device to execute the method in any of the above method embodiments. Of course, the memory may not be included in the second device. When the second device is a chip system, it may be composed of chips or may include chips and other discrete devices; embodiments of this application do not specifically limit this.

[0389] This application also provides a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are executed on a first device, the first device performs the method executed by any of the optical transmission devices provided above. When the computer-executable instructions are executed on a second device, the second device performs the method executed by any of the optical transmission devices provided above.

[0390] For explanations of the relevant content and descriptions of the beneficial effects in any of the computer-readable storage media provided above, please refer to the corresponding embodiments described above, which will not be repeated here.

[0391] This application also provides a chip. This chip integrates a control circuit for implementing the functions of the aforementioned optical transmission device and one or more ports. Optionally, the functions supported by this chip can be referred to above, and will not be repeated here. Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by a program instructing related hardware. This program can be stored in a computer-readable storage medium. The aforementioned storage medium can be a read-only memory, random access memory, etc. The aforementioned processing unit or processor can be a central processing unit, a general-purpose processor, an application-specific integrated circuit (ASIC), a microprocessor (digital signal processor, DSP), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof.

[0392] This application also provides a computer program product containing computer-executable instructions. When the computer-executable instructions are executed on a first device, the first device performs any of the methods described in the above embodiments. The computer program product includes one or more computer-executable instructions. When the computer-executable instructions are loaded and executed on the first device, all or part of the flow or function according to the embodiments of this application is generated. The first device may be a network device or other programmable device. When the computer-executable instructions are executed on a second device, the second device performs any of the methods described in the above embodiments. The computer program product includes one or more computer-executable instructions. When the computer-executable instructions are loaded and executed on the second device, all or part of the flow or function according to the embodiments of this application is generated. The second device may be a network device or other programmable device.

[0393] Computer-executable instructions can be stored in or transmitted from one computer-readable storage medium to another. For example, computer-executable instructions can be transmitted from one website, computer, network device, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. A computer-readable storage medium can be any available medium accessible to a network device or a data storage device such as a network device or data center that integrates one or more media. Available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital versatile discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0394] It should be noted that the devices for storing computer instructions or computer programs provided in the embodiments of this application, such as but not limited to the memory, computer-readable storage medium and communication chip, are all non-transitory.

[0395] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product.

[0396] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, the disclosure, and the appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0397] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. An optical transmission method, characterized in that, The method is applied to a first device, which includes multiple modulators, each corresponding to an optical signal of a different wavelength. The first value range of the chirp parameter corresponding to the different wavelength modulators is different. The dispersion cost generated by transmitting the optical signal using the chirp parameter within the first value range is lower than a preset threshold. The method includes: Obtain the data to be transmitted; The data is transmitted in the form of optical signals using the multiple modulators.

2. The method according to claim 1, characterized in that, In an optical transmission system with a transmission rate of 800Gbps, a transmission distance of 5km and based on coarse wavelength division multiplexing (CWDM4), the first range of the chirp parameter of the modulator with a wavelength of 1271nm is (0.1, 1); the first range of the chirp parameter of the modulator with a wavelength of 1331nm is (-1, 0.4).

3. The method according to claim 1 or 2, characterized in that, In an optical transmission system based on CWDM4 with a transmission rate of 800Gbps and a transmission distance of 5km, the first range of the chirp parameter of the modulator with a wavelength of 1291nm is (-0.2, 1); the first range of the chirp parameter of the modulator with a wavelength of 1311nm is (-1, 1).

4. The method according to claim 1, characterized in that, In an optical transmission system based on CWDM4 with a transmission rate of 1.6Tbps and a transmission distance of 3km, the first range of the chirp parameter of the modulator with a wavelength of 1271nm is (0.7, 1); the first range of the chirp parameter of the modulator with a wavelength of 1331nm is (-1, -0.3).

5. The method according to claim 1 or 4, characterized in that, In an optical transmission system based on CWDM4 with a transmission rate of 1.6Tbps and a transmission distance of 3km, the first range of the chirp parameter of the modulator with a wavelength of 1291nm is (0.3, 1); the first range of the chirp parameter of the modulator with a wavelength of 1311nm is (-1, 1).

6. The method according to any one of claims 1-5, characterized in that, Before employing the plurality of modulators to transmit the data in the form of an optical signal, for each modulator, the method further includes: Configure the chirp parameters of the modulator based on the first value range corresponding to the modulator.

7. The method according to claim 6, characterized in that, The modulator includes a beam splitter, and the chirp parameters are configured by configuring the unequal splitting ratio of the beam splitter.

8. The method according to claim 7, characterized in that, The absolute value of the chirp parameter is equal to four times the deviation value of the unequal spectral ratio.

9. The method according to claim 6, characterized in that, The modulator has radio frequency signals loaded on its two optical transmission paths, and the chirp parameters are configured by configuring the voltage amplitude value of the radio frequency signals.

10. The method according to claim 9, characterized in that, The absolute value of the chirp parameter is equal to the deviation of the voltage amplitude value.

11. The method according to claim 6, characterized in that, The modulator includes a beam splitter and radio frequency signals are loaded on two optical transmission paths. The chirp parameters are configured by configuring the unequal splitting ratio of the beam splitter and the voltage amplitude value of the radio frequency signals.

12. The method according to claim 11, characterized in that, The absolute value of the chirp parameter is equal to four times the deviation of the unequal splitting ratio and the sum of the deviation of the voltage amplitude.

13. The method according to claim 6, characterized in that, The modulator is loaded with a bias voltage, and the chirp parameter is configured by configuring the voltage range of the bias voltage.

14. The method according to claim 13, characterized in that, When the voltage range is configured as a first range, the intensity of the output optical signal is negatively correlated with the voltage of the applied radio frequency signal, making the chirp parameter positive; when the voltage range is configured as a second range, the intensity of the output optical signal is positively correlated with the voltage of the applied radio frequency signal, making the chirp parameter negative.

15. The method according to any one of claims 1-14, characterized in that, The deviation between the first values ​​configured for the chirp parameters of the plurality of modulators is lower than a preset deviation value.

16. The method according to any one of claims 1-15, characterized in that, In an optical transmission system based on CWDM4 with a transmission rate of 800Gbps and a transmission distance of 5km, the chirp parameters of the plurality of modulators are configured with a first value in the range of (0.1, 0.4).

17. The method according to any one of claims 1-16, characterized in that, The first value range is determined based on a first candidate value among multiple candidate values ​​of the chirp parameter. The first candidate value is a dispersion cost that is lower than a preset threshold and is within the dispersion range corresponding to the modulator. The first candidate value is determined based on optical transmission simulation results. The optical transmission simulation results are used to characterize the result of simulating optical signal transmission based on the multiple candidate values ​​to obtain the dispersion cost corresponding to the multiple candidate values.

18. An optical transmission method, characterized in that, Applied to a second device, the method includes: Receive the first optical signal sent by the first device; Based on the first optical signal, a second optical signal is sent to the first device. The second optical signal carries chirp reference information, which is used to adjust the chirp parameters of the modulator of the first device.

19. The method according to claim 18, characterized in that, The chirp reference information includes a second value corresponding to the modulator to be adjusted, and the dispersion cost generated by transmitting optical signals using the chirp parameters of the second value is lower than a preset threshold.

20. The method according to claim 18, characterized in that, The chirp reference information includes a second value range corresponding to the modulator to be adjusted, and the dispersion cost generated by transmitting optical signals using chirp parameters within the second value range is lower than a preset threshold.

21. The method according to claim 20, characterized in that, The number of modulators is multiple, and different modulators correspond to optical signals of different wavelengths; For each modulator, the process of determining the second value range includes: Based on the wavelength value of the optical signal transmitted by the modulator and the target function relationship, the dispersion value corresponding to the modulator is determined, and the target function relationship is used to indicate the functional relationship between the dispersion value and the wavelength value; Based on the dispersion value corresponding to the modulator and the optical transmission simulation results, a second candidate value corresponding to the modulator is determined. The optical transmission simulation results are used to characterize the result of simulating optical signal transmission based on multiple candidate values ​​of the chirp parameter to obtain the dispersion cost corresponding to the multiple candidate values. The second candidate value is a candidate value whose dispersion cost is lower than a preset threshold and corresponds to the dispersion value. Based on the second candidate value corresponding to the modulator, the second value range corresponding to the modulator is determined.

22. The method according to claim 21, characterized in that, The process of determining the objective function relationship includes: The time delay of transmitting optical signals of multiple wavelengths to the second device is obtained; For every two wavelengths of optical signal, based on the time delay and wavelength value of the two wavelengths of optical signal, the dispersion value corresponding to the average wavelength value is determined, where the average wavelength value is the average wavelength value of the two wavelengths of optical signal; The objective function relationship is obtained by fitting multiple average wavelength values ​​with the corresponding dispersion values.

23. The method according to claim 18, characterized in that, The chirp reference information includes the time delay of the transmission of the first optical signal to the second device, and the first optical signal includes optical signals of multiple wavelengths.

24. The method according to claim 18, characterized in that, The chirp reference information includes the dispersion value corresponding to the modulator to be adjusted.

25. The method according to any one of claims 18-24, characterized in that, The chirp reference information is included in the free field of the data frame transmitted by the second optical signal.

26. An optical transmission device, characterized in that, The device is applied to a first device, which includes multiple modulators, each corresponding to an optical signal of a different wavelength. The first value range of the chirp parameter corresponding to the different wavelength modulators is different. The dispersion cost generated by transmitting the optical signal using the chirp parameter within the first value range is lower than a preset threshold. The device includes: The acquisition module is used to acquire the data to be transmitted. A transmission module is used to transmit the data in the form of optical signals using the plurality of modulators.

27. An optical transmission device, characterized in that, Applied to a second device, the device includes: The receiving module is used to receive the first optical signal sent by the first device; The transmitting module is configured to transmit a second optical signal to the first device based on the first optical signal. The second optical signal carries chirp reference information, which is used to adjust the chirp parameters of the modulator of the first device.

28. An optical module, characterized in that, The device includes multiple modulators, a processor, and an interface. Different modulators correspond to optical signals of different wavelengths. The first value range of the chirp parameter corresponding to different wavelength modulators is different. The dispersion cost generated by transmitting optical signals using chirp parameters within the first value range is lower than a preset threshold. The interface is used to transmit optical signals. The processor is used to execute the method as described in any one of claims 1-17.

29. A first device, characterized in that, It includes multiple modulators and a processor. Different modulators correspond to optical signals of different wavelengths. The first value range of the chirp parameter corresponding to the different wavelength modulators is different. The dispersion cost generated by transmitting the optical signal using the chirp parameter within the first value range is lower than a preset threshold. The processor is used to execute the method as described in any one of claims 1-17.

30. A second device, characterized in that, Includes a processor for performing the method as described in any one of claims 18-25.

31. An optical transmission system, characterized in that, It includes the first device as described in claim 29 and the second device as described in claim 30.

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