CN208581235U - A kind of optical module for local loopback test - Google Patents

Abstract

The utility model discloses a kind of optical modules for local loopback test, the test application environment under the conditions of different power consumption can be simulated, real-time and accurately acquire feedback-related information, suitable for the network equipment under the conditions of a variety of different modulating types and rate and different link attenuations, the testing time is shortened while improving measuring accuracy and accuracy rate and reduces testing cost.The optical module includes: multiple interfaces, attenuator circuit ATT, CDR module, micro-control unit MCU, multipath control switch and the multiple load resistance encapsulated according to preset protocol；Wherein, MCU is used to be arranged according to preset protocol the initialization modulating mode and level of power consumption of optical module, and control CDR module uses PAM-4 modulating mode or NRZ modulating mode, and switches the rate of each signaling interface according to modulating mode；And the corresponding load power consumption value of setting is controlled, and control the network mapping that CDR module is established between input/output signal interface.

Description

A kind of optical module for local loopback test

Technical field

The utility model relates to technical field of optical fiber communication, more particularly to one kind is for local loopback Loopback (this paper Middle Loopback refers in particular to local loopback) test optical module.

Background technique

In recent years, with the rapid development of mobile communication technology, the 5th third-generation mobile communication technology " 5G " will progress into me Life, as the carrier of 5G communication system, the network equipments such as high rate optical module and corresponding router, interchanger can be big Amount uses.Conventional network equipment carries out signal transmission and interaction mostly uses nonreturn to zero code NRZ mode to be modulated greatly, that is, uses two Signal level is planted to indicate 0,1 information of digital logic signal, each symbol period can transmit the logical message of 1 bit；And arteries and veins Rushing amplitude modulation PAM signal then can be using more signal level, so that each symbol period can transmit more bit information.With For PAM-4 signal, 4 different signal levels are used to carry out signal transmission, each symbol period can indicate 2 The logical message (0,1,2,3) of bit.Therefore, same signal transmission capabilities to be realized, the character rate of PAM-4 signal only needs Reach the half of NRZ signal, therefore transmission channel is lost caused by it and will greatly reduce.

In the formulation process of high rate optical module interface standard, most basic demand is the data speed in each pair of high-speed line Rate will be increased to 50Gbps or more, if still using NRZ modulation technique, each symbol period is only less than 20ps, for transmitting-receiving Hold chip time margin and transmission link loss require it is harsher, so PAM-4 modulation technique use almost at For inexorable trend.However, conventional high rate rate network communication equipment can hardly support PAM-4 modulating mode；Existing test side Formula must also be using optical module, optical fiber, optical attenuation or amplifier and other test cable test system building (i.e. non-local rings Return), not only testing cost is expensive, testing efficiency is low for which, and also takes up a large amount of test resource, it is difficult to carry out online High/low temperature, system level testing etc..

Existing market does not support the Loopback of NRZ/PAM-4 modulating mode to test optical module simultaneously, has QSFP28Loopback test optical module is that 4 road NRZ signals are carried out loopback, each channel highest loopback speed by ce circuit Rate is only 28Gbps.Existing QSFP28Loopback test optical module does not support PAM-4 etc. using NRZ modulating mode Debugging mode and its corresponding speed are expanded, and in addition every QSFP28Loopback test optical module only corresponds to a kind of level of power consumption, As there is the testing requirement of different power consumption grade at the end Host, it is necessary to which the Loopback module for customizing a variety of different power consumptions is surveyed Examination, not only increases testing cost, but also bring inconvenience to test job.

Different attitudes are held to the developing direction of the following high-speed module by major network carrier, the world at present, and some thinks QSFP-DD series of high speed rate optical module will become main product, also it is believed that OSFP or CFP series of high speed rate optical module will be led Lead market trend；For next-generation high rate optical module development trend, when not yet reaching an agreement all over the world, QSFP-DD, OSFP, CFP series optical module will rise and develop simultaneously；The Loopback of existing single type tests optical module It will be unable to cover the application of most of Host end switch.

Utility model content

One of the purpose of this utility model at least that, for how to overcome the above-mentioned problems of the prior art, provide A kind of optical module for local loopback test, can simulate the test application environment under the conditions of different power consumption, real-time and accurately Feedback-related information is acquired, suitable for the network equipment under the conditions of a variety of different modulating types and rate and different link attenuation, The testing time is shortened while improving measuring accuracy and accuracy rate and reduces testing cost.

To achieve the goals above, the technical solution adopted in the utility model includes following aspects.

A kind of optical module for local loopback test comprising: according to multiple interfaces of preset protocol encapsulation, decaying electricity Road ATT, CDR module, micro-control unit MCU, multipath control switch and multiple load resistances；

Wherein, it is connected according to multiple interfaces of preset protocol encapsulation for interface corresponding with tested host equipment It connects comprising multiple input signal interfaces for from host equipment received data packet, it is multiple for number to occur to host equipment According to the output signal interface of packet, six power interfaces for powering to optical module, including data line SDA and clock cable The I2C bus interface of SCL and the control of multiple states and instruction interface；Each input signal interface and output signal interface are equal Interface can be switched in the rate for being set as single channel 25Gbps or 50Gbps；Input signal interface is connected to via attenuator circuit ATT CDR module；

MCU is used to be arranged according to preset protocol the initialization modulating mode and level of power consumption of optical module；MCU passes through I2C Bus interface connect to instruct and send diagnostic message to receive the loopback test from host equipment with host equipment and set to host It is standby, it is connect by MDIO/MDC bus interface with CDR module, and connect by GPIO interface with multipath control switch；MCU is into one Walk for according to loopback test instruct in information controlled by the register that MDIO/MDC bus interface is arranged in CDR module CDR module carries out signal modulation using PAM-4 modulating mode or NRZ modulating mode, and each defeated according to modulating mode switching Enter the rate of signaling interface and output signal interface；

MCU is further used for leading on-off via GPIO interface control multipath control switch according to identified modulating mode One or more of multiple load resistances are opened corresponding load power consumption value is arranged to match corresponding power consumption of preset protocol etc. Grade, and the network between input signal interface and output signal interface is established via MDIO/MDC bus interface control CDR module Mapping.

Preferably, the attenuator circuit ATT includes 8 π type attenuator circuits, each of these is by 4 digital resistors It constitutes, by the combination of different digital resistor, different grades of decaying is carried out to signal.

Preferably, the CDR module includes sequentially connected continuous time linear equalizer CTLE, ce circuit, Yi Jiqian To error correction FEC repeat circuit；

Multiple AC coupled capacitors are connected between the input terminal and output end of CDR module to filter out the direct current in high-frequency signal Component.

Preferably, the optical module further comprises the temperature sensor that MCU is connected to via GPIO interface, voltage acquisition Circuit and multiple status indicator lamps.

Preferably, the MCU is used to obtain the real-time temperature of optical module periodically by temperature sensor, voltage collection circuit Degree and supply voltage, and judge temperature and supply voltage whether within the scope of the job requirement of optical module；When operating temperature and work Make voltage in the normal range when, optical module work normally, MCU state of a control indicator light display work normally information；Work as mould When block operating temperature or supply voltage are more than job requirement range, MCU state of a control indicator light display alarm information, and pass through Control switch inside MCU is cut off the power the power supply that interface is connected, to protect tested host equipment and optical module.

Preferably, the MCU is further used for judging whether to modulate mould using PAM-4 according to loopback test instruction first Formula, if host equipment instruction using PAM-4 modulating mode and identical as initial modulation mode, not switch modulation mode；It goes forward side by side One step judges whether to switch level of power consumption；If host equipment instruction raises or lowers level of power consumption, MCU passes through GPIO interface Control multipath control switch be turned on or off one or more of multiple load resistances be arranged corresponding load power consumption value with Match the instruction level of power consumption in loopback test instruction；Be not required to carry out level of power consumption switching or complete switching after, MCU via MDIO/MDC bus interface control CDR module establishes the network mapping between input signal interface and output signal interface, and controls CDR module processed sends data packet under the driving of PAM-4 modulating mode.

Preferably, if host equipment instruction uses NRZ modulating mode and, MCU not identical as initial modulation mode Modulating mode is switched to NRZ modulating mode by corresponding register in MDIO/MDC bus interface selection CDR module；Into One step, MCU judges whether to switch level of power consumption；If host equipment instruction raises or lowers level of power consumption, correspondence is opened Multichannel loading switch in channel is to match the instruction level of power consumption in loopback test instruction；And establish input signal interface and output letter Network mapping between number interface, control CDR module can send data packet under the driving of NRZ modulating mode.

Preferably, the rate for switching each input signal interface and output signal interface according to modulating mode includes: The rate of each input signal interface and output signal interface is switched to 50Gbps when using PAM-4 modulating mode, is being adopted The rate of each input signal interface and output signal interface is switched to 25Gbps with when NRZ modulating mode.

Preferably, the preset protocol is one of QSFP-DD, CFP, CFP2, CFP4, CFP8, OSFP MSA agreement.

Preferably, the optical module structure part includes pedestal, unlock piece drawstring, spring, PCB component, LED light tube, lid Plate and screw；

Wherein, attenuator circuit ATT, CDR module, micro-control unit MCU, multipath control switch and multiple load resistances It is arranged at PCB component, the golden finger that LED light tube and multiple interfaces are drawn is connected to PCB component；It is provided on pedestal It is caught in the erecting bed of PCB component, and pedestal one end is provided in the circular trough for being caught in LED light tube to be fixed；Bottom The seat screw hole opposite at least four positions are each provided on cover board by corresponding the two to be combined to screw to be fixed.

In conclusion by adopting the above-described technical solution, the utility model at least has the advantages that

By being integrated with while supporting the CDR module of PAM-4 and NRZ modulating mode, different modulating type can be suitable for With the network equipment under the conditions of rate and different link attenuation, standard speed range cover Datacom, Infiniband, All standard applications including Fiber Channel etc.；Accomplish using 1 test module, to be compatible with the purpose of a variety of applications, no Only widened the application environment of Loopback test optical module, also for network device manufacturers save a large amount of testing cost and when Between；

By being QSFP-DD, CFP, CFP2, CFP4, CFP8, OSFP etc. by the light module package of the utility model embodiment Interface type provides complete factory performance test scheme for the end the Host network equipment of corresponding high-speed interface type, for system It makes quotient and eliminates expensive testing expense, reduce system testing difficulty, while also improving testing efficiency；

Circuit is monitored by the way that high-precision temperature detector and operating voltage are arranged in optical module, can real-time and accurately be adopted Collect the internal temperature and module operating voltage and to Host host side feedback-related information of module；

By status indicator lamp, tester can intuitively see working condition locating for module, and combine Host host The monitoring information at end accurately judges whether equipment under test is normal；

By being integrated with the controllable level of power consumption selection function of program, tester can be sent by host by I2C bus Instruction selection different power consumption mode, simulates the test application environment under the conditions of different power consumption.

Detailed description of the invention

Fig. 1 shows the optical module for local loopback test according to the utility model exemplary embodiment.

Fig. 2 shows the optical module courses of work for local loopback test according to the utility model exemplary embodiment Schematic diagram.

Fig. 3 shows the structure point of the optical module for local loopback test according to the utility model exemplary embodiment Solve schematic diagram.

Fig. 4 shows the optical module contour structures for local loopback test according to the utility model exemplary embodiment Schematic diagram.

Specific embodiment

With reference to the accompanying drawings and embodiments, the present invention will be further described in detail, so that the utility model Objects, technical solutions and advantages are more clearly understood.It should be appreciated that specific embodiment described herein is only to explain this reality With novel, it is not used to limit the utility model.

Fig. 1 shows the optical module for local loopback test according to the utility model exemplary embodiment.The implementation The optical module of example specifically includes that multiple interfaces according to preset protocol encapsulation, attenuator circuit ATT, CDR module, micro-control unit MCU, multipath control switch and multiple load resistances.Wherein, the four-way small package that preset protocol can be dual density can warm Plug-in module (QSFP-DD) multi-source agreement (MSA), (eight channels small package hot plug CFP, CFP2, CFP4, CFP8, OSFPMSA Small pluggable SFP) etc., hereafter with the high-speed of QSFP-DD MSA protocol encapsulation in the embodiment not illustrated It is illustrated for Loopback optical module.

Wherein, it is used for and tested host equipment (Host, such as exchange according to multiple interfaces of preset protocol encapsulation The network equipments such as machine, router) corresponding interface is connected；Specifically, including eight are used for from host equipment received data packet Input signal interface (RX1+, RX1- ..., RX8+, RX8-), eight for the output signal of data packet to occur to host equipment Interface (TX1+, TX1- ..., TX8+, TX8-), six (two being shown in figure, other are not shown) to optical module for powering Power interface VCC, I2C bus interface including data line SDA and clock cable SCL and the control of multiple states And instruction interface (including reset control interface Reset_L, malfunction instruction interface Int_L, model selection control interface Modsel_L, low-power consumption mode control interface Lpmode_L, failure insert state indicate interface Modprs_L, wherein suffix " _ L " Indicate that low level is effective)；Power interface VCC passes through slow start circuit and DC-DC conversion circuit to CDR module for power supply respectively, leads to Slow start circuit is crossed to power to MCU and multipath control switch.Each input signal interface and output signal interface are disposed as list Interface can be switched in the rate of channel 25Gbps or 50Gbps.

Input signal interface is connected to CDR module via attenuator circuit ATT, and CDR module includes sequentially connected consecutive hours Between linear equalizer CTLE, ce circuit and forward error correction FEC repeat circuit；Wherein, attenuator circuit ATT may include 8 π Type attenuator circuit, each of these is made of 4 digital resistors, by the combination of different digital resistor, to realize pair High speed signal, which carries out different grades of decaying, (for example, for the optical module of QSFP-DD MSA agreement, will default high frequency attenuation value Be set as 0, i.e., undamped)；Continuous time linear equalizer CTLE is for eliminating or weakening broadband connections time delay bring intersymbol Crosstalk；Ce circuit when being reset, and restores data for extracting clock signal from data packet；Forward error correction FEC repeat circuit is for correcting transmission error code；Be connected between the input terminal and output end of CDR module multiple AC coupled capacitors with Filter out the DC component in high-frequency signal；It can guarantee that high-speed data is passing by being applied in combination for a variety of circuits in CDR module Signal amplitude is undistorted, high-low frequency weight is unattenuated, transmission process does not generate or generates error code less during defeated etc., to protect Card high speed packet can be correctly validated when being transferred to receiving end from transmitting terminal.

MCU is used to be arranged according to preset protocol the initialization modulating mode and level of power consumption of optical module；MCU passes through I2C Bus interface is connect to receive the loopback test from host equipment and instruct and send diagnostic message (for example, light with host equipment The information such as temperature, the operating voltage of module, and protocol format as defined in being encapsulated as SFF-8472MSA etc.) to host equipment, pass through MDIO/MDC bus interface is connect with CDR module, and by GPIO (General Purpose Input Output, it is general defeated Entering/export) interface connect with multipath control switch；MCU be further used for being instructed according to loopback test in information pass through MDIO/ Register in MDC bus interface setting CDR module uses PAM-4 modulating mode or NRZ modulating mode to control CDR module Signal modulation is carried out, and cuts the rate of each input signal interface and output signal interface when using PAM-4 modulating mode It is changed to 50Gbps, is switched to the rate of each input signal interface and output signal interface when using NRZ modulating mode 25Gbps；MCU is further used for leading on-off via GPIO interface control multipath control switch according to identified modulating mode Open multiple load resistances (R1, R2 ... one or more of 8) Rn, such as n are corresponding load power consumption value to be arranged to match The corresponding level of power consumption of preset protocol (for example, eight grades such as 3.5W, 7W, 8W, 9W, 10W, 12W, 14W and > 14W), and pass through Network mapping between input signal interface and output signal interface is established by MDIO/MDC bus interface control CDR module.

Wherein, the register being arranged in CDR module includes: that the N byte length since the address chip register A can be used In selection modulating mode, bandwidth and rate, when needing to be arranged PAM-4 modulating mode by corresponding address in A~address (A+N) Position is configured selection PAM-4 according to register table, while masking NRZ mode；Conversely, when needing to be arranged NRZ modulating mode, PAM-4 corresponding address register is masked, NRZ address register is selected.

In a preferred embodiment, the above-mentioned optical module for local loopback test can also include connecting via GPIO interface Temperature sensor, voltage collection circuit and the multiple status indicator lamps connect.MCU passes through temperature sensor, voltage collection circuit The real time temperature and supply voltage of optical module are obtained in real time, and judge whether temperature and supply voltage are wanted in the work of optical module It asks in range；When operating temperature and operating voltage in the normal range when (for example, temperature is -40~+85 DEG C, voltage is 3.135~3.465V), optical module works normally, and the display of MCU state of a control indicator light works normally information；When module work temperature When degree or supply voltage are more than job requirement range, MCU state of a control indicator light display alarm information, and by inside MCU Control switch is cut off the power the power supply that interface is connected, to protect tested host equipment and optical module.

In a specific embodiment, above-mentioned multiple status indicator lamps include at least two different colors of state and refer to Show lamp, for example including a red LED and a green LED, by different display combinations of states, intuitively by optical module Working condition show that and it is aobvious that can the relevant informations such as the DDM (digital diagnostic monitoring) that Host host is shown be carried out with supplement Show, working condition shown by status indicator lamp is as shown in table 1 below:

Table 1

In a preferred embodiment, the optical module for local loopback test further includes for storing in working condition Portion's memory, MCU are further used for through I2C bus interface from host equipment reception state more new command, and more according to state New command between low power consumption control interface and internal storage, reset between control interface and internal storage, model selection Switch the work of optical module between control interface and internal storage and between malfunction instruction interface and internal storage State.

Fig. 2 shows the optical module courses of work for local loopback test according to the utility model exemplary embodiment Schematic diagram.It establishes and connects when multiple interfaces interface corresponding with tested host equipment in optical module according to preset protocol encapsulation After connecing, the MCU in optical module opens power interface connection power supply (step 201) within the time that preset protocol requires, and is arranged Initial modulation mode, level of power consumption (step 202).For example, being set according to the optical module initial modulation mode that QSFP-DD MSA is encapsulated It is set to PAM-4, level of power consumption 8W.

MCU receives loopback test from Host by I2C bus interface and instructs (step 203), and is instructed according to loopback test To determine whether being modulated pattern switching and/or level of power consumption switching.Specifically, it is according to loopback test instruction judgement first It is no use PAM-4 modulating mode (step 204), if host equipment instruction using PAM-4 modulating mode and with initial modulation mode It is identical, then not switch modulation mode.

It (is needed under PAM-4 modulating mode since the corresponding level of power consumption of PAM-4 with NRZ modulating mode is different under same rate CDR module/chip interior DSP function is opened, and NRZ modulating mode does not need to open), level of power consumption need to be calculated by MCU It compensates afterwards and by the selection of program-controlled multipath control switch.Therefore it needs to further determine whether switching level of power consumption (step 205)；If host equipment instruction raises or lowers level of power consumption, MCU controls multipath control switch by GPIO interface and is connected Or one or more of multiple load resistances are disconnected come corresponding load power consumption is arranged to match in loopback test instruction finger Show level of power consumption (step 206)；After being not required to carry out level of power consumption switching or complete switching, MCU is via MDIO/MDC bus Interface Controller CDR module establishes the network mapping (step 207) between input signal interface and output signal interface.Later, it controls CDR module processed can send data packet under the driving of PAM-4 modulating mode.

After above-mentioned steps 204, if host equipment instruction using NRZ modulating mode and not identical as initial modulation mode, Then modulating mode is switched to NRZ by corresponding register in MDIO/MDC bus interface selection CDR module and modulates mould by MCU Formula (step 208)；

Further, MCU judges whether to switch level of power consumption (step 205)；If host equipment instruction raises or lowers Level of power consumption opens corresponding channel multichannel loading switch then to match the instruction level of power consumption (step in loopback test instruction 206)；And establish the network mapping (step 207) between input signal interface and output signal interface.Later, CDR module is controlled PRBS31 (default) pattern can be used to send data packet under the driving of NRZ modulating mode.

The optical module for local loopback test of the various embodiments described above can be 8 according to QSFP-DD MSA protocol encapsulation Channel, 200/400Gbps rate, hot-swappable, 76 pins transceiver configuration, single channel rate be 25Gbps or 50Gbps, initial modulation mode is NRZ, initial modulation mode when single channel rate is 50Gbps when single channel rate is 25Gbps For PAM-4, target power consumption < 8W.

The optical module for local loopback test of the various embodiments described above can also be 4 logical according to CFP MSA protocol encapsulation Road, 100Gbps rate, hot-swappable, 148 pins transceiver configuration, single channel rate 25Gbps, and single channel rate Initial modulation mode is NRZ, target power consumption < 32W when for 25Gbps.

The optical module for local loopback test of the various embodiments described above can also be 4 logical according to CFP2MSA protocol encapsulation Road, 100/200Gbps rate, hot-swappable, 96 pins transceiver configuration, single channel rate are 25Gbps or 50Gbps, And single channel rate when being 25Gbps initial modulation mode be NRZ；Initial modulation mode is when single channel rate is 50Gbps PAM-4, target power consumption < 12W.

The optical module for local loopback test of the various embodiments described above can also be 4 logical according to CFP4MSA protocol encapsulation Road, 100/200Gbps rate, hot-swappable, 56 pins transceiver configuration, single channel rate are 25Gbps or 50Gbps, And single channel rate when being 25Gbps initial modulation mode be NRZ；Initial modulation mode is when single channel rate is 50Gbps PAM-4, target power consumption < 6W.

The optical module for local loopback test of the various embodiments described above can also be 8 logical according to CFP8MSA protocol encapsulation Road, 400Gbps rate, hot-swappable, 124 pins transceiver configuration, single channel rate 50Gbps, and single channel rate For 50Gbps, initial modulation mode is PAM-4, target power consumption < 18W.

The optical module for local loopback test of the various embodiments described above can also be 8 logical according to OSFP MSA protocol encapsulation Road, 400Gbps rate, hot-swappable, 60 pins transceiver configuration, single channel rate 50Gbps, and single channel rate For 50Gbps, initial modulation mode is PAM-4, target power consumption < 13W.

Fig. 3 shows the structure point of the optical module for local loopback test according to the utility model exemplary embodiment Solve schematic diagram.Fig. 4 shows the optical module shape knot for local loopback test according to the utility model exemplary embodiment Structure schematic diagram.The optical module of exemplary embodiment shown in Fig. 3 and Fig. 4 is according to QSFP-DD MSA protocol encapsulation, according to such as The optical module structure difference of the protocol encapsulations such as CFP, CFP2, CFP4, CFP8, OSFP MSA is that package dimension, golden finger (connect Mouthful, pin) define and the difference of target power consumption etc..As shown in figure 3, the structural member of the optical module includes pedestal 1, unlock piece drawstring 2, spring 3, PCB component 4, LED light tube 5, protection plug 6, cover board 7 and screw 8.

Wherein, unlock piece drawstring 2 is connected with the solution locked groove on pedestal 1, and two springs 3 are respectively arranged in 1 two sides of pedestal Solution locked groove and unlock piece drawstring 2 formed space in；Attenuator circuit ATT, CDR module, micro-control unit MCU, multi-channel control are opened It closes and multiple load resistances is arranged on PCB component 4；The golden finger connection that LED light tube 5 and multiple interfaces are drawn In PCB component 4；

The erecting bed for being caught in PCB component 4 is provided on pedestal 1, and 1 one end of pedestal is provided with for being caught in LED light tube 5 Circular trough to be fixed；Be each provided on pedestal 1 and cover board 7 the opposite screw hole at least four positions with by for By screw 8 by the two combine fix；It can also include protection plug 6 for the device when being not used in protection optical module, With combined with pedestal 1 and cover board 7 it is fixed after the matched structure in one end.It is as shown in Figure 4 to be installed an exemplary light module.

Optical module in above-described embodiment for local loopback test has been internally integrated while having supported PAM-4 and NRZ etc. to adjust The CDR module of molding formula and corresponding balanced and forward error correction function, can either support PAM-4, NRZ modulating mode and corresponding expansion Rate, and the high speed signal data and clock of decaying can be restored and compensated, to improve measuring accuracy；Ce circuit Can support the standard application of 50Gbps and 25Gbps and following rate section, speed range cover Datacom, Application standard including Infiniband, Fiber Channel etc..Simultaneously by the working condition of control CDR, can make Loopback test module works under different modulating type and rate conditions, has widened the application environment of module；Also, it can lead to Stored program control system selection different power consumption grade is crossed, the test environment under a variety of loading conditions can be simulated, mentioned for network equipment host More tests have been supplied to select.

The above, the only detailed description of specific embodiment of the present invention, rather than limitations of the present invention. Those skilled in the technology concerned in the case where not departing from the principle and range of the utility model, the various replacements made, Modification and improvement should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of optical module for local loopback test, which is characterized in that the optical module includes: to be encapsulated according to preset protocol Multiple interfaces, attenuator circuit ATT, CDR module, micro-control unit MCU, multipath control switch and multiple load resistances；

Wherein, it is connected according to multiple interfaces of preset protocol encapsulation for interface corresponding with tested host equipment, It is multiple for data packet to occur to host equipment including multiple input signal interfaces for from host equipment received data packet Output signal interface, six power interfaces for powering to optical module, the I2C including data line SDA and clock cable SCL Bus interface and the control of multiple states and instruction interface；Each input signal interface and output signal interface are disposed as list Interface can be switched in the rate of channel 25Gbps or 50Gbps；Input signal interface is connected to CDR module via attenuator circuit ATT；

MCU is used to be arranged according to preset protocol the initialization modulating mode and level of power consumption of optical module；MCU passes through I2C bus Interface is connect to receive the loopback test from host equipment and instruct and send diagnostic message to host equipment with host equipment, is led to It crosses MDIO/MDC bus interface to connect with CDR module, and is connect by GPIO interface with multipath control switch；MCU is further used The register in CDR module is arranged by MDIO/MDC bus interface to control CDR in information in being instructed according to loopback test Module carries out signal modulation using PAM-4 modulating mode or NRZ modulating mode, and switches each input according to modulating mode and believe The rate of number interface and output signal interface；

MCU is further used for being turned on or off according to identified modulating mode via GPIO interface control multipath control switch more Corresponding load power consumption value is arranged to match the corresponding level of power consumption of preset protocol in one or more of a load resistance, and The network mapping between input signal interface and output signal interface is established via MDIO/MDC bus interface control CDR module.

2. optical module according to claim 1, which is characterized in that the attenuator circuit ATT includes 8 π type attenuator circuits, Each of these is made of 4 digital resistors, by the combination of different digital resistor, carries out different brackets to signal Decaying.

3. optical module according to claim 1, which is characterized in that the CDR module includes sequentially connected continuous time Linear equalizer CTLE, ce circuit and forward error correction FEC repeat circuit；

Multiple AC coupled capacitors are connected between the input terminal and output end of CDR module to filter out the direct current in high-frequency signal point Amount.

4. optical module according to claim 1, which is characterized in that the optical module further comprises connecting via GPIO interface It is connected to the temperature sensor, voltage collection circuit and multiple status indicator lamps of MCU.

5. optical module according to claim 4, which is characterized in that the MCU is used to pass through temperature sensor, voltage acquisition Obtain to circuit period the real time temperature and supply voltage of optical module, and judge temperature and supply voltage whether optical module work It is required in range；When operating temperature and operating voltage in the normal range when, optical module work normally, MCU state of a control Indicator light display works normally information；When module operating temperature or supply voltage are more than job requirement range, MCU state of a control Indicator light display alarm information, and cut off the power the power supply that interface connected by the control switch inside MCU, it is tested to protect Host equipment and optical module.

6. optical module according to claim 1, which is characterized in that the MCU is further used for first according to loopback test Instruction judges whether using PAM-4 modulating mode, if host equipment instruction using PAM-4 modulating mode and with initial modulation mode It is identical, then not switch modulation mode；And further determine whether switching level of power consumption；If host equipment instruction raises or lowers Level of power consumption, then MCU controls be turned on or off in multiple load resistances one or more of multipath control switch by GPIO interface A instruction level of power consumption corresponding load power consumption value is arranged to match in loopback test instruction；It is being not required to carry out level of power consumption Switching is completed after switching, and MCU establishes input signal interface via MDIO/MDC bus interface control CDR module and output is believed Network mapping between number interface, and control CDR module and send data packet under the driving of PAM-4 modulating mode.

7. optical module according to claim 6, which is characterized in that if host equipment instruction uses NRZ modulating mode And it is not identical as initial modulation mode, then MCU by MDIO/MDC bus interface select in CDR module corresponding register by Modulating mode is switched to NRZ modulating mode；Further, MCU judges whether to switch level of power consumption；If host equipment instruction improves Or reduce level of power consumption, then corresponding channel multichannel loading switch is opened to match the instruction power consumption etc. in loopback test instruction Grade；And the network mapping between input signal interface and output signal interface is established, control CDR module can modulate mould in NRZ Data packet is sent under the driving of formula.

8. optical module according to claim 1, which is characterized in that described to be connect according to each input signal of modulating mode switching The rate of mouth and output signal interface includes: when using PAM-4 modulating mode by each input signal interface and output signal The rate of interface is switched to 50Gbps, by each input signal interface and output signal interface when using NRZ modulating mode Rate is switched to 25Gbps.

9. optical module according to any one of claim 1 to 8, which is characterized in that the preset protocol be QSFP-DD, One of CFP, CFP2, CFP4, CFP8, OSFP MSA agreement.

10. optical module according to claim 9, which is characterized in that the optical module structure part includes pedestal, unlock piece drawing Band, spring, PCB component, LED light tube, cover board and screw；

Wherein, attenuator circuit ATT, CDR module, micro-control unit MCU, multipath control switch and multiple load resistances are all provided with It sets in PCB component, the golden finger that LED light tube and multiple interfaces are drawn is connected to PCB component；It is provided with and is caught on pedestal The erecting bed of PCB component, and pedestal one end is provided in the circular trough for being caught in LED light tube to be fixed；Pedestal and The opposite screw hole at least four positions is each provided on cover board to fix by corresponding the two to be combined to screw.