CN113541804A

CN113541804A - Optical module

Info

Publication number: CN113541804A
Application number: CN202010304611.0A
Authority: CN
Inventors: 杨世海; 杨柳; 张强; 赵其圣
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-10-22
Anticipated expiration: 2040-04-17
Also published as: CN113541804B

Abstract

The application provides an optical module, including: a circuit board; the light emitting component is electrically connected with the circuit board and used for generating signal light; the MCU is arranged on the circuit board and used for outputting an enabling control signal; the direct current driving current source is arranged on the circuit board and outputs direct current driving current; the circuit comprises a circuit board, an enabling circuit, a first input end, a second input end and a switching output end, wherein the circuit board is provided with a first input end and a second input end; the light emitting module includes: the laser emits light which does not carry signals when the anode receives the direct current driving current; and the electric absorption modulator modulates and processes the light without carrying the signal according to the electric absorption modulation signal to obtain signal light. The light emitting module and the control method thereof realize the on and off of the light emitting module through the enabling circuit, realize the rapid on and off of the optical module, and meet the time requirements of an optical module protocol on the on time being less than 1mS and the off time being less than 10 uS.

Description

Optical module

Technical Field

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

Background

The optical communication technology can be applied to novel services and application modes such as cloud computing, mobile internet, video and the like. In optical communication, an optical module is a tool for realizing the interconversion of optical signals and is one of the key devices in optical communication equipment. With the rapid development of the 5G network, the optical module at the core position of optical communication has been developed greatly. For the signal transmission of the optical module, VCSEL (Vertical Cavity Emitting Laser), EML (electro-absorption Modulated Laser) and other types of signal transmission modes can be adopted.

However, as the transmission rate increases, the influence of the power supply noise on the high-frequency signal becomes more and more obvious, so that a low-noise power supply, such as a dc driving current source, is usually directly disposed on the driving circuit of the laser to reduce the influence of the power supply noise on the high-frequency signal. However, the low-noise power supply is difficult to design and expensive to manufacture on the driving circuit in the high-rate EML, so the low-noise power supply is usually not included in the driving circuit in the high-rate EML, and a separate low-noise power supply needs to be designed and connected for driving when the EML is used specifically. The direct current driving current of the EML needs to be regulated in the design process, and the time requirements of the protocol for the turn-on time being less than 1mS and the turn-off time being less than 10uS are also met on the premise of meeting the light-emitting work.

Disclosure of Invention

The embodiment of the application provides an optical module which is used for realizing the rapid on and off of a laser.

The application provides an optical module, includes:

a circuit board;

the light emitting component is electrically connected with the circuit board and used for generating signal light;

the MCU is arranged on the circuit board and used for outputting an enabling control signal;

the direct current driving current source is arranged on the circuit board and outputs direct current driving current;

the laser driver is arranged on the circuit board, is connected with the MCU and is used for outputting an electric absorption modulation signal;

the light emitting assembly includes:

the laser comprises an anode, a cathode and a laser, wherein the anode is used for receiving the direct current driving current, the cathode is connected with a grounding end of an electric wire, and when the anode receives the direct current driving current, light which does not carry signals is emitted;

the electric absorption modulator is connected with the laser driver and modulates and processes the light without carrying signals according to the electric absorption modulation signals to obtain signal light;

the light module further includes:

the enabling circuit is arranged on the circuit board, the first input end receives the enabling control signal, the second input end receives the direct current driving current, the first output end is connected with the power consumption element, the second output end is connected with the anode of the laser, and the power consumption element or the laser receives the direct current driving signal based on the received enabling control signal output switching.

The application provides an optical module, including circuit board, light-emitting component, MCU, direct current drive current source, enabling circuit and power consumptive element. The first input end of the enabling circuit is connected with the MCU, the second input end of the enabling circuit is connected with the direct current driving current source, the first input end is used for receiving enabling control signals sent by the MCU, the second input end is used for receiving direct current driving current output by the direct current driving current source, the first output end is connected with the power consumption element, the second output end is connected with the laser, the enabling circuit is controlled by the MCU to carry out output switching, and the direct current driving current flows to the power consumption element or the laser. When the enabling circuit inputs the direct current driving current output by the direct current driving current source to the optical laser, the laser is started, the laser emits light and generates signal light under the modulation action of the electro-absorption modulator, and then the light emitting component is started to emit light; when the enabling circuit inputs the direct current driving current output by the direct current driving current source to the power consumption element, the laser is turned off, the laser in the light emitting assembly stops emitting light, and then the light emitting assembly is turned off in the light emitting operation.

Therefore, the optical module provided by the application realizes the on and off of the light emitting operation of the light emitting module through the enabling circuit, and the direct current driving current source is in the non-off state, and the time for switching the on direction of the signal control enabling circuit is uS level, so that the light emitting operation of the light emitting module in the optical module is quickly turned on and off, and the time requirements of an optical module protocol on the on time being less than 1mS and the off time being less than 10uS are met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention, and it is obvious for those skilled in the art that other drawings can be obtained according to 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 a schematic diagram of an exploded structure of an optical module according to an embodiment of the present application;

fig. 5 is a schematic diagram of an internal structure of an optical module according to an embodiment of the present disclosure;

fig. 6 is a block diagram of an internal structure of an optical module according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of an internal circuit of an optical module according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.

One of the core links of optical communication is the interconversion of optical and electrical signals. Optical communication uses optical signals carrying information to transmit in information transmission equipment such as optical fiber/optical waveguide, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fiber/optical waveguide; 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, and fig. 4 is an exploded structural diagram of the optical module 200 according to an embodiment of the present disclosure. As shown in fig. 3 and 4, an optical module 200 provided in an embodiment of the present application includes an upper housing 201, a lower housing 202, a circuit board 203, an unlocking handle 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 can be two ends (208, 209) in the same direction, or two openings in different directions; one opening is an electric port 208, and a gold finger of the circuit board extends out of the electric port 208 and is inserted into an upper computer such as an optical network unit; the other opening is an optical port 209 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 a circuit board 203, a light emitting assembly 205, and a 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 203, the light emitting assembly 205, the light receiving assembly 206 and other devices can be conveniently installed in the shells, 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 204 is located on the outer wall of the wrapping cavity/lower housing 202, and is 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 204 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 optical transmitter 205 and the optical receiver 206 are respectively used for transmitting and receiving 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 circuit board 203 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes and MOS transistors) and chips (such as a microprocessor MCU, a laser driver chip, a limiting amplifier, a clock data recovery CDR, a power management chip, and a data processing chip DSP).

The circuit board 203 connects the electrical appliances in the optical module together according to the circuit design through circuit wiring to realize the electrical functions of power supply, electrical signal transmission, grounding and the like.

The circuit board 203 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.

Fig. 5 is a schematic view of an internal structure of an optical module according to an embodiment of the present application. As shown in fig. 5, the circuit board 203 in the optical module is provided with an MCU301, a laser driver 302, a direct current drive current source 303, and an enable circuit 304. The light emitting module 205 and the light receiving module 206 are connected to the circuit board 203 through a flexible circuit board.

The MCU301 is connected to the laser driver 302, and the MCU301 is also connected to the enable circuit 304, where the MCU301 is configured to output control signals to the laser driver 302 and the enable circuit 304, for example, the MCU301 outputs an enable control signal to the enable circuit 304. The dc driving current source 303 is used for outputting a dc driving current to provide the dc driving current for the optical emitting component 205 to generate the optical signal. The enable circuit 304 includes a first input and a second input for receiving an enable control signal and a dc drive current.

Specifically, the method comprises the following steps: a first input end of the enabling circuit 304 is connected with the MCU301, and the enabling circuit 304 receives an enabling control signal output by the MCU301 through a first input end thereof; a second input terminal of the enable circuit 304 is connected to the dc driving current source 303, and the enable circuit 304 receives the dc driving current output by the dc driving current source 303 through a second input terminal thereof. The output terminal of the enable circuit 304 is connected to the optical transmitter 205, and the enable circuit 304 controls whether to output the dc driving current to the optical transmitter 205 according to the received enable control signal. When the dc driving current is outputted to the light emitting device 205, the light emitting device 205 is turned on, and when the dc driving current is not outputted to the light emitting device 205, the light emitting device 205 is turned off, thereby controlling the on/off of the light emitting device 205.

Specifically, the method comprises the following steps: when the enable circuit 304 receives an enable control signal for outputting the dc driving current to the light emitting device 205, the enable circuit 304 outputs the dc driving current to the light emitting device 205 according to the received enable control signal, and the light emitting device 205 receives the dc driving current, so as to turn on the light emitting device; when the enable circuit 304 receives an enable control signal that does not output the dc driving current to the light emitting device 205, the enable circuit 304 does not output the dc driving current to the light emitting device 205 according to the received enable control signal, and the light emitting device 205 does not receive the dc driving current, so that the light emitting device 205 is turned off.

Wherein, the laser driver 302 and the enabling circuit 304 are respectively connected with the light emitting component 205. The laser driver 302 and the enabling circuit 304 cooperate to enable the optical transmit assembly 205 to generate signal light.

Optionally, the enable control signal output by the MCU301 is at a low level, and the enable circuit 304 enables the dc driving current to be input to the light emitting element 205 according to the enable control signal at the low level state; the enable control signal output by the MCU301 is at a high level, and the enable circuit 304 disables the dc driving current from being input to the light emitting element 205, for example, to a power consuming device, according to the enable control signal in the high level state.

Fig. 6 is a block diagram of an internal structure of an optical module according to an embodiment of the present application. As shown in fig. 6, the light emitting module 205 provided in the embodiment of the present application is provided with a laser and an Electro Absorption Modulator (EAM). In addition, a Thermo Electric Cooler (TEC) or the like for controlling the temperature of the laser and the electro absorption modulator may be provided.

The output of the laser driver 302 is connected to the EAM in the optical transmit module 205 and the output of the enable circuit 304 is connected to the laser in the optical transmit module 205. The laser receives light which is sent by direct current driving current and does not carry signals, the laser driver 302 drives electro-absorption modulation to modulate the light which does not carry signals into signal light according to the electro-absorption modulation signals, and then the laser driver 302 and the enabling circuit 304 cooperate to enable the laser and the EAM to cooperate to generate the signal light.

Furthermore, when the enable circuit 304 receives an enable control signal for outputting a dc driving current to the light emitting device 205, the enable circuit 304 outputs a dc driving current to the laser according to the received enable control signal, and the laser receives the dc driving current, so as to start the light emitting device; when the enable circuit 304 receives an enable control signal that does not output a dc driving current to the light emitting device 205, the enable circuit 304 does not output a dc driving current to the laser according to the received enable control signal, and the laser does not receive the dc driving current, thereby turning off the light emitting device 205.

Optionally, the enabling circuit 304 includes a first output terminal or a second output terminal, the first output terminal is idle or connected to the power consuming element 305, and the second output terminal is connected to the laser. Further, when the enable circuit 304 enables the control signal to conduct the second output terminal, the direct current driving current flows to the laser, and the laser is turned on to emit light; when the enable circuit 304 enables the control signal to turn on the second output terminal, the dc driving current flows to the power consuming element 305, and the laser is turned off.

In the optical module provided in the embodiment of the present application, the dc driving current source 303 is in a non-turn-off state, that is, the output of the dc driving current source 303 is kept in a non-turn-off state, the MCU301 outputs the enable control signal to control the enable circuit 304 to transmit the dc driving current to the laser in the light emitting module 205, so that the enable circuit realizes turning on and off of the light emitting module 205. In the embodiment of the present application, no dc driving current is needed during the on and off process of the light emitting device 205, so as to save the time for turning on and off the dc driving current. The time for controlling the enabling circuit to be turned on or off by the enabling control signal is uS-level, so that in the embodiment of the application, the uS-level time control of the on and off of the light emitting operation of the light emitting component 205 is realized by the enabling circuit 304, and the requirements of an optical module protocol on the time that the on time is less than 1mS and the off time is less than 10uS are met.

Optionally, the enabling circuit comprises an analog switch. The first input end of the analog switch is connected with the MCU and receives an enabling control signal output by the MCU; the second input end of the analog switch is connected with the direct current driving current source and receives the direct current driving current output by the direct current driving current source; the output end of the analog switch is connected with the light emitting component. The analog switch controls the on or off of the analog switch according to the received enabling control signal to realize the control of whether the direct current driving current is transmitted to the light emitting component or not. If the enable control signal output by the MCU is at a low level, the analog switch is switched on, so that the direct current drive current is input to the light emitting component; the enable control signal output by the MCU is high level, and the analog switch is switched off, so that the direct current drive current is not input to the light emitting component. Further, in the optical module provided in the embodiment of the present application, the on/off control of the light emitting operation of the light emitting element 205 is realized by an analog switch.

Further, in the embodiment of the present application, the analog switch included in the enabling circuit is a single-pole double-throw analog switch, that is, the analog switch includes two output terminals. The first input end of the single-pole double-throw analog switch is connected with the MCU and receives an enabling control signal output by the MCU; the second input end of the single-pole double-throw analog switch is connected with a direct current driving current source and receives direct current driving current output by the direct current driving current source; the first output end of the single-pole double-throw analog switch is in no-load or connected with a power consumption device, and the second output end of the single-pole double-throw analog switch is connected with the light emitting component. The single-pole double-throw analog switch controls the opening or closing direction of the single-pole double-throw analog switch according to the received enabling control signal, and further realizes the control of whether to transmit direct current driving current to the light emission component. If the enable control signal output by the MCU is low level, the direction of the first output end of the single-pole double-throw analog switch is switched off, and the direction of the second output end of the single-pole double-throw analog switch is switched on, so that the direct current drive current is input to the light emitting component; the enable control signal output by the MCU is high level, the direction of the first output end of the single-pole double-throw analog switch is conducted, and the direction of the second output end of the single-pole double-throw analog switch is switched off, so that the direct current drive current is not input to the light emitting component.

In the embodiment of the application, the input end of the power consumption device is connected with the first output end of the single-pole double-throw analog switch, and the output end of the power consumption device is connected with the grounding end of the wire. The power consuming device may be a diode or a resistor, etc., the current carrying capacity of the diode and resistor being no lower than the current carrying capacity of the laser in the light emitting assembly. Optionally, the diode or resistor has the ability to carry the same current as the laser. In turn, during the on and off process of the light emitting component, the overshoot of the direct current driving current output by the direct current driving current source 303 is avoided through a diode or a resistor, and the failure of the laser caused by the overshoot of the direct current driving current can be effectively avoided.

In the embodiment of the application, the MCU can be controlled by software of the upper computer, for example, the upper computer communicates with the MCU through an I2C pin of a golden finger to send a laser turn-off or turn-on instruction to the MCU; or the system sends a voltage type enabling signal instruction to the MCU through the Tx-Disable pin of the golden finger to turn off or turn on the laser. For example, the upper computer sends a high-low level voltage type instruction to the MCU through the Tx-Disable pin of the golden finger to turn off or turn on the laser, wherein the high level is used for turning off the laser, and the low level is used for turning on the laser. Or the upper computer sends an enable signal to the MCU, the enable signal is used for enabling the MCU to output an enable control signal, the MCU receives the enable signal sent by the upper computer, and the enable control signal is sent to the enable circuit according to the enable signal.

Optionally, the MCU outputs the enable control signal according to a received laser turn-off or turn-on command issued by the upper computer. If the MCU receives a laser starting instruction, outputting an enabling control signal in a low level state according to the software starting instruction; and if the MCU receives a laser turn-off instruction, outputting an enable control signal in a high level state according to the software turn-off instruction.

Optionally, the MCU sends a voltage type enable signal instruction to the MCU according to the received Tx-Disable pin of the upper computer through the gold finger to output an enable control signal. If the upper computer sends an enable signal to the MCU to be in a low level, the MCU outputs an enable control signal in a low level state according to the received enable signal; and if the upper computer sends an enabling signal to the MCU to be in a high level, the MCU outputs an enabling control signal in a high level state according to the received enabling signal.

Fig. 7 is a schematic diagram of an internal circuit of an optical module according to an embodiment of the present application, and fig. 7 shows a schematic circuit of driving on and off of a laser LD. As shown in fig. 7, in the embodiment of the present application, the enabling circuit 304 includes a single-pole double-throw analog switch 3041, and the power consuming element 305 includes a diode 3051. A first input end of the single-pole double-throw analog switch 3041 is connected to the MCU301, and receives an enable control signal output by the MCU 301; a second input end of the single-pole double-throw analog switch 3041 is connected to the dc driving current source 303, and receives the dc driving current output by the dc driving current source; the first output end a of the single-pole double-throw analog switch 3041 is connected with a diode 3051; the second output terminal b of the single-pole double-throw analog switch 3041 is connected to the laser LD in the light emitting module 205. The anode of the diode 3051 is connected to the first output end a of the single-pole double-throw analog switch 3041, and the cathode of the diode 3051 is connected to the ground terminal of the wire.

The single-pole double-throw analog switch 3041 controls the flow direction of the dc drive current output from the dc drive current source 303 in accordance with the enable control signal received from the MCU 301. When the single-pole double-throw analog switch 3041 turns on the direction of the first output end a, the direct current drives the current to flow to the diode 3051; when the spdt 3041 turns on the second output terminal b, the dc driving current flows to the laser LD. Therefore, in the embodiment of the present application, the MCU301 controls the output enable control signal to control the conduction direction of the single-pole double-throw analog switch 3041, so as to control the on/off of the laser LD in the optical transmission assembly 205. The diode 3051 and the laser LD have the same current carrying capability, which is helpful for preventing the dc driving current output by the dc driving current source 303 from overshooting, and further effectively preventing the laser LD from failing due to the overshooting.

Optionally, when the MCU301 outputs an enable control signal in a low level state, the single-pole double-throw analog switch 3041 turns on the direction of the second output end b, the dc driving current flows to the laser LD, and the laser LD is driven to turn on. Preferably, when the MCU301 outputs an enable control signal in a high level state, the spdt 3041 turns on the first output terminal a, the dc driving current flows to the diode 3051, and the laser LD is driven to turn off.

Further, in the present embodiment, the diode 3051 may be replaced by a resistor having the same current carrying capacity, but is not limited to the resistor.

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

1. A light module, comprising:

a circuit board;

the light emitting assembly includes:

the light module further includes:

the enabling circuit is arranged on the circuit board, a first input end is connected with the MCU and used for receiving the enabling control signal, a second input end is connected with the direct current driving current source and used for receiving the direct current driving current, a first output end is connected with the power consumption element, a second output end is connected with the anode of the laser, and the power consumption element or the laser receives the direct current driving signal based on the received enabling control signal output switching.

2. The optical module of claim 1, wherein the enabling circuit comprises a single pole double throw analog switch;

a first input end of the single-pole double-throw analog switch receives the enabling control signal, and a second input end of the single-pole double-throw analog switch receives the direct current driving current;

the first output end of the single-pole double-throw analog switch is connected with the power consumption element, the second output end of the single-pole double-throw analog switch is connected with the laser, and the first output end and the second output end are conducted based on the enabling control signal to switch so that the power consumption element or the laser receives the direct current driving signal.

3. The optical module according to claim 1, wherein the dc driving current source keeps outputting all the time during the output switching process of the enable circuit based on the received enable control signal.

4. A light module as claimed in claim 1, characterized in that the input of the power consuming device is connected to the first output, and the output of the power consuming device is connected to a wire ground.

5. A light module as claimed in claim 2, characterized in that the power consuming device has the same current carrying capacity as the laser.

6. A light module as claimed in claim 1, characterized in that the power consuming device comprises a diode or a resistor.

7. The optical module according to claim 1, wherein if the enable control signal output by the MCU is at a low level, the dc driving current output by the enable circuit is input to the laser;

and if the enable control signal output by the MCU is at a high level, the direct current drive current output by the enable circuit is input to the power consumption element.

8. The optical module of claim 2, wherein if the enable control signal outputted from the MCU is low, the spdt analog switch is turned on to the second output terminal;

and if the enable control signal output by the MCU is high level, the single-pole double-throw analog switch is conducted to the first output end.

9. The optical module according to claim 7 or 8, wherein the MCU receives an enable signal of the upper computer; if the received enabling signal of the upper computer is at a high level, the enabling control signal output by the MCU is at the high level;

and if the received enabling signal of the upper computer is at a low level, the enabling control signal output by the MCU is at a low level.

10. The optical module according to claim 7 or 8, wherein the MCU outputs an enable control signal according to the received laser turn-on command and laser turn-off command;

if the MCU receives a laser starting instruction, enabling control signals output by the MCU are low level;

and if the MCU receives a laser turn-off instruction, enabling a control signal output by the MCU is in a high level.