CN113824504A - Optical module - Google Patents

Abstract

The application provides an optical module, including the circuit board, with the light receiving assembly of circuit board connection and locate the MCU on the circuit board. The light receiving assembly is used for generating photo-generated current. The MCU is provided with a target sampling value corresponding to the target light intensity. The target light intensity is used to decide the RX-LOS signal. The target sampling value of the optical module is not equal to the target sampling values of other optical modules, but is equal to the target light intensities of other optical modules, and the target sampling value is obtained by inverse calculation of the target light intensities. Since the range over which all optical modules generate LOS signals is the same, the target optical intensity to generate LOS signals is the same. In the application, the target sampling value is obtained by utilizing the reverse calculation of the target light intensity, the target sampling value can be set as the RX-LOS threshold value, the RX-LOS threshold value matched with the light receiving component can be obtained without additionally increasing procedures, the RX-LOS threshold value self-adaption function is realized, independent debugging is not needed, and the production efficiency is improved.

Description

Optical module

Technical Field

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

Background

In an optical module product, an RX-LOS (Receive LOSs of Signal Alarm) pin is usually designed. And in the using process, whether the receiving signal of the optical module is lost or not is judged by monitoring the RX-LOS state. With the rapid increase of the social bandwidth demand, the optical module starts to realize rate conversion and signal amplification by means of the DSP. And the DSP does not have an RX-LOS function, and cannot meet the functional requirements of the optical module.

In order to solve the problem, a software algorithm is arranged in the MCU of the traditional optical module, and the software algorithm in the MCU is utilized to realize the RX-LOS function. The specific process is as follows: firstly, inputting an optical signal into a light receiving submodule to generate a photo-generated current; secondly, generating a mirror image by the photo-generated current through a mirror image circuit; thirdly, sampling the photo-generated current by an ADC (Analog-to-Digital Converter) through the MCU to obtain a sampling value; then, comparing the sampling value with an RX-LOS threshold preset by the MCU, outputting a low level when the sampling value is greater than the RX-LOS threshold, and outputting a high level when the sampling value is less than the RX-LOS threshold; and finally, outputting the high and low levels by a GPIO pin of the MCU.

RX-LOS judgment can be realized by setting a software algorithm in the MCU of the optical module. However, the photo-responsivity of different light receiving components is different, and the photo-generated current intensity of the light receiving components is different. If a fixed RX-LOS threshold value is set, different RX-LOS threshold values appear in each optical module, and the difference is large, so that the target light intensity is obviously different or even abnormal when the RX-LOS is judged, and the use requirement is difficult to meet. Therefore, in the production process of the optical modules, each optical module needs to be individually debugged and set to the RX-LOS threshold matched with the optical receiving component of the optical module. This easily increases optical module production man-hour, influences production efficiency.

Disclosure of Invention

The application provides an optical module, which realizes an RX-LOS threshold value self-adaption function and improves production efficiency.

A light module, comprising:

a circuit board;

the light receiving assembly is electrically connected with the circuit board and used for generating photo-generated current;

the MCU is arranged on the circuit board and is provided with a target sampling value corresponding to target light intensity, wherein the target light intensity is used for judging an RX-LOS signal;

the target sampling value is not equal to the target sampling values of other optical modules but equal to the target light intensities of the other optical modules, wherein the target sampling value is obtained by performing inverse calculation on the target light intensities through a fitting relational expression.

Has the advantages that: the application provides an optical module, including the circuit board, with the light receiving component of circuit board electricity connection and set up the MCU on the circuit board. The light receiving assembly is used for generating photo-generated current. The MCU is provided with a target sampling value corresponding to the target light intensity. The target light intensity is used to decide the RX-LOS signal. The target sampling value of the optical module is not equal to the target sampling values of other optical modules, but is equal to the target light intensities of other optical modules, wherein the target sampling value is obtained by reverse calculation of the target light intensities. Since the range over which all optical modules generate LOS signals is the same, the target optical intensity to generate LOS signals is the same. However, because the photoelectric responsivity of each optical module is different, the photo-generated current intensity of each optical module is different, and in order to realize the RX-LOS threshold value self-adaption function of the optical module, in the application, the target sampling value is obtained by performing inverse calculation on the target light intensity by using a fitting relation. Since the target sampling value can be set as the RX-LOS threshold, the target sampling value can also be converted into the output voltage output by the MCU. In the method, the target sampling value is obtained by directly utilizing the target light intensity reverse calculation, and the RX-LOS threshold value matched with the light receiving component of the optical module can be obtained without additionally increasing the process, so that the RX-LOS threshold value self-adaption function is realized, independent debugging is not needed, and the production efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal;

FIG. 2 is a schematic diagram of an optical network unit;

fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;

fig. 4 is an exploded schematic structural diagram of an optical module according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of a target light intensity reporting function of an optical module according to an embodiment of the present application;

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

FIG. 7 is a schematic block diagram corresponding to FIG. 6;

fig. 8 is a schematic structural diagram of another circuit board according to an embodiment of the present disclosure;

FIG. 9 is a schematic block diagram corresponding to FIG. 8;

fig. 10 is a schematic structural diagram of a determining circuit according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish 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, it is necessary to perform interconversion between the electric signal and the optical signal.

The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

one end of the optical fiber 101 is connected with a far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.

An optical port of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical signal connection with the optical network terminal 100; the optical module realizes the interconversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module 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 and input to the optical fiber.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104, which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.

At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, provides data signals for the optical module, and receives the data signals from the optical module, and the common upper computer of the optical module also comprises an optical line terminal and the like.

Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 has a circuit board 105, and a cage 106 is disposed on a surface of the circuit board 105; an electric connector is arranged in the cage 106 and used for connecting an electric port of an optical module such as a golden finger; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into the optical network terminal, specifically, the electrical port of the optical module is inserted into the electrical connector inside the cage 106, and the optical port of the optical module is connected to the optical fiber 101.

The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, held by the cage, and the heat generated by the optical module is conducted to the cage 106 and then diffused by the heat sink 107 on the cage.

Fig. 3 is a schematic structural diagram of an optical module 200 according to an embodiment of the present disclosure. Fig. 4 is an exploded schematic view of an optical module 200 according to an embodiment of the present disclosure. Fig. 5 is a schematic diagram of a target light intensity reporting function of an optical module according to an embodiment of the present application. Fig. 6 is a schematic structural diagram of a circuit board according to an embodiment of the present disclosure. Fig. 7 is a schematic structural view corresponding to fig. 6. Fig. 8 is a schematic structural diagram of another circuit board according to an embodiment of the present disclosure. Fig. 9 is a schematic structural view corresponding to fig. 8. As shown in fig. 3 to 9, two optical modules 200 provided in the embodiments of the present application each include an upper housing 201, a lower housing 202, an unlocking handle 203, a circuit board 204, a light emitting module 205, and a light receiving module 206.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a cover plate, and the cover plate covers two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned at two sides of the cover plate and are perpendicular to the cover plate, and the two side walls are combined with the two side plates to realize that the upper shell covers the lower shell.

The two openings may be two openings located at the same end of the optical module, or two openings located at different ends of the optical module; one opening is an electric port, and a gold finger of the circuit board extends out of the electric port and is inserted into an upper computer such as an optical network unit; the other opening is an optical port for external optical fiber access to connect the optical transmitting assembly 205 and the optical receiving assembly 206 inside the optical module; optoelectronic devices such as circuit board 204, light emitting assembly 205 and light receiving assembly 206 are located in the package cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 204, the light emitting assembly 205, the light receiving assembly 206 and other devices can be conveniently installed in the shell, and the outermost packaging protection shell of the optical module is formed by the upper shell and the lower shell; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the shell of the optical module cannot be made into an integrated structure, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation structure and the electromagnetic shielding structure cannot be installed, and the production automation is not facilitated.

The unlocking handle 203 is located on the outer wall of the wrapping cavity/lower shell 202 and used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

The unlocking handle 203 is provided with a clamping structure matched with the upper computer cage; the tail end of the unlocking handle is pulled to enable the unlocking handle to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer through a clamping structure of the unlocking handle; by pulling the unlocking handle, the clamping structure of the unlocking handle moves along with the unlocking handle, so that the connection relation between the clamping structure and the upper computer is changed, the clamping relation between the optical module and the upper computer is relieved, and the optical module can be drawn out from the cage of the upper computer.

The circuit board 204 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as a microprocessor MCU207, a laser driver chip, a limiting amplifier, a clock data recovery CDR, a power management chip, and a data processing chip DSP). The MCU207 is used for setting an RX-LOS threshold value, and the DSP is used for digital signal processing.

The circuit board 204 connects the electrical devices in the optical module together according to circuit design through circuit wiring to realize electrical functions such as power supply, electrical signal transmission, grounding and the like.

The circuit board 204 is generally a rigid circuit board, which can also realize a bearing effect due to its relatively hard material, for example, the rigid circuit board can stably bear a chip; the rigid circuit board may also provide a smooth load bearing when the light emitting assembly 205 and the light receiving assembly 206 are located on the circuit board; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.

A flexible circuit board is also used in a part of the optical module to supplement a rigid circuit board; the flexible circuit board is generally used in combination with a rigid circuit board, for example, the rigid circuit board may be connected to the optical transceiver device through the flexible circuit board.

And the light emitting component 205 and the light receiving component 206 are electrically connected with the circuit board 204 and are respectively used for realizing the emission of optical signals and the reception of the optical signals. The light emitting element 205 and the light receiving element 206 may be combined together to form an integrated light transmitting and receiving structure.

The light receiving component 206 enables the reception of light signals and generates photo-generated current. Since the photo-generated current is needed not only for determining the output RX-LOS signal, but also for providing current to TIA (trans-impedance amplifier, disposed in the optical receiving component) and DSP209 for processing. Therefore, the photo-generated current generated by the light receiving component 206 needs to be divided into two paths of photo-generated current through the mirror circuit, one path of photo-generated current flows to the TIA and the DSP209, and the other path of photo-generated current flows to the determining circuit 207.

And a mirror circuit disposed in the light receiving element 206. When the mirror circuit is disposed in the light receiving element 206, the light receiving element 206 outputs a path of photo-generated current, and the path of photo-generated current flows to the determining circuit 207. Wherein the other photo-generated current is transmitted to the TIA and the DSP209 within the photo-receiving component 206.

Because the optical module has a function of reporting the target light intensity, the specific process of reporting the target light intensity is as follows: first, the light receiving module 206 receives a light signal and converts the light signal to generate a photo-generated current. And secondly, the photo-generated current generates a mirror image through the mirror image circuit to obtain two paths of photo-generated currents, wherein one path of photo-generated current flows to the MCU207, and the other path of photo-generated current flows to the TIA and the DSP. Third, the MCU207 samples the photo-generated current flowing into the MCU207 to obtain a plurality of different actual sample values. Then, the MCU207 fits the actual light intensity to the plurality of actual sample values by a fitting algorithm to obtain a fitting relation. Finally, after the optical signal is input, the MCU207 collects an actual sampling value, substitutes the actual sampling value into the fitting relation to obtain an actual light intensity, and the upper computer reads the actual light intensity through I2C communication.

The MCU207 is provided with a target sampling value corresponding to the target light intensity. The target sampling value is a target ADC sampling value obtained by sampling by the MCU207 using the ADC. In the optical module, the target sampling value is not equal to the target sampling values of other optical modules but equal to the target light intensities of the other optical modules, wherein the target sampling value is obtained by performing inverse calculation on the target light intensities through a fitting relation. Wherein the fitting relation is as follows:

Y＝F(X)，

wherein Y is the target light intensity, X is the target sampling value, and F is the functional relation of Y and X.

Since the range over which all optical modules generate the RX-LOS signal is the same, the target optical intensity at which the RX-LOS signal is generated is the same. The target light intensity is used to determine the RX-LOS signal. The RX-LOS signal is high when the actual light intensity is greater than the target light intensity, and low when the actual light intensity is less than the target light intensity. However, because the photoelectric responsivity of each optical module is different, the photo-generated current intensity of each optical module is different, and in order to realize the RX-LOS threshold value self-adaption function of the optical module, in the application, the target sampling value is obtained by performing inverse calculation on the target light intensity by using a fitting relation.

The specific process of obtaining the target sampling value by inverse calculation of the target light intensity by using the fitting relational expression is as follows: first, a target light intensity Y1 at which the RX-LOS signal is generated is set. Next, a fitting formula Y obtained by the target intensity reporting function is inverted to f (X), and a target sample value X1 corresponding to the target intensity is obtained. Again, the target sample value X1 is set to the RX-LOS threshold of the MCU in the optical module shown in fig. 6 and 7, or the target sample value X1 is converted to the output voltage output by the MCU in the optical module shown in fig. 8 and 9.

Because the target light intensity of each optical module is equal, but the response intensity of the light receiving assembly of each optical module is different, and the fitting relation of each optical module is different, the target light intensity is inversely calculated by using the fitting relation to obtain a target sampling value corresponding to each optical module, and the target sampling value corresponding to each optical module is set as an RX-LOS threshold value or is converted into an output voltage output by the MCU. Each optical module can judge the RX-LOS signal according to the respective RX-LOS threshold or the output voltage output by the MCU, so that each optical module generates the RX-LOS signal when the target light intensity is Y1.

When the target sampling value is set to be the RX-LOS threshold, the MCU207 is configured to determine, as shown in fig. 6 and 7, an RX-LOS signal according to the obtained actual sampling value and the RX-LOS threshold. Specifically, when the actual sampling value is greater than the RX-LOS threshold value, the RX-LOS signal is at a high level; when the actual sample value is less than the RX-LOS threshold, the RX-LOS signal is low.

When the target sampling value is converted into the output voltage output by the MCU, the optical module may further include a determining circuit 208, as shown in fig. 8 to 9.

The judgment circuit 208 is disposed on the circuit board 204, and has a first input end electrically connected to the light receiving element 206 and a second input end electrically connected to the MCU, and is configured to judge to obtain an RX-LOS signal according to a first input voltage at the first input end and a second input voltage at the second input end, and output the RX-LOS signal. Specifically, when the first input voltage is greater than K1, the RX-LOS signal is high. When the first input voltage is less than K2, the RX-LOS signal is low, and K1/K2 is related to the second input voltage at the second input terminal. The first input voltage of the first input end is voltage obtained by photo-generated current flowing into the first input end, and the second input voltage of the second input end is output voltage output by the MCU.

Fig. 10 is a schematic structural diagram of a determining circuit according to an embodiment of the present application. As shown in fig. 10, the determination circuit 208 includes a first resistor 2081, an operational amplifier 2082, a voltage divider circuit 2083, a MOS transistor 2084, a fourth resistor 2085, and a third resistor 2086. In particular, the method comprises the following steps of,

and the input end of the first resistor 2081 is electrically connected with the light receiving component 206.

And the operational amplifier 2082, a first input end of which is electrically connected with the output end of the first resistor 2081, and a second input end of which is electrically connected with the MCU208, is used for determining to obtain a first RX-LOS signal according to a first voltage at the first input end and a second voltage at the second input end.

And the input end of the voltage division circuit 2083 is electrically connected with the output end of the operational amplifier 2082, and the output end of the voltage division circuit 2083 is electrically connected with the first input end of the operational amplifier 2082. The voltage divider circuit 2083 is a second resistor R2. The second resistor R2 is used to divide the voltage output from the output terminal of the operational amplifier 2082.

In the initial state, the first input voltage α at the first input terminal of the determination circuit 208 is 0, and the second input voltage β at the second input terminal of the determination circuit 208 is > 0. At this time, the first voltage + IN of the first input terminal of the operational amplifier 2082 is 0, and the second voltage-IN of the second input terminal of the operational amplifier 2082 is β. When + IN < -IN, the output terminal of the operational amplifier 2082 outputs a low level (VOUT ═ 0), and the first RX-LOS signal output by the first output terminal of the judgment circuit 208 is a low level.

As the actual light intensity increases, the first input voltage α at the first input terminal of the determining circuit 208 increases, and the second input voltage β at the second input terminal of the determining circuit 208 does not change. At this time, the first voltage + IN of the first input terminal of the operational amplifier 2082 is R2/(R1+ R2) × α, and the second voltage-IN of the second input terminal of the operational amplifier 2082 is β. When + IN > -IN, the output terminal of the operational amplifier 2082 outputs a high level (VOUT ═ 3), and the first output terminal of the judgment circuit 208 outputs the first RX-LOS signal as a high level. That is, α > (R1+ R2) × β/R2 was obtained from R2/(R1+ R2) × α > β.

The first voltage + IN ═ R2/(R1+ R2) × α at the first input terminal of the operational amplifier 2082 is calculated as follows: in the initial state, the output terminal of the determining circuit 208 outputs a low voltage, i.e., VOUT is equal to 0. Since the first resistor 2081 and the second resistor R2 are connected IN series, the current I flowing through the first resistor 2081 and the second resistor R2 is α/(R1+ R2), and at this time, the first voltage at the first input terminal of the operational amplifier 2082 is equal to the first input voltage at the first input terminal of the determination circuit 208 minus the voltage flowing through the first resistor 2081, i.e., + IN ═ R2/(R1+ R2) ·. At this time, the voltage flowing through the first resistor is α × R1/(R1+ R2).

When the actual light intensity decreases, the input voltage α at the first input terminal of the determining circuit 208 decreases accordingly, and the second input voltage β at the second input terminal of the determining circuit 208 does not change. At this time, the first voltage + IN of the first input terminal of the operational amplifier 2082 is α - (α -3) × R1/(R1+ R2), and the second voltage-IN of the second input terminal of the operational amplifier 2082 is β. When + IN < -IN, the output terminal of the operational amplifier 2082 outputs a low voltage (VOUT ═ 0), and the first output terminal of the judgment circuit 208 outputs the first RX-LOS signal at a low level. Namely, α < (R1+ R2) > β/R2-3R1/R2 was obtained from α - (α -3) × R1/(R1+ R2) < β.

The first voltage + IN ═ α - (α -3) × R1/(R1+ R2) at the first input terminal of the operational amplifier 2082 is calculated as follows: the actual light intensity increases, and the output terminal of the determination circuit 208 outputs a high voltage, i.e., VOUT equals 3. Since the first resistor 2081 and the second resistor R2 are connected IN series, the current I flowing through the first resistor and the second resistor is (α -3)/(R1+ R2), and at this time, the first voltage at the first input terminal of the operational amplifier 2082 is equal to the first input voltage at the first input terminal of the determination circuit 208 minus the voltage flowing through the first resistor, i.e., + IN ═ R2/(R1+ R2) ×. At this time, the voltage across the first resistor 2081 is (α -3) × R1/(R1+ R2).

In combination with the above, in the present application, after the first resistor 2081 and the second resistor R2 are set, the RX-LOS signal determining function and the RX-LOS signal delaying function can be realized only by setting the second input voltage β at the second input terminal of the determining circuit 208.

In this case, K1 is made (R1+ R2) × β/R2, K2 is made (R1+ R2) × β/R2-3R1/R2, and K1-K2 is calculated as 3 × R1/R2, that is, the RX-LOS signal determination hysteresis coefficient of the determination circuit 208 is 3 × R1/R2. Combining the hysteresis coefficient, the RX-LOS signal hysteresis can be changed only by adjusting the first resistor 2081 and the second resistor R2.

When the first input voltage at the first input terminal of the determining circuit 208 is greater than K1, the first output terminal of the determining circuit 208 outputs a high level. When the first input voltage at the first input terminal of the determining circuit 208 is less than K2, the first output terminal of the determining circuit 208 outputs a low level, wherein K1 and K2 are both related to the second input voltage β at the second input terminal of the determining circuit 208.

And the MOS tube 2084, the grid electrode of which is electrically connected with the output end of the operational amplifier 2082, the source electrode of which is grounded, and the drain electrode of which is connected with the power supply, is used for obtaining a second RX-LOS signal.

And the input end of the fourth resistor 2085 is electrically connected with the drain electrode of the MOS tube 2084, and the output end of the fourth resistor 2085 is connected with a power supply. The fourth resistor 2085 is used for sharing the voltage output by the power supply, so that the MOS transistor 2084 works normally.

And an input end of the third resistor 2086 is electrically connected with the MCU, and an output end of the third resistor 2086 is electrically connected with a second input end of the operational amplifier 2082.

The application provides an optical module, including the circuit board, with the light receiving component of circuit board electricity connection and set up the MCU on the circuit board. The light receiving assembly is used for generating photo-generated current. The MCU is provided with a target sampling value corresponding to the target light intensity. The target light intensity is used to decide the RX-LOS signal. The target sampling value of the optical module is not equal to the target sampling values of other optical modules, but is equal to the target light intensities of other optical modules, wherein the target sampling value is obtained by reverse calculation of the target light intensities. Since the range over which all optical modules generate LOS signals is the same, the target optical intensity to generate LOS signals is the same. However, because the photoelectric responsivity of each optical module is different, the photo-generated current intensity of each optical module is different, and in order to realize the RX-LOS threshold value self-adaption function of the optical module, in the application, the target sampling value is obtained by performing inverse calculation on the target light intensity by using a fitting relation. Since the target sampling value can be set as the RX-LOS threshold, the target sampling value can also be converted into the output voltage output by the MCU. In the method, the target sampling value is obtained by directly utilizing the target light intensity reverse calculation, and the RX-LOS threshold value matched with the light receiving component of the optical module can be obtained without additionally increasing the process, so that the RX-LOS threshold value self-adaption function is realized, independent debugging is not needed, and the production efficiency is improved.

The same and similar parts among the embodiments in the specification are referred to each other. It is noted that, in this document, relational terms such as "first" and "second," and the like, may be 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 process, method, 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 process, method, article, or apparatus.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. A light module, comprising:

a circuit board;

the light receiving assembly is electrically connected with the circuit board and used for generating photo-generated current;

the MCU is arranged on the circuit board and is provided with a target sampling value corresponding to target light intensity, wherein the target light intensity is used for judging an RX-LOS signal;

the target sampling value is not equal to the target sampling values of other optical modules but equal to the target light intensities of the other optical modules, wherein the target sampling value is obtained by performing inverse calculation on the target light intensities through a fitting relation.

2. The optical module of claim 1, wherein the target sample value is set to an RX-LOS threshold or scaled to an output voltage output by the MCU.

3. The optical module of claim 2, wherein the fitting relationship is as follows:

Y＝F(X)，

wherein Y is the target light intensity, X is the target sampling value, and F is the functional relation of Y and X.

4. The optical module of claim 1, wherein when the target sample value is set to RX-LOS threshold, the MCU is configured to determine an RX-LOS signal according to the obtained actual sample value and the RX-LOS threshold, and output the RX-LOS signal.

5. The optical module according to claim 1, wherein when the target sampling value is converted to an output voltage output by the MCU, the optical module further comprises a determination circuit;

the judgment circuit is arranged on the circuit board, a first input end is electrically connected with the light receiving component, a second input end is electrically connected with the MCU, and the judgment circuit is used for judging to obtain an RX-LOS signal according to a first input voltage of the first input end and a second input voltage of the second input end and outputting the RX-LOS signal, wherein the first input voltage of the first input end is a voltage obtained by the photo-generated current flowing into the first input end, and the second input voltage of the second input end is an output voltage output by the MCU.

6. The light module of claim 1, further comprising:

and the DSP is electrically connected with the light receiving component.

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