CN114142939A

CN114142939A - Optical module and optical module LOS optimization method

Info

Publication number: CN114142939A
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: 2022-03-04
Anticipated expiration: 2041-12-03
Also published as: CN114142939B

Abstract

The application discloses an optical module and an optical module LOS optimization method, which comprises the following steps: and the optical detector 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 the output interface outputs a power signal of the optical signal. An MCU, comprising: the detection pin is connected with the output interface and receives the power signal; the input pin is connected with the limiting amplifier and used for receiving high level or low level; the adjusting pin is connected with the control interface, and a power signal monitoring value is arranged in the MCU; when the power signal is judged to be smaller than the monitoring value through operation, and the input pin receives a high level, the adjusting pin sends a signal to the control interface to increase the output voltage of the power supply interface, or the limited-amplification adjusting pin sends a regulation signal to the limited-amplification adjusting 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 services and application modes such as cloud computing, mobile internet, video and the like, the development and progress of the optical communication technology become increasingly important. In the optical communication technology, an optical module is a tool for realizing the interconversion of optical signals and is one of the key devices in optical communication equipment.

In the application, the speed of one type of optical module is not high, but the transmission distance is required to be long. The indexes of sensitivity, LOSD, LOSA, LOSH, and the like of the light receiving end approach the limit because of long-distance transmission. When the received optical power is very small, the amplitude of an electrical signal generated by converting an optical signal by the optical detector is small, a certain reject ratio exists, and the cost loss of the optical module is caused.

Disclosure of Invention

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

In order to solve the technical problem, 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 a high level or a low level and an amplifying limiting regulation and control end;

an APD boost circuit, comprising:

a control interface;

the power supply interface is connected with the optical detector and supplies power to the optical detector;

an output interface for 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 with the limiting amplifier and used for receiving the high level or the low level;

the APD adjusting pin is connected with the control interface;

the limited-release adjusting pin is connected with the limited-release adjusting end;

a power signal monitoring value is arranged in the MCU; when the power signal is judged to be smaller than the monitoring value through operation 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 limited-amplification adjusting pin sends a regulation signal to the limited-amplification adjusting end to reduce the LOS threshold.

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

the application discloses optical module includes: and the optical detector 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 supplies 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 with the limiting amplifier and used 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 power signal is judged to be smaller than the monitoring value through operation and the input pin receives the high level, the adjusting pin sends a signal to the control interface, the output voltage of the power supply interface is increased, or the limited-amplification adjusting pin sends an adjusting signal to the limited-amplification adjusting end to reduce the LOS threshold. In the application, 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 the limiting amplifier is confirmed not to report an 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 LOSA value is reduced by a little. After the limiting amplifier reports the LOS signal, the MCU returns the LOS threshold of the limiting amplifier to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOSH value is enlarged. And the suitable values of the current threshold value and the LOS threshold reduction value are flexibly configured through the MCU, 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 less than a preset optical power threshold, 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;

when the current optical power is smaller than the preset optical power threshold value and no LOS signal is received, controlling the LOS threshold of the limiting amplifier to be a second LOSA threshold value or controlling the output voltage of the APD booster circuit to be a second output voltage;

when the current optical power is smaller than a preset optical power threshold value and the LOS signal is received, controlling the LOS threshold of the limiting amplifier to be a first LOSA threshold value or controlling the output voltage of the APD booster circuit 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 a LOS optimization method, which comprises the following steps: calculating the current optical power according to the power signal; the current optical power is not less than a preset optical power threshold, 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; when the current optical power is smaller than the preset optical power threshold value and no LOS signal is received, controlling the LOS threshold of the limiting amplifier to be a second LOSA threshold value or controlling the output voltage of the APD booster circuit to be a second output voltage; when the current optical power is smaller than a preset optical power threshold value and the LOS signal is received, controlling the LOS threshold of the limiting amplifier to be a first LOSA threshold value or controlling the output voltage of the APD booster circuit 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 the embodiment of the application, the magnitude of the received optical power is monitored through the power signal, when the optical power is smaller than the preset optical power threshold value and the limit amplifier is determined not to report the LOS signal, the LOS threshold of the limit 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 by a little. After the limiting amplifier reports the LOS signal, the MCU returns the LOS threshold of the limiting amplifier to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOSH value is enlarged. And the LOS performance of the optical module is optimized by flexibly configuring appropriate values of the current threshold value and the LOS threshold reduction value.

Drawings

In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed 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 can be obtained by those skilled in the art according to the drawings. Furthermore, the drawings in the following description may be regarded as schematic diagrams, and do not limit the actual size of products, the actual flow of methods, the actual timing of signals, and the like, involved in 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 a light 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 disclosure;

fig. 6 is a schematic diagram of a rosa according to an embodiment of the present disclosure;

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

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

Detailed Description

Technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided by the present disclosure belong to the protection scope of the present disclosure.

Unless the context requires otherwise, throughout the description and the claims, the term "comprise" and its other forms, such as the third person's singular form "comprising" and the present participle form "comprising" are to be interpreted in an open, inclusive sense, i.e. as "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "example", "specific example" or "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 are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present disclosure, "a plurality" means two or more unless otherwise specified.

In describing some embodiments, expressions of "coupled" and "connected," along with 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, some embodiments may be described using the term "coupled" to indicate that two or more elements are in direct physical or electrical contact. However, the terms "coupled" or "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 contents herein.

"at least one of A, B and C" has the same meaning as "A, B or at least one of C," each including the following combination of A, B and C: a alone, B alone, C alone, a and B in combination, a and C in combination, B and C in combination, and A, B and C in combination.

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

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

As used herein, "about," "approximately," or "approximately" includes the stated values as well as average values that are within an acceptable range of deviation for the particular value, as determined by one of ordinary skill in the art in view of the measurement in question and the error associated with measurement of the particular quantity (i.e., the 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 information processing equipment such as a computer through information transmission equipment such as an optical fiber or an optical waveguide, so as to complete information transmission. Because the optical signal has the passive transmission characteristic when being transmitted through the optical fiber or the optical waveguide, the information transmission with low cost and low loss 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 interconversion 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 electrical signal in the technical field of optical fiber communication. The optical module comprises an optical port and an electrical port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides and the like through the optical port, realizes electrical connection with an optical network terminal (such as an optical modem) through the electrical port, and the electrical connection 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 the computer and other information processing equipment through a network cable or a 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, for example, signal transmission of several kilometers (6 kilometers to 8 kilometers), on the basis of which if a repeater is used, ultra-long-distance transmission can be theoretically achieved. Therefore, in a typical optical communication system, the distance between the remote server 1000 and the optical network terminal 100 may be 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 apparatuses: router, switch, computer, cell-phone, panel computer, TV set 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 the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is completed 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, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100, so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. The optical module 200 converts an optical signal and an electrical signal to each other, 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 housing (housing) having a substantially rectangular parallelepiped shape, 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 establishes a bidirectional electrical signal connection with the optical module 200; 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. The optical module 200 is connected to the network cable 103 via the optical network terminal 100. For example, 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, so that the optical network terminal 100 can monitor the operation of the optical module 200 as an upper computer of the optical module 200. The upper computer of the Optical module 200 may include an Optical Line Terminal (OLT) and 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 structural diagram of an optical network terminal according to some embodiments, and fig. 2 only shows a structure of the optical module 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 projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into a cage 106 of the optical network terminal 100, the cage 106 holds the optical module 200, and heat generated by the optical module 200 is conducted to the cage 106 and then diffused by a heat sink 107. After the optical module 200 is inserted into the cage 106, an electrical port of the optical module 200 is connected to an electrical connector inside the cage 106, and thus the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. Further, the optical port of the optical module 200 is connected to the optical fiber 101, and the optical module 200 establishes bidirectional electrical signal connection with the optical fiber 101.

Fig. 3 is a block diagram of a light module according to some embodiments, and fig. 4 is an exploded view of a light 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 shell comprises an upper shell 201 and a lower shell 202, wherein the upper shell 201 is covered on the lower shell 202 to form the shell with two

openings

204 and 205; the outer contour of the housing generally appears square.

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

The direction of the connecting line of the two

openings

204 and 205 may be the same as the length direction of the optical module 200, or may not be the same as the length direction of the optical module 200. For example, the opening 204 is located at an end (left end in fig. 3) of the optical module 200, and the opening 205 is also located at an end (right end in fig. 3) of the optical module 200. Alternatively, the opening 204 is located at an end of the optical module 200, and the opening 205 is located at a side of the optical module 200. Wherein, the opening 204 is an electrical port, and the gold 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 receive the external optical fiber 101, so that the optical fiber 101 is connected to the optical transceiver 400 inside the optical module 200.

The upper shell 201 and the lower shell 202 are combined in an assembly mode, so that devices such as the circuit board 300 and the optical transceiver can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 can form packaging protection for the devices. In addition, when the devices such as the circuit board 300 are assembled, the positioning components, the heat dissipation components and the electromagnetic shielding components of the devices are convenient to arrange, and the automatic implementation production is facilitated.

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

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

Illustratively, the unlocking member 203 is located on the outer wall of the two lower side plates 2022 of the lower housing 202, and includes a snap-fit 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 engaging member of the unlocking member 203; when the unlocking member 203 is pulled, the engaging member of the unlocking member 203 moves along with the unlocking member, and the connection relationship between the engaging member and the upper computer is changed, so that the engagement relationship between the optical module 200 and the upper computer is released, and the optical module 200 can be drawn out from the cage of the upper computer.

The circuit board 300 includes circuit traces, electronic components, and chips, and the electronic components and the chips are connected together by the circuit traces according to a circuit design to implement functions of power supply, electrical signal transmission, grounding, and the like. The electronic components may include, for example, capacitors, resistors, transistors, Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs). The chip may include, for example, a Micro Controller Unit (MCU), a limiting amplifier (limiting amplifier), a Clock and Data Recovery (CDR) chip, a power management chip, and a Digital Signal Processing (DSP) chip.

The circuit board 300 is generally a rigid circuit board, which can also perform a bearing function due to its relatively rigid material, for example, the rigid circuit board can stably bear a chip; the rigid circuit board can also be inserted into an electric connector in the cage of the upper computer.

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 electrically connected to the electrical connector in the cage 106 by the gold fingers 301. The gold finger 301 may be disposed on only one side surface (e.g., 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 requirement of the number of pins is large. The golden finger 301 is configured to establish an electrical connection with the upper computer to achieve power supply, ground, I2C signaling, data signaling, and the like. Of course, a flexible circuit board is also used in some optical modules. Flexible circuit boards are commonly used in conjunction with rigid circuit boards to supplement the rigid circuit boards.

The optical transceiver comprises an optical transmitter subassembly and an optical receiver subassembly.

The optical module for long-distance transmission has high requirement on the sensitivity index of the optical receive sub-module, so that the optical receive sub-module needs to work in a very small receiving optical power range, meanwhile, the LOS threshold needs to be set very small, and certain delay of LOSD and LOSA must be ensured. The method and the device for optimizing the LOS index of the optical receive sub-module are provided.

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 MCU 301. In this embodiment, the MCU301 is connected to the optical detector and the limiting amplifier, and is configured to monitor the optical power of the optical detector and the LOS signal of the limiting amplifier, and adjust the operating voltage of the optical detector.

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

And the limiting amplifier is provided with an LOS signal pin and is used for outputting high level or low level. And the limiting amplifier is provided with a signal input end, 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 the embodiment of the present application, the LOS signal pin of the limiting amplifier outputs a high level, which is an LOS signal.

In order to increase the detection optical power range of the optical detector, in the embodiment provided by the present application, the MCU has a built-in register, and the register monitors the value. And the MCU adjusts the control signal output to the APD booster circuit according to the power signal and controls the output voltage of the APD booster circuit.

Specifically, the first end of the APD boost circuit is connected to an APD pin of the photodetector, and is configured to provide a high voltage for the APD photodiode to operate in the reverse direction.

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 the MCU is a detection pin, the second end is an adjustment pin, the third end is an input pin, and the fourth end is a limiting amplifier adjustment pin. The first end of the limiting amplifier is a signal input end, the second end of the limiting amplifier is an LOS signal pin, the third end of the limiting amplifier is a limiting amplifier regulation and control end, and the fourth end of the limiting amplifier is an amplification output end.

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

And the second end of the MCU is connected with the third end of the APD booster circuit, outputs a control signal to the APD booster circuit and controls the output voltage of the APD booster circuit. And when the power signal received by the MCU is lower than the monitoring value, controlling the output voltage of the APD booster circuit to increase by a certain preset voltage fixed 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 the 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 photodetector 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, controlling the output voltage of the APD booster circuit to increase. The output voltage of the APD booster circuit is increased, the minimum value of the detection optical power of the optical detector is smaller than that before boosting, the LOS performance is optimized, and the LOS function optimization of the optical receive sub-module is realized.

If the output voltage of the APD booster circuit keeps an increased state for a long time and the damage to the optical detector is large, after the MCU receives the LOS signal, the output voltage of the APD booster circuit is controlled to recover the original output. 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 and controlling the output voltage of the APD booster circuit to be a second output voltage; and 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 value between the first output voltage and the second output voltage of the APD booster circuit is the preset voltage fixed value.

And an LOS threshold is set in the limiting amplifier to judge whether an LOS signal is output or not. In the embodiment of the application, when the output voltage of the optical detector is less than the LOS threshold, the limiting amplifier outputs an LOS signal.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and when the optical power is smaller than the preset optical power threshold and it is determined that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage setting, so that the optical power value corresponding to the LOSA value is reduced by a small amount (compared with the case where the preset voltage setting is not increased). After the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value (i.e., the preset voltage fixed value is not increased), and the obtained LOSD value is still as large as the original value when the light is gradually increased from low light, so that the LOSH value is increased.

The scheme carries out software-level optimization on the basis of the existing and conventional hardware schemes, does not increase any cost, can effectively solve the problem of over-small LOSH, and can flexibly configure appropriate values of a monitoring value and a preset voltage set value through the MCU according to the needs of the MCU to optimize LOS performance.

In the application, the light power received by the light detector is gradually attenuated to small light, when the LOS signal voltage is changed from low level to high level, the LOS signal is obtained, and the corresponding light power is LOSA; the optical power received by the optical detector gradually increases to high light, 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 LOSD minus the LOSA is LOSH.

In some embodiments of the present application, the register may be preset with an optical power threshold and a comparison table of the power signal and the optical power, and the MCU converts the magnitude of the received current power signal into the current optical power according to the comparison table of the power signal and the optical power. The MCU is configured to: and when 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 booster circuit to increase. The output voltage of the APD booster circuit is increased, the minimum value of the detection optical power of the optical detector is smaller than that before boosting, the LOS performance is optimized, and the LOS function optimization of the optical receive sub-module is realized.

In the embodiment of the present application, the register may be disposed inside the MCU or outside the MCU, which is not limited to this.

And after receiving the LOS signal, the MCU controls the output voltage of the APD booster circuit to recover the original output. 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 to control the output voltage of the APD boost circuit to be a second output voltage; and 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 value between the first output voltage and the second output voltage of the APD booster circuit is the preset voltage fixed value.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and when the optical power is smaller than the preset optical power threshold and it is determined that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage fixed 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 voltage output by the APD to a normal value, and the LOSD value obtained when the light gradually increases is still as large as the initial value, so that the LOS index of the optical module is optimized.

Corresponding to the above device, the present application also provides an LOS optimization method for an optical module, including:

controlling the output voltage of the APD booster circuit to be a first output voltage when the current optical power is not less than a preset optical power threshold value;

when the current optical power is smaller than a preset optical power threshold value and no LOS signal is received, controlling the output voltage of the APD booster circuit to be a second output voltage;

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

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

The LOS optimization method for the optical module comprises the following steps: when the current optical power is smaller than a 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 a second output voltage; the current optical power is not less than a preset optical power threshold value, or the current optical power is less than the preset optical power threshold value and receives an LOS signal, and the MCU controls the output voltage of the APD booster circuit to be a first output voltage; wherein the second output voltage is higher than the first output voltage. 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 LOS signal is not reported by the limiting amplifier, the high voltage output by the APD booster circuit is increased by a preset voltage fixed value, at the moment, the high voltage output by the APD booster circuit is a second output voltage, and the optical power value corresponding to the LOSA value is reduced. After the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOS performance is optimized.

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

The MCU is configured to: receiving a power signal of the optical detector, wherein the current power signal of the optical power is smaller than a preset optical power threshold value and the 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, or the current optical power is smaller than the preset optical power threshold and receives an LOS signal, and the output voltage of the APD booster 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 the LOS performance and increase the detection optical power range of the optical detector, in the embodiment provided by the application, the MCU may determine whether the power signal of the current optical power is smaller than the preset optical power threshold according to the comparison between the received power signal and the monitored value. And 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. And the MCU adjusts the control signal output to the APD booster circuit according to the power signal and controls the output voltage of the APD booster circuit.

And the second end of the MCU is connected with the third end of the APD booster circuit, outputs a control signal to the APD booster circuit and controls the output voltage of the APD booster circuit. And when the power signal received by the MCU is lower than the monitoring value, controlling the output voltage of the APD booster circuit to increase by a certain preset voltage fixed value. According to the working principle of the optical detector, the output voltage of the APD booster circuit is increased, and the amplitude of the output 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 monitored value generally corresponds to an optical power value that is greater than an optical power value corresponding to the LOSA at the first output voltage.

If the output voltage of the APD booster circuit keeps an increasing state for a long time, after the MCU receives the LOS signal, the output voltage of the APD booster circuit is controlled to recover the original output. 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 and controlling the output voltage of the APD booster circuit to be a second output voltage; and 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 value between the first output voltage and the second output voltage of the APD booster circuit is the preset voltage fixed value.

And an LOS threshold is set in the limiting amplifier to judge whether an LOS signal is output or not. In the embodiment of the application, when the output voltage of the optical detector is less 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 optical detector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and when the optical power is smaller than a fixed value and it is determined that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage fixed value, so that the optical power value corresponding to the LOSA value is reduced by a small amount (compared with the case where the preset voltage fixed value is not increased). After the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value (i.e., the preset voltage fixed value is not increased), and the obtained LOSD value is still as large as the original value when the light is gradually increased from low light, so that the LOSH value is increased.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and increases the high voltage output by the APD booster circuit by a predetermined voltage value when the optical power is smaller than a predetermined value and it is determined that the limiting amplifier does not report the LOS signal, so that the optical power value corresponding to the LOSA value is reduced. After the amplitude limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOS performance is optimized.

The LOS optimization method for the optical module comprises the following steps:

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

and acquiring an LOS signal, and selecting an output voltage value of the APD booster circuit according to a comparison result between the current optical power and a preset optical power threshold value and the LOS signal.

Specifically, if the current optical power is greater than or equal to the preset optical power threshold, the APD boost circuit outputs a first output voltage. And 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 a second output voltage. If an LOS signal is received, the MCU controls the output voltage of the APD booster circuit to be a first output voltage. Wherein the second output voltage is higher than the first output voltage. 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 LOS signal is not reported by the limiting amplifier, the high voltage output by the APD booster circuit is increased by a preset voltage fixed value, at the moment, the high voltage output by the APD booster circuit is a second output voltage, and the optical power value corresponding to the LOSA value is reduced. After the amplitude limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOS performance is optimized.

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

And 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. And the second end of the limiting amplifier is connected with the fourth end of the MCU and used for sending an LOS signal to the MCU. And the third end of the limiting amplifier is connected with the third end of the MCU and 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 an LOS threshold value arranged in the limiting amplifier. In order to increase the detection optical power range of the optical detector, in the embodiment provided by the present application, the MCU has a built-in register, and an optical power threshold is preset in the register. The MCU adjusts the control signal output to the limiting amplifier according to the power signal, and adjusts the size of the LOS threshold.

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

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

And when the power signal received by the MCU is lower than the current threshold, controlling and adjusting the LOS threshold 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 trigger 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. The current threshold value generally corresponds to an optical power greater than the minimum optical power that can be detected by the photodetector.

And an LOS threshold is set in the limiting amplifier to judge whether an LOS signal is output or not. 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 optical detector 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 the LOS signal is not received, then the LOS threshold of the limiting amplifier is controlled to decrease. The LOSA threshold is reduced, the optical power corresponding to the LOS signal is triggered to be smaller than that before the LOSA threshold is changed, and the LOS function optimization of the optical receive sub-module is realized.

And after receiving the LOS signal, the MCU controls 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 does not receive the LOS signal, a second control signal is output, and the LOSA threshold is controlled 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 value. The first LOSA threshold of the limiting amplifier is greater than the second LOSA threshold.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and when the optical power is smaller than the preset optical power threshold and it is determined that the limiting amplifier does not report the LOS signal, the threshold of the LOS a of the limiting amplifier is reduced, so that the optical power value corresponding to the value of the LOS a is reduced. After the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold value of the limiting amplifier to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOSH value is enlarged.

The scheme optimizes the software level on the basis of the existing and conventional hardware scheme, does not increase any cost, can effectively solve the problem of over-small LOSH, and can flexibly configure suitable values of the current threshold and the LOSA threshold through the MCU according to the needs of the MCU to optimize the LOS performance of the optical module.

In some embodiments of the present application, the register may be preset with an optical power threshold and a comparison table of the power signal and the optical power, and the MCU converts the magnitude of the received current power signal into the current optical power according to the comparison table of the power signal and 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 LOSA threshold of the limiting amplifier to be reduced. The LOSA threshold of the limiting amplifier is reduced, the minimum value of the detection optical power of the optical detector is reduced before change, and the LOS function optimization of the optical receive sub-module is realized.

And after receiving the LOS signal, the MCU controls the LOSA threshold of the limiting amplifier to recover 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 no LOS signal is received, a second control signal is output, and the LOSA threshold of the limiting amplifier is controlled 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 a first LOSA threshold value. The optical power corresponding to the second LOSA threshold of the limiting amplifier is smaller than the optical power corresponding to the second LOSA threshold.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and when the optical power is smaller than the preset optical power threshold and it is determined that the limiting amplifier does not report the LOS signal, the LOS threshold of the limiting amplifier is decreased by the preset value, so that the optical power value corresponding to the value of the LOS is decreased. After the amplitude limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original 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 less than a preset optical power threshold, and the LOSA threshold of the limiting amplifier is controlled to be a first LOSA threshold;

when the current optical power is smaller than a preset optical power threshold value and no LOS signal is received, controlling the LOSA threshold of the limiting amplifier to be a second LOSA threshold value;

and when the current optical power is smaller than the preset optical power threshold and an LOSA signal is received, controlling the LOSA threshold of the limiting amplifier 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 LOS optimization method for the optical module comprises the following steps: the current optical power is smaller than a preset optical power threshold value, and an LOSA (line of sight) 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 less than a preset optical power threshold, or the current optical power is less than the preset optical power threshold and receives an LOS signal, and the MCU controls the LOSA threshold of the limiting amplifier to be a second LOSA threshold; and 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 magnitude of 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 LOSA value 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 the A, and the LOSD value 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 LOS optimization method for the optical module is applicable to the rosa, and to implement the method, the rosa includes: and the optical detector receives the optical signal and converts the optical signal into an electric signal. And the first end of the APD booster circuit is connected with the optical detector and provides reverse working voltage for the optical detector. And the second end of the APD booster circuit is connected with the first end of the MCU and is used for outputting a power signal to the MCU and monitoring the optical power. The optical detector is also connected with a limiting amplifier and is used for amplifying the optical signal output by the optical detector and outputting the amplified electric signal to an upper computer. The limiting amplifier is also connected with the MCU. And the fourth end of the MCU is connected with the limiting amplifier and receives the LOS signal. And 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. And the second end of the limiting amplifier is connected with the fourth end of the MCU and used for sending an LOS signal to the MCU. And the third end of the limiting amplifier is connected with the third end of the MCU and 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 an LOS threshold value arranged 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, and an LOSA (line of sight) 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 receives an LOS signal, 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 detection optical power range of the optical detector, in the embodiment provided by the application, the MCU may determine whether the power signal of the current optical power is smaller than the preset optical power threshold according to the comparison between the received power signal and the preset current threshold. And 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. The current threshold is preset in the register. The MCU adjusts the control signal output to the limiting amplifier according to the power signal, and controls the LOSA threshold of the limiting amplifier.

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

The preset current threshold value can be set according to the comparison condition of the power signal and the optical power. The optical power corresponding to the current threshold is typically greater than the optical power 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 the LOS signal is not 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 optical power of the optical detector is reduced before the change of the LOSA threshold, and the LOS function optimization of the optical receive sub-module is realized.

And an LOSA threshold is set in the limiting amplifier to judge whether an LOS signal is output or not. In the 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 optical detector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

In the embodiment of the application, the MCU monitors the received optical power through the power signal, and when the optical power is smaller than a fixed value and it is determined that the limiting amplifier does not report the LOS signal, the LOS threshold of the limiting amplifier is decreased by the predetermined value, so that the optical power value corresponding to the LOS value is decreased. After the amplitude limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to a normal value, and the LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOSH value is enlarged.

The scheme optimizes the software level on the basis of the existing and conventional hardware scheme, does not increase any cost, can effectively solve the problem of over-small LOSH, and can flexibly configure the current threshold value and the preset value or the appropriate value of the LOSA threshold value through the MCU according to the needs of the MCU to optimize the LOS performance of the optical module.

In some embodiments of the present application, the register may be preset with an optical power threshold and a comparison table of the power signal and the optical power, and the MCU converts the magnitude of the received current power signal into the current optical power according to the comparison table of the power signal and 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 LOSA threshold of the limiting amplifier to be reduced. The LOSA threshold of the limiting amplifier is reduced, the minimum value of the detection optical power of the optical detector is reduced before change, the LOS performance of the optical module is optimized, and the LOS function of the optical receive sub-module is optimized.

And after the MCU receives the LOS signal, the LOSA threshold recovery of the limiting amplifier is controlled. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold and no LOS signal is received, a second control signal is output, and the LOSA threshold of the limiting amplifier is controlled 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 a first LOSA threshold value. The difference between the first and second LOSA threshold values of the limiting amplifier is the preset value.

In the embodiment of the application, the MCU monitors the received optical power through a power signal, which may be a current signal, and when the optical power is smaller than a fixed value and it is determined that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by a predetermined value, so that the optical power value corresponding to the LOSA value 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 LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOS performance of the optical module is optimized.

and acquiring an LOS signal, and selecting an LOSA threshold of the limiting amplifier according to a comparison result between the current optical power and a preset optical power threshold and the LOS signal.

Specifically, if the current optical power is greater than or equal to the preset optical power threshold, the limiting amplifier LOSA threshold is the first threshold. And 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 LOSA threshold of the limiting amplifier to be a second LOSA threshold value. If an LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be a second LOSA threshold value. Wherein the first LOSA threshold is higher than the second LOSA threshold. The MCU monitors the magnitude of 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, and at the moment, the optical power value corresponding to the LOSA value 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 LOSD value obtained when the light is gradually increased is still as large as the original value, so that the LOS performance of the optical module is optimized.

Fig. 8 is a schematic diagram of another optical receive sub-module according to an embodiment of the present application. As shown in the drawing, the optical receive sub-module includes: and the optical detector 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 an amplifying limiting regulation and control end. An APD boost circuit, comprising: a control interface; the power supply interface is connected with the optical detector and supplies 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 with the limiting amplifier and used for receiving the high level or the low level; the APD adjusting pin is connected with the control interface; and the limited amplifier adjusting pin is connected with the limited amplifier adjusting end. A power signal monitoring value is arranged in the MCU; when the power signal is judged to be smaller than the monitoring value through operation 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, and the limited-amplification adjusting pin sends a regulation signal to the limited-amplification adjusting end to reduce the LOS threshold.

Specifically, the APD adjusting pin sends a signal to the control interface to increase the output voltage of the power supply interface, and the amplification-limiting adjusting pin sends a regulation signal to the amplification-limiting adjusting end to reduce the LOS threshold adjusting process, which is consistent with the above description and is not described one by one.

The LOS optimization method of the optical module is also provided corresponding to the device, and comprises the following steps: calculating the current optical power according to the power signal;

Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.

It is 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. Also, 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 presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising 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 present disclosure. This application is intended to cover any variations, uses, or adaptations of the invention 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 invention 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 do not limit the scope of the present application.

Claims

1. A light module, comprising:

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

an APD boost circuit, comprising:

a control interface;

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

an MCU, comprising:

the APD adjusting pin is connected with the control interface;

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

3. The optical module of claim 1, wherein the limiting amplifier is provided with an amplified output to output an amplified electrical signal.

4. A light module, comprising: a photodetector for converting the optical signal into an electrical signal;

an APD boost circuit, comprising:

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

an MCU, comprising:

a power signal monitoring value is arranged in the MCU; and when the power signal is judged to be smaller than the monitoring value through operation and the input pin receives the high level, the limited amplifier adjusting pin sends an adjusting signal to the limited amplifier adjusting end to reduce the LOS threshold.

5. The optical module of claim 4 wherein the limiting amplifier has an LOS threshold therein; when the operation judges that the electric signal is smaller than the LOS threshold, outputting the high level; the limiting amplifier is also provided with an amplifying output end for outputting the amplified electric signal.

6. An LOS optimization method for an optical module is characterized by comprising the following steps:

calculating the current optical power according to the power signal;

7. The optical module LOS optimization method of claim 6, further comprising: and the limiting amplifier selects whether to send an LOS signal or not according to the LOS threshold and the current optical power.

8. The optical module LOS optimization method of claim 7, wherein an output voltage of the APD boost circuit is used for an operating voltage of the optical detector.

9. An LOS optimization method for an optical module is characterized by comprising the following steps:

calculating the current optical power according to the power signal;

the current optical power is not less 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 booster circuit is controlled to be a first output voltage;

the current optical power is smaller than the preset optical power threshold value, and an LOS signal is 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;

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