CN114142939B

CN114142939B - Optical module and optical module LOS optimization method

Info

Publication number: CN114142939B
Application number: CN202111511278.1A
Authority: CN
Inventors: 李福宾; 朱晓勐; 薛登山
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2023-08-08
Anticipated expiration: 2041-12-03
Also published as: CN114142939A

Abstract

The application discloses an optical module and an optical module LOS optimization method, comprising the following steps: the photodetector is used for converting the optical signal into an electrical signal. The limiting amplifier is provided with an LOS signal pin and is used for outputting high level or low level; an APD boost circuit comprising: a control interface; the power supply interface is connected with the optical detector; and an output interface for outputting the power signal of the optical signal. An MCU, comprising: the detection pin is connected with the output interface and receives the power signal; an input pin connected with the limiting amplifier and used for receiving a high level or the low level; the adjusting pin is connected with the control interface, and a power signal monitoring value is arranged in the MCU; when the operation judges that the power signal is smaller than the monitoring value and the input pin receives high level, the regulating pin sends out a signal to the control interface to supply the output voltage of the interface to rise, or the limiting and releasing regulating pin sends out a regulating signal to the limiting and releasing regulating end to reduce the LOS threshold, so that the LOS performance of the optical module is optimized.

Description

Optical module and optical module LOS optimization method

Technical Field

The application relates to the technical field of communication, in particular to an optical module and an optical module LOS optimization method.

Background

With the development of new business and application modes such as cloud computing, mobile internet, video and the like, the development and progress of optical communication technology become more and more important. In the optical communication technology, the optical module is a tool for realizing the mutual conversion of photoelectric signals, and is one of key devices in optical communication equipment.

One type of optical module in application has low speed, but requires long transmission distance. The sensitivity, LOSD, LOSA, LOSH, and the like of the light receiving end approach the limit because of the long-distance transmission. When the received optical power is very small, the amplitude of an electric signal generated by converting the optical signal by the optical detector is small, and a certain reject ratio exists, so that the cost of the optical module is lost.

Disclosure of Invention

The application provides an optical module and an optical module LOS optimization method for optimizing LOS performance of the optical module.

In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:

in one aspect, an embodiment of the present application discloses an optical module, including:

a photodetector for converting the optical signal into an electrical signal;

the limiting amplifier is provided with an LOS signal pin for outputting high level or low level and a limiting amplifier regulation end;

an APD boost circuit comprising:

A control interface;

the power supply interface is connected with the optical detector and is used for supplying power to the optical detector;

an output interface outputting a power signal of the optical signal;

an MCU, comprising:

the detection pin is connected with the output interface and receives the power signal;

an input pin connected to the limiting amplifier for receiving the high level or the low level;

an APD adjusting pin connected with the control interface;

the limiting and discharging adjusting pin is connected with the limiting and discharging adjusting end;

the MCU is internally provided with a power signal monitoring value; when the operation judges that the power signal is smaller than the monitoring value and the input pin receives the high level, the APD adjusting pin sends a signal to the control interface, the output voltage of the power supply interface is increased, or the limiting and releasing adjusting pin sends a regulating signal to the limiting and releasing adjusting end to reduce an LOS threshold.

Compared with the prior art, the beneficial effect of this application:

the application discloses optical module includes: the photodetector is used for converting the optical signal into an electrical signal. The limiting amplifier is provided with an LOS signal pin and is used for outputting high level or low level; an APD boost circuit comprising: a control interface; the power supply interface is connected with the optical detector and is used for supplying power to the optical detector; and the output interface outputs the power signal of the optical signal. An MCU, comprising: the detection pin is connected with the output interface and receives the power signal; an input pin connected to the limiting amplifier for receiving the high level or the low level; the adjusting pin is connected with the control interface, and a power signal monitoring value is arranged in the MCU; when the operation judges that the power signal is smaller than the monitoring value, the input pin receives the high level, the regulating pin sends a signal to the control interface, the output voltage of the power supply interface is increased, or the limiting and releasing regulating pin sends a regulating signal to the limiting and releasing regulating end to reduce an LOS threshold. In the application, the MCU monitors the magnitude of the received optical power through the power signal, when the optical power is smaller than a preset optical power threshold value and the limiting amplifier is confirmed not to report the LOS signal, the LOS threshold of the limiting amplifier is reduced by a preset value or the output voltage of the APD booster circuit is increased, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the LOS threshold of the limiting amplifier to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the value of the LOSH is increased. And the MCU is used for flexibly configuring proper values of the current threshold and the LOS threshold reduction value, so that the LOS performance of the optical module is optimized.

On the other hand, the embodiment of the application also discloses an optical module LOS optimization method, which comprises the following steps:

calculating the current optical power according to the power signal;

the current optical power is not smaller than a preset optical power threshold, and the LOS threshold of the limiting amplifier is controlled to be a first LOSA threshold, or the output voltage of the APD boosting circuit is controlled to be a first output voltage;

the current optical power is smaller than the preset optical power threshold value, LOS signals are not received, the LOS threshold of the limiting amplifier is controlled to be a second LOSA threshold value, or the output voltage of the APD booster circuit is controlled to be a second output voltage;

the current optical power is smaller than a preset optical power threshold, the LOS signal is received, the LOS threshold of the limiting amplifier is controlled to be a first LOSA threshold, or the output voltage of the APD booster circuit is controlled to be the first output voltage;

wherein the first LOSA threshold is higher than the second LOSA threshold; the second output voltage is higher than the first output voltage.

Compared with the prior art, the beneficial effect of this application:

the application discloses an LOS optimization method, which comprises the following steps: calculating the current optical power according to the power signal; the current optical power is not smaller than a preset optical power threshold, and the LOS threshold of the limiting amplifier is controlled to be a first LOSA threshold, or the output voltage of the APD booster circuit is controlled to be a first output voltage; the current optical power is smaller than the preset optical power threshold value, LOS signals are not received, the LOS threshold of the limiting amplifier is controlled to be a second LOSA threshold value, or the output voltage of the APD booster circuit is controlled to be a second output voltage; the current optical power is smaller than a preset optical power threshold, the LOS signal is received, the LOS threshold of the limiting amplifier is controlled to be a first LOSA threshold, or the output voltage of the APD booster circuit is controlled to be the first output voltage; wherein the first LOSA threshold is higher than the second LOSA threshold and the second output voltage is higher than the first output voltage. In this embodiment of the present application, the magnitude of the received optical power is monitored by the power signal, and when the optical power is less than a preset optical power threshold value and it is confirmed that the limiting amplifier does not report the LOS signal, the LOS threshold of the limiting amplifier is reduced by a preset value or the output voltage of the APD booster circuit is increased, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the LOS threshold of the limiting amplifier to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the value of the LOSH is increased. The LOS performance of the optical module is optimized by flexibly configuring appropriate values of the current threshold and LOS threshold reduction values.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

Fig. 1 is a connection diagram of an optical communication system according to some embodiments;

fig. 2 is a block diagram of an optical network terminal according to some embodiments;

FIG. 3 is a block diagram of an optical module according to some embodiments;

fig. 4 is an exploded view of a light module according to some embodiments;

fig. 5 is a schematic structural diagram of a circuit board in an optical module according to an embodiment of the present application;

fig. 6 is a schematic diagram of a light receiving sub-module according to an embodiment of the present application;

fig. 7 is a schematic diagram of another light receiving sub-module according to an embodiment of the present application;

fig. 8 is a schematic diagram of another light receiving sub-module according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled (communicatively coupled)" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

In the optical communication technology, light is used to carry information to be transmitted, and an optical signal carrying the information is transmitted to an information processing device such as a computer through an information transmission device such as an optical fiber or an optical waveguide, so as to complete the transmission of the information. Since the optical signal has a passive transmission characteristic when transmitted through an optical fiber or an optical waveguide, low-cost and low-loss information transmission can be realized. Further, since a signal transmitted by an information transmission device such as an optical fiber or an optical waveguide is an optical signal and a signal that can be recognized and processed by an information processing device such as a computer is an electrical signal, it is necessary to perform mutual conversion between the electrical signal and the optical signal in order to establish an information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer.

The optical module realizes the function of interconversion between the optical signal and the electric signal in the technical field of optical fiber communication. The optical module comprises an optical port and an electric port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides through the optical port, realizes electric connection with an optical network terminal (for example, optical cat) through the electric port, and is mainly used for realizing power supply, I2C signal transmission, data signal transmission, grounding and the like; the optical network terminal transmits the electric signal to information processing equipment such as a computer through a network cable or wireless fidelity (Wi-Fi).

Fig. 1 is a connection diagram of an optical communication system according to some embodiments. As shown in fig. 1, the optical communication system mainly includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101, and a network cable 103;

one end of the optical fiber 101 is connected to the remote server 1000, and the other end is connected to the optical network terminal 100 through the optical module 200. The optical fiber itself can support long-distance signal transmission, such as signal transmission of several kilometers (6-8 kilometers), on the basis of which, if a repeater is used, it is theoretically possible to realize ultra-long-distance transmission. Thus, in a typical optical communication system, the distance between the remote server 1000 and the optical network terminal 100 may typically reach several kilometers, tens of kilometers, or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000, and the other end is connected to the optical network terminal 100. The local information processing apparatus 2000 may be any one or several of the following: routers, switches, computers, cell phones, tablet computers, televisions, etc.

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing apparatus 2000 and the optical network terminal 100. The connection between the local information processing device 2000 and the remote server 1000 is completed by an optical fiber 101 and a network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical module 200 and the optical network terminal 100.

The optical module 200 includes an optical port and an electrical port. The optical port is configured to connect with the optical fiber 101 such that the optical module 200 establishes a bi-directional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100 such that the optical module 200 establishes a bi-directional electrical signal connection with the optical network terminal 100. The optical module 200 performs mutual conversion between optical signals and electrical signals, so that a connection is established between the optical fiber 101 and the optical network terminal 100. For example, an optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100, and an electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101.

The optical network terminal 100 includes a substantially rectangular parallelepiped housing (housing), and an optical module interface 102 and a network cable interface 104 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 and the optical module 200 establish a bidirectional electrical signal connection; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. A connection is established between the optical module 200 and the network cable 103 through the optical network terminal 100. By way of example, since the optical network terminal 100 transmits an electrical signal from the optical module 200 to the network cable 103 and transmits a signal from the network cable 103 to the optical module 200, the optical network terminal 100 can monitor the operation of the optical module 200 as a host computer of the optical module 200. The upper computer of the optical module 200 may include an optical line terminal (Optical Line Terminal, OLT) or the like in addition to the optical network terminal 100.

The remote server 1000 establishes a bidirectional signal transmission channel with the local information processing device 2000 through the optical fiber 101, the optical module 200, the optical network terminal 100 and the network cable 103.

Fig. 2 is a block diagram of an optical network terminal according to some embodiments, and fig. 2 only shows a structure of the optical network terminal 100 related to the optical module 200 in order to clearly show a connection relationship between the optical module 200 and the optical network terminal 100. As shown in fig. 2, the optical network terminal 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on a surface of the PCB circuit board 105, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a convex portion such as a fin that increases the heat dissipation area.

The optical module 200 is inserted into the cage 106 of the optical network terminal 100, the optical module 200 is fixed by the cage 106, and heat generated by the optical module 200 is transferred to the cage 106 and then diffused through the heat sink 107. After the optical module 200 is inserted into the cage 106, the electrical port of the optical module 200 is connected with an electrical connector inside the cage 106, so that the optical module 200 establishes a bi-directional electrical signal connection with the optical network terminal 100. In addition, the optical port of the optical module 200 is connected to the optical fiber 101, so that the optical module 200 establishes a bi-directional electrical signal connection with the optical fiber 101.

Fig. 3 is a block diagram of an optical module according to some embodiments, and fig. 4 is an exploded view of an optical module according to some embodiments. As shown in fig. 3 and 4, the optical module 200 includes a housing, a circuit board 300 disposed in the housing, and an optical transceiver;

the housing includes an upper housing 201 and a lower housing 202, the upper housing 201 being capped on the lower housing 202 to form the above-described housing having two openings 204 and 205; the outer contour of the housing generally presents a square shape.

In some embodiments of the present disclosure, the lower housing 202 includes a bottom plate and two lower side plates disposed at both sides of the bottom plate and perpendicular to the bottom plate; the upper case 201 includes a cover plate, and two upper side plates disposed at two sides of the cover plate and perpendicular to the cover plate, and two side walls are combined with the two side plates to realize that the upper case 201 is covered on the lower case 202.

The direction of the connection line of the two openings 204 and 205 may be identical to the length direction of the optical module 200 or not identical to the length direction of the optical module 200. Illustratively, opening 204 is located at the end of light module 200 (left end of fig. 3) and opening 205 is also located at the end of light module 200 (right end of fig. 3). Alternatively, the opening 204 is located at the end of the light module 200, while the opening 205 is located at the side of the light module 200. The opening 204 is an electrical port, and the golden finger of the circuit board 300 extends out of the electrical port 204 and is inserted into an upper computer (such as the optical network terminal 100); the opening 205 is an optical port configured to be connected to the external optical fiber 101, so that the optical fiber 101 is connected to the optical transceiver 400 inside the optical module 200.

By adopting the assembly mode of combining the upper shell 201 and the lower shell 202, devices such as the circuit board 300, the optical transceiver and the like are conveniently installed in the shell, and the upper shell 201 and the lower shell 202 can form packaging protection for the devices. In addition, when devices such as the circuit board 300 are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component of the devices are conveniently arranged, and the automatic implementation and production are facilitated.

In some embodiments, the upper housing 201 and the lower housing 202 are generally made of metal materials, which is beneficial to electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking member 203 located on an outer wall of the housing, and the unlocking member 203 is configured to achieve a fixed connection between the optical module 200 and the host computer, or release the fixed connection between the optical module 200 and the host computer.

Illustratively, the unlocking member 203 is located on the outer walls of the two lower side plates 2022 of the lower housing 202, and includes an engagement member that mates with a cage of an upper computer (e.g., the cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the clamping component of the unlocking component 203; when the unlocking member 203 is pulled, the engaging member of the unlocking member 203 moves along with the unlocking member, so as to change the connection relationship between the engaging member and the host computer, so as to release the engagement relationship between the optical module 200 and the host computer, and thus the optical module 200 can be pulled out from the cage of the host computer.

The circuit board 300 includes circuit traces, electronic components and chips, which are connected together by the circuit traces according to a circuit design to realize functions such as power supply, electrical signal transmission, and grounding. The electronic components may include, for example, capacitors, resistors, transistors, metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). The chips may include, for example, a micro control unit (Microcontroller Unit, MCU), limiting amplifier (limiting amplifier), clock data recovery chip (Clock and Data Recovery, CDR), power management chip, digital signal processing (Digital Signal Processing, DSP) chip.

The circuit board 300 is generally a hard circuit board, and the hard circuit board can also realize a bearing function due to the relatively hard material, for example, the hard circuit board can stably bear chips; the hard circuit board can also be inserted into an electrical connector in the upper computer cage.

The circuit board 300 further includes a gold finger 301 formed on an end surface thereof, the gold finger 301 being composed of a plurality of pins independent of each other. The circuit board 300 is inserted into the cage 106 and is conductively connected to the electrical connectors within the cage 106 by the gold fingers 301. The golden finger 301 may be disposed on only one surface (such as the upper surface shown in fig. 4) of the circuit board 300, or may be disposed on both upper and lower surfaces of the circuit board 300, so as to adapt to the situation where the pin number is large. The golden finger 301 is configured to establish electrical connection with an upper computer to achieve power supply, grounding, I2C signal transfer, data signal transfer, and the like. Of course, flexible circuit boards may also be used in some optical modules. The flexible circuit board is generally used in cooperation with the rigid circuit board to supplement the rigid circuit board.

The optical transceiver device comprises an optical transmitting sub-module and an optical receiving sub-module.

The optical module for long-distance transmission has higher index requirement on the sensitivity of the optical receiving sub-module, so that the optical receiving sub-module needs to work in a very small receiving optical power range, and meanwhile, the LOS threshold needs to be very small, and certain hysteresis between LOSD and LOSA needs to be ensured. The present application is presented for optimizing LOS index of the light receiving sub-module.

Fig. 5 is a schematic structural diagram of a circuit board in an optical module according to an embodiment of the present application. As shown in fig. 5, in the optical module provided in the embodiment of the present application, the circuit board 300 further includes an MCU301. In this embodiment, the MCU301 is connected to the photodetector and the limiting amplifier, and is configured to monitor the optical power of the photodetector and the LOS signal of the limiting amplifier, and adjust the working voltage of the photodetector.

Fig. 6 is a schematic diagram of a light receiving sub-module according to an embodiment of the present application. As shown in the drawing, the light receiving sub-module includes: the light detector receives the optical signal and converts the optical signal into an electrical signal. And the first end of the APD boosting circuit is connected with the optical detector to provide reverse working voltage for the optical detector. The second end of the APD voltage boosting circuit is connected with the first end of the MCU and is used for outputting a power signal of the received optical signal to the MCU. The second end of the MCU is connected with the third end of the APD voltage boosting circuit, outputs a control signal to the APD voltage boosting circuit, and controls the output voltage of the APD voltage boosting circuit. The optical detector is also connected with a limiting amplifier for amplifying the optical signal output by the optical detector and outputting the amplified electric signal to the upper computer. The limiting amplifier is also connected with the MCU. The third end of MCU is connected with limiting amplifier, receives LOS signal.

And the limiting amplifier is provided with an LOS signal pin and is used for outputting a high level or a low level. And the limiting amplifier is provided with a signal input end which is connected with the optical detector and receives the electric signal output by the optical detector. An LOS threshold is arranged in the limiting amplifier; and when the operation judges that the electric signal is smaller than the LOS threshold, outputting a high level. Otherwise, a low level is output. In this embodiment of the present application, the LOS signal pin of the limiting amplifier outputs a high level, that is, a LOS signal.

In order to increase the detection light power range of the light detector, in the embodiment provided by the application, a register is built in the MCU, and a value is monitored in the register. The MCU adjusts a control signal output to the APD booster circuit according to the power signal, and controls the output voltage of the APD booster circuit.

Specifically, a first end of the APD boost circuit is connected to an APD pin of the photodetector for providing a reverse operating high voltage to the APD photodiode.

Specifically, the first end of the APD booster circuit is a power supply interface, the second end is an output interface, and the third end is a control interface. The first end of MCU is the detection pin, and the second end is the regulation pin, and the third end is the input pin, and the fourth end is the regulation pin of putting. The first end of the limiting amplifier is a signal input end, the second end is an LOS signal pin, the third end is an amplifying control end, and the fourth end is an amplifying output end.

In the embodiment of the application, the APD booster circuit is provided with a current mirror circuit, and the current flowing into the photodetector is output to the MCU according to a certain proportion so as to monitor the photocurrent detected by the photodetector, and a power signal is formed and transmitted to the MCU.

The second end of the MCU is connected with the third end of the APD voltage boosting circuit, outputs a control signal to the APD voltage boosting circuit, and controls the output voltage of the APD voltage boosting circuit. When the power signal received by the MCU is lower than the monitoring value, the output voltage of the APD boosting circuit is controlled to be increased by a certain preset voltage setting value. According to the working principle of the optical detector, the output voltage of the APD booster circuit is increased, the output amplitude of the optical detector is increased, and LOS performance is optimized.

The monitoring value can be set according to the comparison condition of the power signal and the optical power. Typically the monitored value corresponds to an optical power that is greater than the minimum optical power that the light detector is capable of detecting.

Further, the MCU is configured to: and if the power signal is smaller than the monitoring value and the LOS signal is not received, the output voltage of the APD boosting circuit is controlled to be increased. The output voltage of the APD boosting circuit is increased, the minimum value of the detection light power of the photodetector is smaller than that before boosting, LOS performance is optimized, and LOS function optimization of the light receiving sub-module is realized.

If the output voltage of the APD booster circuit keeps in an increased state for a long time, the damage to the photodetector is larger, and after the MCU receives the LOS signal, the output voltage of the APD booster circuit is controlled to restore to the original output. That is, when the power signal received by the MCU is lower than the monitoring value and the LOS signal is not received, outputting a second control signal to control the output voltage of the APD boosting circuit to be a second output voltage; after receiving the LOS signal, the MCU outputs a first control signal to control the output voltage of the APD booster circuit to be a first output voltage. The difference between the first output voltage and the second output voltage of the APD voltage boosting circuit is a preset voltage set value.

An LOS threshold is set in the limiting amplifier, and whether an LOS signal is output or not is judged. In the embodiment of the application, when the output voltage of the photodetector is smaller than the LOS threshold, the limiting amplifier outputs an LOS signal.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using the power signal, and when the optical power is smaller than a preset optical power threshold value and it is confirmed that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by a preset voltage set value, so that the optical power value corresponding to the value of the LOSA is reduced (when the preset voltage set value is not increased in comparison). When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value (namely, the preset voltage set value is not increased any more), and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the value of the LOSH is increased.

The scheme optimizes the software level on the basis of the existing and conventional hardware scheme without increasing any cost, but can effectively solve the problem of too small LOSH, and can flexibly configure proper values of the monitoring value and the preset voltage set value through the MCU according to own needs to optimize LOS performance.

In the application, the optical power received by the optical detector is attenuated to be small light gradually, when the LOS signal voltage jumps from low level to high level, the LOS signal is obtained, and the corresponding optical power is LOSA; the optical power received by the optical detector is gradually increased to be high, and when the LOS signal voltage jumps from high level to low level, the LOS signal is released, and the corresponding optical power is LOSD. The value of LOSD minus LOSA is LOSH.

In some embodiments of the present application, an optical power threshold and a table for comparing the power signal with the optical power may be preset in the register, and the MCU converts the received current power signal into the current optical power according to the table for comparing the power signal with the optical power. The MCU is configured to: and if the current optical power is smaller than the preset optical power threshold value and the LOS signal is not received, controlling the output voltage of the APD boosting circuit to increase. The output voltage of the APD boosting circuit is increased, the minimum value of the detection light power of the photodetector is smaller than that before boosting, LOS performance is optimized, and LOS function optimization of the light receiving sub-module is realized.

In the embodiment of the present application, the register may be built in the MCU, or may be disposed outside the MCU, which is not limited specifically.

And after the MCU receives the LOS signal, controlling the output voltage of the APD boosting circuit to restore the original output. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold value and the LOS signal is not received, outputting a second control signal, and controlling the output voltage of the APD booster circuit to be a second output voltage; after receiving the LOS signal, the MCU outputs a first control signal to control the output voltage of the APD booster circuit to be a first output voltage. The difference between the first output voltage and the second output voltage of the APD voltage boosting circuit is a preset voltage set value.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using a power signal, and when the optical power is smaller than a preset optical power threshold value and it is confirmed that the limiting amplifier does not report the LOS signal, increases the high voltage output by the APD booster circuit by a preset voltage setting value, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS index of the optical module is optimized.

Corresponding to the device, the application also provides an optical module LOS optimization method, which comprises the following steps:

the current optical power is not smaller than a preset optical power threshold value, and the output voltage of the APD booster circuit is controlled to be a first output voltage;

the current optical power is smaller than a preset optical power threshold value, an LOS signal is not received, and the output voltage of the APD boosting circuit is controlled to be a second output voltage;

the current optical power is smaller than a preset optical power threshold, and the output voltage of the APD boosting circuit is controlled to be a first output voltage after the LOS signal is received.

The second output voltage is higher than the first output voltage.

The optical module LOS optimization method provided by the application comprises the following steps: the current optical power is smaller than a preset optical power threshold value, an LOS signal is not received, and the MCU controls the output voltage of the APD booster circuit to be a second output voltage; the current optical power is not smaller than a preset optical power threshold value, or the current optical power is smaller than the preset optical power threshold value and an LOS signal is received, and the MCU controls the output voltage of the APD boosting circuit to be a first output voltage; wherein the second output voltage is higher than the first output voltage. The MCU monitors the received optical power through a power signal, when the optical power is smaller than a preset optical power threshold value and confirms that the limiting amplifier does not report an LOS signal, the high voltage output by the APD booster circuit is increased by a preset voltage set value, and at the moment, the high voltage output by the APD booster circuit is a second output voltage, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance is optimized.

Further, in some embodiments of the present application, the optical module LOS optimization method is applicable to an optical receiving sub-module, and to implement the above method, the optical receiving sub-module includes: the light detector receives the optical signal and converts the optical signal into an electrical signal. And the first end of the APD boosting circuit is connected with the optical detector to provide reverse working voltage for the optical detector. The second end of the APD voltage boosting circuit is connected with the first end of the MCU and is used for outputting a power signal to the MCU and monitoring optical power. The second end of the MCU is connected with the third end of the APD voltage boosting circuit, outputs a control signal to the APD voltage boosting circuit, and controls the output voltage of the APD voltage boosting circuit. The optical detector is also connected with a limiting amplifier for amplifying the optical signal output by the optical detector, and the limiting amplifier outputs the amplified electric signal to the upper computer. The limiting amplifier is also connected with the MCU. The third end of MCU is connected with limiting amplifier, receives LOS signal.

The MCU is configured to: receiving a power signal of the photodetector, wherein the power signal of the current optical power is smaller than a preset optical power threshold value, and an LOS signal is not received, and controlling the output voltage of the APD booster circuit to be a second output voltage;

the current optical power is not smaller than a preset optical power threshold value, or the current optical power is smaller than the preset optical power threshold value and an LOS signal is received, and the output voltage of the APD boosting circuit is controlled to be a first output voltage; wherein the second output voltage is higher than the first output voltage.

In order to optimize LOS performance and increase the optical power range detected by the optical detector, in the embodiment provided by the application, the MCU can judge whether the power signal of the current optical power is smaller than the preset optical power threshold value according to the comparison between the received power signal and the monitored value. If the power signal is smaller than the monitoring value, judging that the power signal of the current optical power is smaller than a preset optical power threshold value. The value is monitored in the register. The MCU adjusts a control signal output to the APD booster circuit according to the power signal, and controls the output voltage of the APD booster circuit.

The second end of the MCU is connected with the third end of the APD voltage boosting circuit, outputs a control signal to the APD voltage boosting circuit, and controls the output voltage of the APD voltage boosting circuit. When the power signal received by the MCU is lower than the monitoring value, the output voltage of the APD boosting circuit is controlled to be increased by a certain preset voltage setting value. According to the working principle of the optical detector, the output voltage of the APD booster circuit is increased, and the output amplitude of the optical detector is increased.

The monitoring value can be set according to the comparison condition of the power signal and the optical power. The optical power corresponding to the monitor value is generally greater than the optical power value corresponding to the LOSA at the first output voltage.

If the output voltage of the APD booster circuit keeps in an increased state for a long time, the MCU receives the LOS signal and then controls the output voltage of the APD booster circuit to restore the original output. That is, when the power signal received by the MCU is lower than the monitoring value and the LOS signal is not received, outputting a second control signal to control the output voltage of the APD boosting circuit to be a second output voltage; after receiving the LOS signal, the MCU outputs a first control signal to control the output voltage of the APD booster circuit to be a first output voltage. The difference between the first output voltage and the second output voltage of the APD voltage boosting circuit is a preset voltage set value.

An LOS threshold is set in the limiting amplifier, and whether an LOS signal is output or not is judged. In the embodiment of the application, when the output voltage of the photodetector is smaller than the LOS threshold, the limiting amplifier outputs an LOS signal. The LOS threshold comprises an LOSA threshold and an LOSD threshold, and when the output voltage of the optical detector is smaller than the LOSA threshold, the limiting amplifier outputs an LOS signal; when the output voltage of the photodetector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using the power signal, and when the optical power is smaller than a fixed value and it is confirmed that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by a preset voltage fixed value, so that the optical power value corresponding to the value of the LOSA is reduced (when the preset voltage fixed value is not increased in comparison). When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value (namely, the preset voltage set value is not increased any more), and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the value of the LOSH is increased.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using a power signal, and when the optical power is smaller than a fixed value and it is confirmed that the limiting amplifier does not report the LOS signal, increases the high voltage output by the APD booster circuit by a preset voltage fixed value, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance is optimized.

The optical module LOS optimization method provided by the application comprises the following steps:

monitoring current optical power, and comparing the current optical power with a preset optical power threshold value;

And collecting LOS signals, comparing the current optical power with a preset optical power threshold value, and selecting an output voltage value of the APD booster circuit according to the LOS signals.

Specifically, if the current optical power is greater than or equal to a preset optical power threshold, the APD booster circuit outputs a first output voltage. If the current optical power is smaller than the preset optical power threshold value and the LOS signal is not received, the MCU controls the output voltage of the APD booster circuit to be the second output voltage. And if the LOS signal is received, the MCU controls the output voltage of the APD boosting circuit to be the first output voltage. Wherein the second output voltage is higher than the first output voltage. The MCU monitors the received optical power through a power signal, when the optical power is smaller than a preset optical power threshold value and confirms that the limiting amplifier does not report an LOS signal, the high voltage output by the APD booster circuit is increased by a preset voltage set value, and at the moment, the high voltage output by the APD booster circuit is a second output voltage, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance is optimized.

Fig. 7 is a schematic diagram of another light receiving sub-module according to an embodiment of the present application. As shown in the drawing, the light receiving sub-module includes: the light detector receives the optical signal and converts the optical signal into an electrical signal. And the first end of the APD boosting circuit is connected with the optical detector to provide reverse working voltage for the optical detector. The second end of the APD voltage boosting circuit is connected with the first end of the MCU and used for outputting a power signal to the MCU and monitoring optical power. The optical detector is also connected with a limiting amplifier for amplifying the optical signal output by the optical detector and outputting the amplified electric signal to the upper computer. The limiting amplifier is also connected with the MCU. The fourth end of the MCU is connected with a limiting amplifier and receives an LOS signal.

The first end of the limiting amplifier is connected with the output end of the optical detector and is used for receiving the electric signal of the optical detector and amplifying the electric signal. The second end of the limiting amplifier is connected with the fourth end of the MCU and is used for sending LOS signals to the MCU. And the third end of the limiting amplifier is connected with the third end of the MCU and is used for receiving the control signal of the MCU. The MCU receives the LOS signal and sends a control signal according to the LOS signal, and the control signal is used for adjusting the LOS threshold value set in the limiting amplifier. In order to increase the detection light power range of the light detector, in the embodiment provided by the application, a register is built in the MCU, and a light power threshold value is preset in the register. The MCU adjusts the control signal output to the limiting amplifier according to the power signal, and adjusts the LOS threshold.

In the embodiment of the application, the APD booster circuit is provided with a current mirror circuit, and the current flowing into the photodetector is output to the MCU according to a certain proportion so as to monitor the photocurrent detected by the photodetector, and a power signal is formed and transmitted to the MCU. And the MCU adjusts an LOS threshold value in the limiting amplifier according to the magnitude of the power signal and the LOS signal.

The LOS threshold in the limiting amplifier adopts DAC value, and MCU outputs control signal to regulate the LOS threshold.

And when the power signal received by the MCU is lower than the current threshold value, controlling and adjusting the LOS threshold value to be smaller. According to the working principle of the limiting amplifier, the LOS threshold value is reduced, the optical power value corresponding to the triggering LOS signal is reduced, and the LOS performance of the optical module is optimized.

The preset current threshold value can be set according to the comparison condition of the power signal and the optical power. Typically the current threshold corresponds to an optical power that is greater than the minimum optical power that the photodetector can detect.

An LOS threshold is set in the limiting amplifier, and whether an LOS signal is output or not is judged. In the embodiment of the application, the LOS threshold comprises an LOSA threshold and an LOSD threshold, and when the output voltage of the optical detector is smaller than the LOSA threshold, the limiting amplifier outputs an LOS signal; when the output voltage of the photodetector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

Further, the MCU is configured to: the power signal is less than the current threshold and no LOS signal is received, the LOS threshold controlling the limiting amplifier is reduced. The LOSA threshold is reduced, the optical power corresponding to the triggering LOS signal is reduced before being changed compared with the LOSA threshold, and the LOS function optimization of the optical receiving sub-module is realized.

And after the MCU receives the LOS signal, controlling the LOS threshold value of the limiting amplifier to recover. That is, when the power signal received by the MCU is lower than the current threshold and the LOS signal is not received, outputting a second control signal, and controlling the LOSA threshold to be a second LOSA threshold; after receiving the LOS signal, the MCU outputs a first control signal, and controls the LOSA threshold to be a first LOSA threshold. The first LOSA threshold of the limiting amplifier is greater than the second LOSA threshold.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using a power signal, and when the optical power is less than a preset optical power threshold and it is confirmed that the limiting amplifier does not report an LOS signal, the LOS threshold of the limiting amplifier is reduced, so that the optical power value corresponding to the value of the LOS is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold of the limiting amplifier to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the value of the LOSH is increased.

The scheme optimizes the software level on the basis of the existing and conventional hardware scheme without increasing any cost, but can effectively solve the problem of too small LOSH, and can flexibly configure proper values of a current threshold and a LOSA threshold through the MCU according to own needs to optimize the LOS performance of the optical module.

In some embodiments of the present application, an optical power threshold and a table for comparing the power signal with the optical power may be preset in the register, and the MCU converts the received current power signal into the current optical power according to the table for comparing the power signal with the optical power. The MCU is configured to: and if the current optical power is smaller than the preset optical power threshold value and the LOS signal is not received, the LOSA threshold of the limiting amplifier is controlled to be reduced. The LOSA threshold of the limiting amplifier is reduced, the minimum value of the detection light power of the light detector is smaller than that before the change, and the LOS function optimization of the light receiving sub-module is realized.

And after the MCU receives the LOS signal, the LOSA threshold of the limiting amplifier is controlled to restore the original output. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold and the LOS signal is not received, outputting a second control signal, and controlling the LOSA threshold of the limiting amplifier to be the second LOSA threshold; after receiving the LOS signal, the MCU outputs a first control signal, and controls the LOSA threshold of the limiting amplifier to be the first LOSA threshold. The optical power corresponding to the second LOSA threshold of the limiting amplifier is less than the optical power corresponding to the second LOSA threshold.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using a power signal, and when the optical power is less than a preset optical power threshold and it is confirmed that the limiting amplifier does not report an LOS signal, the LOS threshold of the limiting amplifier is reduced by a preset value, so that the optical power value corresponding to the value of the LOS is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance of the optical module is optimized.

Corresponding to the device, in order to optimize the LOS performance of the optical module, the application also provides an LOS optimization method of the optical module, which comprises the following steps:

the current optical power is not smaller than a preset optical power threshold, and the LOSA threshold of the limiting amplifier is controlled to be a first LOSA threshold;

the current optical power is smaller than a preset optical power threshold value, an LOS signal is not received, and the LOSA threshold of the limiting amplifier is controlled to be a second LOSA threshold value;

the current optical power is smaller than a preset optical power threshold, and an LOS signal is received, so that the LOSA threshold of the limiting amplifier is controlled to be a first LOSA threshold.

The optical power corresponding to the second LOSA threshold is lower than the optical power corresponding to the first LOSA threshold.

The optical module LOS optimization method provided by the application comprises the following steps: the current optical power is smaller than a preset optical power threshold value, an LOS signal is not received, and the MCU controls the LOSA threshold of the limiting amplifier to be a second LOSA threshold value; the current optical power is not smaller than a preset optical power threshold, or the current optical power is smaller than the preset optical power threshold and LOS signals are received, and the MCU controls the LOSA threshold of the limiting amplifier to be a second LOSA threshold; wherein the optical power corresponding to the second LOSA threshold is lower than the optical power corresponding to the first LOSA threshold. The MCU monitors the received optical power through the power signal, and when the optical power is smaller than a preset optical power threshold value and the limiting amplifier is confirmed not to report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by a preset value, so that the optical power value corresponding to the value of the LOSA is reduced. After the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold of the limiting amplifier to a normal value by A, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance of the optical module is optimized.

Further, in some embodiments of the present application, the optical module LOS optimization method is applicable to an optical receiving sub-module, and to implement the above method, the optical receiving sub-module includes: the light detector receives the optical signal and converts the optical signal into an electrical signal. And the first end of the APD boosting circuit is connected with the optical detector to provide reverse working voltage for the optical detector. The second end of the APD voltage boosting circuit is connected with the first end of the MCU and used for outputting a power signal to the MCU and monitoring optical power. The optical detector is also connected with a limiting amplifier for amplifying the optical signal output by the optical detector and outputting the amplified electric signal to the upper computer. The limiting amplifier is also connected with the MCU. The fourth end of the MCU is connected with a limiting amplifier and receives an LOS signal. The first end of the limiting amplifier is connected with the output end of the optical detector and is used for receiving the electric signal of the optical detector and amplifying the electric signal. The second end of the limiting amplifier is connected with the fourth end of the MCU and is used for sending LOS signals to the MCU. And the third end of the limiting amplifier is connected with the third end of the MCU and is used for receiving the control signal of the MCU. The MCU receives the LOS signal and sends a control signal according to the LOS signal, and the control signal is used for adjusting the LOS threshold value set in the limiting amplifier.

The MCU is configured to: receiving a power signal of the optical detector, wherein the power signal of the current optical power is smaller than a preset optical power threshold value, an LOS signal is not received, and the LOSA threshold of the limiting amplifier is a second LOSA threshold value;

the current optical power is not smaller than a preset optical power threshold, or the current optical power is smaller than the preset optical power threshold and LOS signals are received, and the LOSA threshold of the limiting amplifier is a first LOSA threshold; wherein the second LOSA threshold is less than the first LOSA threshold.

In order to increase the light power detection range of the light detector, in the embodiment provided by the application, the MCU can judge whether the power signal of the current light power is smaller than the preset light power threshold according to the comparison of the received power signal and the preset current threshold. If the power signal is smaller than the preset current threshold, judging that the power signal of the current optical power is smaller than the preset optical power threshold. A current threshold is preset in the register. The MCU adjusts a control signal output to the limiting amplifier according to the power signal to control the LOSA threshold of the limiting amplifier.

And when the power signal received by the MCU is lower than the current threshold value, controlling the LOSA threshold of the limiting amplifier to be reduced by a certain preset value.

The preset current threshold may be set according to a comparison of the power signal and the optical power. The optical power corresponding to the current threshold is typically greater than the optical power value corresponding to the LOSA at the first output voltage.

Further, the MCU is configured to: the power signal is less than the current threshold and no LOS signal is received, the LOSA threshold of the limiting amplifier is controlled to decrease. The LOSA threshold of the limiting amplifier is reduced, the minimum value of the detection light power of the light detector is smaller than that before the LOSA threshold is changed, and the LOS function optimization of the light receiving sub-module is realized.

And setting a LOSA threshold in the limiting amplifier, and judging whether an LOS signal is output or not. In an embodiment of the present application, the limiting amplifier outputs the LOS signal when the output voltage of the photodetector is less than the LOSA threshold. The LOS threshold comprises an LOSA threshold and an LOSD threshold, and when the output voltage of the optical detector is smaller than the LOSA threshold, the limiting amplifier outputs an LOS signal; when the output voltage of the photodetector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

In this embodiment, the MCU monitors the received optical power through the power signal, and when the optical power is less than a fixed value and it is confirmed that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by a preset value, so that the optical power value corresponding to the value of the LOSA is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the value of the LOSH is increased.

The scheme optimizes the software level on the basis of the existing and conventional hardware scheme without increasing any cost, but can effectively solve the problem of too small LOSH, and can flexibly configure a current threshold value and a proper value of a preset value or an LOSA threshold value through the MCU according to own needs to optimize the LOS performance of the optical module.

In some embodiments of the present application, an optical power threshold and a table for comparing the power signal with the optical power may be preset in the register, and the MCU converts the received current power signal into the current optical power according to the table for comparing the power signal with the optical power. The MCU is configured to: and if the current optical power is smaller than the preset optical power threshold value and the LOS signal is not received, the LOSA threshold of the limiting amplifier is controlled to be reduced. The LOSA threshold of the limiting amplifier is reduced, the minimum value of the detection light power of the light detector is smaller than that before the change, the LOS performance of the optical module is optimized, and the LOS function optimization of the optical receiving sub-module is realized.

After the MCU receives the LOS signal, the LOSA threshold of the limiting amplifier is controlled to recover. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold and the LOS signal is not received, outputting a second control signal, and controlling the LOSA threshold of the limiting amplifier to be the second LOSA threshold; after receiving the LOS signal, the MCU outputs a first control signal, and controls the LOSA threshold of the limiting amplifier to be the first LOSA threshold. The difference between the first LOSA threshold and the second LOSA threshold of the limiting amplifier is a preset value.

In this embodiment of the present application, the MCU monitors the magnitude of the received optical power by using a power signal, which may be a current signal, and when the optical power is smaller than a fixed value and it is confirmed that the limiting amplifier does not report the LOS signal, the LOS threshold of the limiting amplifier is reduced by a preset value, so that the optical power value corresponding to the value of the LOS is reduced. When the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold of the limiting amplifier to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance of the optical module is optimized.

and acquiring LOS signals, comparing the current optical power with a preset optical power threshold value, and selecting the LOSA threshold of the limiting amplifier according to the LOS signals.

Specifically, if the current optical power is greater than or equal to the preset optical power threshold, the LOSA threshold of the limiting amplifier is a first threshold. If the current optical power is smaller than the preset optical power threshold and no LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be a second LOSA threshold. If the LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be a second LOSA threshold. Wherein the first LOSA threshold is higher than the second LOSA threshold. The MCU monitors the received optical power through the power signal, when the optical power is smaller than a preset optical power threshold value and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by a preset value, and at the moment, the optical power value corresponding to the value of the LOSA is reduced. After the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold of the limiting amplifier to a normal value, and the value of the LOSD obtained when the light is gradually increased is still as large as the initial value, so that the LOS performance of the optical module is optimized.

Fig. 8 is a schematic diagram of another light receiving sub-module according to an embodiment of the present application. As shown in the drawing, the light receiving sub-module includes: the photodetector is used for converting the optical signal into an electrical signal. The limiting amplifier is provided with an LOS signal pin for outputting high level or low level and a limiting amplifier regulating end. An APD boost circuit comprising: a control interface; the power supply interface is connected with the optical detector and is used for supplying power to the optical detector; and the output interface outputs the power signal of the optical signal. An MCU, comprising: the detection pin is connected with the output interface and receives the power signal; an input pin connected to the limiting amplifier for receiving the high level or the low level; an APD adjusting pin connected with the control interface; and the limiting and discharging adjusting pin is connected with the limiting and discharging adjusting end. The MCU is internally provided with a power signal monitoring value; when the operation judges that the power signal is smaller than the monitoring value, the input pin receives the high level, the APD adjusting pin sends a signal to the control interface, the output voltage of the power supply interface is increased, and the limiting and releasing adjusting pin sends a regulating signal to the limiting and releasing adjusting end to reduce an LOS threshold.

The specific APD adjusting pin sends a signal to the control interface to raise the output voltage of the power supply interface, and the limiting and releasing adjusting pin sends a regulating signal to the limiting and releasing adjusting end to reduce the LOS threshold adjusting process, which is consistent with the foregoing description and will not be described one by one.

The invention also provides an optical module LOS optimization method corresponding to the device, which comprises the following steps: calculating the current optical power according to the power signal;

Since the foregoing embodiments are all described in other modes by reference to the above, the same parts are provided between different embodiments, and the same and similar parts are provided between the embodiments in the present specification. And will not be described in detail herein.

It should be noted that in this specification, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the statement "comprises" or "comprising" a … … "does not exclude that an additional identical element is present in a circuit structure, article or apparatus that comprises the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application are not intended to limit the scope of the present application.

Claims

1. An optical module, comprising:

a photodetector for converting the optical signal into an electrical signal;

an APD boost circuit comprising:

a control interface;

an output interface outputting a power signal of the optical signal;

an MCU, comprising:

An APD adjusting pin connected with the control interface;

the MCU is internally provided with a power signal monitoring value; when the operation judges that the power signal is smaller than the monitoring value and the input pin receives the low level, the APD regulating pin sends out a signal to the control interface so as to increase the output voltage of the power supply interface, and the limiting and discharging regulating pin sends out a regulating signal to the limiting and discharging regulating end so as to reduce an LOS threshold;

when the operation judges that the power signal is smaller than the monitoring value and the input pin receives the high level, the regulating pin sends out a signal to the control interface so that before the output voltage of the power supply interface is recovered to be not boosted, the limiting-amplification regulating pin sends out a regulating signal to the limiting-amplification regulating end so that the LOS threshold is recovered to be not reduced;

the APD voltage boosting circuit further comprises a current mirror circuit so as to monitor photocurrent detected by the photodetector, and a power signal is formed and transmitted to the MCU.

2. The optical module of claim 1, wherein an LOS threshold is provided in the limiting amplifier; and outputting the high level when the operation judges that the electric signal is smaller than the LOS threshold.

3. The optical module of claim 1, wherein the limiting amplifier is provided with an amplifying output terminal for outputting the amplified electric signal.

4. A method of optical module LOS optimization, applied to an optical module as claimed in any one of claims 1-3, comprising:

calculating the current optical power according to the power signal;

the current optical power is not smaller than a preset optical power threshold, the LOS threshold of the limiting amplifier is controlled to be a first LOSA threshold, and the output voltage of the APD boosting circuit is controlled to be a first output voltage;

the current optical power is smaller than the preset optical power threshold value, LOS signals are not received, the LOS threshold of the limiting amplifier is controlled to be a second LOSA threshold value, and the output voltage of the APD booster circuit is controlled to be a second output voltage;

the current optical power is smaller than a preset optical power threshold, the LOS signal is received, the LOS threshold of the limiting amplifier is controlled to be a first LOSA threshold, and the output voltage of the APD booster circuit is controlled to be the first output voltage;

5. The method of optical module LOS optimization as recited in claim 4, further comprising: and selecting whether to send the LOS signal or not by the limiting amplifier according to the LOS threshold and the current optical power.

6. The method of claim 5, wherein the output voltage of the APD boost circuit is used for the operating voltage of the photodetector.