Driver for optical module, control method and optical module

Abstract

The invention relates to the technical field of optical modules, and discloses a driver for an optical module, a control method and the optical module, and the driver comprises a first detection device, a gain control device, a second detection device and a regulation and control device. Wherein the first detection device is connected with the input end of the driver, and the first detection device is used for detecting a first signal-to-noise ratio of an input signal of the driver; the gain control device is connected between the input end of the driver and the output end of the driver, and the gain control device is used for performing gain amplification on an input signal of the driver; the second detection device is connected with the output end of the driver, and the second detection device is used for detecting a second signal-to-noise ratio of the output signal; the regulation and control device is connected with the first detection device, the second detection device and the gain control device, and the regulation and control device is used for adjusting the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio. The problem that the same LPO is difficult to adapt to different ports of the switch can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of optical modules, and specifically relates to a driver for an optical module, a control method, and an optical module. Background Art

[0002] Currently, due to differences in link lengths of different ports of a switch, the performance of the electrical signals output to a Linear-driver Pluggable Optics (LPO) is not the same, resulting in differences in the output signals obtained by the driver in the LPO on different ports based on the electrical signals, which affects the performance of the optical signals generated by the subsequent laser. The gain set by the driver is a fixed value, which may make it difficult for the LPO to flexibly adjust the output signal of the driver, and it is difficult for the same LPO to adapt to different ports of the switch. Summary of the Invention

[0003] In view of this, the present disclosure provides a driver for an optical module, a control method, and an optical module to solve the problem that it is difficult for the same LPO to adapt to different ports of a switch.

[0004] In a first aspect, the present disclosure provides a driver for an optical module, and the driver includes:

[0005] A first detection device, the first detection device is connected to the input end of the driver, and the first detection device is used to detect a first signal-to-noise ratio of an input signal of the driver;

[0006] A gain control device, the gain control device is connected between the input end and the output end of the driver, and the gain control device is used to perform gain amplification on the input signal of the driver;

[0007] A second detection device, the second detection device is connected to the output end of the driver, and the second detection device is used to detect a second signal-to-noise ratio of an output signal of the driver;

[0008] A regulation device, the regulation device is respectively connected to the first detection device, the second detection device, and the gain control device, and the regulation device is used to adjust the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio.

[0009] Second aspect, the present disclosure provides a control method for a driver of an optical module, which is applied to a regulation device in the driver. The regulation device is respectively connected to a first detection device, a gain control device, and a second detection device of the driver; wherein, the first detection device is used to detect a first signal-to-noise ratio of an input signal of the driver; the gain control device is used to perform gain amplification on the input signal of the driver; the second detection device is used to detect a second signal-to-noise ratio of an output signal of the driver; the method includes:

[0010] Adjust the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio.

[0011] Third aspect, the present disclosure provides an optical module, including:

[0012] An input device for connecting to a switch;

[0013] The driver of the first aspect or any corresponding embodiment thereof;

[0014] A laser, a driving end of the laser is connected to an output end of the driver, and the laser is used to emit an optical signal under the drive of the output signal of the driver.

[0015] For the driver of the optical module provided by the embodiments of the present disclosure, a first detection device and a second detection device are provided in the driver. The first detection device is used to detect the first signal-to-noise ratio of the input signal of the driver, and the second detection device is used to detect the second signal-to-noise ratio of the output signal of the driver, so that the regulation device of the driver adjusts the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio. Therefore, it is possible to adjust the gain for gain amplification of the gain control device according to the variation relationship between the second signal-to-noise ratio and the first signal-to-noise ratio, so as to adjust the distortion signal to make the output of the gain control device as stable as possible. When the first signal-to-noise ratio is relatively high (i.e., the input signal of the driver is good), the difference between the second signal-to-noise ratio and the first signal-to-noise ratio is small. When the first signal-to-noise ratio is relatively low, the difference between the second signal-to-noise ratio and the first signal-to-noise ratio is large (i.e., the second signal-to-noise ratio is made higher and the output signal of the driver is better), so as to ensure the stability and consistency of the output signal of the driver under different input signals, thereby solving the problem of large differences in the driver output of LPO under different link conditions, and enabling the LPO using the driver of the present disclosure to adapt to different switch systems and different ports of the same switch.

[0016] Regarding the beneficial effects of the control method for the driver of the optical module and the optical module, they correspond to the beneficial effects of the driver of the optical module, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the working principle of the driver of the LPO according to an embodiment of the present disclosure;

[0019] Figure 2 It is a schematic structural diagram of the first driver for an optical module according to an embodiment of the present disclosure;

[0020] Figure 3 It is a schematic structural diagram of the second driver for an optical module according to an embodiment of the present disclosure;

[0021] Figure 4 It is a schematic structural diagram of the third driver for an optical module according to an embodiment of the present disclosure;

[0022] Figure 5 It is a schematic structural diagram of the fourth driver for an optical module according to an embodiment of the present disclosure;

[0023] Figure 6 It is a schematic structural diagram of the fifth driver for an optical module according to an embodiment of the present disclosure

[0024] Figure 7 It is a schematic diagram of the gain of the driver in different frequency ranges according to the related art;

[0025] Figure 8 It is a schematic diagram of the gain of the driver in different frequency ranges according to an embodiment of the present disclosure;

[0026] Figure 9 It is the extinction ratio distribution diagram of the 800G LPO module according to the related art;

[0027] Figure 10 It is the extinction ratio distribution diagram of the 800G LPO module according to an embodiment of the present disclosure;

[0028] Figure 11 It is a structural block diagram of an optical module according to an embodiment of the present disclosure.

[0029] The accompanying reference numerals are as follows: 1, driver; 11, first detection device; 12, gain control device; 121, gain control module; 1211, first gain unit; 1212, second gain unit; 122, feedforward equalizer; 1221, first filtering unit; C1, first capacitor; R1, first resistor; R2, second resistor; 1222, second filtering unit; C2, second capacitor; C3, third capacitor; R3, third resistor; R4, fourth resistor; 13, second detection device; 14, regulation device; 15, linear equalizer; 16, baseline drift correction device; 17, output buffer; C4, fourth capacitor; C5, fifth capacitor; 2, laser; 3, input device. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0031] With the rapid development of technologies such as artificial intelligence (AI), cloud computing, and big data, large global data centers are being upgraded and constructed. The demand for high-speed optical modules has surged, driving the capacity of optical modules to gradually evolve towards 400G, 800G, and 1.6T.

[0032] Currently, mainstream high-speed optical modules mainly process signals through digital signal processor (DSP) electrical chips to achieve a low bit error rate. The DSP is a high-speed digital processing chip. In addition to providing digital regeneration and clock recovery functions for clock and data recovery (CDR), the DSP can also perform operations such as dispersion compensation, noise reduction, and nonlinear compensation. However, the DSP has high costs, large latency, and high power consumption. Therefore, a linear-driver pluggable optics (LPO) has been proposed in the related technologies.

[0033] The LPO is a pluggable optical module implemented based on linear driver chip technology. The LPO adopts linear analog components in the data link and has a design scheme without CDR or DSP.

[0034] See Figure 1 , Figure 1It is a schematic diagram of the working principle of a driver for LPO. The driver for LPO is an alternative solution for reducing power consumption of retimers, DSPs, or CDRs in high-speed serializer / deserializer (SerDes) architectures. LPO leverages the capabilities of the SerDes at the signal transmitter end to add continuous-time linear equalization (CTLE) / equalization (EQ) capabilities at the input (Input) or output buffer (Buffer) of the optical module's gold fingers. The high-frequency signals input at the front end are pre-compensated through CTLE / EQ. Then, CTLE and automatic gain control (AGC) are used to control a variable gain amplifier (VGA) to linearly amplify the input signal. And output drive equalization is performed on the signal output by the VGA to drive the laser to emit an optical signal. Compared with optical modules with DSPs, LPO can significantly reduce system power consumption and latency.

[0035] However, the transmission performance of LPO is average and its interoperability is poor. Exemplarily, the data of 800G LPO and optical modules with DSPs are compared as shown in Table 1.

[0036] Table 1

[0037] Type Power Consumption Latency Cost Bit Error Rate 800G DR8 (LPO Solution) ～8.5W ~2ns Y 1E-9 800G DR8 (DSP Solution) ～15.5W ~100ns 1.4Y 1E-10

[0038] As can be seen from Table 1, compared with the DSP solution, the power consumption, latency, and cost of the LPO solution have all decreased, but the system bit error rate has been sacrificed. Therefore, LPO technology is more dependent on interaction and adaptation with switches. Under different ports of the switch, due to different link lengths of different ports of the switch, there are also differences in the electrical port performance transmitted to the optical module, which affects the output capabilities of the driver in LPO and further affects the optical port performance of LPO.

[0039] Currently, the driver in LPO mainly adopts a fixed gain method, making it difficult for the same LPO to adapt to different ports of the same switch or different types of switches. For example, the gain of the driver adapted to a type-A switch is difficult to adapt to a type-B switch.

[0040] Regarding this problem, the related technologies mainly focus on the equalization ability of CTLE for input signals and the equalization ability of AGC for output signals. Ideally, the static output optical eye diagram can reach the optimal state. However, limited by the equalization ability of high-speed analog signals, whether it is external monitoring intervention or automatic equalization adjustment, it is difficult to ensure that the output signal is stable at the optimal state due to the changes in the link input signals of different ports of the switch.

[0041] In view of this, an embodiment of the present application provides a driver for an optical module. The optical module referred to in this embodiment is LPO. Refer to Figure 2 , Figure 2 which shows a schematic structural diagram of a driver for an optical module according to this embodiment. As Figure 2 shown, the driver 1 includes a first detection device 11, a gain control device 12, and a second detection device 13. Among them, the first detection device 11 is connected to the input end of the driver 1, and the first detection device 11 is used to detect the first signal-to-noise ratio (SNR) of the input signal of the driver 1. Specifically, the input end of the first detection device 11 is connected to the input end of the driver 1, and the output end of the first detection device 11 is connected to the input end of the regulation device 14. The first detection device 11 performs blind convergence sorting on the input signal of the driver 1 according to the analog path and calculates the first signal-to-noise ratio.

[0042] Specifically, the gain control device 12 is connected between the input end and the output end of the driver 1, and the gain control device 12 is used to perform gain amplification on the input signal of the driver 1. Among them, the input end of the gain control device 12 is connected to the input end of the driver 1, and the output end of the gain control device 12 is connected to the output end of the driver 1. Optionally, the gain control device 12 adopts a gain amplification circuit with a 2-stage feed-forward equalizer (FFE) (such as the gain control module 121 below). The gain control device 12 adopts automatic gain control and is used to provide sufficient amplification ability.

[0043] Specifically, the second detection device 13 is connected to the output end of the driver 1, and the second detection device 13 is used to detect the second signal-to-noise ratio of the output signal of the driver 1. Among them, the input end of the second detection device 13 is connected to the output end of the gain control device 12, and the output end of the second detection device 13 is connected to the output end of the driver 1. The second detection device 13 is used to perform a fine signal-to-noise ratio detection on the output signal of the driver 1.

[0044] In this embodiment, the driver 1 further includes a regulation device 14. Among them, the regulation device 14 is respectively connected to the first detection device 11, the second detection device 13, and the gain control device 12. Specifically, the input end of the regulation device 14 is respectively connected to the output ends of the first detection device 11 and the second detection device 13 to receive the first signal-to-noise ratio detected by the first detection device 11 and the second signal-to-noise ratio detected by the second detection device 13. The control end of the regulation device 14 is connected to the input end of the gain control device 12 to control the gain of the gain control device 12. Specifically, the regulation device 14 is used to adjust the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio.

[0045] Specifically, the regulation device 14 is used to adjust the gain of the gain control device 12 based on the variation relationship of the second signal-to-noise ratio with respect to the first signal-to-noise ratio, so as to dynamically adjust the feedforward pre-emphasis device and the de-emphasis device in the gain control device 12.

[0046] Furthermore, the regulation device 14 is used to adjust the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio, including: if the first signal-to-noise ratio is greater than or equal to a preset threshold, obtain the difference between the first signal-to-noise ratio and the second signal-to-noise ratio; in the case where the difference exceeds the preset difference range, adjust the gain of the gain control device 12 to reduce the difference. In the case where the difference is within the preset difference range, stop adjusting the gain of the gain control device 12.

[0047] Furthermore, the regulation device 14 is used to adjust the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio, and further includes: if both the first signal-to-noise ratio and the second signal-to-noise ratio are less than the preset threshold, adjust the gain of the gain control device to increase the second signal-to-noise ratio.

[0048] Optionally, the preset threshold is 23 dB.

[0049] In addition to the above gain adjustment method, the following gain adjustment method can also be adopted: in the case where the second signal-to-noise ratio is less than the preset threshold, adjust the gain of the gain control device to increase the second signal-to-noise ratio.

[0050] It should be noted that during the process of adjusting the gain of the gain control device, the gain of the gain control device is not adjusted without limit. Instead, through the original gain control mechanism (such as constant extinction ratio control), an initial gain is set for the gain control device. The regulation device 14 adjusts the gain of the gain control device up and down on the basis of this initial gain (that is, within the preset fluctuation range of the initial gain) to achieve a better second signal-to-noise ratio, thereby making the output signal of the driver stable.

[0051] The driver 1 for an optical module provided in this embodiment is provided with a first detection device 11 and a second detection device 13. The first detection device 11 is used to detect the first signal-to-noise ratio of the input signal of the driver 1, and the second detection device 13 is used to detect the second signal-to-noise ratio of the output signal of the driver 1, so that the regulation device 14 of the driver 1 adjusts the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio. Therefore, according to the variation relationship of the second signal-to-noise ratio with the first signal-to-noise ratio, the gain used for gain amplification by the gain control device 12 can be adjusted, so as to adjust the distortion signal to make the output of the gain control device 12 as stable as possible. When the first signal-to-noise ratio is relatively high (i.e., the input signal of the driver 1 is good), the difference between the second signal-to-noise ratio and the first signal-to-noise ratio is small. When the first signal-to-noise ratio is relatively low, the difference between the second signal-to-noise ratio and the first signal-to-noise ratio is large (i.e., making the second signal-to-noise ratio higher and the output signal of the driver 1 better), so as to ensure the stability and consistency of the output signal of the driver 1 under different input signals, thus solving the problem of large differences in the output of the driver 1 of LPO under different link conditions, and enabling the LPO using the driver 1 of the present disclosure to adapt to different switch systems and different ports of the same switch.

[0052] In some optional embodiments, the gain control device 12 is used to perform gain amplification on the input signal of the driver 1 based on the initial gain during the initialization stage of the driver 1. The regulation device 14 is further used to: during the initialization stage, adjust the gain of the gain control device 12 within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio.

[0053] Furthermore, during the initialization stage, if the second signal-to-noise ratio is less than the preset threshold, the gain of the gain control device 12 is adjusted within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio. For example, increase the gain of the gain control device 12 to increase the second signal-to-noise ratio. If the second signal-to-noise ratio is greater than or equal to the preset threshold, stop adjusting the gain of the gain control device 12.

[0054] For the driver 1 for an optical module provided in this embodiment, since the gain control device 12 itself has some characteristics (such as noise) that can affect the signal, during the initialization stage, it is necessary to adjust the gain of the gain control device 12 to increase the second signal-to-noise ratio, so as to shield the influence of the components themselves on the signal, and further improve the control accuracy of the gain control device 12. At the same time, it is necessary to control the gain of the gain control device 12 within a preset fluctuation range of the initial gain to avoid changing the output signal of the driver 1 and maintain the stability of the output signal.

[0055] In some optional embodiments, such as Figure 3As shown in the figure, the gain control device 12 includes a gain control module 121 and a feedforward equalizer 122. Among them, the input end of the gain control module 121 is respectively connected to the input end of the driver 1 and the control end of the regulation device 14, the output end of the gain control module 121 is connected to the output end of the driver 1, and the gain control module 121 is used to amplify the input signal of the driver 1 based on the gain given by the regulation device 14. The feedforward equalizer 122 is connected to the gain control module 121, and the feedforward equalizer 122 is used to perform equalization processing on the input signal of the gain control module 121.

[0056] Specifically, the feedforward equalizer 122 is connected to the input end of the gain control module 121.

[0057] Optionally, the gain control module 121 is an automatic gain control (AGC) module.

[0058] For the driver 1 used in the optical module provided in this embodiment, the feedforward equalizer 122 performs equalization processing on the input signal of the gain control module 121. Therefore, the quality of the input signal of the gain control module 121 can be improved, and thus the quality of the output signal amplified by the gain control module 121 can be improved.

[0059] In some optional embodiments, the feedforward equalizer 122 includes: filtering units corresponding to at least one frequency range, the filtering units are connected to the gain control module 121, and the filtering units are used to perform filtering processing on the signals in the corresponding frequency range of the input signal of the gain control module 121.

[0060] Specifically, at least one frequency range includes a first frequency range and a second frequency range; among them, the frequency of the first frequency range is less than the frequency of the second frequency range. The first frequency range corresponds to low-frequency signals, and the second frequency range corresponds to medium-frequency and high-frequency signals.

[0061] Specifically, the filtering units corresponding to at least one frequency range include a first filtering unit 1221 and a second filtering unit 1222. Among them, the first frequency range corresponds to the first filtering unit 1221, and the second frequency range corresponds to the second filtering unit 1222.

[0062] Further, the second frequency range includes a third frequency range and a fourth frequency range. Among them, the frequency of the third frequency range is less than the frequency of the fourth frequency range, the third frequency range corresponds to medium-frequency signals, and the fourth frequency range corresponds to high-frequency signals.

[0063] Specifically, the second filtering unit 1222 includes a first sub-filtering unit and a second sub-filtering unit. Among them, the third frequency range corresponds to the first sub-filtering unit, and the fourth frequency range corresponds to the second sub-filtering unit.

[0064] The driver 1 for the optical module provided in this embodiment is configured with filtering units in at least one frequency range in the feed-forward equalizer 122. Therefore, it can filter the input signals in different frequency ranges in the gain control module 121 to further improve the quality of the input signals of the gain control module 121.

[0065] In some alternative embodiments, the regulation device 14 is also connected to the filtering unit. The regulation device 14 is further configured to adjust the gain of the gain control device 12 within a preset fluctuation range of the initial gain during the initialization phase to increase the second signal-to-noise ratio, including: during the initialization phase of the driver 1, adjusting the gain of the gain control module 121 and the filtering parameters of the filtering unit based on the second signal-to-noise ratio and the output signals of the respective filtering units. Wherein, the adjusted gain is within the preset fluctuation range of the initial gain.

[0066] Specifically, the regulation device 14 of the present disclosure adjusts the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio only during the normal operation phase. During the initialization phase of the driver 1, the gain of the gain control module 121 and the filtering parameters of the filtering unit are adjusted based on the second signal-to-noise ratio and the output signals of the respective filtering units.

[0067] Specifically, during the initialization phase, the peak detection signal in the first frequency range of the first filtering unit 1221, the peak detection signal in the third frequency range of the first sub-filtering unit, and the peak detection signal in the fourth frequency range of the second sub-filtering unit are taken and compared with the second signal-to-noise ratio simultaneously to obtain one of the adjustment input conditions for the gain of the gain control module 121 and the filtering parameters of the respective filtering units. And during the normal operation phase, the first signal-to-noise ratio and the second signal-to-noise ratio are taken as another gain decision condition for the gain control module 121. Therefore, non-uniform control can be achieved through multi-information fusion.

[0068] For the driver 1 for the optical module provided in this embodiment, since there are some characteristics (such as noise) in the gain control module 121 and the filtering unit itself that can affect the signal, during the initialization phase, it is necessary to use the second signal-to-noise ratio and the input signals in the corresponding frequency ranges of the filtering unit in the input signals of the gain control module 121 to adjust the gain of the gain control module 121 and the filtering parameters of the filtering unit, so as to shield the influence of the components themselves on the signal, improve the control accuracy of the gain control device 12, and further improve the output signal quality of the driver 1.

[0069] In some alternative embodiments, such as Figure 4As shown, the gain control module 121 includes a first gain unit 1211 and a second gain unit 1212. Among them, the input end of the first gain unit 1211 is respectively connected to the output end of the feed-forward equalizer 122 and the control end of the regulation device 14. The first gain unit 1211 is used to perform a first-stage gain amplification on the input signal of the driver 1 based on the first gain given by the regulation device 14 to obtain a first-stage amplified signal. The input end of the second gain unit 1212 is respectively connected to the output end of the first gain unit 1211 and the control end of the regulation device 14. The output end of the second gain unit 1212 is connected to the output end of the driver 1. The second gain unit 1212 is used to perform a second-stage gain amplification on the first-stage amplified signal based on the second gain given by the regulation device 14.

[0070] Specifically, the second gain unit 1212 is used to perform a second-stage gain amplification on the first-stage amplified signal based on the second gain given by the regulation device 14 to obtain the output signal of the driver 1. Among them, as Figure 4 shown, an output buffer 17 is provided between the second gain unit 1212 and the output end of the driver 1. The input end of the output buffer 17 is connected to the output end of the second gain unit 1212. The output end of the output buffer 17 is respectively connected to the output end of the driver 1, the input end of the second detection device 13, and the input end of the regulation device 14. The output buffer 17 is used to amplify the signal output by the second gain unit 1212 to obtain the output signal of the driver 1.

[0071] Optionally, the first gain unit 1211 and the second gain unit 1212 adopt an automatic gain control (AGC) unit.

[0072] It can be understood that since the gain brought by a single gain unit is small, in actual situations, multiple gain units need to be configured according to the actual situation, such as the first gain unit 1211 and the second gain unit 1212, so as to provide a larger gain regulation range. In actual situations, in addition to configuring the first gain unit 1211 and the second gain unit 1212, a third gain unit can also be configured in the gain control module 121 to perform gain amplification on the input signal of the driver 1 stage by stage.

[0073] Furthermore, an analog front end (AFE) is provided in both the first gain unit 1211 and the second gain unit 1212. Among them, the analog front end includes a pre-emphasis and a de-emphasis.

[0074] Optionally, the first gain unit 1211 includes a first analog front end and a first variable gain amplifier (VGA).

[0075] Optionally, the second gain unit 1212 includes a second analog front end and a second variable gain amplifier.

[0076] For the driver 1 for an optical module provided in this embodiment, two-stage gain units are provided in the gain control module 121. Therefore, a larger gain adjustment range can be provided.

[0077] In some alternative embodiments, as Figure 5 shown, the feed-forward equalizer 122 includes a first filtering unit 1221 and a second filtering unit 1222. Among them, the first filtering unit 1221 is connected to the first gain unit 1211, and the first filtering unit 1221 is configured to filter the signal in the first frequency range in the input signal of the first gain unit 1211. The second filtering unit 1222 is connected to the second gain unit 1212, and the second filtering unit 1222 is configured to filter the signal in the second frequency range in the input signal of the second gain unit 1212, and the frequency of the first frequency range is less than the frequency of the second frequency range.

[0078] Optionally, as Figure 6 shown, the first filtering unit 1221 includes a first capacitor C1, a first resistor R1, and a second resistor R2. Among them, the first capacitor C1 is connected in series with the first resistor R1, and the second resistor R2 is connected in parallel with the circuit where the first capacitor C1 and the first resistor R1 are located.

[0079] Optionally, the first capacitor C1 is a variable capacitor, and the first resistor R1 is a variable resistor.

[0080] Optionally, as Figure 6 shown, the second filtering unit 1222 includes a second capacitor C2, a third capacitor C3, a third resistor R3, and a fourth resistor R4. Among them, the second capacitor C2, the third capacitor C3, and the fourth resistor R4 are connected in parallel, and the second capacitor C2 is connected in series with the third resistor R3.

[0081] Optionally, the second capacitor C2 and the third capacitor C3 are variable capacitors, and the fourth resistor R4 is a variable resistor.

[0082] It should be noted that the first filtering unit 1221 is attached to the first variable gain amplifier of the first gain unit 1211, and the second filtering unit 1222 is attached to the second variable gain amplifier of the second gain unit 1212.

[0083] The driver 1 for an optical module provided in this embodiment, the feed-forward equalizer 122 includes a first filtering unit 1221 in a first frequency range and a second filtering unit 1222 in a second frequency range. Among them, the first filtering unit 1221 is connected to the first gain unit 1211, and the second filtering unit 1222 is connected to the second gain unit 1212. Therefore, it is possible to perform adaptive filtering processing on signals for gain amplification in different frequency ranges to ensure the effectiveness of the filtering processing.

[0084] In some alternative embodiments, as Figure 4 shown, the driver 1 further includes a baseline wander correction device (BLWC) 16. The baseline wander correction device 16 is disposed between the input end of the driver 1 and the gain control device 12, and the baseline wander correction device 16 is used to perform baseline wander correction on the input signal of the driver 1.

[0085] Specifically, the input end of the baseline wander correction device 16 is respectively connected to the input end of the driver 1 and the input end of the first detection device 11, and the output end of the baseline wander correction device 16 is connected to the input end of the gain control device 12.

[0086] Specifically, as Figure 6 shown, the input end of the driver 1 is connected with a fourth capacitor C4 and a fifth capacitor C5, and the fourth capacitor C4 and the fifth capacitor C5 are in parallel. The baseline wander correction device 16 is adapted to the pre-input impedance (i.e., the fourth capacitor C4 and the fifth capacitor C5).

[0087] The driver 1 for an optical module provided in this embodiment, the baseline wander correction device 16 additionally incorporates an internal intermediate frequency local oscillator (VCO) to form a micro delay line and a peak noise detector to detect baseline wander. Therefore, it is possible to compensate for the DC component or low-frequency drift in the input signal of the driver 1, thereby maintaining the integrity and accuracy of the input signal and optimizing the background noise of the input signal of the driver 1.

[0088] In some alternative embodiments, as Figure 4 shown, the driver 1 further includes a linear equalizer 15. The input end of the linear equalizer 15 is connected to the input end of the driver 1, and the output end of the linear equalizer 15 is respectively connected to the input ends of the first detection device 11 and the gain control device 12. The linear equalizer 15 is used to perform pre-distortion processing on the input signal of the driver 1.

[0089] Optionally, the linear equalizer 15 is a continuous-time linear equalizer.

[0090] Further, the linear equalizer 15 is used to perform pre-distortion processing on the input signal of the driver 1, including: the linear equalizer 15 performs pre-distortion processing in the full bandwidth range in the manner of a digital signal to compensate for the influence of the channel on the input signal.

[0091] For the driver 1 for an optical module provided in this embodiment, a linear equalizer 15 is configured at the input end of the driver 1. Therefore, the influence of the channel on the input signal can be compensated by using the linear equalizer 15.

[0092] As one specific example, as Figure 6 shown, the driver 1 for an optical module of the present disclosure includes an input end element, a control end element, and an output end element. The input end element includes impedance matching (see the fourth capacitor C4 and the fifth capacitor C5 shown in Figure 6 ), a linear equalizer 15, a baseline drift correction device 16, and a first detection device 11. The input end element is used for input adaptation and filtering detection. The control end element includes a first filtering unit 1221, a second filtering unit 1222, a first variable gain amplifier, a second variable gain amplifier, a first analog front end, a second analog front end, and a regulation device 14. The control end element is used to implement peak detection of low-frequency, intermediate-frequency, and high-frequency input signals, calibrate the parameters of the feed-forward equalizer 122 based on the detection signal, and control the gains of the first variable gain amplifier and the second variable gain amplifier. The output end element includes an output buffer 17 and a second detection device 13. The output end element is used to perform signal amplification, output matching, and second signal-to-noise ratio detection on the signal output by the control end element.

[0093] It is worth noting that in the related art, the principle of the variable gain amplifier of the driver is to scale the intermediate frequency and provide gain adjustment, and a first-stage peak detector (PKD) is used to achieve gain linear equalization amplification. Among them, see the gains in different frequency ranges shown in Figure 7 . It can be seen that when the related art simultaneously amplifies low-frequency, intermediate-frequency, and high-frequency signals, the noise suppression ability is poor. After using the driver 1 for an optical module of the present disclosure, see Figure 8The gain Gain1.Pre-em of the pre-emphasis unit of the first gain unit 1211 shown in [Figure 0], the gain Gain2.De-em of the de-emphasis unit of the second gain unit 1212, the gain Gain2.Pre-em of the pre-emphasis unit of the second gain unit 1212, and the sum value Gain1.Pre-em + Gain2.De-em of the gain of the pre-emphasis unit of the first gain unit 1211 and the gain of the de-emphasis unit of the second gain unit 1212; wherein, Gain1.Pre-em + Gain2.De-em is the desired result of the driver 1 of the present disclosure. From Gain1.Pre-em + Gain2.De-em, it can be seen that the output signal of the driver 1 adopted by the present disclosure is smooth and stable under input signals of different frequencies.

[0094] Exemplarily, the extinction ratios of an 800G LPO module using related technologies and an 800G LPO module using the driver 1 for an optical module of the present disclosure are simulated, and the Figure 9 and Figure 10 shown extinction ratio distribution diagrams are obtained respectively. Among them, Figure 9 is the extinction ratio distribution diagram (Extinction Ratio, ER) of an 800G LPO module using related technologies, Figure 10 is the extinction ratio distribution diagram of an 800G LPO module using the driver 1 for an optical module of the present disclosure. It can be seen from Figure 9 that for different channels (such as CH1 to CH8) of the same port of an 800G LPO module using related technologies, the ER distribution has a relatively large discreteness. And it can be seen from Figure 10 that the extinction ratio distribution of the 800G LPO module using the present disclosure is relatively convergent. After adopting the driver 1 with automatic gain control based on signal-to-noise ratio of the present disclosure, the output of the driver 1 of the LPO module reaches a high degree of consistency. Thus, it can be seen that the driver 1 of the present disclosure can solve the problems of output deviation of the driver 1 and optical performance deviation caused by the deviation under the condition of inconsistent electrical port characteristics of different ports of the LPO module.

[0095] In this embodiment, a control method for a driver 1 of an optical module is further provided, which is applied to a regulation device 14 in the driver 1. The regulation device 14 is respectively connected to a first detection device 11, a gain control device 12, and a second detection device 13 of the driver 1. Among them, the first detection device 11 is used to detect the first signal-to-noise ratio of the input signal of the driver 1; the gain control device 12 is used to perform gain amplification on the input signal of the driver 1; the second detection device 13 is used to detect the second signal-to-noise ratio of the output signal of the driver 1. The relevant description of the driver 1 can refer to the above embodiment and will not be elaborated here. The flow of a control method for a driver 1 of an optical module according to an embodiment of the present disclosure includes the following steps: adjusting the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio.

[0096] In some alternative embodiments, the gain control device 12 is used to perform gain amplification on the input signal of the driver 1 based on an initial gain during the initialization stage of the driver 1. The control method of the present disclosure further includes: during the initialization stage, adjusting the gain of the gain control device 12 within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio.

[0097] Further, the above adjusting the gain of the gain control device 12 within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio includes: if the second signal-to-noise ratio is less than a preset threshold, adjusting the gain of the gain control device 12 within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio. If the second signal-to-noise ratio is greater than or equal to the preset threshold, stop adjusting the gain of the gain control device 12.

[0098] In some other alternative embodiments, the gain control device 12 includes a gain control module 121 and a feed-forward equalizer 122. The gain control module 121 is used to perform gain amplification on the input signal of the driver 1 based on the gain given by the regulation device 14. The feed-forward equalizer 122 is used to perform equalization processing on the input signal of the gain control module 121.

[0099] Specifically, the feed-forward equalizer 122 includes at least one filtering unit corresponding to a frequency range. The filtering unit is used to perform filtering processing on the signal in the corresponding frequency range of the input signal of the gain control module 121.

[0100] Further, the regulation device 14 is also connected to the filtering unit. The above adjusting the gain of the gain control device 12 within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio includes: during the initialization stage of the driver 1, adjusting the gain of the gain control module 121 and the filtering parameters of the filtering unit based on the second signal-to-noise ratio and the output signals of the respective filtering units. Among them, the adjusted gain is within the preset fluctuation range of the initial gain.

[0101] In the normal operation stage of the control method of this embodiment, the gain of the gain control device 12 is adjusted based on the first signal-to-noise ratio and the second signal-to-noise ratio.

[0102] In some optional embodiments, adjusting the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio includes: if the first signal-to-noise ratio is greater than or equal to a preset threshold, obtaining the difference between the first signal-to-noise ratio and the second signal-to-noise ratio; in the case where the difference exceeds a preset difference range, adjusting the gain of the gain control device 12 to reduce the difference.

[0103] For example, in the case where the difference between the first signal-to-noise ratio and the second signal-to-noise ratio exceeds the preset difference range, increasing the gain of the gain control device 12 to increase the second signal-to-noise ratio. In practical applications, in order to maintain the stability of the output signal of the driver 1, the increased gain needs to be within a preset fluctuation range of the initial gain.

[0104] Further, when the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is within the preset difference range, the adjustment of the gain of the gain control device 12 is stopped.

[0105] In some optional embodiments, adjusting the gain of the gain control device 12 based on the first signal-to-noise ratio and the second signal-to-noise ratio further includes: if both the first signal-to-noise ratio and the second signal-to-noise ratio are less than the preset threshold, adjusting the gain of the gain control device 12 to increase the second signal-to-noise ratio.

[0106] For example, if both the first signal-to-noise ratio and the second signal-to-noise ratio are less than the preset threshold, increasing the gain of the gain control device 12 to increase the second signal-to-noise ratio.

[0107] It can be understood that if the first signal-to-noise ratio is less than the preset threshold, it indicates that the quality of the input signal is poor. At this time, it is necessary to adjust the gain of the gain control device 12 to increase the second signal-to-noise ratio, thereby improving the quality of the output signal.

[0108] Further, if the second signal-to-noise ratio is greater than or equal to the preset threshold, the adjustment of the gain of the gain control device 12 is stopped.

[0109] Optionally, the preset threshold is 23 dB.

[0110] It should be noted that the overall control process of the control method of the present disclosure is as follows: In the initialization stage of the driver 1, the gain control device 12 amplifies the input signal of the driver 1 with an initial gain. At the same time, the second detection device 13 detects the second signal-to-noise ratio of the output signal of the driver 1. Within the preset fluctuation range of the initial gain, the gain of the gain control device 12 is adjusted to increase the second signal-to-noise ratio so that the second signal-to-noise ratio is greater than a preset threshold (such as 23 dB). In the normal operation stage, the gain control device 12 amplifies the input signal of the driver 1 with the gain determined in the initialization stage. At the same time, the first detection device 11 detects the first signal-to-noise ratio of the input signal of the driver 1, and the second detection device 13 continues to detect the second signal-to-noise ratio of the output signal of the driver 1. If the first signal-to-noise ratio is greater than or equal to the preset threshold, when the difference between the first signal-to-noise ratio and the second signal-to-noise ratio exceeds the preset difference range, the gain of the gain control device 12 is adjusted to reduce the difference until the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is within the preset difference range. If both the first signal-to-noise ratio and the second signal-to-noise ratio are less than the preset threshold, the gain of the gain control device 12 is adjusted to increase the second signal-to-noise ratio until the second signal-to-noise ratio is greater than or equal to the preset threshold.

[0111] The embodiment of the present disclosure also provides an optical module, such as Figure 11 shown, the optical module includes an input device 3, the driver 1 in the above embodiment, and a laser 2.

[0112] Specifically, the input device 3 is used to connect to a switch. Among them, the input device is a gold finger.

[0113] Specifically, the input end of the driver 1 is connected to the input device 3. Among them, the relevant description of the driver 1 can refer to the description of the driver 1 for the optical module above, and will not be elaborated here.

[0114] Specifically, the driving end of the laser 2 is connected to the output end of the driver 1, and the laser 2 is used to emit an optical signal under the drive of the output signal of the driver 1.

[0115] Optionally, the laser 2 can adopt lasers such as a vertical cavity surface emitting laser 2 (Vertical-Cavity Surface-Emitting Laser, VCSEL), an electro-absorption modulated laser 2 (Electro-Absorption Modulated Laser, EML), and a Mach-Zehnder modulator (Mach-Zehnder Modulator, MZM).

[0116] Although embodiments of the present disclosure have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A driver for an optical module, characterized in that: The driver comprises: A first detection device, connected to an input terminal of the driver, and used for detecting a first signal-to-noise ratio of an input signal of the driver; A gain control device, the gain control device is connected between the input end of the driver and the output end of the driver, and the gain control device is used to perform gain amplification on the input signal of the driver; a second detection device, the second detection device being connected to the output end of the driver, and the second detection device being used to detect a second signal-to-noise ratio of the output signal of the driver; A control device, wherein the control device is connected to the first detection device, the second detection device and the gain control device respectively, and the control device is used to adjust the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio.

2. The driver according to claim 1, characterized in that: The gain control device is used to amplify the input signal of the driver based on the initial gain during the initialization phase of the driver; the regulating device is also used to: In the initialization stage, the gain of the gain control device is adjusted within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio.

3. The driver according to claim 1, characterized in that: The gain control device comprises: A gain control module, wherein the input end of the gain control module is respectively connected to the input end of the driver and the control end of the regulating device, the output end of the gain control module is connected to the output end of the driver, and the gain control module is used to perform gain amplification on the input signal of the driver based on the gain given by the regulating device; A feedforward equalizer, the feedforward equalizer is connected to the gain control module, and the feedforward equalizer is used to perform equalization processing on the input signal of the gain control module.

4. The driver according to claim 3, characterized in that: The feedforward equalizer comprises: At least one filtering unit corresponding to a frequency range, the filtering unit being connected to the gain control module, and the filtering unit being used for filtering a signal corresponding to a frequency range in an input signal of the gain control module.

5. The driver according to claim 3, characterized in that: The gain control module comprises: A first gain unit, wherein an input end of the first gain unit is respectively connected to an output end of the feedforward equalizer and a control end of the regulating device, and the first gain unit is used to perform a first-stage gain amplification on an input signal of the driver based on a first gain given by the regulating device to obtain a first-stage amplified signal; A second gain unit, wherein the input end of the second gain unit is respectively connected to the output end of the first gain unit and the control end of the regulating device, the output end of the second gain unit is connected to the output end of the driver, and the second gain unit is used to perform secondary gain amplification on the primary amplified signal based on a second gain given by the regulating device.

6. The driver according to claim 5, characterized in that: The feedforward equalizer comprises: A first filtering unit, the first filtering unit is connected to the first gain unit, and the first filtering unit is used to filter a signal in a first frequency range in an input signal of the first gain unit; A second filtering unit, the second filtering unit is connected to the second gain unit, and the second filtering unit is used to filter the signal in the second frequency range in the input signal of the second gain unit, and the frequency in the first frequency range is smaller than the frequency in the second frequency range.

7. The driver according to claim 1, characterized in that: The driver further comprises: A baseline drift correction device is provided between the input end of the driver and the gain control device, and is used for performing baseline drift correction on the input signal of the driver.

8. The driver according to claim 1, characterized in that: The driver further comprises: A linear equalizer, wherein the input end of the linear equalizer is connected to the input end of the driver, the output end of the linear equalizer is respectively connected to the input end of the first detection device and the input end of the gain control device, and the linear equalizer is used to perform pre-distortion processing on the input signal of the driver.

9. A control method for a driver of an optical module, characterized in that: A control device applied to a driver, the control device is connected to a first detection device, a gain control device and a second detection device of the driver respectively; wherein the first detection device is used to detect a first signal-to-noise ratio of an input signal of the driver; the gain control device is used to perform gain amplification on the input signal of the driver; the second detection device is used to detect a second signal-to-noise ratio of an output signal of the driver; the method comprises: The gain of the gain control device is adjusted based on the first signal-to-noise ratio and the second signal-to-noise ratio.

10. The control method according to claim 9, characterized in that: The adjusting the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio includes: If the first signal-to-noise ratio is greater than or equal to a preset threshold, obtaining a difference between the first signal-to-noise ratio and the second signal-to-noise ratio; When the difference exceeds a preset difference range, the gain of the gain control device is adjusted to reduce the difference.

11. The control method according to claim 9, characterized in that: The adjusting the gain of the gain control device based on the first signal-to-noise ratio and the second signal-to-noise ratio includes: If both the first signal-to-noise ratio and the second signal-to-noise ratio are smaller than a preset threshold, the gain of the gain control device is adjusted to increase the second signal-to-noise ratio.

12. The control method according to claim 9, characterized in that: The gain control device is used to perform gain amplification on the input signal of the driver based on the initial gain during the initialization phase of the driver; the method further includes: In the initialization stage, the gain of the gain control device is adjusted within a preset fluctuation range of the initial gain to increase the second signal-to-noise ratio.

13. An optical module, characterized in that: include: An input device, used for connecting to a switch; The driver according to any one of claims 1 to 8; A laser, wherein a driving end of the laser is connected to an output end of the driver, and the laser is used to emit an optical signal under the drive of an output signal of the driver.

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