Optical module

Abstract

The optical module provided by the invention is provided with a coherent component which is used for receiving local oscillation light and a first optical signal and carrying out coherent demodulation on the local oscillation light and the first optical signal. And the receiving photoelectric detector generates photo-generated current for the first optical signal. The trans-impedance amplifier receives the photo-generated current, amplifies the photo-generated current and outputs a voltage signal. The analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to an MCU formula, the AD sampling value is substituted into a reference optical power formula to calculate and obtain a reference optical power value, and the current frequency value is substituted into a frequency deviation formula to calculate and obtain the current frequency deviation. And subtracting the current frequency deviation from the reference optical power value to obtain an optical power calculation value as reported optical power. The current frequency deviation is subtracted from the optical power calculation value on the basis of the reference optical power value, so that the calculated optical power is closer to the actual optical power, and the accuracy of the reported optical power is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an optical module. Background Art

[0002] Optical communication technology is used in new business models and applications such as cloud computing, mobile internet, and video. In optical communications, optical modules are tools for converting optical and electrical signals and are key components in optical communication equipment. With the rapid development of 5G networks, optical modules, at the core of optical communications, have experienced significant development.

[0003] Coherent optical modules divide the optical frequency band into multiple channels based on frequency, fully utilizing the optical frequency band and enabling multi-channel fiber-optic communication. In actual applications, the operating temperature and transmit / receive frequency of coherent optical modules vary depending on the application environment and requirements. However, the responsivity of photodetectors also varies with frequency and temperature. That is, for the same optical power, the photodetector generates different photogenerated currents at different frequencies and temperatures, resulting in different sampled voltages, which affects the reported optical power of the coherent optical module. Summary of the Invention

[0004] The present application provides an optical module to improve the optical power reporting accuracy of the optical module.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] In one aspect, an embodiment of the present application discloses an optical module, comprising:

[0007] a coherent component that receives the local oscillator light and the first optical signal and performs coherent demodulation on the local oscillator light and the first optical signal; and a receiving photodetector that generates a photocurrent in response to the first optical signal.

[0008] a transimpedance amplifier, receiving the photogenerated current, amplifying the photogenerated current, and outputting a voltage signal;

[0009] An analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to the MCU;

[0010] The MCU calculates and reports the optical power according to the AD sampling value, the frequency of the first optical signal, and an optical power formula;

[0011] The optical power formula is: P = P1 - P2 (1);

[0012] In formula (1), P1 is the reference optical power, and P2 is the current frequency deviation;

[0013] The reference optical power is a functional relationship between the AD sampling value and the reference optical power when the frequency of the first optical signal is the first frequency and the temperature is the first temperature;

[0014] The frequency deviation is a functional relationship between the frequency difference and the frequency at the first temperature, wherein the frequency difference is the difference between the optical power corresponding to different frequencies and the reference optical power.

[0015] On the other hand, an embodiment of the present application discloses an optical module, including:

[0016] a coherent component that receives the local oscillator light and the first optical signal, and coherently demodulates the local oscillator light and the first optical signal to generate a photogenerated current;

[0017] a transimpedance amplifier, receiving the photogenerated current, amplifying the photogenerated current, and outputting a voltage signal;

[0018] An analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to the MCU;

[0019] A temperature collector is connected to the MCU and collects the temperature of the relevant components;

[0020] The MCU calculates and reports the optical power according to the AD sampling value, the frequency of the first optical signal, and an optical power formula;

[0021] The optical power formula is: P = P1-P2-P3 (5);

[0022] In formula (1), P1 is the reference optical power, P2 is the current frequency deviation, and P3 is the current temperature deviation.

[0023] The reference optical power is a functional relationship formula between the AD sampling value and the reference optical power when the frequency of the first optical signal is the first frequency at the first temperature.

[0024] The frequency deviation is a functional relationship between the frequency difference and the frequency at the first temperature, where the frequency difference is the difference between the optical power corresponding to different frequencies and the reference optical power;

[0025] The frequency deviation is a functional relationship between a frequency difference and temperature at the first frequency, and the frequency difference is a difference between optical powers corresponding to different temperature rates and a reference optical power.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The optical module provided in the present application has a coherent component, receives the local oscillator light and the first optical signal, and coherently demodulates the local oscillator light and the first optical signal, and receives the photoelectric detector to generate photocurrent power for the first optical signal. The transimpedance amplifier receives the photocurrent, amplifies the photocurrent and outputs a voltage signal. The analog-to-digital conversion sampler converts the voltage signal into an AD sampling value, and passes the AD sampling value to the MCU formula. The reference optical power value is calculated by substituting the AD sampling value into the reference optical power formula, and the current frequency deviation is calculated by substituting the current frequency value into the frequency deviation formula. The optical power calculation value is obtained by subtracting the current frequency deviation from the reference optical power value as the reported optical power. The optical power calculation value is based on the reference optical power value and subtracts the current frequency deviation, so that the calculated optical power is closer to the actual optical power, thereby improving the accuracy of the reported optical power. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0029] Figure 1 is a partial architecture diagram of an optical communication system according to some embodiments;

[0030] Figure 2 is a partial structural diagram of a host computer according to some embodiments;

[0031] Figure 3 is a structural diagram of an optical module according to some embodiments;

[0032] Figure 4 is an exploded view of an optical module according to some embodiments;

[0033] Figure 5 A structural diagram of an optical module with a housing and unlocking components removed according to some embodiments;

[0034] Figure 6 is a structural diagram of a fiber optic adapter, a light source, a coherent component, and a circuit board according to some embodiments;

[0035] Figure 7 A simplified structural diagram of a light receiving component provided according to some embodiments of the present disclosure;

[0036] Figure 8 is a data graph corresponding to the sampling values ​​of the sampled values ​​and the reference optical power in Table 1;

[0037] Figure 9 is the frequency deviation curve shown according to the data in Table 2;

[0038] Figure 10 This is the temperature deviation curve based on the data in Table 3. DETAILED DESCRIPTION

[0039] Optical communication technology enables information transmission between information processing devices. It loads information onto light and uses the propagation of light to achieve this transmission. Light loaded with information is an optical signal. The propagation of optical signals within information transmission equipment reduces optical power loss, enabling high-speed, long-distance, and low-cost information transmission. The information processed by information processing equipment exists in the form of electrical signals. Optical network terminals / gateways, routers, switches, mobile phones, computers, servers, tablets, and televisions are common information processing devices, and optical fibers and optical waveguides are common information transmission devices.

[0040] The conversion of optical signals and electrical signals between information processing equipment and information transmission equipment is achieved through optical modules. For example, an optical fiber is connected to the optical signal input end and / or optical signal output end of the optical module, and an optical network terminal is connected to the electrical signal input end and / or electrical signal output end of the optical module. A first optical signal from the optical fiber is transmitted into the optical module, and the optical module converts the first optical signal into a first electrical signal, which is then transmitted into the optical network terminal. A second electrical signal from the optical network terminal is transmitted into the optical module, and the optical module converts the second electrical signal into a second optical signal, which is then transmitted into the optical fiber. Since information processing devices can be connected to each other through an electrical signal network, at least one type of information processing device needs to be directly connected to the optical module, and not all types of information processing devices need to be directly connected to the optical module. The information processing device directly connected to the optical module is called the host computer of the optical module.

[0041] Figure 1 FIG. 1 is a partial architecture diagram of an optical communication system according to some embodiments. Figure 1 As shown, a part of the optical communication system is presented as a remote information processing device 1000 , a local information processing device 2000 , a host computer 100 , an optical module 200 , an optical fiber 101 and a network cable 103 .

[0042] One end of optical fiber 101 extends toward remote information processing device 1000, and the other end connects to the optical interface of optical module 200. Optical signals can undergo total internal reflection within optical fiber 101, maintaining nearly their original optical power as they propagate in the direction of total internal reflection. Multiple total internal reflections within optical fiber 101 transmit optical signals from the direction of remote information processing device 1000 into optical module 200, or transmit light from optical module 200 toward remote information processing device 1000, enabling long-distance, low-power information transmission.

[0043] The number of optical fibers 101 may be one or more (two or more); the optical fiber 101 and the optical module 200 may be connected in a pluggable movable manner or in a fixed manner.

[0044] The host computer 100 has an optical module interface 102, which is configured to connect to the optical module 200, so that the host computer 100 establishes a unidirectional / bidirectional electrical signal connection with the optical module 200; the host computer 100 is configured to provide data signals to the optical module 200, or receive data signals from the optical module 200, or monitor and control the working status of the optical module 200.

[0045] The host computer 100 has an external electrical interface, such as a Universal Serial Bus (USB) interface and a network cable interface 104, which can be connected to an electrical signal network. For example, the network cable interface 104 is configured to connect to a network cable 103, thereby establishing a unidirectional / bidirectional electrical signal connection between the host computer 100 and the network cable 103.

[0046] Optical Network Unit (ONU), Optical Line Terminal (OLT), Optical Network Equipment (ONT) and data center servers are common host computers.

[0047] One end of the network cable 103 is connected to the local information processing device 2000 , and the other end is connected to the host computer 100 . The network cable 103 establishes an electrical signal connection between the local information processing device 2000 and the host computer 100 .

[0048] For example, the third electrical signal emitted by the local information processing device 2000 is transmitted to the host computer 100 through the network cable 103. The host computer 100 generates a second electrical signal based on the third electrical signal. The second electrical signal from the host computer 100 is transmitted into the optical module 200. The optical module 200 converts the second electrical signal into a second optical signal. The optical module 200 transmits the second optical signal into the optical fiber 101. The second optical signal is transmitted to the remote information processing device 1000 in the optical fiber 101.

[0049] For example, a first optical signal from the direction of the remote information processing device 1000 propagates through the optical fiber 101, the first optical signal from the optical fiber 101 is transmitted into the optical module 200, the optical module 200 converts the first optical signal into a first electrical signal, the optical module 200 transmits the first electrical signal into the host computer 100, the host computer 100 generates a fourth electrical signal based on the first electrical signal, and the host computer 100 transmits the fourth electrical signal to the local information processing device 2000.

[0050] Optical modules are tools for converting optical signals into electrical signals. During this conversion process, the information remains unchanged, but the encoding and decoding methods of the information can change.

[0051] Figure 2 FIG1 is a partial structural diagram of a host computer according to some embodiments. In order to clearly show the connection relationship between the optical module 200 and the host computer 100, Figure 2 Only the structures related to the host computer 100 and the optical module 200 are shown. Figure 2 As shown, the host computer 100 also includes a PCB circuit board 105 arranged in the shell, a cage 106 arranged on the surface of the PCB circuit board 105, a heat sink 107 arranged on the cage 106, and an electrical connector (not shown in the figure) arranged inside the cage 106. The heat sink 107 has a protruding structure that increases the heat dissipation area, and a fin-shaped structure is a common protruding structure.

[0052] Optical module 200 is inserted into cage 106 of host computer 100. Cage 106 secures optical module 200, and heat generated by optical module 200 is transferred to cage 106 and then dissipated through heat sink 107. After optical module 200 is inserted into cage 106, the electrical interface of optical module 200 connects to the electrical connector inside cage 106.

[0053] Figure 3 is a structural diagram of an optical module according to some embodiments. Figure 4 is an exploded view of an optical module according to some embodiments. Figure 5 FIG. 1 is a structural diagram of an optical module with the housing and unlocking components removed according to some embodiments. Figure 6 FIG is a structural diagram of a fiber optic adapter, a light source, coherent components, and a circuit board according to some embodiments. Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the optical module 200 includes a housing, a circuit board 300 disposed in the housing, a light emitting component 400, and a light receiving component 500. However, the present disclosure is not limited thereto. In some embodiments, the optical module 200 includes one of the light emitting component 400 and the light receiving component 500.

[0054] The housing includes an upper housing 201 and a lower housing 202 . The upper housing 201 covers the lower housing 202 to form the housing having two openings 204 and 205 . The outer contour of the housing is generally a square.

[0055] In some embodiments, the lower shell 202 includes a base plate 2021 and two lower side plates 2022 located on both sides of the base plate 2021 and arranged perpendicular to the base plate 2021; the upper shell 201 includes a cover plate 2011, and the cover plate 2011 covers the two lower side plates 2022 of the lower shell 202 to form the above-mentioned shell.

[0056] In some embodiments, the lower shell 202 includes a base plate 2021 and two lower side plates 2022 located on both sides of the base plate 2021 and arranged perpendicularly to the base plate 2021; the upper shell 201 includes a cover plate 2011 and two upper side plates located on both sides of the cover plate 2011 and arranged perpendicularly to the cover plate 2011. The two upper side plates are combined with the two lower side plates 2022 to achieve the upper shell 201 covering the lower shell 202.

[0057] The direction of the line connecting the two openings 204 and 205 may be consistent with the length direction of the optical module 200, or may be inconsistent with the length direction of the optical module 200. For example, the opening 204 is located at the end of the optical module 200 ( Figure 3 The opening 205 is also located at the end of the optical module 200 ( Figure 3 Alternatively, opening 204 is located at the end of optical module 200, while opening 205 is located on the side of optical module 200. Opening 204 is an electrical interface, through which the gold fingers of circuit board 300 extend and are inserted into the electrical connector of the host computer; opening 205 is an optical port, configured to receive optical fiber 101, thereby connecting optical fiber 101 to the optical emitting component 400 and / or optical receiving component 500 in optical module 200.

[0058] The combined assembly of the upper and lower housings 201 and 202 facilitates the installation of components such as the circuit board 300, light emitting component 400, and light receiving component 500 within the housings. These components are encapsulated and protected by the upper and lower housings 201 and 202. Furthermore, during assembly of the circuit board 300, light emitting component 400, and light receiving component 500, positioning components, heat dissipation components, and electromagnetic shielding components are easily positioned, facilitating automated production.

[0059] In some embodiments, the upper shell 201 and the lower shell 202 are made of metal materials, which facilitates electromagnetic shielding and heat dissipation.

[0060] In some embodiments, the optical module 200 further includes an unlocking component 600 located outside its housing. The unlocking component 600 is configured to achieve a fixed connection between the optical module 200 and the host computer, or to release the fixed connection between the optical module 200 and the host computer.

[0061] For example, the unlocking member 600 is located on the outside of the two lower side panels 2022 of the lower housing 202 and includes engaging components that mate with the cage 106 of the host computer. When the optical module 200 is inserted into the cage 106, the engaging components of the unlocking member 600 secure the optical module 200 within the cage 106. When the unlocking member 600 is pulled, the engaging components of the unlocking member 600 move accordingly, thereby changing the connection between the engaging components and the host computer, thereby releasing the fixed engagement between the optical module 200 and the host computer, allowing the optical module 200 to be removed from the cage 106.

[0062] The circuit board 300 includes circuit traces, electronic components, and chips. The electronic components and chips are connected together according to the circuit design through the circuit traces to achieve functions such as power supply, electrical signal transmission, and grounding. Electronic components may include, for example, capacitors, resistors, transistors, and metal-oxide-semiconductor field-effect transistors (MOSFETs). Chips may include, for example, microcontroller units (MCUs), laser driver chips, transimpedance amplifiers (TIAs), limiting amplifiers, clock and data recovery chips (CDRs), power management chips, and digital signal processing (DSP) chips.

[0063] The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the load-bearing function. For example, the rigid circuit board can stably carry the above-mentioned electronic components and chips; the rigid circuit board is also easy to insert into the electrical connector in the upper computer cage.

[0064] The circuit board 300 also includes a gold finger formed on its end surface. The gold finger is composed of a plurality of independent pins. The circuit board 300 is inserted into the cage 106, and the gold finger is connected to the electrical connector in the cage 106. The gold finger can be set on the surface of only one side of the circuit board 300 (for example, Figure 4 The gold fingers are configured to establish electrical connections with a host computer to achieve power supply, grounding, I2C signal transmission, data signal transmission, etc.

[0065] Of course, flexible circuit boards are also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards to supplement rigid circuit boards.

[0066] The light emitting component and / or the light receiving component are located on the side of the circuit board 300 away from the gold finger; in some embodiments, the light emitting component and the light receiving component are physically separated from the circuit board 300, and then electrically connected to the circuit board 300 through corresponding flexible circuit boards or electrical connectors; in some embodiments, the light emitting component and / or the light receiving component can be directly set on the circuit board 300, can be set on the surface of the circuit board, and can also be set on the side of the circuit board.

[0067] The circuit board 300 includes a first circuit board 301, a second circuit board 302 and a third circuit board 303. The first circuit board 301 and the second circuit board 302 are both rigid circuit boards, and the third circuit board 303 is a flexible circuit board. The second circuit board 302 is stacked and placed on one end of the first circuit board 301 close to the local oscillator light source 401. The second circuit board 302 is located between the first circuit board 301 and the upper shell 201. The first circuit board 301 and the second circuit board 302 are connected through the third circuit board 303.

[0068] Local oscillator light source 401 is connected to second circuit board 302 and is configured to emit a light beam of a preset specific wavelength. Specifically, local oscillator light source 401 includes a semiconductor gain chip and a silicon photonics chip. The semiconductor gain chip emits a light beam within a wavelength range, while the silicon photonics chip selects a light beam of a specific wavelength from the light beam within the wavelength range. The silicon photonics chip and the semiconductor gain chip form a resonant cavity, and the light beam of the specific wavelength is reflected back and forth between the silicon photonics chip and the semiconductor gain chip, ensuring stable output of the light beam of the specific wavelength from the semiconductor gain chip.

[0069] The optical module further includes a transmitting optical fiber adapter 800 and a receiving optical fiber adapter 801. The transmitting optical fiber adapter 800 is used to transmit high-speed optical signals, and the receiving optical fiber adapter 801 is used to receive high-speed optical signals.

[0070] Coherent component 500, placed on a circuit board, is used to achieve high-speed optical-to-electrical signal conversion. Specifically, coherent component 500 includes an optical transmit interface, an optical receive interface, and a local oscillator (LO) optical interface. A first optical fiber extends from the optical transmit interface, a second optical fiber extends from the optical receive interface, and a third optical fiber extends from the LO interface. The optical transmit interface is connected to the transmit fiber adapter 800, the optical receive interface is connected to the receive fiber adapter 801, and the LO interface is connected to the local oscillator (LO) light source 401. The coherent component is connected to the transmit fiber adapter, the receive fiber adapter, and the LO light source 401 via the optical transmit interface, the optical receive interface, and the LO interface, respectively. The coherent component 500 is also connected to the DSP chip.

[0071] The narrow-linewidth, high-power laser light emitted by the local oscillator light source 401 is input into the coherent component 500 through the local oscillator optical interface. Within the coherent component 500, this laser light is split into two beams. One beam, acting as the transmit beam, enters the coherent modulator within the coherent component. Driven by the high-speed electrical signals of the DSP chip, this optical-to-electrical signal is converted. The converted high-speed optical signal is then output from the module's optical transmit interface. The other beam, acting as the local oscillator light beam, undergoes coherent demodulation with the high-speed optical signal input into the coherent component 500 from the module's optical receive port. The demodulated electrical signal enters the DSP chip for signal processing, completing the optical-to-electrical signal conversion. The narrow-linewidth, high-power laser light is a beam of a specific wavelength.

[0072] LO light source 401 also includes an internal fiber adapter. A first optical fiber extends from the internal fiber adapter, and a local oscillator optical interface extends from the local oscillator optical fiber. The first optical fiber and the local oscillator optical fiber are fusion-connected to connect the internal fiber adapter to the local oscillator optical interface. A second optical fiber extends from the transmitting fiber adapter 800, and the transmitting optical interface extends from the transmitting optical fiber. The second optical fiber and the transmitting optical fiber are fusion-connected to connect the transmitting fiber adapter 800 to the transmitting optical interface. A third optical fiber extends from the receiving fiber adapter 801, and the receiving optical fiber extends from the receiving optical interface. The third optical fiber and the receiving optical fiber are fusion-connected to connect the receiving fiber adapter 801 to the receiving optical interface.

[0073] Figure 7 Schematic diagram of a simplified structure of a light receiving component according to some embodiments of the present disclosure. Figure 7 As shown, the optical receiving component includes: a local oscillator light source 401, a coherent component 500, a transimpedance amplifier 510, an analog-to-digital conversion sampler 520, and an MCU. The coherent component has a local oscillator interface and a receiving interface, wherein the local oscillator interface is connected to the local oscillator light source and receives the local oscillator light from the local oscillator light source; the receiving interface receives the first optical signal from the optical fiber. The coherent component receives the local oscillator light and the first optical signal, performs coherent demodulation on the local oscillator light and the first optical signal, and the receiving photodetector generates a photocurrent for the first optical signal. The transimpedance amplifier amplifies the photocurrent and outputs a voltage signal. The analog-to-digital conversion sampler collects data on the voltage signal, converts the voltage signal into a data signal, and transmits the collected data signal to the MCU. Based on the data signal, the MCU calculates the optical power value using a preset optical power formula.

[0074] The first signal light in the optical fiber contains signal lights of multiple wavelengths. By adjusting the frequency of the local oscillator light, the reception of signal lights of different wavelengths can be achieved.

[0075] In some embodiments, the MCU is further connected to a photoresistor, and the MCU receives a temperature signal from the photoresistor to obtain the temperature of the coherent component. The MCU calculates the actual optical power value based on the current receiving frequency.

[0076] The first optical power formula of the example is formula (1): P = P1-P2 (1)

[0077] Where P1 is the reference optical power, and P2 is the current frequency deviation. The reference optical power is calculated by substituting the data signal collected by the analog-to-digital conversion sampler into the reference optical power formula.

[0078] The reference optical power formula is formula (2), which represents the mapping relationship between the current AD sampling value and the reference optical power.

[0079] P1=aln(AD)+b(2),

[0080] In Formula 2, AD is the current AD sampling value of the analog-to-digital converter sampler, a is the formula coefficient, and b is a constant. During the calculation of the reference optical power formula, the temperature of the optical module and the frequency of the first optical signal do not change.

[0081] For example, P1 may be P1=4.4ln(AD)-44.

[0082] In some embodiments, the reference optical power formula is a relationship formula obtained by respectively collecting AD sampling values ​​and reference optical power and fitting calculations when the temperature is a first temperature and the frequency is a first frequency.

[0083] The frequency of the first optical signal of the coherent component is less than or greater than the frequency minimum, and the temperature of the coherent component is greater than or equal to the frequency maximum. Then, the first frequency is a value between the frequency minimum and the frequency maximum.

[0084] In some embodiments, the first temperature may be any temperature point between 23° C. and 27° C. For example, the first temperature is 25° C., that is, the sampling value and the reference optical power are collected when the frequency of the first signal light is 193.7 THz and the temperature is 25° C., and the reference optical power formula is obtained by fitting.

[0085] The current frequency deviation is the value calculated by substituting the current frequency value into the frequency deviation formula L2. The frequency deviation formula represents the mapping between frequency and optical power. The AD sampling value at this time is the data signal collected by the analog-to-digital converter sampler. The optical power calculated by substituting it into the formula is called the calculated optical power. The current optical power is the actual optical power of the first optical signal. The frequency deviation value is the difference between the calculated optical power and the actual optical power.

[0086] For ease of expression, the difference between the maximum frequency value and the minimum frequency value is referred to as the frequency extreme difference value. For example, the difference between the first frequency value and the minimum frequency value is referred to as the first frequency difference value, and the ratio of the first frequency difference value to the frequency extreme difference value is greater than or equal to 40%, and the ratio of the first frequency difference value to the frequency extreme difference value is less than or equal to 60%.

[0087] In some embodiments, the minimum frequency value of the first optical signal is 191.3 THz, and the maximum frequency value is 196.1 THz, so the first frequency may be 193.7 THz, that is, the sampling value and the reference optical power are collected at a frequency of 193.7 THz, and the reference optical power formula is obtained by fitting.

[0088] In some embodiments, the first frequency can be any point between a minimum frequency value and a maximum frequency value. For example, the minimum frequency value is 191.3 THz, the maximum frequency value is 196.1 THz, and the first frequency can be set to 193.7 THz. In some embodiments, when the frequency of the first optical signal is between 191.3 THz and 193.7 THz, the sampling value and the reference optical power are collected at the first frequency of 192.7 THz, and the reference optical power formula is obtained by fitting.

[0089] Table 1 is a value set of sampling values ​​and reference optical powers, wherein the sampling values ​​and reference optical powers are collected when the frequency of the first signal light is 193.7 THz and the temperature is 25°C.

[0090]

[0091] Figure 8 The data graph of the sampling values ​​in Table 1 and the sampling values ​​of the reference optical power is shown in Figure 1. Figure 8 As shown, the horizontal axis is the AD sampling value, and the vertical axis is the AD sampling value. Figure 8 The data in the table correspond to those in Table 1. They are all obtained by collecting sampling values ​​and reference optical powers when the frequency of the first signal light is 193.7 THz and the temperature is 25°C. The reference optical power formula is obtained by fitting calculation.

[0092] In some embodiments of the present application, a method for obtaining the frequency deviation formula includes:

[0093] When the temperature is a first temperature and the frequency of the first signal light is a first frequency, the actual optical power serves as the first reference value, and the actual optical power is a fixed value. When the frequency of the first signal light is a second frequency and the temperature is the first temperature, a second calculated optical power is calculated according to the reference optical power formula. The difference between the second calculated optical power and the first reference value is the second frequency deviation value. When the frequency of the first signal light is a third frequency and the temperature is the first temperature, a third calculated optical power is calculated according to the reference optical power formula. The difference between the third calculated optical power and the first reference value is the third frequency deviation value.

[0094] A frequency deviation formula is obtained by fitting according to the deviation values ​​of the first frequency, the second frequency, the third frequency and the optical powers corresponding thereto.

[0095] For example, the first frequency is V1, the first frequency deviation value is A1; the second frequency is V2, the second frequency deviation value is A2, and the frequency deviation formula after fitting includes a first frequency broken line segment and a second frequency broken line segment.

[0096] The first frequency broken line segment is obtained by fitting the first frequency as V1 and the first frequency deviation as 0; the second frequency as V2 and the second frequency deviation as A2, formula (3):

[0097]

[0098] The second frequency broken line segment is obtained by fitting the first frequency as V1 and the first frequency deviation as 0; the third frequency as V3 and the third frequency deviation as A3, formula (4):

[0099]

[0100] The frequency deviation formula is the mapping relationship between the frequency deviation value and the frequency. In formula (3) and formula (4), V is the current frequency, V1 is the first frequency, V3 is the third frequency, V2 is the second frequency, A2 is the difference between the current optical power and the reference optical power when the frequency is the second frequency, and A3 is the difference between the current optical power and the reference optical power when the frequency is the third frequency.

[0101] For example, if the temperature is 25°C, the first frequency is 193.7 THz, the second frequency is 191.3 THz, the fixed input optical power is -15 dBm, and the reported optical power is -16 dBm, then the second frequency deviation value A2 is -1 dB. If the temperature is 25°C, the third frequency is 196.1 THz, the fixed input optical power is -15 dBm, and the reported optical power is -14 dBm, then the third frequency deviation value A3 is 1 dB. Table 2 shows an example frequency deviation value data table for this application. Figure 9 It is the frequency deviation curve shown based on the data in Table 2. Figure 9 The horizontal axis is the temperature value and the vertical axis is the temperature deviation value.

[0102] When the temperature is the first temperature and the frequency of the first signal light is 193.7 THz, the actual optical power serves as the first reference value, the actual optical power is a fixed value, and the power deviation value is 0. When the frequency of the first signal light is 191.3 THz and the temperature is the first temperature, the second calculated optical power is calculated according to the reference optical power formula. The difference between the second calculated optical power and the first reference value, i.e., the second frequency deviation value, is 1. When the frequency of the first signal light is 196.1 THz and the temperature is the first temperature, the third calculated optical power is calculated according to the reference optical power formula. The difference between the third calculated optical power and the first reference value, i.e., the third frequency deviation value, is -1.

[0103]

[0104] In some embodiments, the frequency deviation formula may be obtained by collecting multiple frequencies and the deviation values ​​of the optical powers corresponding to the frequencies, and then performing fitting calculations. For example, the frequency deviation formula may be obtained by collecting four, five, or six frequencies and the deviation values ​​of the optical powers corresponding to the frequencies, and then performing fitting calculations.

[0105] In some embodiments, the optical power formula is formula (1): P=P1-P2(1), where P1 is the reference optical power and P2 is the current frequency deviation.

[0106] Collect the current AD sampling value, substitute the AD sampling value into the reference optical power formula to calculate the reference optical power value. Collect the frequency of the current signal light, substitute the frequency value into the current frequency deviation formula to calculate the current frequency deviation value.

[0107] The first optical power formula provided in this application calculates a reference optical power value by substituting the AD sampling value into the reference optical power formula, and calculates the current frequency deviation based on the current frequency value into the frequency deviation formula. The calculated optical power value is obtained by subtracting the current frequency deviation from the reference optical power value. This calculated optical power value is based on the reference optical power value, and the current frequency deviation is subtracted, making the calculated optical power closer to the actual optical power, thereby improving the accuracy of the reported optical power.

[0108] Other embodiments of the present disclosure further disclose that: the MCU calculates the optical power value according to the current receiving frequency and the current temperature.

[0109] The second optical power formula of the example is formula (5): P=P1-P2-P3(5).

[0110] Where P1 is the reference optical power, P2 is the current frequency deviation, and P3 is the current temperature deviation.

[0111] The reference optical power is a functional relationship between the AD sampling value and the reference optical power when the frequency of the first optical signal is the first frequency at the first temperature. The reference optical power is a reference optical power value calculated by substituting the data signal collected by the analog-to-digital conversion sampler into the reference optical power formula.

[0112] The reference optical power formula is formula (2), which represents the mapping relationship between the sampling value and the reference optical power.

[0113] P1=aln(AD)+b (2)

[0114] In Equation 2, AD is the current AD sampling value of the analog-to-digital converter sampler. The current temperature deviation value is the value calculated by substituting the current temperature value into the temperature deviation formula. The temperature deviation formula represents the mapping relationship between temperature value and optical power.

[0115] The current frequency deviation is a value calculated by substituting the current frequency value into the frequency deviation formula. The frequency deviation formula represents a mapping relationship between frequency value and optical power. In some embodiments, the reference optical power formula is a relationship calculated by fitting the sampled value and the reference optical power when the temperature is a first temperature and the frequency is a first frequency.

[0116] The current temperature deviation value is calculated by substituting the current frequency value into the temperature deviation formula. The temperature deviation formula represents the mapping relationship between temperature and optical power.

[0117] Wherein the temperature of the coherent component is less than or greater than the temperature minimum value, and the temperature of the coherent component is greater than or equal to the temperature maximum value, the first temperature is a value between the temperature minimum value and the temperature maximum value.

[0118] For ease of expression, the difference between the maximum temperature value and the minimum temperature value is referred to as the extreme temperature difference value. For example, the difference between the first temperature value and the minimum temperature value is referred to as the first temperature difference value, and the ratio of the first temperature difference value to the extreme temperature difference value is greater than or equal to 35%, and the ratio of the first temperature difference value to the extreme temperature difference value is less than or equal to 75%.

[0119] In some embodiments of the present application, the method for obtaining the frequency deviation formula is consistent with the above description and will not be repeated here.

[0120] When the temperature is the first temperature and the frequency of the first signal light is the first frequency, the actual optical power serves as the first reference value, and the actual optical power is a fixed value. When the frequency of the first signal light is the first frequency and the temperature is the second temperature, the fourth calculated optical power is calculated according to the reference optical power formula. The difference between the fourth calculated optical power and the first reference value is the second temperature deviation value. When the frequency of the first signal light is the first frequency and the temperature is the third temperature, the fifth calculated optical power is calculated according to the reference optical power formula. The difference between the fifth calculated optical power and the first reference value is the third temperature deviation value. The second temperature is lower than the first temperature, and the third temperature is higher than the first temperature.

[0121] A temperature deviation formula is obtained by fitting according to the first temperature, the second temperature, the third temperature and the deviation values ​​of the optical powers respectively corresponding to the first temperature, the second temperature and the third temperature.

[0122] For example, the first temperature is W1, the first temperature deviation value is I1; the second temperature is W2, the second temperature deviation value is I2, and the fitted temperature deviation formula includes a first temperature broken line segment and a second temperature broken line segment.

[0123] The first temperature segment is obtained by fitting the first temperature as W1 and the first temperature deviation as 0; the second temperature as W2 and the second temperature optical power as I2, formula (6):

[0124]

[0125] The second temperature broken line segment is obtained by fitting the first temperature as W1, the first temperature optical power as 0, the third temperature as W3, and the third temperature optical power as I3, formula (7):

[0126]

[0127] The temperature deviation formula is a mapping relationship between the temperature deviation value and the temperature. In formula (6) and formula (7), W is the current frequency, W1 is the first temperature, W3 is the third temperature, W2 is the second temperature, I2 is the difference between the current optical power and the reference optical power at the second temperature, and I3 is the difference between the current optical power and the reference optical power at the third temperature.

[0128] For example, the frequency of the first signal light is 193.7 THz, the second temperature is 0°C, the fixed input optical power is -15 dBm, the reported optical power is -16 dBm, and the second temperature deviation value I2 is -1 dB. The frequency of the first signal light is 193.7 THz, the third temperature is 55°C, the fixed input optical power is -15 dBm, the reported optical power is -14 dBm, and the third temperature deviation value I3 is 1 dB.

[0129] Table 3 is a temperature deviation data table of an example of this application. Figure 10 This is the temperature deviation curve based on the data in Table 3.

[0130] In some embodiments, when the frequency of the first optical signal is 191.3 THz to 193.7 THz, sampling values ​​and reference optical power are collected when the first frequency is 192.7 THz, and the reference optical power formula is obtained by fitting.

[0131] In some embodiments of the present application, a method for obtaining a temperature deviation formula includes: collecting the frequency of the first signal light as the first frequency, fixing the optical power as the first reference value. The frequency of the first signal light is collected as the first frequency, fixing the optical power as the first reference value, and the difference between the optical power corresponding to the second temperature of the coherent optical chip and the first reference value is called the second temperature deviation value. The frequency of the first signal light is collected as the first frequency, and the optical power corresponding to the third temperature of the coherent optical chip is called the third temperature deviation value. The second temperature is less than the first temperature, and the third temperature is greater than the first temperature.

[0132] A temperature deviation formula is obtained by fitting according to the first temperature, the second temperature, the third temperature and the deviation values ​​of the optical powers respectively corresponding to the first temperature, the second temperature and the third temperature.

[0133] In some embodiments, the temperature deviation formula can be obtained by collecting multiple temperatures and the optical power deviation values ​​corresponding to the different temperatures, and then performing fitting calculations. For example, the frequency deviation formula can be obtained by collecting four, five, or six temperatures and the optical power deviation values ​​corresponding to the temperatures, and then performing fitting calculations.

[0134] In some embodiments, the optical power formula is formula (2): P = P1-P2-P3 (5), wherein P1 is the reference optical power, P2 is the current frequency deviation, and P3 is the current temperature deviation.

[0135] Collect the current AD sampling value and substitute it into the reference optical power formula to calculate the reference optical power value. Collect the current signal light frequency and substitute it into the frequency deviation formula to calculate the current frequency deviation value. Collect the current temperature and substitute it into the temperature deviation formula to calculate the current temperature deviation value.

[0136] The first optical power formula provided in this application calculates a reference optical power value by substituting the AD sampling value into the reference optical power formula, substituting the current frequency value into the frequency deviation formula to calculate the current frequency deviation, and calculating the temperature deviation value based on the current temperature. The calculated optical power value is obtained by subtracting the current frequency deviation and current temperature deviation values ​​from the reference optical power value. This calculated optical power value is based on the reference optical power value, subtracting the current frequency deviation and current temperature deviation values, making the calculated optical power closer to the actual optical power and improving the accuracy of the reported optical power.

[0137] Since the above embodiments are all described by reference in combination with other embodiments, different embodiments have the same parts, and the same and similar parts between the various embodiments in this specification can be referred to each other. No further detailed explanation is given here.

[0138] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such circuit structure, article or device. In the absence of further restrictions, the presence of an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the circuit structure, article or device comprising the element.

[0139] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure of this application. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0140] The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims

1. An optical module, characterized in that: include: The receiving photodetector generates a photocurrent in response to the first light signal; A transimpedance amplifier receives the photogenerated current, amplifies the photogenerated current, and outputs a voltage signal; The analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to the MCU; MCU, calculates and reports the optical power according to the AD sampling value, the frequency of the first optical signal and the optical power formula; The optical power formula is: P = P1-P2 (1); In formula (1), P1 is the reference optical power, and P2 is the current frequency deviation; The reference optical power is a functional relationship between the AD sampling value and the reference optical power when the frequency of the first optical signal is the first frequency at the first temperature; The frequency deviation is a functional relationship between a frequency difference and a frequency at the first temperature, wherein the frequency difference is a difference between optical powers corresponding to different frequencies and a reference optical power.

2. The optical module according to claim 1, characterized in that: The current frequency deviation includes a first frequency broken line segment and a second frequency broken line segment; The first frequency broken line segment is: The second frequency broken line segment is: In formulas (3) and (4), V is the current frequency, V1 is the first frequency, V3 is the third frequency, V2 is the second frequency, A2 is the difference between the current optical power and the reference optical power when the frequency is the second frequency, and A3 is the difference between the current optical power and the reference optical power when the frequency is the third frequency. The second frequency is less than the first frequency; The third frequency is greater than the first frequency.

3. The optical module according to claim 1, characterized in that: The reference optical power formula is: P1=aln(AD)+b(2), In formula (2), AD is the current AD sampling value, a is the formula coefficient, and b is a constant.

4. The optical module according to claim 1, characterized in that: The frequency of the first optical signal is greater than or equal to 191.3 THz, and the frequency of the first optical signal is less than or equal to 196.1 THz.

5. The optical module according to claim 1, characterized in that: The frequency of the first optical signal is greater than or equal to a frequency minimum value, and the frequency of the first optical signal is less than or equal to a frequency maximum value; the difference between the frequency maximum value and the frequency minimum value is a frequency difference value; The ratio of the difference between the first frequency and the minimum frequency value to the frequency extreme difference value is 40% to 60%.

6. The optical module according to claim 1, characterized in that: The frequency of the first optical signal is greater than or equal to 191.3 THz, and the frequency of the first optical signal is less than or equal to 196.1 THz; the first frequency is 193.7 THz.

7. The optical module according to claim 1, characterized in that: The first temperature is any temperature point between 23 and 27°C.

8. An optical module, characterized in that: include: A coherent component, wherein the coherent component receives the local oscillator light and the first optical signal, and coherently demodulates the local oscillator light and the first optical signal to generate a photo-generated current; A transimpedance amplifier receives the photogenerated current, amplifies the photogenerated current, and outputs a voltage signal; The analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to the MCU; A temperature collector is connected to the MCU, and collects the temperature of the relevant components; MCU, calculates and reports the optical power according to the AD sampling value, the frequency of the first optical signal and the optical power formula; The optical power formula is: P = P1-P2-P3 (5); In formula (1), P1 is the reference optical power, P2 is the current frequency deviation, and P3 is the current temperature deviation. The reference optical power is a functional relationship formula between the AD sampling value and the reference optical power when the frequency of the first optical signal is the first frequency at the first temperature. The frequency deviation is a functional relationship between the frequency difference and the frequency at the first temperature, and the frequency difference is the difference between the optical power corresponding to different frequencies and the reference optical power; The frequency deviation is a functional relationship between a frequency difference and temperature at the first frequency, and the frequency difference is a difference between optical powers corresponding to different temperature rates and a reference optical power.

9. The optical module according to claim 8, characterized in that: The reference optical power formula is: P1 = a1n(AD) + b(2), In formula (2), AD is the current AD sampling value, a is the formula coefficient, and b is a constant; The current frequency deviation is a mapping relationship between a frequency deviation value and a frequency.

10. The optical module according to claim 8, characterized in that: The temperature deviation includes: a first temperature broken line segment and a second temperature broken line segment; Wherein, the first temperature broken line segment: The second temperature broken line segment: In equations (6) and (7), W is the current frequency, W1 is the first temperature, W3 is the third temperature, W2 is the second temperature, I2 is the difference between the current optical power and the reference optical power at the second temperature, and I3 is the difference between the current optical power and the reference optical power at the third temperature. The current frequency deviation includes a first frequency broken line segment and a second frequency broken line segment; The first frequency broken line segment is: The second frequency broken line segment is: In formulas (3) and (4), V is the current frequency, V1 is the first frequency, V3 is the third frequency, V2 is the second frequency, A2 is the difference between the current optical power and the reference optical power when the frequency is the second frequency, and A3 is the difference between the current optical power and the reference optical power when the frequency is the third frequency.

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