Optical module and received optical power monitoring method

Abstract

Disclosed are an optical module and a received optical power monitoring method. The optical module comprises an optical receiver component, and the optical receiver component comprises a photoelectric detector, an amplitude measurer, a compensation controller and an equalizer. The photoelectric detector is configured to convert signal light into an electrical signal. The amplitude measurer is configured to measure an amplitude value of the amplified electrical signal. According to the amplitude value, the compensation controller can output different equalization compensation values to control the equalizer, so that the equalizer compensates for the electrical signal according to the equalization compensation values.

Description

Optical module and received optical power monitoring method

[0001] This application claims priority to application number 202410220263.7 filed with the China Patent Office on February 28, 2022; and priority to application number 202410367227.3 filed with the China Patent Office on March 28, 2024; all contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the field of communication technology, and in particular to an optical module and a method for monitoring received optical power. Background Art

[0003] Passive Optical Network (PON) is a fiber-optic access technology that distributes fiber signals to multiple users via passive optical splitters, achieving fiber-to-the-home (FTTH). With its high transmission rates, wide coverage, low cost, and energy-saving and environmentally friendly advantages, PON has become a mainstream technology for broadband access. PON is an optical distribution network between the optical transmission line (OLT) and optical network units (ONUs) without any active electronic devices. It includes ATM-based passive optical networks (APON) and IP-based passive optical networks (E / GPON).

[0004] Summary of the Invention

[0005] In a first aspect, an embodiment of the present disclosure discloses an optical module, including a light receiving component, the light receiving component including:

[0006] a photodetector configured to convert signal light into an electrical signal;

[0007] an amplitude detector, an input end of which is connected to the output end of the transimpedance amplifier, and the amplitude detector is configured to detect an amplitude value of the amplified electrical signal;

[0008] a compensation controller, whose input terminal is connected to the first output terminal of the amplitude detector, and the compensation controller is configured to calculate a current voltage amplitude value according to the amplitude value, and output a balanced compensation value according to the current voltage amplitude value, the previous voltage amplitude value, the first compensation table, and the second compensation table;

[0009] an equalizer, wherein a first input terminal is connected to the second output terminal of the amplitude detector, a second input terminal is connected to the output terminal of the compensation controller, and the equalizer is configured to perform equalization compensation on the electrical signal according to the equalization compensation value;

[0010] The compensation controller is configured to: output a balanced compensation value according to a first compensation table when the current voltage amplitude value is greater than or equal to the previous voltage amplitude value;

[0011] When the current voltage amplitude value is less than the previous voltage amplitude value, outputting the equalization compensation value according to the second compensation table;

[0012] And / or, the optical module further includes:

[0013] circuit boards;

[0014] The MPD is electrically connected to the circuit board and is configured to receive the detection light signal split by the light receiving component and output a photocurrent, wherein the detection light signal is used to monitor the received light power;

[0015] A first transimpedance amplifier is provided on a circuit board, wherein a detection input terminal of the first transimpedance amplifier is connected to an output terminal of the MPD, and the gain of the first transimpedance amplifier processes the photocurrent; wherein the first transimpedance amplifier has a variable gain and the gain of the first transimpedance amplifier is switched according to a control signal received by a control terminal of the first transimpedance amplifier;

[0016] The MCU is arranged on a circuit board, wherein the sampling input terminal of the MCU is connected to the detection output terminal of the first transimpedance amplifier, and the control terminal of the MCU is connected to the control terminal of the first transimpedance amplifier so as to send a control signal to the first transimpedance amplifier through the control terminal of the MCU; the MCU obtains a photovoltage value through the sampling input terminal, and calculates the received optical power using the photovoltage value and the current gain of the first transimpedance amplifier.

[0017] In a second aspect, an embodiment of the present disclosure discloses a method for monitoring received optical power, comprising:

[0018] detecting a detection output terminal of the first transimpedance amplifier to sample and obtain a photovoltage value;

[0019] comparing the photovoltage value with a first photovoltage threshold, where the first photovoltage threshold is a preset photovoltage value for determining whether to adjust the gain of the first transimpedance amplifier to a first gain;

[0020] If the photovoltage value is less than the first photovoltage threshold and the current gain of the first transimpedance amplifier is the second gain, sending a first control signal to the first transimpedance amplifier to adjust the gain of the first transimpedance amplifier to the first gain;

[0021] Resample to obtain the photovoltage value;

[0022] The received optical power is calculated by combining the photovoltage value obtained by resampling, the responsivity of the MPD, the first gain, the gain constant corresponding to the first gain, the photocurrent-to-photovoltage conversion relationship, and the received optical power calculation relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] FIG1 is a partial architecture diagram of an optical communication system according to some embodiments of the present disclosure;

[0025] FIG2 is a partial structural diagram of a host computer provided according to some embodiments of the present disclosure;

[0026] FIG3 is a structural diagram of an optical module provided according to some embodiments of the present disclosure;

[0027] FIG4 is an exploded view of an optical module according to some embodiments of the present disclosure;

[0028] FIG5 is a first structural diagram of a light receiving component provided according to some embodiments of the present disclosure;

[0029] FIG6 is a schematic diagram of a curve showing the optical power and bit error rate of an optical receiving component in an OLT in the related art;

[0030] FIG7 is a second structural diagram of a light receiving component provided according to some embodiments of the present disclosure;

[0031] FIG8 is a first schematic diagram of a first compensation table according to some embodiments of the present disclosure;

[0032] FIG9 is a second schematic diagram of a first compensation table provided according to some embodiments of the present disclosure;

[0033] FIG10 is a first schematic diagram of a second compensation table according to some embodiments of the present disclosure;

[0034] FIG11 is a schematic diagram of the internal structure of an optical module according to some embodiments of the present disclosure;

[0035] FIG12 is a schematic diagram of a received optical power monitoring principle according to some embodiments of the present disclosure;

[0036] FIG13 is another schematic diagram of received optical power monitoring according to some embodiments of the present disclosure;

[0037] FIG14 is a diagram illustrating a usage state of a TIA component according to some embodiments of the present disclosure;

[0038] FIG15 is a gain relationship diagram of a TIA component provided according to some embodiments of the present disclosure;

[0039] FIG16 is a flow chart of a method for monitoring received optical power according to some embodiments of the present disclosure;

[0040] FIG17 is a flowchart of another method for monitoring received optical power according to some embodiments of the present disclosure;

[0041] FIG18 is a flowchart of another method for monitoring received optical power according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0042] Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, the embodiments described are only some of the embodiments of the present disclosure, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present disclosure are within the scope of protection of the present disclosure.

[0043] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be interpreted as open and inclusive, meaning "including, but not limited to." The terms "first" and "second" are not to be understood as indicating or implying relative importance or an upper limit on quantity. The term "plurality" means two or more. The term "connected" is to be interpreted broadly, for example, "connected" can mean fixed, detachable, or integrated, directly connected, or indirectly connected through an intermediary. The use of the terms "suitable for" or "configured to" is intended to be open and inclusive, and does not exclude devices that are suitable for or configured to perform additional tasks or steps. Terms such as "parallel," "perpendicular," "same," "consistent," and "aligned" are not to be limited to absolute mathematical theoretical relationships, but also include acceptable error ranges arising in practice, as well as differences arising from manufacturing based on the same design concept. Without further limitation, the phrase "comprising a..." does not preclude the presence of additional identical elements in the circuit structure, article, or device that includes the element.

[0044] 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.

[0045] The conversion of optical 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 and / or optical signal output of the optical module, and an optical network terminal is connected to the electrical signal input and / or electrical signal output of the optical module. A first optical signal from the optical fiber is transmitted into the optical module, which converts the first optical signal into a first electrical signal, which is then transmitted into the optical network terminal. Since information processing devices can be connected to each other via an electrical signal network, at least one type of information processing device needs to be directly connected to the optical module. It is not necessary for all types of information processing devices 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.

[0046] Figure 1 is a partial architecture diagram of an optical communication system according to some embodiments of the present disclosure. As shown in Figure 1, the optical communication system partially comprises 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Optical Network Unit (ONU), Optical Line Terminal (OLT), Optical Network Equipment (ONT) and data center servers are common host computers.

[0052] 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 .

[0053] 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.

[0054] For example, a first optical signal from the direction of the remote information processing device 1000 propagates through the optical fiber 101, and 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.

[0055] 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.

[0056] FIG2 is a partial structural diagram of a host computer provided according to some embodiments of the present disclosure. In order to clearly illustrate the connection relationship between the optical module 200 and the host computer 100, FIG2 only shows the structure of the host computer 100 related to the optical module 200. As shown in FIG2, the host computer 100 also includes a PCB circuit board 105 disposed within the housing, a cage 106 disposed on the surface of the PCB circuit board 105, a heat sink 107 disposed on the cage 106, and an electrical connector (not shown) disposed inside the cage 106. The heat sink 107 has a raised structure that increases the heat dissipation area. A fin-like structure is a common raised structure.

[0057] 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.

[0058] Figure 3 is a structural diagram of an optical module provided according to some embodiments of the present disclosure, and Figure 4 is an exploded view of an optical module provided according to some embodiments of the present disclosure. As shown in Figures 3 and 4, the optical module 200 includes a housing, a circuit board 300 disposed within 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 either the light emitting component 400 or the light receiving component 500.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] The direction of the line connecting the two openings 204 and 205 can be consistent with the length of the optical module 200, or it can be inconsistent with the length of the optical module 200. For example, opening 204 is located at the end of the optical module 200 (the right end in Figure 3), and opening 205 is also located at the end of the optical module 200 (the left end in Figure 3). Alternatively, opening 204 is located at the end of the optical module 200, while opening 205 is located on the side of the optical module 200. Opening 204 is an electrical interface, from which the gold finger 301 of the circuit board 300 extends and is inserted into the electrical connector of the host computer; opening 205 is an optical port, configured to receive the optical fiber 101, so that the optical fiber 101 can connect to the optical emitting component 400 and / or the optical receiving component 500 in the optical module 200.

[0063] 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.

[0064] In some embodiments, the upper shell 201 and the lower shell 202 are made of metal materials, which facilitates electromagnetic shielding and heat dissipation.

[0065] 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.

[0066] 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.

[0067] The circuit board 300 includes circuit traces, electronic components, and chips. The circuit traces connect the electronic components and chips together according to the circuit design 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, a microcontroller unit (MCU), a laser driver chip, a transimpedance amplifier (TIA), a limiting amplifier, a clock and data recovery chip 310 (CDR), a power management chip, and a digital signal processing (DSP) chip.

[0068] 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.

[0069] The circuit board 300 also includes gold fingers 301 formed on its end surface. Gold fingers 301 are composed of multiple independent pins. The circuit board 300 is inserted into the cage 106, and the gold fingers 301 are electrically connected to the electrical connector inside the cage 106. The gold fingers 301 can be provided only on one side of the circuit board 300 (such as the top surface shown in Figure 4), or they can be provided on both the top and bottom surfaces of the circuit board 300 to provide more pins. The gold fingers 301 are configured to establish an electrical connection with the host computer to achieve power supply, grounding, I2C signal transmission, data signal transmission, etc.

[0070] 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.

[0071] The light emitting component 400 and / or the light receiving component 500 are located on the side of the circuit board 300 away from the gold finger 301; in some embodiments, the light emitting component 400 and the light receiving component 500 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.

[0072] The first optical signal from the direction of the remote information processing device 1000 propagates through the optical fiber 101, and 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.

[0073] In some embodiments, during a first time period, the optical receiving component 500 may receive a first optical signal and convert the first optical signal into a first electrical signal. During a second time period, the optical receiving component 500 may receive a second optical signal and convert the second optical signal into a second electrical signal. The optical power corresponding to the first optical signal is the first optical power; the optical power corresponding to the second optical signal is the second optical power. The first optical power and the second optical power are different.

[0074] In some embodiments, the first optical signal comes from a first optical network unit, and the second optical signal comes from a second optical network unit. A distance between the first optical network unit and the optical receiving component is different from a distance between the second optical network unit and the optical receiving component, resulting in the first optical power being different from the second optical power.

[0075] Figure 5 is a schematic diagram of a light receiving component and a circuit board structure according to some embodiments of the present disclosure. As shown in Figure 5, in some embodiments, the light receiving component may include: a photodetector 510, which converts a received light signal into an electrical signal.

[0076] The photodetector 510 may convert the first optical signal into a first electrical signal. The photodetector 510 may convert the second optical signal into a second electrical signal.

[0077] The light receiving component may include a second cross-group amplifier that can amplify the electrical signal output by the photodetector 510 , and the output signal is an amplified electrical signal.

[0078] The second cross-group amplifier may be a transimpedance amplifier, which amplifies the electrical signal output by the photodetector 510. The output signal is an amplified electrical signal. Due to the distance between the OLT and the ONU, there is signal loss during the transmission of the optical signal from the ONU to the OLT, resulting in a bit error rate in the optical signal received by the OLT.

[0079] The optical receiving component may include an equalizer 530 , which may perform equalization compensation on the amplified electrical signal to reduce the bit error rate of the compensated electrical signal.

[0080] In some embodiments, the electrical signal output by the photodetector 510 may be a differential signal or a single-ended signal.

[0081] The optical receiving component may include a clock data recovery chip 310. The output end of the equalizer 530 may be connected to the input end of the clock data recovery chip 310. The output end of the clock data recovery chip 310 may be connected to a host computer.

[0082] The optical signal is converted into an electrical signal by the photodetector 510. The second cross-group amplifier amplifies the electrical signal and then outputs it to the clock data recovery chip 310 after equalization compensation by the equalizer 530. The equalizer 530 can equalize the electrical signal to reduce the bit error rate of the electrical signal and improve the communication quality.

[0083] Figure 6 is a schematic diagram of the optical power and bit error rate curve of the optical receiving component in the OLT in the related art. Figure 7 is a second structural schematic diagram of an optical receiving component provided according to some embodiments of the present disclosure. As shown in Figures 6 and 7, the bit error rate of the optical receiving component varies when the optical power varies.

[0084] A first distance exists between the first optical network unit and the optical receiving component, and a second distance exists between the second optical network unit and the optical receiving component, where the first distance is different from the second distance. Therefore, the first optical power is different from the second optical power, and the bit error rate of the electrical signal converted from the optical signal is different. To optimize the signal-to-noise ratio of the electrical signal of the optical receiving component and improve signal stability, the optical receiving component may include an amplitude detector 540, which is located between the equalizer 530 and the limiting amplifier and detects the amplitude of the amplified electrical signal output by the second cross-group amplifier.

[0085] In some embodiments, the input end of the amplitude detector 540 may be connected to the output end of the second trans-group amplifier, and the amplitude value of the amplified electrical signal output by the second trans-group amplifier is detected by the amplitude detector 540 .

[0086] The first output terminal of the amplitude detector 540 can be connected to the input terminal of the compensation controller 550 , and the first output terminal outputs the amplitude value of the amplified electrical signal.

[0087] The second output terminal of the amplitude detector 540 can be connected to the input terminal of the equalizer 530, and the second output terminal outputs the amplified electrical signal.

[0088] The output terminal of the compensation controller 550 may be connected to the equalizer 530, and the compensation controller 550 may output a control signal to the equalizer 530. In some embodiments, the equalizer 530 may receive the control signal output by the compensation controller 550 and perform equalization compensation on the electrical signal according to the control signal.

[0089] In some embodiments, the first input end of the equalizer 530 can be connected to the output end of the compensation controller 550, the second input end of the equalizer 530 can be connected to the second output end of the amplitude detector 540, and the output end of the equalizer 530 can be connected to the input end of the clock data recovery chip.

[0090] In some embodiments, the compensation controller 550 may output different equalization compensation values ​​to the equalizer 530 according to the amplitude value output by the amplitude detector 540 .

[0091] Figure 8 is a schematic diagram of a first compensation table according to some embodiments of the present disclosure. As shown in Figure 8, the compensation controller 550 may be provided with a first compensation table, wherein the first compensation table is a correspondence table between voltage amplitude values ​​and equalization compensation values.

[0092] The voltage amplitude value may include a first lower limit value. The equalization compensation value may include: a first compensation value and a second compensation value. The first compensation value and the second compensation value are different. The first compensation table can be interpreted as follows: when the voltage amplitude value is less than the first lower limit value, the equalization compensation value output by the compensation controller 550 is the first compensation value; when the voltage amplitude value is greater than or equal to the first lower limit value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0093] In some embodiments, the voltage amplitude value may include a first lower limit value and a first upper limit value. The equalization compensation value may include: a first compensation value, a second compensation value, and a third compensation value. The first compensation value, the second compensation value, and the third compensation value are different.

[0094] In some embodiments, the voltage amplitude value is calculated by applying the amplitude value output by the amplitude detector 540 to a preset algorithm. The compensation controller 550 pre-stores a first amplitude limit value and a second amplitude limit value.

[0095] In some embodiments of the present disclosure, the amplitude detector may be an operational amplifier.

[0096] In some embodiments the first amplitude limit is greater than the second amplitude limit.

[0097] For ease of description, the voltage amplitude value can be denoted as V; the first amplitude limit value can be denoted as V1; and the second amplitude limit value can be denoted as V2. The first amplitude limit value is the amplitude value corresponding to the amplitude detector 540 when the optical power input to the photodetector 510 is at the limit optical power. The limit optical power can be +1 dB of the overload optical power. The second amplitude limit value is the amplitude value corresponding to the amplitude detector 540 when the optical power input to the photodetector 510 is at an extremely low optical power. The limit optical power can be -2 dB of the sensitivity of the photodetector 510.

[0098] The preset algorithm for voltage limit is: V = 10*log(V1-V2) (1)

[0099] In formula (1), the voltage limit can be recorded as V; the first amplitude limit can be recorded as V1; and the second amplitude limit can be recorded as V2.

[0100] In some embodiments, the preset algorithm for the preset voltage amplitude value may be: V = 10*log(V1) (2)

[0101] In formula (2), the voltage limit can be recorded as V, the first amplitude limit can be recorded as V1, and the ratio of the current amplitude value to the voltage limit can be recorded as the voltage amplitude value.

[0102] As shown in Figure 8, the first compensation table can be interpreted as follows: when the voltage amplitude is less than the first lower limit, the equalization compensation value output by compensation controller 550 is the first compensation value EQ1; when the voltage amplitude is greater than or equal to the first lower limit and less than the first upper limit, the equalization compensation value output by compensation controller 550 is the second compensation value EQ2; and when the voltage amplitude is greater than or equal to the first upper limit, the equalization compensation value output by compensation controller 550 is the third compensation value EQ3. The equalization compensation values ​​output by compensation controller 550 vary depending on the voltage amplitude, facilitating adjustment of the equalizer based on the bit error rate of the electrical signal, improving equalization performance, and enhancing communication quality.

[0103] Figure 9 is a second schematic diagram of a first compensation table provided according to some embodiments of the present disclosure. As shown in Figure 9, the first amplitude limit may be 0.4, and the second amplitude limit may be 0.7. In some embodiments, the first amplitude limit may be 0.3, and the second amplitude limit may be 0.8; or in some embodiments, the first amplitude limit may be 0.4, and the second amplitude limit may be 0.8.

[0104] When the optical receiving component receives an optical signal sent by an ONU at the same location, the signal amplitude will also vary. For example, if the data carried in the optical signal is a CID pattern, with 72 consecutive zeros, the amplitude value will be reduced. In other words, the optical signal of a data packet sent by an ONU at the same location will also cause the voltage amplitude value output by amplitude detector 540 to vary. If this voltage amplitude value fluctuates around the first amplitude limit, the control signal output by compensation controller 550 will continue to vary.

[0105] For example, the first lower limit is 0.4. When the voltage amplitude changes from 0.41 to 0.38, the control signal output by compensation controller 550 changes from the second compensation value to the first compensation value. When the data returns to a non-zero bit, the voltage amplitude may return to 0.41. According to the first compensation table, the control signal output by compensation controller 550 changes from the first compensation value to the second compensation value. If the control signal output by compensation controller 550 continuously jumps during the transmission of a data packet from an ONU at the same location, this may cause signal fluctuations.

[0106] Figure 10 is a schematic diagram of a second compensation table provided according to some embodiments of the present disclosure. As shown in Figure 10, the compensation controller 550 may include a second compensation table and a first compensation table. The second compensation table is a table that corresponds to voltage amplitude values ​​and equalization compensation values. The voltage amplitude values ​​in the second compensation table may include a second lower limit value. The equalization compensation values ​​may include: a first compensation value and a second compensation value. The first compensation value and the second compensation value are different. The first lower limit value is greater than the second lower limit value.

[0107] The compensation controller 550 can be configured to obtain a current voltage amplitude value and a previous voltage amplitude value. When the current voltage amplitude value is greater than or equal to the previous voltage amplitude value (low light in front, high light in the back), the control signal is output according to the current voltage amplitude value and the first compensation table. When the current voltage amplitude value is less than the previous voltage amplitude value (high light in front, low light in the back), the control signal is output according to the current voltage amplitude value and the second compensation table. The first lower limit value is greater than the second lower limit value.

[0108] The compensation controller 550 may be configured such that: when the current voltage amplitude value is greater than or equal to the previous voltage amplitude value (small light in front, large light in the back), and the current voltage amplitude value is less than the first lower limit value, the compensation controller 550 outputs a first compensation value as the equalization compensation value;

[0109] The current voltage amplitude value is greater than or equal to the previous voltage amplitude value (small light in front, large light in the back), and when the current voltage amplitude value is greater than or equal to the first lower limit value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0110] The current voltage amplitude value is smaller than the previous voltage amplitude value (large light is in front, small light is in the back), and when the current voltage amplitude value is smaller than the second lower limit value, the compensation controller 550 outputs the equalization compensation value as the first compensation value;

[0111] When the current voltage amplitude value is smaller than the previous voltage amplitude value (large light in front, small light in the back) and the current voltage amplitude value is greater than or equal to the second lower limit value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0112] In some embodiments, the first lower limit value is greater than the second lower limit value. When the voltage amplitude value output by the amplitude detector 540 changes from less than the first lower limit value to greater than or equal to the first lower limit value, according to the first compensation table, the current voltage amplitude value is greater than or equal to the first lower limit value, and the control signal output by the compensation controller 550 is converted from the first compensation value to the second compensation value; when the voltage amplitude value output by the amplitude detector 540 changes from greater than or equal to the first lower limit value to less than the first lower limit value, but the current voltage amplitude value is greater than or equal to the second lower limit value, according to the second compensation table, the current voltage amplitude value is not less than the second lower limit value, and the control signal output by the compensation controller 550 maintains the second compensation value unchanged, thereby increasing the hysteresis space and avoiding signal fluctuations caused by frequent switching.

[0113] For example, when the first lower limit value is 0.4 and the second lower limit value is 0.3, when the voltage amplitude value output by the amplitude detector 540 changes from 0.38 to 0.41, according to the first compensation table, the current voltage amplitude value is greater than the first lower limit value, and the control signal output by the compensation controller 550 is converted from the first compensation value to the second compensation value; when the voltage amplitude value output by the amplitude detector 540 changes from 0.41 to 0.3, according to the second compensation table, the current voltage amplitude value is not less than the second lower limit value, and the control signal output by the compensation controller 550 maintains the second compensation value unchanged, thereby increasing the hysteresis space and avoiding frequent switching of the optical receiving component when receiving the ONU signal at the same position, resulting in signal fluctuations.

[0114] In some embodiments, the voltage amplitude values ​​in the second compensation table may include a second lower limit value; the voltage amplitude values ​​in the second compensation table may include a second upper limit value. The equalization compensation values ​​may include: a first compensation value, a second compensation value, and a third compensation value. The first compensation value, the second compensation value, and the third compensation value are different. The second lower limit value may be less than the first upper limit value, and the second upper limit value may be less than the first upper limit value.

[0115] In some embodiments, the second lower limit value is smaller than the first upper limit value, and the second upper limit value is larger than the first lower limit value.

[0116] For example, when the first upper limit value is 0.8 and the second upper limit value is 0.7, when the voltage amplitude value output by the amplitude detector 540 changes from 0.78 to 0.81, according to the first compensation table, the current voltage amplitude value is greater than the first upper limit value, and the control signal output by the compensation controller 550 is changed from the second compensation value to the third compensation value; when the voltage amplitude value output by the amplitude detector 540 changes from 0.81 to 0.78, according to the second compensation table, the current voltage amplitude value is not less than the second upper limit value, and the control signal output by the compensation controller 550 maintains the third compensation value unchanged, thereby increasing the hysteresis space and avoiding frequent switching of the optical receiving component when receiving the ONU signal at the same position, resulting in signal fluctuations.

[0117] The present disclosure can avoid signal fluctuations caused by frequent switching of the optical receiving component when receiving ONU signals at the same position through the setting of the first compensation table and the second compensation table, thereby improving communication stability.

[0118] In some embodiments of the present disclosure, the first compensation table can be set to a 2-stage type; the first compensation table can be set to a 3-stage type, and the first compensation table can be set to a multi-stage type. The specific settings can be made according to actual needs and will not be repeated here.

[0119] In some embodiments of the present disclosure, the second compensation table can be set to a 2-stage type; the second compensation table can be set to a 3-stage type, and the second compensation table can be set to a multi-stage type. The specific settings can be made according to actual needs and will not be repeated here.

[0120] In some embodiments, the photodetector 510 converts the received optical signal into an electrical signal, which is then amplified by a second transimpedance amplifier. The equalizer 530 can be configured to perform equalization compensation on the amplified electrical signal based on the equalization compensation value output by the compensation controller 550. The amplitude detector 540 detects the amplitude of the amplified electrical signal and outputs the amplitude value to the compensation controller 550. The compensation controller 550 outputs the equalization compensation value to the control equalizer 530 based on a preset compensation table, thereby controlling the equalizer 530 to perform equalization compensation on the amplified electrical signal and reduce the bit error rate of the signal. The compensation controller 550 is configured to calculate a voltage amplitude value based on the amplitude value. A first compensation table and a second compensation table are preset. When the current voltage amplitude value is greater than or equal to the previous voltage amplitude value, the control signal is output based on the current voltage amplitude value and the first compensation table. When the current voltage amplitude value is less than the previous voltage amplitude value, the control signal is output based on the current voltage amplitude value and the second compensation table. The first lower limit value is greater than the second lower limit value. This configuration increases the hysteresis margin of the amplitude switching point, preventing signal fluctuations caused by frequent switching.

[0121] In some embodiments, the first compensation table may include: the voltage amplitude value may include a first lower limit value; the equalization compensation value may include: a first compensation value and a second compensation value; wherein the first compensation value and the second compensation value are different. The compensation controller 550 is configured such that: when the current voltage amplitude value is less than the first lower limit value, the equalization compensation value output by the compensation controller 550 is the first compensation value; when the voltage amplitude value is greater than or equal to the first lower limit value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0122] The voltage amplitude values ​​in the second compensation table may include a second lower limit value. The equalization compensation values ​​may include: a first compensation value and a second compensation value. The first compensation value and the second compensation value are different. The first lower limit value is greater than the second lower limit value.

[0123] The compensation controller 550 may be configured such that: when the current voltage amplitude value is greater than or equal to the previous voltage amplitude value (small light in front, large light in the back), and the current voltage amplitude value is less than the first lower limit value, the compensation controller 550 outputs a first compensation value as the equalization compensation value;

[0124] The current voltage amplitude value is greater than or equal to the previous voltage amplitude value (small light in front, large light in the back), and when the current voltage amplitude value is greater than or equal to the first lower limit value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0125] The current voltage amplitude value is smaller than the previous voltage amplitude value (large light is in front, small light is in the back), and when the current voltage amplitude value is smaller than the second lower limit value, the compensation controller 550 outputs the equalization compensation value as the first compensation value;

[0126] When the current voltage amplitude value is smaller than the voltage amplitude value (large light in front, small light in the back) and the current voltage amplitude value is greater than or equal to the second lower limit value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0127] In some embodiments, the compensation controller may include a preset compensation table, which may be a correspondence table between voltage amplitude values ​​and equalization compensation values; or a correspondence table between amplitude values ​​and equalization compensation values.

[0128] In some embodiments, the preset compensation table may include: a first voltage value, a first compensation value, and a second compensation value. When the current amplitude value is less than the first voltage value, the equalization compensation value output by the compensation controller 550 is the first compensation value; when the current amplitude value is greater than the first voltage value, the equalization compensation value output by the compensation controller 550 is the second compensation value.

[0129] In some embodiments, the preset compensation table may be a first compensation table. The preset compensation table may be a second compensation table. The preset compensation table may be a first compensation table and a second compensation table.

[0130] In some embodiments, the optical module may include a clock data recovery chip, and the second transimpedance amplifier may be disposed between the equalizer and the clock data recovery chip.

[0131] In some embodiments, the optical module may include a limiting amplifier, and the limiting amplifier may be located between the equalizer and the clock data recovery chip.

[0132] Figure 11 is a schematic diagram of the internal structure of an optical module provided according to some embodiments of the present disclosure. As shown in Figure 11, the optical transceiver component 400 includes a light source 410 and a coherent optical component 420. Light source 410 is configured as an external light source for coherent optical component 420; coherent optical component 420 internally includes a coherent optical modulator, which is used to modulate the optical signal to generate an optical signal; coherent optical component 420 is also used to convert the optical signal input to the optical module (hereinafter referred to as the received optical signal) into an electrical signal, thereby enabling the optical module to receive the received optical signal.

[0133] That is, the photodetector described in detail in the foregoing embodiments of the present disclosure may include a coherent optical component 420 .

[0134] In some embodiments, the coherent light modulator is a silicon-based coherent light modulator or a thin-film lithium niobate-based coherent light modulator. The light source 410 may be a tunable laser that can output light of different wavelengths.

[0135] In some embodiments, the optical module 200 further includes a TIA component 310 (in some examples, may also be referred to as a first transimpedance amplifier) ​​and an MCU 320 . The TIA component 310 and the MCU 320 are electrically connected to the circuit board 300 , respectively.

[0136] Exemplarily, the TIA component 310 and the MCU 320 are disposed on the circuit board 300 . The detection input terminal of the TIA component 310 is electrically connected to the coherent optical component 420 , and the detection output terminal of the TIA component 310 is connected to the sampling input terminal of the MCU 320 .

[0137] In some examples, the TIA component 310 is a variable gain transimpedance amplifier, that is, the TIA component 310 can adjust the gain according to the optical power of the received optical signal, so that the TIA component 310 linearly amplifies the input photocurrent.

[0138] In some examples, the control terminal of the TIA component 310 is connected to the control terminal of the MCU 320 , and the control terminal of the MCU 320 sends a control signal to the TIA component 310 , so that the TIA component 310 adjusts its gain according to the received control signal.

[0139] In some examples, the TIA component 310 converts the detection optical signal and transmits the converted detection signal to the MCU 320 , so that the MCU 320 can perform detection sampling and calculate the received optical power based on the sampling value.

[0140] In some embodiments, the TIA component 310 may include a variable gain amplifier. The MCU 320 may adjust the gain of the variable gain amplifier according to the received optical power range of the optical module.

[0141] FIG12 is a schematic diagram of a received optical power monitoring principle according to some embodiments of the present disclosure. As shown in FIG12 , the present embodiment further includes an MPD, which can be located outside the coherent optical component 420 , with the output of the MPD connected to the detection input of the TIA component 310 .

[0142] In some examples, the received optical signal is transmitted to the coherent optical component 420, and a beam of detection optical signal is split out by the optical splitter in the coherent optical component 420 and transmitted to the MPD. The MPD receives the beam of detection optical signal and outputs a photocurrent to the TIA component 310. The TIA component 310 gains the input photocurrent and outputs a photovoltage to the MCU 320.

[0143] MCU320 receives the photovoltage and uses it to calculate the received optical power. In some embodiments, the optical splitter splits a small amount of the received optical signal and transmits it to the MPD. For example, the optical splitter splits 2-3% of the received optical signal and transmits it to the MPD. Of course, the splitting ratio of the optical splitter in the embodiments of the present disclosure is not limited to this.

[0144] Figure 13 is another schematic diagram of received optical power monitoring according to some embodiments of the present disclosure. As shown in Figure 13, unlike the schematic diagram of received optical power monitoring shown in Figure 12, the MPD in the embodiments of the present disclosure can be located within coherent optical component 420. The received optical signal input to coherent optical component 420 is split into a beam by an optical splitter and transmitted to the MPD.

[0145] In some embodiments of the present disclosure, MCU 320 stores the MPD responsivity, the gain constant of TIA component 310, the photocurrent-to-photovoltage conversion relationship, and the received optical power calculation relationship. The photocurrent-to-photovoltage conversion relationship is used to convert photovoltage to photocurrent, and the received optical power calculation relationship is used to calculate the received optical power from photocurrent. When MCU 320 obtains photovoltage from TIA component 310, it calculates the photocurrent using the photocurrent-to-photovoltage conversion relationship, and then calculates the received optical power using the received optical power calculation relationship.

[0146] The TIA component 310 receives the photocurrent output by the MPD and linearly amplifies the photocurrent to output a photovoltage. However, due to the limited linear amplification range of the TIA component 310, when the optical power of the received optical signal is too large and exceeds the linear amplification range of the TIA component 310, the output value of the TIA component 310 is saturated; when the optical power of the received optical signal is too small and does not enter the linear amplification range of the TIA component 310, the output value of the TIA component 310 is low and saturated, both of which will lead to inaccurate monitoring of the received optical power. In the embodiment of the present disclosure, the TIA component 310 uses a variable gain transimpedance amplifier. During use, the gain of the TIA component 310 can be adjusted according to the optical power to adjust the linear amplification range of the TIA component 310 so that the linear amplification range of the TIA component 310 can cover the optical power of the received optical signal.

[0147] In some embodiments, the TIA assembly 310 has two gains, such as a first gain (R1) and a second gain (R2), where the first gain is greater than the second gain, that is, R1 is greater than R2. When the optical power of the received optical signal is relatively low, the TIA assembly 310 uses R1; when the optical power of the received optical signal is relatively high, the TIA assembly 310 uses R2. Thus, when the TIA assembly 310 is in use, the gain can be selected based on the actual optical power of the received optical signal, ensuring that the linear amplification range of the TIA assembly 310 covers the optical power of the received optical signal.

[0148] Figure 14 illustrates a TIA component in use according to some embodiments of the present disclosure. As shown in Figure 14 , TIA component 310 may include an operational amplifier 311, a first resistor 312, a second resistor 313, and a control switch 314. The inverting input of operational amplifier 311 serves as the detection input of TIA component 310, and the input of control switch 314 is connected to the inverting input of operational amplifier 311.

[0149] One end of the first resistor 312 is connected to the first output end of the control switch 314, and the other end of the first resistor 312 is connected to the output end of the operational amplifier; one end of the second resistor 313 is connected to the second output end of the control switch 314, and the other end of the second resistor 313 is connected to the output end of the operational amplifier 311; the output end of the operational amplifier 311 is used as the detection output end of the TIA component 310; the control end of the control switch 314 is connected to the control end of the MCU320.

[0150] In some embodiments, the control switch 314 may be an analog switch. The MCU 320 sends a control signal to the control switch 314 to adjust the conduction direction of the control switch 314.

[0151] In some embodiments, when the control switch 314 is turned on at the first output terminal, the TIA component 310 has a first gain; when the control switch 314 is turned on at the second output terminal, the TIA component 310 has a second gain. The resistance of the first resistor 312 is different from the resistance of the second resistor 313, and the first gain and the second gain are different. For example, if the resistance of the first resistor 312 is greater than the resistance of the second resistor 313, the first gain is greater than the second gain.

[0152] In the embodiment of the present disclosure, the switch 314 in the TIA component 310 is not limited to being connected to two resistors, but may be connected to three or more resistors, so that the TIA component 310 has multiple gains not limited to the first gain and the second gain.

[0153] Figure 15 is a gain diagram of a TIA component provided according to some embodiments of the present disclosure, illustrating the conversion relationship between photocurrent and photovoltage of the TIA component. As shown in Figure 15 , the TIA component 310 includes a first gain curve 01 and a second gain curve 02 , which cover the target received optical power range of the optical module 200. Exemplarily, the resistance values ​​of the first resistor 312 and the second resistor 313 are adjusted based on the target received optical power range of the optical module 200, so that the first gain curve 01 and the second gain curve 02 cover the target received optical power range of the optical module 200.

[0154] In some embodiments, the first gain curve 01 and the second gain curve 02 divide the gain processing of the TIA component 310 into three interval segments; in some examples, the interval in which the photovoltage is less than the first voltage threshold, the interval in which the photovoltage is greater than the second voltage threshold, and the interval in which the photovoltage is between the first voltage threshold and the second voltage threshold.

[0155] In some embodiments, the gain switching photocurrent is selected based on the target received optical power range of the optical module 200. For example, if the target received optical power range is (-12dB, +3dB), the gain switching photocurrent can be selected to correspond to a target received optical power of -6dB, -7dB, or the like. Assuming the gain switching photocurrent is I0, an optical signal corresponding to the switching optical power of the gain switching photocurrent is input, and the control switch 314 is switched. The photovoltage value corresponding to the use of the first resistor is the second voltage threshold V02, and the photovoltage corresponding to the use of the second resistor is the first voltage threshold V01. The first output terminal of the control switch 314 is turned on, and an optical signal with the first target received optical power is input. If the first target received optical power is less than the switching optical power, a corresponding first photovoltage V1 is obtained. The second output terminal of the control switch 314 is turned on, and an optical signal with the second target received optical power is input. If the second target received optical power is greater than the switching optical power, a corresponding second photovoltage V2 is obtained. The photocurrent I1 corresponding to the first target received optical power and the photocurrent I2 corresponding to the second target received optical power are determined using the MPD responsivity. The photovoltage-to-photocurrent conversion relationship V = R1*I + B1 of the first gain curve 01 is determined using (I0, V01) and (I1, V1); wherein R1 is the gain corresponding to the first gain curve 01, and B1 is the gain constant of the first gain curve 01. The photovoltage-to-photocurrent conversion relationship V = R2*I + B2 of the second gain curve 02 is determined using (I0, V02) and (I1, V1); wherein R2 is the gain corresponding to the second gain curve 02, and B2 is the gain constant of the second gain curve 02.

[0156] In some embodiments of the present disclosure, MCU 320 outputs a first control signal to TIA component 310, and TIA component 310 adjusts its gain to R1 based on the received first control signal. MCU 320 also outputs a second control signal to TIA component 310, and TIA component 310 adjusts its gain to R2 based on the received second control signal. For example, the first control signal is a high-level signal, and the second control signal is a low-level signal. Of course, in some embodiments of the present disclosure, the first control signal can also be a low-level signal, and the second control signal can also be a high-level signal.

[0157] In some embodiments of the present disclosure, MCU 320 also stores a first photovoltage threshold value, which is a preset photovoltage value used by MCU 320 to determine whether to adjust the gain of TIA component 310 to a first gain. When TIA component 310 receives a photovoltage value, it compares the photovoltage value with the first photovoltage threshold value. If the photovoltage value is less than the first photovoltage threshold value, a first control signal is sent to TIA component 310 to set the gain to the first gain. Otherwise, a second control signal is sent to TIA component 310 to set the gain to the second gain.

[0158] In some embodiments of the present disclosure, the MCU 320 further sets a control flag, which is used to indicate the control signal sent by the MCU 320 to the TIA component 310 and is also used to identify the current gain of the TIA component 310. The MCU 320 updates the control flag based on the output control signal. For example, when the MCU 320 outputs a first control signal, the MCU 320 sets the control flag to 1, indicating that the current gain of the TIA component 310 is the first gain. When the MCU 320 outputs a second control signal, the MCU 320 sets the control flag to 0, indicating that the current gain of the TIA component 310 is the second gain. In one embodiment, the MCU 320 sets the initial value of the control flag based on the gain of the TIA component 310 in its initial state. For example, when the gain of the TIA component 310 in its initial state is the first gain, the initial value of the control flag is set to 1; when the gain of the TIA component 310 in its initial state is the second gain, the initial value of the control flag is set to 0.

[0159] In some embodiments of the present disclosure, MCU 320 also stores a first photovoltage threshold value, which is used to indicate that the gain of TIA component 310 is a first gain. When TIA component 310 outputs a photovoltage to MCU 320, MCU 320 collects and obtains the photovoltage value, and then compares the photovoltage value with the first photovoltage threshold value. If the photovoltage value is less than the first photovoltage threshold value and the current gain of TIA component 310 is the second gain, MCU 320 outputs a first control signal to TIA component 310 to adjust the gain of TIA component 310 to the first gain. Otherwise, MCU 320 does not output a control signal to TIA component 310, causing TIA component 310 to maintain its current gain.

[0160] In some embodiments of the present disclosure, the MCU 320 further stores a second photovoltage threshold. The second photovoltage threshold is a preset photovoltage value used by the MCU 320 to determine whether to adjust the gain of the TIA component 310 to a second gain. The second photovoltage threshold is greater than the first photovoltage threshold. When the TIA component 310 outputs a photovoltage to the MCU 320, the MCU 320 collects the photovoltage value and compares the photovoltage value with the first photovoltage threshold and the second photovoltage threshold. If the photovoltage value is less than the first photovoltage threshold and the current gain of the TIA component 310 is the second gain, the MCU 320 outputs a first control signal to the TIA component 310 to adjust the gain of the TIA component 310 to the first gain. If the photovoltage value is greater than the second photovoltage threshold and the current gain of the TIA component 310 is the first gain, the MCU 320 outputs a second control signal to the TIA component 310 to adjust the gain of the TIA component 310 to the second gain.

[0161] In some embodiments of the present disclosure, after comparing the photovoltage value with the first photovoltage threshold, or after comparing the photovoltage value with the second photovoltage threshold, MCU 320 reads the control flag. If the photovoltage value is less than the first photovoltage threshold and the control flag is 0, MCU 320 outputs a first control signal to TIA component 310. If the photovoltage value is greater than the second photovoltage threshold and the control flag is 1, MCU 320 outputs a second control signal to TIA component 310.

[0162] In some embodiments of the present disclosure, the calculation relationship of the received optical power is received optical power=photocurrent value / MPD responsivity, where the MPD responsivity is an attribute parameter of the MPD.

[0163] In some embodiments of the present disclosure, the photocurrent-to-voltage conversion relationship is: photocurrent = (photovoltage - TIA gain constant) / TIA gain; where TIA gain is the slope of the linear amplification function of the TIA component 310, and the TIA gain constant is the constant of the linear amplification function. The TIA gain and TIA gain constant are determined by the TIA component 310 itself and can be obtained using the linear amplification function formula of the TIA component 310: photovoltage = TIA gain * photocurrent + TIA gain constant. The first gain R1 corresponds to the TIA gain constant V01, and the second gain R2 corresponds to the TIA gain constant V02. The MCU 320 stores the photocurrent value calculated by photocurrent = (photovoltage - V01) / R1 and the photocurrent value calculated by photocurrent = (photovoltage - V02) / R2. Therefore, when the TIA component 310 uses the first gain, the MCU 320 calculates the photocurrent value using photocurrent value = (photovoltage value - V01) / R1; when the TIA component 310 uses the second gain, the MCU 320 calculates the photocurrent value using photocurrent value = (photovoltage value - V02) / R2.

[0164] In some embodiments of the present disclosure, when the MCU 320 samples and obtains a photovoltage value V, the MCU 320 compares the photovoltage value V with a first photovoltage threshold and compares the photovoltage value v with a second photovoltage threshold. If the photovoltage value v is less than the first photovoltage threshold and the current gain of the TIA component 310 is the second gain R2, the MCU 320 outputs a first control signal to the TIA component 310 to adjust the gain of the TIA component 310 to the first gain R1. The MCU 320 resamples and obtains a photovoltage value v1, calculates the photocurrent value I using the photocurrent value I = (v1-V01) / R1, and uses the responsivity of received optical power = photocurrent value I / MPD. If the photovoltage value v is less than the first photovoltage threshold and the current gain of the TIA component 310 is the first gain R1, the photocurrent value I is calculated using the photocurrent value I = (v-V01) / R1, and the received optical power is calculated using the responsivity of received optical power = photocurrent value I / MPD. If the photovoltage value v is greater than the second photovoltage threshold and the current gain of the TIA component 310 is the first gain R1, the MCU320 outputs a second control signal to the TIA component 310 to adjust the gain of the TIA component 310 to the second gain R2; the MCU320 resamples to obtain the photovoltage value v2, calculates the photocurrent value I through the photocurrent value I = (v2-V02) / R2, and obtains the received optical power using the responsiveness calculation of received optical power = photocurrent value I / MPD.

[0165] In some embodiments, when MCU320 samples and obtains a photovoltage value v, MCU320 compares the photovoltage value v with a first photovoltage threshold and compares the photovoltage value v with a second photovoltage threshold. If v is less than the first photovoltage threshold, the photocurrent value I is calculated using the photocurrent value I = (v-V01) / R1, and the received optical power is calculated using the responsivity calculation of received optical power = photocurrent value I / MPD. If v is greater than the second photovoltage threshold, the photocurrent value I is calculated using the photocurrent value I = (v2-V02) / R2, and the received optical power is calculated using the responsivity calculation of received optical power = photocurrent value I / MPD. If v is greater than or equal to the first photovoltage threshold and v is less than or equal to the second photovoltage threshold, the current gain of the TIA component 310 is first determined, and then the received optical power is calculated based on the current gain of the TIA component 310.

[0166] Based on the optical modules provided in the above embodiments, embodiments of the present disclosure further provide a method for monitoring received optical power. FIG16 is a flow chart of a method for monitoring received optical power provided in accordance with some embodiments of the present disclosure. As shown in FIG16 , the method for monitoring received optical power provided in embodiments of the present disclosure includes:

[0167] S100: Detecting the detection output terminal of the TIA to sample and obtain a photovoltage value.

[0168] S200: Compare the photovoltage value with a first photovoltage threshold, where the first photovoltage threshold is a preset photovoltage value for determining whether to adjust the gain of the TIA to a first gain.

[0169] S300: If the photovoltage value is less than the first photovoltage threshold and the current gain of the TIA is the second gain, send a first control signal to the TIA to enable the TIA to adjust the gain to the first gain.

[0170] S400: Resample to obtain a photovoltage value.

[0171] S500: Calculate the received optical power by combining the photovoltage value obtained by resampling, the responsivity of the MPD, the first gain, the gain constant corresponding to the first gain, the photocurrent-to-photovoltage conversion relationship, and the received optical power calculation relationship.

[0172] FIG17 is a flow chart of another method for monitoring received optical power according to some embodiments of the present disclosure. As shown in FIG17 , the method for monitoring received optical power according to some embodiments of the present disclosure further includes:

[0173] S610: Compare the photovoltage value with a second photovoltage threshold, where the second photovoltage threshold is a preset photovoltage value for determining whether to adjust the gain of the TIA to a second gain.

[0174] S620: If the photovoltage value is greater than the second photovoltage threshold and the current gain of the TIA is the first gain, sending a second control signal to the TIA to enable the TIA to adjust the gain to the second gain;

[0175] S630: resampling to obtain a photovoltage value;

[0176] S640: Calculate the received optical power by combining the resampled photovoltage value, the MPD responsivity, the second gain, the gain constant corresponding to the second gain, the photocurrent-to-photovoltage conversion relationship, and the received optical power calculation relationship.

[0177] In some embodiments of the present disclosure, if the photovoltage value is less than the first photovoltage threshold and the current gain of the TIA is the second gain, sending a first control signal to the TIA to cause the TIA to adjust the gain to the first gain includes:

[0178] If the photovoltage value is less than the first photovoltage threshold and the control flag is 0, a first control signal is sent to the TIA to enable the TIA to adjust the gain to a first gain, where the control flag is used to identify the current gain of the TIA.

[0179] FIG18 is a flow chart of another method for monitoring received optical power according to some embodiments of the present disclosure. As shown in FIG18 , in the method for monitoring received optical power according to some embodiments of the present disclosure, if the photovoltage value is less than the first photovoltage threshold and the current gain of the TIA is the second gain, a first control signal is sent to the TIA, and then the method further includes:

[0180] S700: Update the control flag to 1.

[0181] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in this application should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An optical module, comprising: Light receiving component, including: a photodetector configured to convert signal light into an electrical signal; an amplitude detector, whose input end is connected to the output end of the photodetector, and the amplitude detector is configured to detect the amplitude value of the amplified electrical signal; a compensation controller, whose input terminal is connected to the first output terminal of the amplitude detector, the compensation controller being configured to calculate a current voltage amplitude value according to the amplitude value, and output a balanced compensation value according to the current voltage amplitude value, the previous voltage amplitude value, the first compensation table, and the second compensation table; an equalizer, wherein a first input terminal is connected to the second output terminal of the amplitude detector, a second input terminal is connected to the output terminal of the compensation controller, and the equalizer is configured to perform equalization compensation on the electrical signal according to the equalization compensation value; The compensation controller is configured to: when the current voltage amplitude value is greater than or equal to the previous voltage amplitude value, output a balanced compensation value according to the first compensation table; When the current voltage amplitude value is less than the previous voltage amplitude value, outputting a balanced compensation value according to the second compensation table; and / or, the optical module further includes: circuit boards; MPD, electrically connected to the circuit board, configured to receive the detection light signal split by the light receiving component and output a photocurrent, wherein the detection light signal is used to monitor the received light power; A first transimpedance amplifier is provided on the circuit board, wherein a detection input terminal of the first transimpedance amplifier is connected to an output terminal of the MPD, and the gain of the first transimpedance amplifier processes the photocurrent; wherein the first transimpedance amplifier has a variable gain and the gain of the first transimpedance amplifier is switched according to a control signal received by a control terminal of the first transimpedance amplifier; An MCU is arranged on the circuit board, a sampling input end of the MCU is connected to the detection output end of the first transimpedance amplifier, and a control end of the MCU is connected to the control end of the first transimpedance amplifier, so as to send a control signal to the first transimpedance amplifier through the control end of the MCU; the MCU obtains a photovoltage value through the sampling input end, and calculates the received optical power using the photovoltage value and the current gain of the first transimpedance amplifier.

2. The optical module according to claim 1, wherein: The first compensation table includes: a first lower limit value, a first compensation value, and a second compensation value; The second compensation table includes: a second lower limit value, a first compensation value, and a second compensation value; wherein the first lower limit is greater than the second lower limit; The compensation controller is configured to: when the current voltage amplitude value is greater than or equal to the previous voltage amplitude value and the current voltage amplitude value is less than a first lower limit value, the output of the compensation controller is a first compensation value; When the current voltage amplitude value is greater than or equal to the previous voltage amplitude value and the current voltage amplitude value is greater than or equal to the first lower limit value, the output of the compensation controller is the second compensation value; When the current voltage amplitude value is smaller than the previous voltage amplitude value and the current voltage amplitude value is smaller than the second lower limit value, the output of the compensation controller is the first compensation value; When the current voltage amplitude value is smaller than the previous voltage amplitude value and the voltage amplitude value is greater than or equal to a second lower limit value, the output of the compensation controller is a second compensation value.

3. The optical module according to claim 1, wherein: The light receiving component further includes: a second transimpedance amplifier located between the amplitude detector and the photodetector.

4. The optical module according to claim 1, wherein: The calculating of the current voltage amplitude value according to the amplitude value includes: recording the ratio of the current amplitude value to the voltage limit value as the voltage amplitude value; The voltage limit is a preset value.

5. According to the optical module of claim 1, the photodetector includes a coherent optical component, which is configured to convert a received optical signal input to the optical module into an electrical signal; the MPD is located in the coherent optical component, and a splitter is also provided in the coherent optical component, and the received optical signal input to the coherent optical component is split into a beam of detection optical signals by the splitter and the detection optical signals are transmitted to the MPD.

6. The optical module according to claim 1, wherein: The MCU stores the MPD responsiveness, the first transimpedance amplifier gain, the first transimpedance amplifier gain constant, the photocurrent-to-light voltage conversion relationship, and the received optical power calculation relationship, so as to calculate the received optical power by combining the photovoltage value, the MPD responsiveness, the first transimpedance amplifier gain, the first transimpedance amplifier gain constant, the photocurrent-to-light voltage conversion relationship, and the received optical power calculation relationship.

7. The optical module according to claim 1, wherein: The first transimpedance amplifier includes an operational amplifier, a first resistor, a second resistor, and a control switch; the inverting input terminal of the operational amplifier is the detection input terminal of the first transimpedance amplifier, and the input terminal of the control switch is connected to the inverting input terminal of the operational amplifier; One end of the first resistor is connected to the first output end of the control switch, and the other end of the first resistor is connected to the output end of the operational amplifier; one end of the second resistor is connected to the second output end of the control switch, and the other end of the second resistor is connected to the output end of the operational amplifier; the output end of the operational amplifier is the detection output end of the first transimpedance amplifier component; the control end of the control switch is connected to the control end of the MCU.

8. The optical module according to claim 1, wherein: The MCU stores a first photovoltage threshold, which is a preset photovoltage value used by the MCU to determine whether to adjust the gain of the first transimpedance amplifier to a first gain. When the MCU obtains the preset photovoltage value, the MCU is configured to: comparing the photovoltage value with the first photovoltage threshold; If the photovoltage value is less than the first photovoltage threshold, a first control signal is sent to the first transimpedance amplifier to enable the first transimpedance amplifier to set the gain to a first gain.

9. The optical module according to claim 1, wherein: The MCU stores a first photovoltage threshold and a second photovoltage threshold, wherein the first photovoltage threshold is a preset photovoltage value used by the MCU to determine whether to adjust the gain of the first transimpedance amplifier to a first gain, and the second photovoltage is a preset photovoltage value used by the MCU to determine whether to adjust the gain of the first transimpedance amplifier to a second gain, and the second photovoltage threshold is greater than the first photovoltage threshold; When the MCU obtains the photovoltage value, the MCU is configured to: comparing the photovoltage value with the first photovoltage threshold, and comparing the photovoltage value with the second photovoltage threshold; If the photovoltage value is less than the first photovoltage threshold and the current gain of the first transimpedance amplifier is the second gain, sending a first control signal to the first transimpedance amplifier to adjust the gain of the first transimpedance amplifier to the first gain; If the photovoltage value is greater than the first photovoltage threshold and the current gain of the first transimpedance amplifier is the first gain, a second control signal is sent to the first transimpedance amplifier to adjust the gain of the first transimpedance amplifier to the second gain.

10. The optical module according to claim 9, wherein: A control identifier is stored in the MCU, and the control identifier is used to indicate the current gain of the first transimpedance amplifier; After the MCU compares the photovoltage value with the first photovoltage threshold and the photovoltage value with the second photovoltage threshold, it reads the control identifier to confirm the current state of the first transimpedance amplifier according to the control identifier. Gain.

11. The optical module according to claim 10, wherein: The MCU is configured as: comparing the photovoltage value with the first photovoltage threshold, and comparing the photovoltage value with the second photovoltage threshold; If the photovoltage value is less than the first photovoltage threshold and the control flag is 0, sending a first control signal to the first transimpedance amplifier to adjust the gain of the first transimpedance amplifier to a first gain; If the photovoltage value is greater than the first photovoltage threshold and the control flag is 1, a second control signal is sent to the first transimpedance amplifier to enable the first transimpedance amplifier to adjust the gain to a second gain.

12. A method for monitoring received optical power, comprising: detecting a detection output terminal of the first transimpedance amplifier to sample and obtain a photovoltage value; comparing the photovoltage value with a first photovoltage threshold, where the first photovoltage threshold is a preset photovoltage value for determining whether to adjust the gain of the first transimpedance amplifier to a first gain; If the photovoltage value is less than the first photovoltage threshold and the current gain of the first transimpedance amplifier is the second gain, sending a first control signal to the first transimpedance amplifier to adjust the gain of the first transimpedance amplifier to the first gain; Resample to obtain the photovoltage value; The received optical power is calculated by combining the photovoltage value obtained by resampling, the responsivity of the MPD, the first gain, the gain constant corresponding to the first gain, the photocurrent-to-photovoltage conversion relationship, and the received optical power calculation relationship.

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