CN217034336U

CN217034336U - Optical module

Info

Publication number: CN217034336U
Application number: CN202220934545.XU
Authority: CN
Inventors: 王华强; 孙祥勋; 马鹏飞; 朱华; 杨思更
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-07-22
Anticipated expiration: 2032-04-21

Abstract

The application provides an optical module, includes: a circuit board provided with a current source circuit; the laser is electrically connected with the current source circuit and emits light according to the bias current provided by the current source circuit; the current source circuit includes: the input end of the voltage conversion unit is electrically connected with the power supply pin of the golden finger and is used for voltage reduction conversion; the input end of the voltage stabilizing unit is electrically connected with the output end of the voltage conversion unit, and the output end of the voltage stabilizing unit is connected with the laser; the sampling unit is connected between the voltage stabilizing unit and the laser in series; and the first input end of the control unit is electrically connected with one end of the sampling unit, the second input end of the control unit is electrically connected with the other end of the sampling unit, and the output end of the control unit is connected with the control end of the voltage stabilizing unit, so that the voltage stabilizing unit inputs bias current to the laser according to the control of the control unit. The optical module provided by the application provides stable bias current for a laser through a current source circuit comprising a voltage conversion unit, a voltage stabilizing unit, a sampling unit and a control unit.

Description

Optical module

Technical Field

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

Background

With the development of new services and application modes such as cloud computing, mobile internet, video and the like, the development and progress of the optical communication technology become increasingly important. In the optical communication technology, an optical module is a tool for realizing the interconversion of optical signals and is one of key devices in optical communication equipment, and the transmission rate of the optical module is continuously increased along with the development requirement of the optical communication technology.

In an optical module, a laser is one of important devices for converting an electrical signal into an optical signal, and the laser is a current-type device, and in order to ensure stable operation of the laser, a stable bias current needs to be provided for the laser.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an optical module which can guarantee stable work of a laser.

The application provides an optical module, includes: a circuit board provided with a current source circuit;

the laser is electrically connected with the current source circuit and emits light according to the bias current provided by the current source circuit;

wherein the current source circuit includes:

the input end of the voltage conversion unit is electrically connected with the power supply pin of the golden finger and is used for voltage reduction conversion;

the input end of the voltage stabilizing unit is electrically connected with the output end of the voltage conversion unit, and the output end of the voltage stabilizing unit is connected with the laser;

the sampling unit is connected between the voltage stabilizing unit and the laser in series;

and the first input end of the control unit is electrically connected with one end of the sampling unit, the second input end of the control unit is electrically connected with the other end of the sampling unit, and the output end of the control unit is connected with the control end of the voltage stabilizing unit, so that the voltage stabilizing unit inputs bias current to the laser according to the control of the control unit.

In the optical module that this application provided, set up current source circuit on the circuit board, the power supply pin of golden finger passes through current source circuit and connects the laser instrument to provide stable bias current to the laser instrument through current source circuit, make the laser instrument normally luminous. The current source circuit comprises a voltage conversion unit, a voltage stabilizing unit, a sampling unit and a control unit, wherein the voltage conversion unit is used for voltage reduction conversion to carry out primary voltage reduction, and then the voltage output to the laser is regulated dynamically by combining the sampling unit and the control unit through the voltage stabilizing unit, so that the bias current for normal light emitting of the laser is stable, and the laser works stably. Meanwhile, in the optical module provided by the application, the second-level voltage reduction from the golden finger power supply pin to the laser is realized through the voltage conversion unit, the voltage stabilizing unit, the sampling unit and the control unit, so that the current source circuit has the advantage of low power consumption loss.

Drawings

In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art according to the drawings. Furthermore, the drawings in the following description may be considered as schematic diagrams, and do not limit the actual size of products, the actual flow of methods, the actual timing of signals, and the like, involved in the embodiments of the present disclosure.

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

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

fig. 3 is a schematic structural diagram of an optical module according to some embodiments;

fig. 4 is an exploded view of a light module provided in accordance with some embodiments;

fig. 5 is a schematic diagram of an internal structure of a light module according to some embodiments;

FIG. 6 is a schematic diagram of a current source circuit provided in accordance with some embodiments;

fig. 7 is a schematic diagram of a current source circuit according to some embodiments.

Detailed Description

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

In the field of optical fiber communication technology, signals transmitted by information transmission devices such as optical fibers or optical waveguides are optical signals, and signals that can be recognized and processed by information processing devices such as computers are electrical signals, so that the optical signals and the electrical signals need to be converted into each other by using optical modules.

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

In the optical module 200, an optical port is configured to be connected with the optical fiber 101, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100, so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. The optical module 200 converts an optical signal and an electrical signal to each other, so that the optical fiber 101 and the optical network terminal 100 are connected to each other.

The optical network terminal 100 is provided with an optical module interface 102 and a network cable interface 104. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 establishes a bidirectional electrical signal connection with the optical module 200; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. The optical module 200 is connected to the network cable 103 via the optical network terminal 100. The upper computer of the Optical module 200 may include an Optical Line Terminal (OLT) and the like in addition to the Optical network Terminal 100.

Fig. 2 is a block diagram of an optical network terminal according to some embodiments, and as shown in fig. 2, the optical network terminal 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on a surface of the PCB circuit board 105, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a projection such as a fin that increases a heat radiation area.

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

Fig. 3 is a block diagram of an optical module according to some embodiments, and fig. 4 is an exploded view of an optical module according to some embodiments. As shown in fig. 3 and 4, the optical module 200 includes a housing, a circuit board 300 disposed in the housing, an unlocking member 203 disposed on the housing, and a lens assembly 400.

The shell comprises an upper shell 201 and a lower shell 202, wherein the upper shell 201 is covered on the lower shell 202 to form the shell with two

openings

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

The direction of the connecting line of the two

openings

204 and 205 may be the same as the length direction of the optical module 200, or may not be the same as the length direction of the optical module 200. Wherein, the opening 204 is an electric port, and the golden finger of the circuit board 300 extends out of the electric port 204 and is inserted into the upper computer; the opening 205 is an optical port configured to receive the external optical fiber 101 so that the optical fiber 101 is connected to the inside of the optical module 200.

The upper shell 201 and the lower shell 202 are combined in an assembly mode, so that devices such as the circuit board 300 can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 can form packaging protection for the devices. In some embodiments, the upper housing 201 and the lower housing 202 are generally made of metal materials, which is beneficial to achieve electromagnetic shielding and heat dissipation.

In some embodiments, the light module 200 further comprises an unlocking member 203 located on an outer wall of its housing. When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is clamped 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, and the connection relationship between the engaging member and the upper computer is changed, so that the engagement between the optical module 200 and the upper computer is released.

The circuit board 300 includes circuit traces, electronic components, and chips, and the electronic components and the chips are connected together by the circuit traces according to a circuit design.

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

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

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

Fig. 5 is a schematic diagram of an internal structure of a light module according to some embodiments. As shown in fig. 4 and 5, in the embodiment of the present application, one end of the jaw assembly 500 is connected to the lens assembly 400, the lens assembly 400 is disposed at one end of the circuit board 300 close to the optical port, the lens assembly 400 is directly connected to the jaw assembly 500, and optical connection between the lens assembly 400 and the external optical fiber is established through the jaw assembly 500, so that direct transmission of optical signals between the lens assembly 400 and the external optical fiber between the external optical fiber and the lens assembly 400 is realized, an optical fiber ribbon required for transmission of optical signals between the lens assembly and the external optical fiber in a conventional optical module is saved, a space used for disposing an optical fiber ribbon in the optical module is further reduced, reliability risk caused by damage of the optical fiber ribbon is reduced, and manufacturing cost is reduced. Of course, the optical module provided in the embodiments of the present application includes, but is not limited to, the optical module with the structure shown in fig. 4 and 5.

As shown in fig. 5, a laser 310 is disposed below the lens assembly 400, and the laser 310 is electrically connected to the circuit board 300. In order to ensure the normal operation of the laser 310, a stable bias current needs to be provided to the laser 310 through the circuit board 300 during the operation of the optical module. In some embodiments of the present application, a current source chip may be disposed on the circuit board 300, and then a stable bias current may be provided to the laser 310 by controlling the current source chip. In the present embodiment, the laser 310 includes but is not limited to an EML laser.

However, considering that the cost price of the current source chip is high, in some embodiments of the present application, a relatively inexpensive device is selected and combined on the circuit board 300 to form a current source circuit, so as to provide a stable bias current for the laser 310. Fig. 6 is a schematic diagram of a current source circuit according to some embodiments of the present application. As shown in fig. 5 and 6, in some embodiments of the present application, the current source circuit includes a voltage converting unit 320, a voltage stabilizing unit 330, a sampling unit 340, and a control unit 350. The voltage conversion unit 320 is used for voltage conversion, an input end of the voltage conversion unit 320 is electrically connected to a power supply pin of the gold finger, in this embodiment, the electrical connection includes direct connection through a circuit trace of the circuit board 300, and other devices may also be disposed between the connected circuits. The input end of the voltage stabilizing unit 330 is electrically connected to the output end of the voltage converting unit 320, the output end of the voltage stabilizing unit 330 is connected to the input end of the sampling unit 340, and the output end of the voltage stabilizing unit 330 is connected to the laser 310; a first input terminal of the control unit 350 is electrically connected to the input terminal of the sampling unit 340, a second input terminal of the control unit 350 is electrically connected to the output terminal of the sampling unit 340, and an output terminal of the control unit 350 is connected to the control terminal of the voltage regulation unit 330.

In some embodiments of the present application, in combination with characteristics of laser 310, the internal resistance may fluctuate during operation of laser 310, and in order to ensure normal operation of laser 310 and reduce power consumption of voltage regulation unit 330 to laser 310, voltage regulation unit 330 generally outputs a voltage of about 1.3V to laser 310 and needs to continuously adjust the magnitude of the actual output voltage according to the internal resistance change of laser 310 to ensure stable bias current input to laser 310, and therefore, the current source circuit includes voltage regulation unit 330 and control unit 350. Further, in order to reduce the power consumption of the voltage stabilizing unit 330, a voltage converting unit 320 is disposed between the power supply pin of the golden finger and the voltage stabilizing unit 330 for reducing the voltage of the input voltage from the power supply pin of the golden finger to the voltage stabilizing unit 330.

In some embodiments of the present application, the voltage regulation unit 330 includes an LDO regulator chip, which is a Low DropOut linear regulator, and is generally called Low DropOut linear regulator; the voltage converting unit 320 includes a DC-DC power supply chip. Therefore, the voltage stabilizing unit 330 including the LDO voltage stabilizing chip and the voltage converting unit 320 including the DC-DC power supply chip can ensure that the voltage supplied to the laser 310 has low noise, which further facilitates ensuring that the laser 310 operates normally.

Further, the voltage regulation unit 330 includes an LDO voltage regulation chip and a matching resistor, which match to regulate the output voltage according to the control of the control unit 350 so as to stabilize the bias current input to the laser 310; the voltage conversion unit 320 includes a DC-DC power chip and a matching resistor, and is used for performing voltage reduction conversion from the power supply pin of the finger to the voltage stabilizing unit 330, for example, reducing the voltage of 3.3V to 1.8V. Since the LDO regulator chip has a power consumption of a voltage difference between an input voltage and an output voltage × an output current, the voltage of the power supply pin passing through the gold finger is first converted by the voltage conversion unit 320 to be reduced, so that the power consumption of the LDO regulator chip is reduced.

In some embodiments of the present application, the sampling unit 340 includes a sampling resistor, and in order to save power consumption of the sampling resistor, the sampling resistor is usually a resistor with a relatively small resistance, such as 0.1 Ω. The control unit 350 includes an MCU, which obtains the sampling value of the current input from the voltage regulator unit 330 to the laser 310 through the sampling unit 340 and inputs control feedback to the voltage regulator unit 330 to adjust the output voltage of the voltage regulator unit 330 to make the stabilized current output to the laser 310. Further, the control accuracy of the control unit 350 is ensured, the control unit 350 further includes an amplifier, the amplifier is used for amplifying the sampling value, the control unit 350 is ensured to obtain the accuracy of the sampling value, and the MCU is further convenient to control the voltage stabilizing unit 330 in combination with the amplified sampling value.

Fig. 7 is a schematic diagram of a current source circuit according to some embodiments, and fig. 7 shows a detailed structural diagram of a power supply circuit. As shown in fig. 7, the voltage conversion unit 320 includes a DC-DC power chip 321, a first resistor 322, a second resistor 323, and a third resistor 324, and the first resistor 322, the second resistor 323, and the third resistor 324 are combined to adjust the output voltage of the DC-DC power chip 321. The method comprises the following steps: one end of the first resistor 322 is connected to an output voltage feedback pin of the DC-DC power supply chip 321, and the other end of the first resistor 322 is grounded; one end of the second resistor 323 is connected to an output voltage feedback pin of the DC-DC power chip 321, the other end of the second resistor 323 is connected to one end of the third resistor 324, the other end of the third resistor 324 is connected to an output pin of the DC-DC power chip 321, the output pin of the DC-DC power chip 321 is used as an output end of the voltage conversion unit 320, and an input pin of the DC-DC power chip 321 is connected to a power supply pin of the gold finger. In the embodiment, the first resistor 322, the second resistor 323 and the third resistor 324 are combined to adjust the magnitude of the output voltage of the DC-DC power chip 321, so that the debugging of the output voltage of the DC-DC power chip 321 by adjusting the resistance value of the resistors is facilitated.

In some embodiments, the voltage conversion unit 320 further includes a first capacitor 325, one end of the first capacitor 325 is connected between the input pin of the DC-DC power chip 321 and the power supply pin of the gold finger, the other end of the first capacitor 325 is grounded, and the first capacitor 325 is configured to filter noise in the input voltage of the input pin of the DC-DC power chip 321, that is, perform filtering processing on the input power of the DC-DC power chip 321, and reduce noise and interference of the input power of the DC-DC power chip 321.

In some embodiments, the voltage converting unit 320 further includes a second capacitor 326 and a first inductor 327; one end of the second capacitor 326 is connected to the output pin of the DC-DC power chip 321, and the other end of the second capacitor 326 is grounded; the first inductor 327 is connected in series between an output pin of the DC-DC power supply chip 321 and an input terminal of the voltage stabilizing unit 430. The second capacitor 326 and the first inductor 327 are used in combination for voltage regulation and current limiting.

As shown in fig. 7, the voltage regulation unit 330 includes an LDO voltage regulation chip 331, a fourth resistor 332, a fifth resistor 333, and a sixth resistor 334, where the fourth resistor 332, the fifth resistor 333, and the sixth resistor 334 are combined to adjust the magnitude of the output voltage of the LDO voltage regulation chip 331. The method comprises the following steps: one end of the fourth resistor 332 is grounded, the other end of the fourth resistor 332 is connected with one end of the fifth resistor 333, the other end of the fifth resistor 333 is connected with an output voltage feedback pin of the LDO voltage regulation chip 331, one end of the sixth resistor 334 is connected with the output voltage feedback pin of the LDO voltage regulation chip 331, the other end of the sixth resistor 334 is connected with the output pin of the LDO voltage regulation chip 331, the output voltage feedback pin of the LDO voltage regulation chip 331 is further connected with the control end of the voltage regulation unit 330, and the input pin of the LDO voltage regulation chip 331 is connected with the output end of the voltage conversion unit 320. In some embodiments, the input pin of the LDO regulator chip 331 is connected to the other end of the first inductor 327.

In some embodiments, the voltage regulation unit 330 further includes a third capacitor 335, one end of the third capacitor 335 is connected between the input pin of the LDO voltage regulation chip 331 and the voltage conversion unit 320, the other end of the third capacitor 335 is grounded, and the third capacitor 335 is used for filtering noise in the input voltage at the input pin of the LDO voltage regulation chip 331.

In some embodiments, the voltage regulation unit 330 further includes a fourth capacitor 336, one end of the fourth capacitor 336 is grounded, and the other end of the fourth capacitor 336 is connected between the output pin of the LDO voltage regulation chip 331 and the input terminal of the sampling unit 340, so as to reduce noise and interference in the output voltage of the LDO voltage regulation chip 331, and further ensure stability of the input current to the sampling unit 340.

As shown in fig. 7, the sampling unit 340 includes a sampling resistor 341, one end of the sampling resistor 341 is connected to the output terminal of the voltage stabilizing unit 330, and the other end of the sampling resistor 341 is connected to the laser 310. Illustratively, the resistance of the sampling resistor 341 is 0.1 Ω but not limited to 0.1 Ω, which facilitates reducing the power consumption of the sampling resistor 341.

In some embodiments of the present application, since the resistance value of the sampling resistor 341 is relatively small, and further, the voltage drop generated at two ends of the sampling resistor 341 is relatively small, so that in order to facilitate the control unit 350 to obtain the voltage drop, as shown in fig. 7, the control unit 350 includes the MCU351 and the differential amplifier 352, the first input end of the differential amplifier 352 is connected to one end of the sampling resistor 341, the second input end of the differential amplifier 352 is connected to the other end of the sampling resistor 341, the output end of the differential amplifier 352 is connected to the input end of the MCU351, and further, the voltage drop at two ends of the sampling resistor 341 is amplified by the differential amplifier 352, which is convenient for the MCU351 to obtain sampling information, so as to ensure that the MCU351 accurately controls the voltage stabilizing unit 330.

In some embodiments of the present application, the MCU351 uses PID control, and the voltage regulation unit 330 continuously adjusts the output voltage value according to the PID control signal of the MCU351, so that the current input to the laser 310 by the voltage regulation unit 330 is constant. Illustratively, the target current is set in the MCU351, the MCU351 monitors and obtains the actual current input by the voltage stabilizing unit 330 to the laser 310, compares the actual current with the target current, and then adjusts the output voltage of the voltage stabilizing unit 330 through PID control to make the voltage output by the voltage stabilizing unit 330 within 1.3 ± 0.3V, so that the current input by the voltage stabilizing unit 330 to the laser 310 tends to be stable, i.e. tends to the target current.

In some embodiments, the control unit 350 further includes a seventh resistor 353, one end of the seventh resistor 353 is connected to the output voltage feedback pin of the LDO regulator chip 331, and the other end of the seventh resistor 353 is connected to the output end of the MCU 351. The seventh resistor 353 generally samples a resistor with a relatively large resistance value so as to limit the current and reduce the power consumption. Illustratively, the resistance of the seventh resistor 353 is 100K Ω.

The optical module provided by the embodiment of the application realizes the function of a current source chip by adopting the current source circuit comprising the voltage conversion unit 320, the voltage stabilizing unit 330, the sampling unit 340 and the control unit 350, so as to reduce the product cost and realize the stable work of the laser 310; meanwhile, the low power consumption performance of the product can be ensured, and the noise is basically consistent with that of a chip using a current source.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; 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 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 in the embodiments of the present application.

Claims

1. A light module, comprising:

a circuit board provided with a current source circuit;

wherein the current source circuit includes:

2. The optical module according to claim 1, wherein the voltage conversion unit includes a DC-DC power supply chip, a first resistor, a second resistor, and a third resistor; one end of the first resistor is connected with an output voltage feedback pin of the DC-DC power supply chip, the other end of the first resistor is grounded, one end of the second resistor is connected with the output voltage feedback pin of the DC-DC power supply chip, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is connected with the output end of the voltage conversion unit, the output pin of the DC-DC power supply chip is connected with the output end of the voltage conversion unit, and the input pin of the DC-DC power supply chip is connected with a power supply pin of the golden finger.

3. The optical module of claim 1, wherein the voltage regulation unit comprises an LDO voltage regulation chip, a fourth resistor, a fifth resistor, and a sixth resistor; one end of the fourth resistor is grounded, the other end of the fourth resistor is connected with one end of the fifth resistor, one end of the fifth resistor is connected with an output voltage feedback pin of the LDO voltage stabilizing chip, one end of the sixth resistor is connected with the output voltage feedback pin of the LDO voltage stabilizing chip, the other end of the sixth resistor is connected with the output pin of the LDO voltage stabilizing chip, the output voltage feedback pin of the LDO voltage stabilizing chip is connected with the control end of the voltage stabilizing unit, and the input pin of the LDO voltage stabilizing chip is connected with the output end of the voltage conversion unit.

4. The light module of claim 1, wherein the control unit comprises a differential amplifier and an MCU; the first input end of the differential amplifier is connected with the input end of the sampling unit, the second input end of the differential amplifier is connected with the output end of the sampling unit, the output end of the differential amplifier is connected with the input end of the MCU, and the output end of the MCU is connected with the control end of the voltage stabilizing unit.

5. The optical module according to claim 1, wherein the sampling unit comprises a sampling resistor, one end of the sampling resistor is connected to the output end of the voltage stabilizing unit, and the other end of the sampling resistor is connected to the laser.

6. The light module of claim 2, wherein the voltage conversion unit further comprises a first capacitor, a second capacitor, and a first inductor; one end of the first capacitor is grounded, and the other end of the first capacitor is connected between the DC-DC power supply chip and the power supply pin of the golden finger; the first inductor is connected between an output pin of the DC-DC power supply chip and an input end of the voltage stabilizing unit in series; one end of the second capacitor is grounded, and the other end of the second capacitor is connected with an output pin of the DC-DC power supply chip.

7. The optical module according to claim 3, wherein the voltage regulation unit further comprises a third capacitor and a fourth capacitor; one end of the third capacitor is grounded, and the other end of the third capacitor is connected between an input pin of the LDO voltage stabilizing chip and the output end of the voltage conversion unit; one end of the fourth capacitor is grounded, and the other end of the fourth capacitor is connected between an output pin of the LDO voltage stabilizing chip and the input end of the sampling unit.

8. The optical module according to claim 4, wherein the control unit further comprises a seventh resistor, one end of the seventh resistor is connected to the control end of the voltage stabilizing unit, and the other end of the seventh resistor is connected to the output end of the MCU.

9. The optical module according to claim 1, wherein the output voltage of the voltage converting unit is 1.8V, and the voltage output by the voltage stabilizing unit is 1.3 ± 0.3V.

10. The optical module according to claim 5, characterized in that the resistance value of the sampling resistor is 0.1 Ω.