CN218897220U

CN218897220U - Optical module

Info

Publication number: CN218897220U
Application number: CN202223483109.4U
Authority: CN
Inventors: 朱奇奇; 孙金星; 晁汾涛; 邓福
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-04-21
Anticipated expiration: 2032-12-26

Abstract

The application provides an optical module, which comprises a circuit board, an optical receiving chip electrically connected with the circuit board, a sampling circuit and an MCU, wherein the sampling circuit and the MCU are arranged on the circuit board, and the optical receiving chip is used for converting signal light input by an external optical fiber into a current signal; the sampling circuit is electrically connected with the light receiving chip and is used for receiving the current signal and outputting sampling voltage; the MCU is electrically connected with the sampling circuit and comprises a first register, a second register and a third register, wherein the first register is used for storing sampling voltage, the second register is used for storing the conversion relation between the sampling voltage and the received light power, and the received light power monitoring value corresponding to the sampling voltage is obtained through the conversion relation; when the received light power monitoring value is positioned at the alarm threshold value, the MCU optimizes the monitoring value to obtain a reporting value positioned in the alarm threshold value range; the third register is used for storing the report value. The method and the device report the monitoring value of the received light power after optimizing, avoid false alarm when working at the alarm threshold point, and ensure the normal working of the light module.

Description

Optical module

Technical Field

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

Background

In the cloud computing, mobile internet, video and other novel services and application modes, optical communication technology can be used, and in the optical communication, an optical module is a tool for realizing photoelectric signal mutual conversion and is one of key devices in optical communication equipment. With the rapid development of 5G networks, optical modules at the core position of optical communication have been developed.

Regardless of how the structural form of the optical module is changed and the transmission rate is increased, the main components for completing photoelectric conversion generally comprise a photoelectric detector, the optical power of signal light received by the photoelectric detector has a certain range limit, and when the incident light is near the alarm threshold value of the received optical power, the monitoring alarm of the received optical power can be triggered by mistake by the monitoring jitter of the received optical power, so that the normal operation of the optical module is affected.

Disclosure of Invention

The embodiment of the application provides an optical module, which is used for preventing false triggering of an alarm when working near an alarm threshold point of received optical power and ensuring normal working of the optical module.

The application provides an optical module, comprising:

a circuit board;

the light receiving chip is electrically connected with the circuit board and is used for converting signal light input by an external optical fiber into a current signal;

the sampling circuit is arranged on the circuit board, and the input end of the sampling circuit is electrically connected with the light receiving chip and is used for receiving the current signal and outputting sampling voltage;

the MCU is arranged on the circuit board and is electrically connected with the sampling circuit, and comprises a first register, a second register and a third register, wherein the first register is used for receiving and storing the sampling voltage, the second register is used for storing the conversion relation between the sampling voltage and the received light power, and the monitoring value of the received light power is obtained through the conversion relation when the sampling voltage is received; when the monitoring value of the received light power is positioned at the alarm threshold value of the light module, optimizing the monitoring value of the received light power to obtain a reporting value of the received light power, wherein the reporting value of the received light power is positioned in the alarm threshold value range; the third register is configured to store a reported value of the received optical power.

As can be seen from the above embodiments, the optical module provided in the embodiments of the present application includes a circuit board, an optical receiving chip, a sampling circuit and an MCU, where the optical receiving chip is electrically connected to the circuit board and is configured to convert signal light input by an external optical fiber into a current signal; the sampling circuit is arranged on the circuit board, and the input end of the sampling circuit is electrically connected with the light receiving chip and is used for receiving current signals and outputting sampling voltage; the MCU is arranged on the circuit board and is electrically connected with the sampling circuit to receive the sampling voltage; the MCU comprises a first register, a second register and a third register, wherein the first register is used for receiving and storing sampling voltage, the second register is used for storing the conversion relation between the sampling voltage and the received light power, the MCU reads the conversion relation between the sampling voltage in the first register and the second register, and the received light power monitoring value corresponding to the sampling voltage is obtained through the conversion relation between the sampling voltage and the received light power; when the received light power monitoring value is in the alarm threshold range of the light module, storing the actual monitoring value of the received light power into a third register, and waiting for an upper computer to read the received light power; when the received light power monitoring value is located at the alarm threshold of the light module, the received light power monitoring value is optimized to obtain a reported value of the received light power, the reported value of the received light power is located in the alarm threshold range of the light module, no alarm is generated, the reported value of the received light power is stored in a third register, and the upper computer waits for reading the received light power. When the received light power is located at the alarm threshold of the optical module, the monitoring value of the received light power is optimized, the optimized reported value of the received light power is stored in the third register of the MCU, the upper computer is waited to read the reported value of the received light power, and the optimized reported value of the received light power can avoid false alarm and alarm when the optical module works near the alarm threshold point, so that the normal work of the optical module can be ensured.

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 schematic diagram of an optical module according to some embodiments;

FIG. 4 is a partially exploded schematic illustration of an optical module according to some embodiments;

fig. 5 is an assembly schematic diagram of a circuit board, a light emitting assembly and a light receiving assembly in an optical module according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating a partial assembly of a circuit board and a light receiving assembly in an optical module according to an embodiment of the present application;

Fig. 7 is a schematic diagram of a partial assembly of a circuit board and a light receiving assembly in an optical module according to an embodiment of the present application;

fig. 8 is a schematic circuit diagram of an optical module according to an embodiment of the present disclosure;

fig. 9 is a circuit block diagram of an optical module according to an embodiment of the present application;

fig. 10 is a schematic diagram of a relationship between an optical power monitoring value and a reporting value in an optical module according to an embodiment of the present application;

fig. 11 is a schematic diagram two of a relationship between an optical power monitoring value and a reporting value in an optical 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.

In an optical communication system, an optical signal is used to carry information to be transmitted, and the 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 light has a passive transmission characteristic when transmitted through an optical fiber or an optical waveguide, low-cost, 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 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 the electric connection is mainly used for power supply, I2C signal transmission, data information 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 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-range signal transmission, such as several kilometers (6 kilometers to 8 kilometers), on the basis of which, if a repeater is used, it is theoretically possible to achieve unlimited 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 apparatus 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 configured to access 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 an information connection is established between the optical fiber 101 and the optical network terminal 100. Illustratively, the 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 the 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. Since the optical module 200 is a tool for implementing the mutual conversion between the optical signal and the electrical signal, it has no function of processing data, and the information is not changed during the above-mentioned photoelectric conversion process.

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. Illustratively, the optical network terminal 100 transmits an electrical signal from the optical module 200 to the network cable 103, and transmits an electrical signal from the network cable 103 to the optical module 200, so that the optical network terminal 100, as a host computer of the optical module 200, can monitor the operation 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 circuit board 105 disposed in the housing, a cage 106 disposed on a surface of the circuit board 105, a heat sink 107 disposed on the cage 106, 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 and the optical network terminal 100 propose a bi-directional electrical signal connection. 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 optical 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 (shell), a circuit board 300 disposed in the housing, and an optical component.

The housing includes an upper housing 201 and a lower housing 202, the upper housing 201 being covered on the lower housing 202 to form the above-mentioned housing having two openings; 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 that is covered on both lower side plates of the lower case 202 to form the above-described case.

In some embodiments, 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 the two upper side plates are combined with the two lower side plates to realize that the upper case 201 is covered on the lower case 202.

The direction in which the two

openings

204 and 205 are connected may be the same as the longitudinal direction of the optical module 200 or may be different from the longitudinal direction of the optical module 200. For example, opening 204 is located at the end of light module 200 (right end of fig. 3) and opening 205 is also located at the end of light module 200 (left 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, from which the golden finger of the circuit board 300 extends and is inserted into a host computer (e.g., the optical network terminal 100); the opening 205 is an optical port configured to access the external optical fiber 101 such that the external optical fiber 101 connects to an optical transceiver component inside the optical module 200.

The circuit board 300, the optical component and other devices are conveniently installed in the shell by adopting an assembly mode that the upper shell 201 and the lower shell 202 are combined, and the devices are encapsulated and protected by the upper shell 201 and the lower shell 202. In addition, when devices such as the circuit board 300 and the optical assembly are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component of the devices are convenient to deploy, and the automatic production implementation is 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 outside the housing thereof, and the unlocking member 203 is configured to achieve a fixed connection between the optical module 200 and the host computer, or to release the fixed connection between the optical module 200 and the host computer.

Illustratively, the unlocking member 203 is located on the outer walls of the two lower side plates of the lower housing 202, with a snap-in member that mates with an upper computer cage (e.g., 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 include, for example, capacitors, resistors, transistors, metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). The chips include, for example, a micro control unit (Microcontroller Unit, MCU), a laser driving chip, a limiting amplifier (limiting amplifier), a clock data recovery (Clock and Data Recovery, CDR) chip, a power management chip, a 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 the electronic components and chips; when the optical transceiver component is positioned on the circuit board, the hard circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electrical connector in the upper computer cage.

The circuit board 300 is a carrier of main electric devices of the optical module, the surface of the end part of the circuit board 300 is provided with a golden finger, the golden finger is composed of a pin which is mutually independent, the circuit board 300 is inserted into an electric connector in a cage, and the golden finger is electrically connected with an upper computer.

Fig. 5 is an assembly schematic diagram of a circuit board, a light emitting assembly and a light receiving assembly in an optical module according to an embodiment of the present application. As shown in fig. 5, the optical component may include an optical emission component 400 and an optical receiving component 500, where the optical emission component 400 and the optical receiving component 500 are staggered on the surface of the circuit board 300, so as to facilitate achieving a more electromagnetic shielding effect.

Specifically, the light emitting assembly 400 is electrically connected TO the circuit board 300, the light emitting assembly 400 may be independently packaged in a common packaging manner (such as an TO package, a COB package, etc.), and the light emitting assembly 400 may be directly disposed on the surface of the circuit board 300 or physically separated from the circuit board 300, and electrically connected TO the circuit board 300 through a flexible circuit board; the light receiving assembly 500 is electrically connected TO the circuit board 300, and the light receiving assembly 500 may be individually packaged by a common packaging method (such as TO package, COB package, etc.), and the light receiving assembly 500 may be directly placed on the surface of the circuit board 300 or physically separated from the circuit board 300, and electrically connected TO the circuit board 300 through a flexible circuit board.

Fig. 6 is a schematic diagram of a first sub-assembly of a circuit board and a light receiving assembly in an optical module according to an embodiment of the present application, and fig. 7 is a schematic diagram of a second sub-assembly of a circuit board and a light receiving assembly in an optical module according to an embodiment of the present application. As shown in fig. 6 and 7, the light receiving assembly 500 is disposed on a surface of the circuit board 300, the light receiving assembly 500 includes an optical waveguide 501, a light receiving chip 502, and a transimpedance amplifier chip (Trans-impedance amplifier, TIA) 303, and the light receiving chip 502 and the transimpedance amplifier chip 303 are disposed on the surface of the circuit board 300, respectively, to be electrically connected to the circuit board 300; the optical waveguide 501 is located above the light receiving chip 502, the photosensitive surface of the light receiving chip 502 faces the optical waveguide 501, and incident light is transmitted into the light receiving chip 502 through the optical waveguide 501.

The light receiving chip 502 is a chip for receiving an optical signal at a light module receiving end, and after the optical signal is incident on a photosensitive surface of the light receiving chip 502, the light receiving chip 502 generates a current signal by using an optoelectronic conversion effect, and in the process of converting light into current, a carrier of the signal is changed, but information is not changed. The signal output by the light receiving chip 502 is typically an analog signal, and a common light receiving chip 502 is a PIN photodiode or an avalanche photodiode APD.

The current signal generated by the light receiving chip 502 is transmitted to the transimpedance amplifying chip 303, and the current signal is amplified by the transimpedance amplifying chip 303 and then output. In addition, the transimpedance amplifier chip 303 may also integrate a conversion circuit to convert a current signal for reception into a voltage signal.

In some embodiments, the circuit board 300 is further provided with a sampling circuit 304 and an MCU302, an input end of the sampling circuit 304 is connected to an output end of the transimpedance amplifying chip 303, an output end of the sampling circuit 304 is electrically connected to the MCU302, and the MCU302 is electrically connected to the gold finger 301 through a signal trace on the circuit board 300. The sampling circuit 304 converts the signal output from the transimpedance amplification chip 303 into a signal receivable by the MCU302, and transmits the signal to the MCU302. For example, the signal output by the transimpedance amplifying chip 303 is a current signal, and the MCU302 can only receive a voltage signal, and then the sampling circuit 304 is used to convert the current signal output by the transimpedance amplifying chip 303 into a voltage signal and send the voltage signal to the MCU302. Of course, in other embodiments, the transimpedance amplifier chip 303 may also be directly electrically connected to the MCU302.

Fig. 8 is a schematic circuit diagram of an optical module according to an embodiment of the present application, and fig. 9 is a block circuit diagram of an optical module according to an embodiment of the present application. As shown in fig. 8 and 9, a sampling circuit 304 is disposed on the circuit board 300, and one end of the sampling circuit 304 is electrically connected to the transimpedance amplifying chip 303 to receive a current signal output by the transimpedance amplifying chip 303; the other end of the sampling circuit 304 is grounded, and a third end of the sampling circuit 304 is electrically connected with the MCU302, so that the sampling circuit 304 samples the current signal output by the transimpedance amplification chip 303 and outputs a sampled voltage signal to the MCU302.

The MCU302 implements a received light power intensity detection function according to the received voltage signal, where for the received light power intensity detection, a monitoring bit may be set in a register inside the MCU302, so as to implement real-time monitoring of the received light power.

When the MCU302 obtains the monitoring value of the received light power according to the voltage signal output by the sampling circuit 304, the monitoring value of the received light power may be near the alarm threshold, and at this time, the jitter of the monitoring value of the received light power may trigger the monitoring alarm by mistake, so that the light module cannot work normally.

The MCU302 includes a first register for storing the voltage signal output by the sampling circuit 304, for example, the first register stores an ADC voltage of 10V and an ADC voltage of 20V, and the received light power of the light receiving module 500 can be obtained by calibrating the ADC voltage.

The MCU302 further includes a second register, where the second register is configured to store a relationship between the ADC voltage and the received light power, and the MCU302 calibrates the ADC voltage in the first register according to the relationship to obtain a monitored value of the received light power corresponding to the ADC voltage, for example, when the ADC voltage is 10V, the monitored value of the received light power corresponding to the ADC voltage may be 1dB; at 20V, the corresponding received light power monitor value may be 2dB.

After the monitoring value of the received light power is obtained by the MCU302 according to the ADC voltage calculation, the monitoring value of the received light power is compared with the alarm range value of the received light power, and the monitoring value of the received light power is optimized according to the alarm range value of the received light power, so as to obtain the reporting value of the received light power.

The MCU302 further includes a third register, where the third register is configured to store the reported value after optimizing the received optical power monitoring value, and wait for the upper computer to read the optimized optical power reported value, so as to prevent the optical module from false alarm when working near the alarm threshold point.

Fig. 10 is a schematic diagram of a relationship between an optical power monitoring value and a reporting value in an optical module according to an embodiment of the present application. As shown in fig. 10, the received light power alarm range value of the optical module includes a low alarm threshold LW and a high alarm threshold HW, when the monitored value of the received light power is between the low alarm threshold LW and the high alarm threshold HW, the MCU reports the actual monitored value of the received light power to the upper computer, that is, the actual monitored value of the received light power is the same as the reported value, and the relationship between the actual monitored value of the received light power and the reported value is a straight line with a slope of 1.

When the monitoring value of the received light power is near the low alarm threshold LW or the high alarm threshold HW, the monitoring jitter of the received light power may trigger the monitoring alarm by mistake, and in order to avoid false alarm, the monitoring value of the received light power needs to be processed, so as to avoid false alarm triggering when the monitoring value of the received light power is near the low alarm threshold LW or the high alarm threshold HW.

Specifically, the MCU302 calculates a monitored value of the received light power according to the relationship between the ADC voltage in the first register and the ADC voltage in the second register and the received light power, if the monitored value of the received light power is located near the high alarm threshold HW of the optical module, the MCU302 compares the monitored value of the received light power with the high alarm threshold HW, determines whether the monitored value of the received light power is smaller than a sum value between the Gao Gaojing threshold HW and the first preset value, and if the monitored value of the received light power is smaller than a sum value between the Gao Gaojing threshold HW and the first preset value, indicates that the monitored value of the received light power is located between the low alarm threshold LW and the high alarm threshold HW, and reports the received light power according to a linear relationship that an actual monitored value and a reporting value of the received light power are slope 1, that is, reports the actual monitored value. In some embodiments, the first preset value may be-0.5 dBm.

If the high alarm threshold HW of the optical module is 2.5dBm, the first preset value is-0.5 dBm, when the monitored value a of the received optical power is smaller than the sum value between the Gao Gaojing threshold HW and the first preset value, i.e., a < hw+ (-0.5 dBm), and a < 2dBm, the monitored value of the received optical power is located between the alarm range (-4 dBm to 2.5 dBm) of the received optical power of the optical module, and the actual monitored value is reported.

If the monitored value of the received light power is larger than the sum value between the high alarm threshold HW and the first preset value, judging whether the monitored value of the received light power is smaller than the sum value between the Gao Gaojing threshold HW and the second preset value, if the monitored value of the received light power is larger than the sum value between the high alarm threshold HW and the first preset value and smaller than the sum value between the Gao Gaojing threshold HW and the second preset value, indicating that the monitored value of the received light power is positioned near the high alarm threshold HW, and in order to avoid false alarm, reducing the monitored value of the received light power to obtain a reporting value of the received light power, wherein the reporting value of the received light power is larger than the sum value between the high alarm threshold HW and the first preset value and smaller than the Gao Gaojing threshold HW, the relation between the monitored value of the received light power and the reporting value is a straight line connecting the sum value between the high alarm threshold HW and the first preset value and the high alarm threshold HW, and the slope of the straight line is smaller than 1; and storing the reported value of the received optical power into a third register, wherein the reported value of the received optical power is positioned between a low alarm threshold LW and a high alarm threshold HW of the optical module, and an alarm cannot be touched by mistake. In some embodiments, the second preset value may be 1dBm.

If the high alarm threshold HW of the optical module is 2.5dBm, the first preset value is-0.5 dBm, the second preset value is 1dBm, when the monitored value of the received optical power is greater than the sum value between the high alarm threshold HW and the first preset value and less than the sum value between the Gao Gaojing threshold HW and the second preset value, i.e., hw+ (-0.5 dBm) < a < hw+1dBm,2dBm < a < 3.5dBm, the monitored value of the received optical power is located near the high alarm threshold HW, the monitored value of the received optical power should be reduced to obtain the reporting value a 'of the received optical power, so that the reporting value of the received optical power is greater than the sum value between the high alarm threshold HW and the first preset value and less than Gao Gaojing threshold HW, i.e., hw+ (-0.5 dBm) < a' < HW,2dBm < a '< 2.5dBm, and thus the reporting value a' of the received optical power is located between the high alarm threshold HW and the linear alarm value of the received optical module, and the reporting value of the received optical power is not located between the receiving optical module.

If the monitored value of the received light power is larger than the sum value between the high alarm threshold HW and the second preset value, judging whether the monitored value of the received light power is smaller than the sum value between the Gao Gaojing threshold HW and the third preset value, if the monitored value of the received light power is larger than the sum value between the high alarm threshold HW and the second preset value and smaller than the sum value between the Gao Gaojing threshold HW and the third preset value, indicating that the monitored value of the received light power is larger than the high alarm threshold HW, in order to avoid jump of the reported value of the received light power, reducing the monitored value of the received light power at the moment to obtain the reported value of the received light power, wherein the reported value of the received light power is larger than the high alarm threshold HW and smaller than the sum value between the Gao Gaojing threshold HW and the third preset value, and the relation between the monitored value of the received light power and the reported value is a straight line connecting the high alarm threshold HW, the high alarm threshold HW and the sum value between the third preset value, and the slope of the straight line is larger than 1; and storing the reported value of the received optical power into a third register. In some embodiments, the third preset value may be 2dBm.

For example, the high alarm threshold HW of the optical module is 2.5dBm, the second preset value is 1dBm, the third preset value is 2dBm, when the monitored value of the received optical power is higher than the sum value between the alarm threshold HW and the second preset value and is smaller than the sum value between the threshold HW of Gao Gaojing and the third preset value, i.e. hw+1dbm < a+2dbm, 3.5dbm < a < 4.5dBm, at this time, the monitored value of the received optical power exceeds the high alarm threshold HW, and since the monitored value of the received optical power is located near the high alarm threshold HW, the reported value of the received optical power is smaller, in order to avoid the jump of the reported value of the received optical power, the monitored value of the received optical power is reduced to obtain the reported value a″ of the received optical power, so that HW < a "< hw+2dbm,2.5dbm < a" < 4.5dBm, and the reported value a″ of the received optical power is a linear value between 2.5dBm and 4.5 dBm.

If the monitored value of the received light power is greater than the sum value between the high alarm threshold HW and the third preset value, it is indicated that the monitored value of the received light power is far greater than the Gao Gaojing threshold HW, and at this time, the received light power is reported according to the relationship that the actual monitored value of the received light power and the reported value are the straight lines with the slope of 1, that is, the actual monitored value of the received light power is reported.

If the high alarm threshold HW of the optical module is 2.5dBm and the third preset value is 2dBm, when the monitored value of the received optical power is greater than the sum value between the high alarm threshold HW and the third preset value, namely a > hw+2dbm and a > 4.5dBm, the monitored value of the received optical power is far greater than the Gao Gaojing threshold HW, the actual monitored value of the received optical power is stored in the third register, and the actual monitored value of the received optical power is reported to the upper computer.

Therefore, as shown by the solid line in fig. 10, when the high alarm threshold HW of the optical module is 2.5dBm, the first preset value is-0.5 dBm, the second preset value may be 1dBm, and the third preset value is 2dBm, if the monitored value of the received optical power is located near the high alarm threshold HW, when the monitored value of the received optical power is less than 2dBm, the actual monitored value of the received optical power is reported; when the monitoring value of the received light power is between 2dBm and 3.5dBm, the reported value of the received light power is a linear value between 2dBm and 2.5 dBm; when the monitoring value of the received light power is between 3.5dBm and 4.5dBm, the reported value of the received light power is a linear value between 2.5dBm and 4.5 dBm; and when the monitoring value of the received light power is larger than 4.5dBm, reporting the actual monitoring value of the received light power.

Fig. 11 is a schematic diagram two of a relationship between an optical power monitoring value and a reporting value in an optical module according to an embodiment of the present application. As shown in fig. 11, the MCU302 calculates a monitored value of the received light power according to the relationship between the ADC voltage in the first register and the ADC voltage in the second register and the received light power, if the monitored value of the received light power is located near the low alarm threshold LW of the light module, the MCU302 compares the monitored value of the received light power with the low alarm threshold LW, determines whether the monitored value of the received light power is greater than the sum value between the low alarm threshold LW and the first set value, and if the monitored value of the received light power is greater than the sum value between the low alarm threshold LW and the first set value, it is indicated that the monitored value of the received light power is located between the low alarm threshold LW and the high alarm threshold HW, and reports the received light power according to the linear relationship that the actual monitored value and the reporting value of the received light power are slope 1, that is, at this time, the actual monitored value is reported. In some embodiments, the first set point may be 0.5dBm.

If the low alarm threshold LW of the optical module is-4 dBm, the first set value is 0.5dBm, and when the monitored value B of the received optical power is greater than the sum value between the low alarm threshold LW and the first set value, i.e., B > lw+0.5dbm, and B > -3.5dBm, the monitored value of the received optical power is located between the alarm range (-4 dBm to 2.5 dBm) of the received optical power of the optical module, and the actual monitored value is reported.

If the monitoring value of the received light power is smaller than the sum value between the low warning threshold LW and the first set value, judging whether the monitoring value of the received light power is larger than the sum value between the low warning threshold LW and the second set value, if the monitoring value of the received light power is larger than the sum value between the low warning threshold LW and the second set value and smaller than the sum value between the low warning threshold LW and the first set value, indicating that the monitoring value of the received light power is positioned near the low warning threshold LW, in order to avoid false warning, the monitoring value of the received light power should be increased to obtain the reporting value of the received light power, wherein the reporting value of the received light power is larger than the low warning threshold LW and smaller than the sum value between the low warning threshold LW and the first set value, and the relation between the monitoring value of the received light power and the reporting value is a straight line connecting the sum value between the low warning threshold LW, the low warning threshold LW and the first set value, and the slope of the straight line is smaller than 1; and storing the reported value of the received optical power into a third register, wherein the reported value of the received optical power is positioned between an alarm threshold LW and a high alarm threshold HW of the optical module, and an alarm cannot be touched by mistake. In some embodiments, the second set point may be-1 dBm.

For example, the low alarm threshold LW of the optical module is-4 dBm, the first setting value is 0.5dBm, the second setting value is-1 dBm, when the monitored value of the received optical power is greater than the sum value between the low alarm threshold LW and the second setting value and less than the sum value between the low alarm threshold LW and the first setting value, i.e., lw+ (-1 dBm) < b+0.5 dBm, -5dBm < B < -3.5dBm, at this time, the monitored value of the received optical power is located near the low alarm threshold LW, the monitored value of the received optical power should be reduced to obtain the reported value B 'of the received optical power, so that the reported value of the received optical power is greater than the low alarm threshold LW and less than the sum value between the low alarm threshold LW and the first setting value, i.e., LW < B' < lw+0.5dBm, -4dBm < B '< -3.5dBm, so that the reported value B' of the received optical power is between-4 to-3.5 dBm, and the reported value of the received optical power is not located between the low alarm threshold LW and the low alarm threshold LW.

If the monitoring value of the received light power is smaller than the sum value between the low alarm threshold LW and the second set value, judging whether the monitoring value of the received light power is larger than the sum value between the low alarm threshold LW and the third set value, if the monitoring value of the received light power is larger than the sum value between the low alarm threshold LW and the third set value and smaller than the sum value between the low alarm threshold LW and the second set value, indicating that the monitoring value of the received light power is smaller than the low alarm threshold LW, in order to avoid jump of the reporting value of the received light power, the monitoring value of the received light power should be increased to obtain the reporting value of the received light power, wherein the reporting value of the received light power is larger than the sum value between the low alarm threshold LW and the third set value and smaller than the low alarm threshold LW, and the relation between the monitoring value of the received light power and the reporting value is a straight line connecting the sum value between the low alarm threshold LW and the third set value and the low alarm threshold LW, and the slope of the straight line is larger than 1; and stores the reported value of the received optical power in a third register, which may be-2 dBm in some embodiments.

For example, the low alarm threshold LW of the optical module is-4 dBm, the second set value is-1 dBm, the third set value is-2 dBm, when the monitored value of the received optical power is greater than the sum value between the low alarm threshold LW and the third set value and less than the sum value between the low alarm threshold LW and the second set value, i.e., lw+ (-2 dBm) < lw+ (-1 dBm), -6dBm < B < -5dBm, at this time, the monitored value of the received optical power is lower than the low alarm threshold LW, and since the monitored value of the received optical power is located at the low alarm threshold LW, the reported value of the received optical power is larger, in order to avoid the jump of the reported value of the received optical power, the monitored value of the received optical power is increased to obtain the reported value b″ of the received optical power, so that lw+ (-2 dBm) < B "< -6dBm < B" < -4dBm ", and the reported value b″ of the received optical power is a linear value between-6 to-4 dBm.

If the monitored value of the received light power is smaller than the sum value between the low alarm threshold LW and the third set value, the monitored value of the received light power is far smaller than the low alarm threshold LW, and the received light power is reported according to the relation that the actual monitored value of the received light power and the reported value are straight lines with the slope of 1, namely, the actual monitored value of the received light power is reported.

If the low alarm threshold LW of the optical module is-4 dBm and the third set value is-2 dBm, when the monitored value of the received optical power is smaller than the sum value between the low alarm threshold LW and the third set value, namely, B < lw+ (-2 dBm), and B < -6dBm, the monitored value of the received optical power is far smaller than the low alarm threshold LW, the actual monitored value of the received optical power is stored in the third register, and the actual monitored value of the received optical power is reported to the upper computer.

Therefore, as shown by the solid line in fig. 11, when the low alarm threshold LW of the optical module is-4 dBm, the first set value is 0.5dBm, the second set value is-1 dBm, and the third set value is-2 dBm, if the monitored value of the received light power is located near the low alarm threshold LW, when the monitored value of the received light power is greater than-3.5 dBm, the actual monitored value of the received light power is reported; when the monitoring value of the received optical power is between-5 dBm and-3.5 dBm, the reported value of the received optical power is a linear value between-4 dBm and-3.5 dBm; when the monitoring value of the received optical power is between-6 dBm and-5 dBm, the reported value of the received optical power is a linear value between-6 dBm and-4 dBm; and when the monitoring value of the received light power is smaller than-6 dBm, reporting the actual monitoring value of the received light power.

According to the optical module provided by the embodiment of the application, the transimpedance amplifying chip, the sampling circuit and the MCU are arranged on the surface of the circuit board, and the input end of the transimpedance amplifying chip is electrically connected with the optical receiving chip of the optical receiving assembly so as to receive a current signal output by the optical receiving chip and amplify the current; the output end of the transimpedance amplifying chip is electrically connected with one end of the sampling circuit so as to transmit the amplified current signal to the sampling circuit, the sampling circuit samples the current signal to obtain a voltage signal and transmits the voltage signal to the MCU, the MCU comprises a first register and a second register, the first register is used for storing the ADC voltage output by the sampling circuit, the second register stores the conversion relation between the ADC voltage and the received light power, and the MCU obtains the monitoring value of the received light power according to the conversion relation between the ADC voltage in the first register and the ADC voltage in the second register and the received light power; the MCU compares the monitoring value of the received light power with the alarm range of the received light power, if the monitoring value of the received light power is near a high alarm threshold HW of the light module, when the monitoring value of the received light power is smaller than the sum value between a Gao Gaojing threshold HW and a first preset value, the MCU reports the actual monitoring value of the received light power; when the monitoring value of the received light power is larger than the sum value between the high alarm threshold HW and the first preset value and smaller than the sum value between the Gao Gaojing threshold HW and the second preset value, the reporting value of the received light power is set to be a linear value on a straight line connecting the sum value between the high alarm threshold HW and the first preset value and the high alarm threshold HW; when the monitoring value of the received light power is larger than the sum value between the high alarm threshold HW and the second preset value and smaller than the sum value between the Gao Gaojing threshold HW and the third preset value, the reported value of the received light power is set to be a linear value on a straight line connecting the sum value among the high alarm threshold HW, the high alarm threshold HW and the third preset value; and when the monitoring value of the received light power is larger than the sum value between the high alarm threshold HW and the third preset value, reporting the actual monitoring value of the received light power. The first preset value is smaller than the second preset value, and the second preset value is smaller than the third preset value.

If the monitoring value of the received light power is positioned near the low alarm threshold LW of the light module, reporting the actual monitoring value of the received light power when the monitoring value of the received light power is larger than the sum value between the low alarm threshold LW and the first set value; when the monitoring value of the received light power is larger than the sum value between the low warning threshold LW and the second set value and smaller than the sum value between the low warning threshold LW and the first set value, the reporting value of the received light power is set to be a linear value on a straight line connecting the sum values of the low warning threshold LW, the low warning threshold LW and the first set value; when the monitoring value of the received light power is larger than the sum value between the low warning threshold LW and the third set value and smaller than the sum value between the low warning threshold LW and the second set value, the reporting value of the received light power is set to be a linear value on a straight line connecting the sum value between the low warning threshold LW and the third set value and the low warning threshold LW; and when the monitoring value of the received light power is smaller than the sum value between the low warning threshold LW and the third set value, reporting the actual monitoring value of the received light power. Wherein the first set point is greater than the second set point, and the second set point is greater than the third set point.

When the received light power is near the high alarm threshold HW or the low alarm threshold LW, the monitoring value of the received light power is optimized, the optimized reported value of the received light power is stored in the third register of the MCU, the upper computer is waited to read the reported value of the received light power, and the optimized reported value of the received light power avoids false alarm when the optical module works near the alarm threshold point, so that the normal work of the optical module is ensured.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. An optical module, comprising:

a circuit board;

2. The light module of claim 1, wherein the alert threshold of the light module comprises a high alert threshold, the MCU storing an actual monitored value of the received light power to the third register when the monitored value of the received light power is less than a sum between the Gao Gaojing threshold and the first preset value when the monitored value of the received light power is at the high alert threshold;

storing a linear value connecting the sum value between the Gao Gaojing threshold and the first preset value, the Gao Gaojing threshold, to the third register when the monitored value of the received light power is greater than the sum value between the Gao Gaojing threshold and the first preset value and less than the sum value between the Gao Gaojing threshold and the second preset value;

storing a linear value connecting the sum value between the Gao Gaojing threshold value, the Gao Gaojing threshold value, and the third preset value to the third register when the monitored value of the received light power is greater than the sum value between the Gao Gaojing threshold value and the second preset value and less than the sum value between the Gao Gaojing threshold value and the third preset value;

and when the monitoring value of the received light power is larger than the sum value between the Gao Gaojing threshold value and the third preset value, storing the actual monitoring value of the received light power into the third register.

3. The light module of claim 2, wherein the first preset value is less than the second preset value, and wherein the second preset value is less than the third preset value.

4. A light module as recited in claim 3, wherein the first predetermined value is-0.5 dBm, the second predetermined value is 1dBm, and the second predetermined value is 2dBm.

5. The light module of claim 1, wherein the alarm threshold of the light module further comprises a low alarm threshold, the MCU storing an actual monitored value of the received light power to the third register when the monitored value of the received light power is greater than a sum between the low alarm threshold and a first set value when the monitored value of the received light power is at the low alarm threshold;

storing a linear value connecting the low alarm threshold, and the sum value between the first set value to the third register when the monitored value of the received light power is greater than the sum value between the low alarm threshold and the second set value and less than the sum value between the low alarm threshold and the first set value;

storing a linear value connecting the sum value between the low alarm threshold and the third setting value and the low alarm threshold to the third register when the monitored value of the received light power is larger than the sum value between the low alarm threshold and the third setting value and smaller than the sum value between the low alarm threshold and the second setting value;

And when the monitoring value of the received light power is smaller than the sum value between the low alarm threshold value and the third set value, storing the actual monitoring value of the received light power into the third register.

6. The light module of claim 5 wherein the first set point is greater than the second set point and the second set point is greater than the third set point.

7. The optical module of claim 6, wherein the first set point is 0.5dBm, the second set point is-1 dBm, and the second set point is-2 dBm.

8. The optical module of claim 1, wherein the alarm threshold of the optical module ranges from-4 dBm to 2.5dBm.

9. The optical module of claim 1, further comprising a transimpedance amplification chip having an input electrically connected to the light receiving chip and an output electrically connected to the input of the sampling circuit; the transimpedance amplifying chip is used for receiving the current signal and outputting the amplified current signal.

10. The optical module of claim 9, wherein the sampling circuit comprises a sampling resistor, one end of the sampling resistor is connected to the output end of the transimpedance amplification chip, the other end of the sampling resistor is grounded, and the third end of the sampling resistor is electrically connected to the MCU.