WO2023016125A1

WO2023016125A1 - Optical module and signal calibration method

Info

Publication number: WO2023016125A1
Application number: PCT/CN2022/102450
Authority: WO
Inventors: 张玉娜; 石良; 侯利霖; 李振懂; 李世琦
Original assignee: 青岛海信宽带多媒体技术有限公司
Priority date: 2021-08-11
Filing date: 2022-06-29
Publication date: 2023-02-16

Abstract

The present application discloses an optical module, comprising: a circuit board, one end of the circuit board being provided with a connecting finger; and an MCU, which is provided on the circuit board and which comprises an I2C interface, the I2C interface being electrically connected to an I2C pin on the connecting finger, wherein the MCU comprises: a register which stores an indication value inputted by a user., the indication value being used to indicate to calibrate an optical module signal. The present application also discloses a method for calibrating an optical module signal, comprising: storing an indication value into a register of an optical module, the indication value being used to indicate to calibrate an optical module signal; and reading the indication value by means of an upper computer so as to calibrate the signal of the optical module.

Description

A kind of optical module and signal calibration method

This application claims the priority of the Chinese patent application with application number 202110918914.6 filed on August 11, 2021, and the priority of the Chinese patent application with application number 202110948204.8 filed on August 18, 2021, all of which The contents are incorporated in this application by reference.

technical field

The present disclosure relates to the technical field of optical communication, and in particular to an optical module and a signal calibration method.

Background technique

In order to realize version compatibility, the receiving end of XGSPON OLT must support both 2.5G rate and 10G rate. The system single board indicates whether the upstream burst packet at this time is an XGPON ONU (2.5G rate) or an XGSPON ONU (10G rate) through the rate selection signal Ratesel provided by the electrical interface of the optical module.

Contents of the invention

In one aspect, the present disclosure provides an optical module, including:

A circuit board, one end of the circuit board is provided with a golden finger;

The MCU is arranged on the circuit board and includes an I2C interface, the I2C interface is electrically connected to the I2C pin on the golden finger,

Wherein, the MCU includes:

The register stores an indication value input by the user, and the indication value is used to indicate the calibration of the optical module signal.

On the other hand, the present disclosure provides a method for calibrating optical module signals, including:

The indication value is stored in the register of the optical module, and the indication value is read by the host computer for calibrating the signal of the optical module.

Description of drawings

In order to illustrate the technical solutions of the present disclosure more clearly, the following will briefly introduce the accompanying drawings used in the embodiments. Obviously, for those of ordinary skill in the art, on the premise of not paying creative work, Additional drawings can also be derived from these drawings.

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

FIG. 2 is a schematic structural diagram of an optical network terminal.

Fig. 3 is a schematic structural diagram of an optical module provided by some embodiments of the present disclosure.

Fig. 4 is a schematic diagram of an exploded structure of an optical module provided by some embodiments of the present disclosure.

Fig. 5 is a schematic diagram of an internal structure of an optical module provided by some embodiments of the present disclosure.

Fig. 6 is a schematic diagram of an interaction relationship between an optical module and a host computer provided by some embodiments of the present disclosure.

Fig. 7 is a schematic diagram of another interaction relationship between an optical module and a host computer provided by some embodiments of the present disclosure.

FIG. 8 is a conversion block diagram of the reported value of the bias current in the embodiment of FIG. 7 .

FIG. 9 is a block diagram of conversion of transmit power reported values in the embodiment of FIG. 7 .

FIG. 10 is a block diagram of conversion of reported received power values in the embodiment of FIG. 7 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

One of the core links of optical fiber communication is the mutual conversion of optical and electrical signals. Optical fiber communication uses optical signals carrying information to be transmitted in information transmission equipment such as optical fibers/optical waveguides, and the passive transmission characteristics of light in optical fibers/optical waveguides can be used to achieve low-cost, low-loss information transmission; and information processing equipment such as computers Electric signals are used. In order to establish an information connection between information transmission equipment such as optical fibers/optical waveguides and information processing equipment such as computers, it is necessary to realize mutual conversion between electrical signals and optical signals.

The optical module realizes the above-mentioned mutual conversion function of optical and electrical signals in the field of optical fiber communication technology, and the mutual conversion of optical signals and electrical signals is the core function of the optical module. The optical module realizes the electrical connection with the external host computer through the gold finger on its internal circuit board. The main electrical connection includes power supply, I2C signal, data signal and grounding; the electrical connection method realized by the gold finger has become an optical module The mainstream connection method in the industry, based on this, the definition of the pins on the golden finger has formed a variety of industry protocols/standards.

FIG. 1 is a schematic diagram of a connection relationship of an optical communication terminal. As shown in Figure 1, the connection of the optical communication terminal mainly includes the interconnection between 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 to the remote server, and one end of the network cable 103 is connected to the local information processing equipment. The connection between the local information processing equipment and the remote server is completed by the connection between the optical fiber 101 and the network cable 103; The optical network terminal 100 having the optical module 200 is completed.

The optical port of the optical module 200 is connected to the optical fiber 101, and a bidirectional optical signal connection is established with the optical fiber 101; the electrical port of the optical module 200 is connected to the optical network terminal 100, and a bidirectional electrical signal connection is established with the optical network terminal 100; Internally realize the mutual conversion between optical signal and electrical signal, so as to realize the establishment of information connection between the optical fiber and the optical network terminal; The electrical signal of the optical network terminal 100 is converted into an optical signal by the optical module and input into the optical fiber.

The optical module interface 102 of the optical network terminal is used to access the optical module 200 and establish a bidirectional electrical signal connection with the optical module 200; Signal connection; a connection is established between the optical module 200 and the network cable 103 through the optical network terminal 100. Specifically, the optical network terminal transmits the signal from the optical module to the network cable, and transmits the signal from the network cable to the optical module. The optical network terminal acts as an optical network terminal. The upper computer of the module monitors the work of the optical module.

So far, the remote server establishes a two-way signal transmission channel with the local information processing equipment through the optical fiber, optical module, optical network terminal and network cable.

Common information processing equipment includes routers, switches, electronic computers, etc.; the optical network terminal is the upper computer of the optical module, which provides data signals to the optical module and receives data signals from the optical module. The common optical module upper computer also has optical lines terminal etc.

FIG. 2 is a schematic structural diagram of an optical network terminal. As shown in Figure 2, the optical network terminal 100 includes a circuit board 105, and a cage 106 is arranged on the surface of the circuit board 105; an electrical connector is arranged inside the cage 106, which is used to connect to an optical module electrical port such as a gold finger; on the cage 106 A heat sink 107 is provided, and the heat sink 107 includes protrusions such as fins for increasing the heat dissipation area. The heat generated by the optical module is conducted to the cage 106 and then diffused through the heat sink 107 on the cage 106 .

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 .

FIG. 3 is a schematic structural diagram of an optical module 200 provided by an embodiment of the present disclosure, and FIG. 4 is a schematic diagram of an exploded structure of the optical module 200 provided by an embodiment of the present disclosure. As shown in FIG. 3 and FIG. 4 , the optical module 200 provided by the embodiment of the present disclosure includes an upper housing 201 , a lower housing 202 , a circuit board 300 , an unlocking handle 203 , a light emitting sub-module 206 and a light receiving sub-module 207 .

The upper casing 201 is covered on the lower casing 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity generally presents a square body, specifically, the lower casing 202 includes a bottom plate and a Two lower side plates vertically arranged on the bottom plate; the upper shell 201 includes a cover plate, and the cover plate covers the two lower side plates of the lower shell 201 to form a shell. In some other embodiments, the upper housing 201 includes a cover plate and two upper side plates located on both sides of the cover plate and perpendicular to the cover plate. The two upper side plates are combined with the two lower side plates to realize the upper The casing is covered on the lower casing.

The direction of the line connecting the two

openings

204 and 205 may be consistent with the length direction of the optical module 200 , or may not be consistent with the length direction of the optical module 200 . The opening 204 is an electrical port, and the golden finger of the circuit board extends from the electrical port 204, and is inserted into a host computer (such as an optical network terminal); the opening 205 is an optical port, which is configured to connect to an external optical fiber, so that the external optical fiber is connected to the inside of the optical module The light emitting sub-module 206 and the light receiving sub-module 207.

The combination of the upper case and the lower case is used to facilitate the installation of components such as the circuit board 300, the light emitting sub-module 206 and the light receiving sub-module 207 into the case, and these devices are packaged by the upper case and the lower case Protect. In some embodiments, the upper casing and the lower casing are made of metal materials, which is beneficial to realize electromagnetic shielding and heat dissipation; generally, the casing of the optical module is not made into an integrated structure, so that when assembling components such as circuit boards, positioning components, Heat dissipation and electromagnetic shielding structures cannot be installed, which is also not conducive to production automation.

The unlocking handle 203 is located on the outer wall of the enveloping cavity/lower housing 202, and is used to realize the fixed connection between the optical module and the host computer, or release the fixed connection between the optical module and the host computer.

The unlocking handle 203 has an engaging structure matching the cage of the upper computer; pulling the end of the unlocking handle can make the unlocking handle move relatively on the surface of the outer wall; the optical module is inserted into the cage of the upper computer, and the optical module is fixed by the engaging structure of the unlocking handle In the cage of the upper computer; by pulling the unlocking handle, the locking structure of the unlocking handle moves accordingly, and then changes the connection relationship between the locking structure and the upper computer, so as to release the locking relationship between the optical module and the upper computer, so that the optical module can be connected to the upper computer. The module is pulled out from the host computer's cage.

The optical transmitting sub-module 206 and the optical receiving sub-module 207 are respectively used for transmitting and receiving optical signals. The light emitting sub-module 206 and the light receiving sub-module 207 can also be combined to form an integrated light-receiving structure. Wherein, the light-emitting sub-module 206 includes a light-emitting chip and a backlight detector, and the light-receiving sub-module 207 includes a light-receiving chip.

The circuit board 300 is located in the package cavity formed by the upper housing 201 and the lower housing 202, and the circuit board 300 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, MOS tubes) and chips (such as microprocessors) MCU, laser driver chip, limiting amplifier, clock data recovery CDR, power management chip, data processing chip (DSP), etc.

In some embodiments, the transimpedance amplifier can be packaged independently; in other embodiments, the light-receiving chip and the transimpedance amplifier are packaged independently together, such as being packaged in the same coaxial shell TO or in the same square cavity, through The package is electrically connected to the circuit board 300; in some other embodiments, instead of using an independent package, the light receiving chip and the transimpedance amplifier are arranged on the surface of the circuit board; in some embodiments, the light receiving chip independent packaging, and the transimpedance amplifier is set on the circuit board.

The chip on the circuit board can be an all-in-one chip. For example, the laser driver chip and MCU chip can be fused into one chip, or the laser driver chip, limiting amplifier chip and MCU can be fused into one chip. The chip is an integration of circuits, but The function of each circuit does not disappear because of the assembly, but the circuit form is integrated. Therefore, when the circuit board is equipped with three independent chips of MCU, laser driver chip and limiting amplifier chip, this is equivalent to setting a single chip with three functions in one on the circuit.

The circuit board 300 connects the electrical devices in the optical module together according to the circuit design through circuit traces, so as to realize electrical functions such as power supply, electrical signal transmission, and grounding. The circuit board 300 is the carrier of the main electrical components of the optical module. The electrical components not on the circuit board are also electrically connected to the circuit board. The electrical connector on the circuit board 300 realizes the electrical connection between the optical module and its host computer.

The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the bearing function, such as the rigid circuit board can carry chips stably; The rigid circuit board can also provide a stable load; the rigid circuit board can also be inserted into the electrical connector in the cage of the upper computer, specifically, metal pins/golden fingers are formed on one end surface of the rigid circuit board for Connect with electrical connectors; these are not convenient for flexible circuit boards.

The end surface of the circuit board 300 has a gold finger 301, which is composed of independent pins. The circuit board 300 is inserted into the electrical connector in the cage, and the gold finger establishes an electrical connection with the host computer. The I2C protocol can be used between the host computer and the optical module to transmit information through the I2C pin. The upper computer can write information to the optical module, specifically, the upper computer can write information into the register of the optical module; the optical module cannot write information to the upper computer, when the optical module needs to provide information to the upper computer, the optical module The information will be written into the preset register in the optical module, and the host computer will read the register. The register of the optical module is generally integrated in the MCU of the optical module, and can also be independently set on the circuit board 300 of the optical module.

Some optical modules also use flexible circuit boards as a supplement to rigid circuit boards; flexible circuit boards are generally used in conjunction with rigid circuit boards, such as flexible circuit boards can be used to connect rigid circuit boards and optical transceivers.

The optical transmitting sub-module 206 and the optical receiving sub-module 207 are respectively used for transmitting and receiving optical signals. In this disclosure, the light emitting sub-module 206 can be packaged in a coaxial TO, physically separated from the circuit board, and electrically connected through a flexible board; the light receiving sub-module 207 can also be packaged in a coaxial TO, physically separated from the circuit board, Make an electrical connection. In another common implementation manner, it can be arranged on the surface of the circuit board 300; in addition, the light emitting sub-module 206 and the light receiving sub-module 207 can also be combined together to form an integrated optical transceiver structure.

Fig. 5 is a schematic diagram of a partial structure of an optical module provided by some embodiments of the present disclosure. As shown in FIG. 5 , in the optical module provided by the embodiment of the present disclosure, rows of golden fingers 301 are arranged on the surface of one end of the circuit board 300 , MCU 302 is arranged on the circuit board 300 , and the rows of golden fingers 301 are formed independently of each other. The circuit board 300 is inserted into the electrical connector in the cage, the gold finger 301 is electrically connected to the host computer, and the MCU 302 is electrically connected to the gold finger 301. The optical receiving sub-module 207 includes an APD, a transimpedance amplifier chip (also known as a transimpedance amplifier, TIA), a limiting amplifier chip (also known as a limiting amplifier, LA) and an MCU302. The essence of a chip is the integration of circuits. Circuits can be integrated into chips, and some functions in chips can also be realized by circuits on circuit boards. The functions of the chip can be realized by the chip, by the circuit, or by the combination of the main chip and the peripheral circuit. Different functions can also be integrated by the same chip, and changes in the form of circuit integration still fall within the protection scope of the present invention.

In the process of receiving the optical signal, the optical receiving sub-module 207 is internally provided with an optical receiving chip, and a common optical receiving chip may be an APD, which is used to receive the optical signal sent by the external device and convert the optical signal sent by the external device into electrical signal; the input pin of the transimpedance amplifier chip is connected to the output pin of the optical receiving sub-module 207, and is used to convert the electrical signal output by the optical receiving sub-module 207 into a voltage signal; the high-frequency signal input pin of the limiting amplifier chip The pin is connected to the output pin of the transimpedance amplifier chip, and is used to amplify the first voltage signal output by the transimpedance amplifier chip; the input pin of the clock data recovery chip is connected to the high frequency signal output pin of the limiting amplifier chip, It is used to shape the voltage signal output by the limiting amplifier chip, and the output pin of the clock data recovery chip is connected to the golden finger 301 . The golden finger 301 is connected to the host computer, and then the signal received by the optical module can be sent to the host computer.

For optical modules with different specifications, there are differences between their signals. For example, according to different board designs, the polarity of the rate selection signal Ratesel in the optical module may be different. However, the SFF-8472 protocol does not specify the polarity of the rate selection signal Ratesel, resulting in no uniform correspondence between the level and the output rate. As another example, in the optical module communication protocol such as SFF-8472 protocol, the unit for calibrating the laser bias current, transmit power, and receive power is the default, that is, the bias current is 2uA, and the transmit power and receive power are 0.1 uW. In this way, the monitoring range of the bias current is only 0-131mA, and the monitoring range of the transmitting power and receiving power is only -40-8.2dBm. However, the ranges of bias current, transmit power, and receive power of high-spec products are beyond the above-mentioned range.

Therefore, it is necessary to define/calibrate the signal of the optical module so that it can cover various applications with different product specifications. By enabling the registers in the user-writable area to indicate, and by reading the values stored in these registers for confirmation/corresponding conversion, it is compatible with various optical module products within the current SFF-8472 framework.

In some embodiments, a register is used to store an indication of the polarity of the rate select signal Ratesel. When the indicated value is the first preset value (for example, 1), it means that the rate selection signal Ratesel received by the optical module corresponds to the high rate mode when the level is high, and the signal processing unit of the optical module configures the transmission rate to be high at this time Transmission rate, when the level is low, it corresponds to the low rate mode. At this time, the signal processing unit configures the transmission rate as a low transmission rate; when the indicated value is the second preset value (for example, 0), it indicates the rate received by the optical module When the level of the selection signal Ratesel is high, it corresponds to the low rate mode, and when the level is low, it corresponds to the high rate mode.

Specifically, the first preset value or the second preset value is stored in the register, and when the upper computer detects that the first preset value is stored in the register, the rate selection signal is configured with a high level or a low level to generate Level command signal, and send the level command signal to the signal processing unit inside the optical module, the signal processing unit judges the level state of the level command signal, judges whether it is a high level state or a low level state, and then The corresponding transmission rate is configured according to the judgment result of the level state; when the host computer monitors that the second preset value is stored in the register, it also performs corresponding processing.

Specifically, when the data stored in the register is the first preset value, the signal processing unit receives the level command signal provided by the host computer, and when the level command signal is in a high level state, the signal processing unit configures the transmission rate as High transmission rate, when the level instruction signal is in a low level state, the signal processing unit is configured to configure the transmission rate as a low transmission rate; when the register stores the second preset value, the signal processing unit receives the power provided by the host computer Level command signal, when the level command signal is in a high level state, the signal processing unit configures the transmission rate as a low transmission rate, and when the level command signal is in a low level state, the signal processing unit configures the transmission rate as a high transmission rate rate.

It can be understood that the level command signal in the present disclosure is generated after the level state is configured for the rate selection signal, and it is not a specific data signal of a certain value, but a long-term level state of the rate selection signal Signal.

The related solution of the rate selection signal polarity calibration provided by the present disclosure will be described below with reference to FIG. 6 .

The optical module provided by this disclosure includes an MCU, and the MCU includes registers. Since this disclosure is an extension of the existing SFF-8472 protocol, this disclosure does not use registers within the scope of the SFF-8472 protocol specification, but uses the SFF-8472 protocol specification For registers outside the scope, such as registers in the user-writable area, it is understandable that when the expansion of the existing SFF-8472 protocol provided by this disclosure is absorbed by the protocol, the registers in this disclosure will be included in SFF-8472 8472 protocol within the scope of regulations.

In order to describe the solution, the registers in this disclosure take the A0[64]bit6 register as an example. It can be understood that this disclosure does not limit the specific registers, and the registers in other user-writable areas are within the scope of protection of the embodiments of the disclosure Inside.

In the embodiment of the present disclosure, the first preset value or the second preset value is stored in the A0[64]bit6 register. In the embodiment of the present disclosure, the first preset value is "1" as an example, and the second preset value is in "0" as an example. It can be understood that in the embodiment of the present disclosure, the first preset value is "1" as an example, and the second preset value is "0" as an example only for the convenience of describing the solution. The first preset value and the second preset Other numerical values also belong to the protection scope of the present disclosure, and the present disclosure does not limit the corresponding specific numerical values of the first preset value and the second preset value.

When the first preset value "1" is written into the A0[64]bit6 register, the host computer detects that the data stored in A0[64]bit6 is 1, and then the host computer configures the corresponding level for the rate selection signal to obtain The level command signal, that is, the level command signal in the high level state or the level command signal in the low level state is provided, and then the level command signal is sent to the signal processing unit inside the optical module through the gold finger, the embodiment of the present disclosure The signal processing unit in the circuit can be a transimpedance amplifier or a limiting amplifier. In the transimpedance amplifier or limiting amplifier, it first judges whether the received level command signal is in a high level state or a low level state, and then configures the corresponding transmission rate. When the level command signal is in a high level state, the signal processing unit configures the transmission rate as a high transmission rate, and when the level command signal is in a low level state, the signal processing unit configures the transmission rate as a low transmission rate.

When the second preset value "0" is written into the A0[64]bit6 register, the host computer detects that the data stored in A0[64]bit6 is 0, and then the host computer configures the corresponding level for the rate selection signal to obtain The level command signal, that is, the level command signal in the high level state or the level command signal in the low level state is provided, and then the level command signal is sent to the signal processing unit inside the optical module through the gold finger, the embodiment of the present disclosure The signal processing unit in the circuit can be a transimpedance amplifier or a limiting amplifier. In the transimpedance amplifier or limiting amplifier, it first judges whether the received level command signal is in a high level state or a low level state, and then configures the corresponding transmission rate. When the level instruction signal is in a high level state, the signal processing unit configures the transmission rate as a low transmission rate, and when the level instruction signal is in a low level state, the signal processing unit configures the transmission rate as a high transmission rate.

The above content is related to the description of the execution content of the optical module after receiving the level command signal. The following is a description of the execution content of the host computer side.

In some embodiments, when a high transmission rate needs to be allocated, the host computer judges whether the A0[64]bit6 register stores 1 or 0, and if it is 1, the host computer configures a high level for the rate selection signal and generates a high level The level command signal in the flat state sends the level command signal in the high level state to the signal processing unit of the optical module, and the signal processing unit then transmits the signal according to the high level command signal and the value (1) stored in the register The rate configuration is a high transmission rate; if it is 0, the host computer configures a low level for the rate selection signal and generates a level command signal in a low level state, and sends the level command signal in a low level state to the signal of the optical module The processing unit, the signal processing unit then configures the transmission rate as a high transmission rate according to the low-level command signal and the value (0) stored in the register.

In some embodiments, when a low transmission rate needs to be allocated, the host computer judges whether the A0[64]bit6 register stores 1 or 0, and if it is 1, the host computer configures a low level for the rate selection signal and generates a low level The level command signal in the flat state sends the level command signal in the low level state to the signal processing unit of the optical module, and the signal processing unit then transmits according to the low level command signal and the value (1) stored in the register The rate is configured as a low transmission rate; if it is 0, the host computer configures a high level for the rate selection signal and generates a level command signal in a high level state, and sends the level command signal in a high level state to the signal of the optical module The processing unit, the signal processing unit then configures the transmission rate as a low transmission rate according to the high-level instruction signal and the value (0) stored in the register.

Specifically, a single board of the host computer is provided with a MAC chip, and the host computer uses the MAC chip as an execution subject.

When the first preset value 1 is written into the A0[64]bit6 register, the MAC chip of the upper computer detects that the data stored in A0[64]bit6 is 1, and then the MAC chip of the upper computer configures the rate selection signal as high level or low level, the level command signal is generated, and then the level command signal is sent to the signal processing unit inside the optical module through the golden finger. The signal processing unit in the embodiment of the present disclosure can be a transimpedance amplifier or a The corresponding transmission rate is configured in the limiting amplifier, the transimpedance amplifier or the limiting amplifier according to the specific level value of the rate selection signal.

When the second preset value 0 is written into the A0[64]bit6 register, the MAC chip of the upper computer detects that the data stored in A0[64]bit6 is 0, and then the MAC chip of the upper computer configures the corresponding rate selection signal After the level is obtained, the level command signal is obtained, and then the level command signal is sent to the signal processing unit inside the optical module through the gold finger. The signal processing unit in the embodiment of the present disclosure can be a transimpedance amplifier or a limiting amplifier. In the transimpedance amplifier or limiting amplifier, the corresponding transmission rate is configured according to the specific level value of the rate selection signal.

Among them, the host computer configures the specific level for the rate selection signal, the signal processing unit judges the level, and the specific implementation means of configuring the transmission rate according to the level are common methods, and will not be described further.

It can be known from the above that in the present disclosure, the signal processing unit receives the level command signal from the host computer, and configures the transmission rate according to the level command signal. When the data in the register is the first preset value, if the If the level command signal is in a high level state, the transmission rate is configured as a high transmission rate, and if the level command signal is in a low level state, the transmission rate is configured as a low transmission rate; when the data in the register is At the second preset value, if the level command signal is in a high level state, the transmission rate is configured as a low transmission rate, and if the level command signal is in a low level state, the transmission rate is configured as a high transmission rate .

This disclosure indicates the polarity of the rate selection signal Ratesel of the optical module by enabling the register in the user-writable area of the SFF-8472 protocol. The upper computer MAC reads the value of the corresponding register through I2C to confirm the setting of the optical module, and proceed accordingly Correct configuration; furthermore, on the basis of the existing SFF-8472 protocol, a calibration description of the polarity of the rate selection signal is added.

Based on the above optical module, the present disclosure provides a signal polarity calibration method, the method comprising:

receiving the first rate selection signal generated by the host computer according to the register value, and judging whether the level of the first rate selection signal is a high level or a low level;

When the level of the first rate selection signal is at a high level, configure the transmission rate as a high transmission rate, and when the level of the first rate selection signal is at a low level, configure the transmission rate as a low transmission rate.

Or, receiving the second rate selection signal generated by the host computer according to the register value, and judging that the level of the second rate selection signal is a high level or a low level;

When the level of the second rate selection signal is at a high level, configure the transmission rate as a low transmission rate, and when the level of the second rate selection signal is at a low level, configure the transmission rate as a high transmission rate.

Wherein, the register is A0[64]bit6.

Specifically, when the host computer monitors A0[64]bit6=1, the host computer generates a first rate selection signal for the configuration level of the rate selection signal, and sends the first rate selection signal to the signal processing unit;

The signal processing unit configures the transmission rate according to the level value of the first rate selection signal, including:

When the level of the first rate selection signal is a high level, configure the transmission rate as a high transmission rate;

When the level of the first rate selection signal is low, the transmission rate is configured as a low transmission rate.

When the host computer monitors A0[64]bit6=0, the host computer generates a second rate selection signal for the rate selection signal configuration level, and sends the second rate selection signal to the signal processing unit;

The signal processing unit configures the transmission rate according to the level value of the second rate selection signal, including

When the level of the second rate selection signal is a high level, configure the transmission rate as a low transmission rate;

When the level of the second rate selection signal is low, the transmission rate is configured as a high transmission rate.

Wherein the upper computer includes a MAC chip, and the MAC chip is used to read the register value, and configure the level of the rate selection signal according to the register value, and pass the rate selection signal after the configuration level through the gold The finger is sent to the signal processing unit.

In the optical module and the signal polarity calibration method provided in this embodiment, the optical module includes an MCU and a signal processing unit, and the MCU includes an I2C interface and a register, wherein the golden finger is connected through the I2C interface to enable the MCU to communicate with the upper computer I2C, and the register is Any register of the reserved bit of the storage unit in the MCU, when the first preset value is stored in the register, the signal processing unit receives the first rate selection signal generated by the host computer according to the register value, and selects the signal at the first rate. When the level is high, the signal processing unit is configured with a high transmission rate, and when the level of the first rate selection signal is low, the signal processing unit is configured with a low transmission rate; when the second preset value is stored in the register, The signal processing unit receives the second rate selection signal generated by the host computer according to the register value, and when the level of the second rate selection signal is high, the signal processing unit configures a low transmission rate, and when the level of the second rate selection signal is When low, the signal processing unit configures a high transfer rate.

In this disclosure, the polarity of the rate selection signal Ratesel of the optical module can be indicated by enabling the reserved byte in the SFF-8472 protocol, that is, the register in the reserved bit of the storage unit, and the upper computer MAC reads the value of the corresponding register through I2C to confirm the optical The setting of the module, and the correct configuration accordingly; and then realize the calibration description of the polarity of the rate selection signal.

According to other embodiments of the present disclosure, related solutions for defining each calibration unit are provided. By enabling each register in the user-writable area of SFF-8472 to indicate the unit used for calibration of the optical module, the device MAC reads through I2C Take the values of these registers to confirm the units and perform corresponding conversions to achieve compatibility with optical module products of various specifications under the current SFF-8472 framework.

The related solution for defining each calibration unit provided by the present disclosure will be specifically described below with reference to FIG. 7 .

In the embodiment of the present disclosure, registers outside the scope of the SFF-8472 protocol specification are selected, such as registers in the user-writable area, which are respectively defined as the first register, the second register, and the third register, and the first register, the second register, and the third register The registers are respectively used to store the laser bias current calibration unit indication value, the transmitted optical power calibration unit indication value and the received optical power calibration unit indication value. Users can customize the corresponding laser bias current calibration unit indication value according to the rules of optical module products , transmit optical power calibration unit indication value, and receive optical power calibration unit indication value, and store the customized laser bias current calibration unit indication value, transmit optical power calibration unit indication value, and receive optical power calibration unit indication value in the corresponding In the register, waiting for the host computer to read.

The embodiment of the present disclosure also includes a fourth register, a fifth register and a sixth register, and the fourth register, the fifth register and the sixth register are respectively used to store the sampled value of the laser bias current, the sampled value of the transmitted optical power and the received optical power sample value.

It can be understood that the fourth register, the fifth register and the sixth register are registers within the scope of the SFF-8472 protocol specification.

In the embodiment of the present disclosure, the fourth register, the first register, the fifth register, the second register, the sixth register and the third register can respectively select A2[100:101], A2[248]bit7:4, A2[102 :103], A2[248]bit3:0, A2[104:105] and A2[249]bit7:4, and other registers in the reserved bits of the storage unit can also be selected, and the specific registers are not limited in this disclosure. Only the above six registers are used as an example for description.

The fourth register such as A2[100:101] is used to store the sampled value of the laser bias current.

The first register such as A2[248]bit7:4 is used to store the indication value of the laser bias current calibration unit, which is specifically selected according to the rules of the optical module product. The following is an example of specific data. In some embodiments, when the indicated value of the laser bias current calibration unit is 2, it means that the laser bias current calibration unit is 2uA, and when the indicated value of the laser bias current calibration unit is 4, it means that the laser bias current Set the current calibration unit to 4uA, and so on, the user can customize the specific laser bias current calibration unit according to the specifications of the optical module product, and then store the customized laser bias current calibration unit in the form of an indicated value in the first In the register, waiting for the host computer to read. It should be noted that the laser bias current calibration unit can be more than two preset values, not only 2uA and 4uA, but also 6uA, 10uA, 14uA and other gears if there are new products in the future. The fifth register, such as A2[102:103], is used to store the sampled value of the transmitted optical power.

The second register such as A2[248]bit3:0 is used to store the indication value of the calibration unit of the transmitted optical power. When the power calibration unit indication value is 2, it means that the transmit optical power calibration unit is 0.2uW. By analogy, the user can customize the specific transmit optical power calibration unit according to the specifications of the optical module product, and then set the customized transmit optical power calibration unit to It is stored in the second register in the form of an indication value, waiting for the host computer to read.

It should be noted that the emission optical power calibration unit can be more than two preset values, not only 0.1uW and 0.2uW, but also 0.3uW, 0.4uW and other gears if there are new products in the future.

The sixth register, such as A2[104:105], is used to store the sampled value of the received optical power.

The third register such as A2[249]bit7:4 is used to store the received optical power calibration unit indication value. In some embodiments, when the received optical power calibration unit indication value is 1, it means that the received optical power calibration unit is 0.1uW, and the received optical power When the power calibration unit indication value is 2, it means that the received optical power calibration unit is 0.2uW. By analogy, the user can customize the specific received optical power calibration unit according to the specifications of the optical module product, and then set the customized received optical power calibration unit to It is stored in the third register in the form of indicated value, waiting for the upper computer to read.

It should be noted that the received optical power calibration unit can be more than two preset values, not only 0.1uW and 0.2uW, but also 0.3uW, 0.4uW and other gears if there are new products in the future.

After storing the corresponding data in the corresponding registers, wait for the host computer to read. Specifically, the host computer includes a MAC chip, and the MAC chip in the host computer reads the corresponding data from the corresponding registers, and then the MAC chip performs the calculation according to the corresponding formula. The reported values of laser bias current, transmitted optical power and received optical power are converted, and the MAC chip reports each reported value to the processor of the host computer, and the processor performs subsequent monitoring or processing. The specific process of reading and converting by the MAC chip include:

The host computer respectively reads the laser bias current sampling value and the laser bias current calibration unit indication value from the fourth register and the first register, and obtains the reported value of the laser bias current based on the first formula;

The host computer respectively reads the sampled value of the transmitted optical power and the calibration unit indication value of the transmitted optical power from the fifth register and the second register, and obtains the reported value of the transmitted optical power based on the second formula;

The host computer respectively reads the received optical power sampling value and the received optical power calibration unit indication value from the sixth register and the third register, and obtains the received optical power reported value based on the third formula. Referring to Figure 8, the host computer reads the sampled value of the laser bias current and the calibration unit indication value of the laser bias current from the fourth register and the first register respectively, and obtains the reported value of the laser bias current based on the first formula, including :

Obtain the reported value of the laser bias current according to TxBias=TX_BIAS_AD*TX_BIAS_U*0.001, where TxBias is the reported value of the laser bias current, TX_BIAS_AD is the sampling value of the laser bias current, and TX_BIAS_U is the calibration unit indication value of the laser bias current.

Referring to Figure 9, the host computer reads the transmitted optical power sampling value and the transmitted optical power calibration unit indication value from the fifth register and the second register respectively, and obtains the transmitted optical power reported value based on the second formula, including:

According to TxPower=10*Log10(TX_PWR_AD*TX_PWR_U*0.0001), the transmitted optical power report value is obtained, where TxPower is the transmitted optical power reported value, TX_PWR_AD is the transmitted optical power sampling value, and TX_PWR_U is the transmitted optical power calibration unit indication value.

Referring to Figure 10, the host computer reads the received optical power sampling value and the received optical power calibration unit indication value from the sixth register and the third register respectively, and obtains the received optical power reported value based on the third formula, including:

According to RxPower=10*Log10(RX_PWR_AD*RX_PWR_U*0.0001), the received optical power reported value is obtained, where RxPower is the received optical power reported value, RX_PWR_AD is the received optical power sampling value, and RX_PWR_U is the received optical power calibration unit indication value.

Users can customize the corresponding laser bias current calibration unit indication value, transmit optical power calibration unit indication value and receive optical power calibration unit indication value according to the rules of optical module products, and indicate the customized laser bias current calibration unit The value, the indication value of the calibration unit of the transmitted optical power and the indication value of the calibration unit of the received optical power are stored in the corresponding registers, waiting for the host computer to read.

This disclosure indicates the units used by the optical module for calibration by enabling the registers in the user-writable area of SFF-8472. The device MAC reads the values of these registers through I2C to confirm the units and perform corresponding conversions. In the current SFF- Under the framework of 8472, it is compatible with optical module products of various specifications.

Based on the above optical module, the present disclosure also provides a calibration unit definition method, specifically, the method includes:

Based on the optical module product specification, the laser bias current calibration unit indication value is stored in the first register, and the laser bias current calibration unit indication value is read by the host computer for calibrating the laser bias current sampling value;

Based on the optical module product specification, the transmit optical power calibration unit indication value is stored in the second register, and the transmit optical power calibration unit indication value is read by the host computer for calibrating the transmit optical power sampling value;

Based on the optical module product specification, the received optical power calibration unit indication value is stored in the third register, and the received optical power calibration unit indication value is read by the host computer for calibrating the received optical power sampling value.

Users can customize the corresponding laser bias current calibration unit indication value, transmit optical power calibration unit indication value and receive optical power calibration unit indication value according to the rules of optical module products, and indicate the customized laser bias current calibration unit The value, the indication value of the calibration unit of the transmitted optical power and the indication value of the calibration unit of the received optical power are stored in the corresponding registers, waiting for the host computer to read. Then, the upper computer performs conversion according to the corresponding formula to obtain the reported values of laser bias current, transmitted optical power and received optical power, and reports each reported value to the processor of the upper computer for subsequent monitoring or processing.

Specifically, the reported value of the laser bias current is obtained according to TxBias=TX_BIAS_AD*TX_BIAS_U*0.001, wherein TxBias is the reported value of the laser bias current, TX_BIAS_AD is the sampling value of the laser bias current, and TX_BIAS_U is the calibration unit indication value of the laser bias current;

According to TxPower=10*Log10(TX_PWR_AD*TX_PWR_U*0.0001), the transmitted optical power report value is obtained, wherein TxPower is the transmitted optical power reported value, TX_PWR_AD is the transmitted optical power sampling value, and TX_PWR_U is the transmitted optical power calibration unit indication value;

This disclosure can indicate the units used for optical module calibration by enabling the registers in the user-writable area of SFF-8472. The device MAC reads the values of these registers through I2C to confirm the units and perform corresponding conversions. In the current SFF Under the framework of -8472, it is compatible with optical module products of various specifications.

The calibration of the optical module signal can be indicated by enabling the register for the user to input the indicated value; different configurations/definitions can be performed by reading the indicated value stored in these registers, and compatibility with optical module products of different specifications can be achieved.

Finally, it should be noted that this embodiment is described in a progressive manner, and different parts can be referred to each other; in addition, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limit them; although the present invention is described with reference to the foregoing embodiments After a detailed description, those skilled in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the corresponding The essence of the technical solution deviates from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

An optical module, comprising:

A circuit board, one end of the circuit board is provided with a golden finger;

The MCU is set on the circuit board and includes an I2C interface, the I2C interface is electrically connected to the I2C pin on the golden finger, and the MCU includes: a register storing an indication value input by the user, and the indication value is used to indicate the pair Calibration of optical module signals;

The signal processing unit is used to receive the level command signal from the host computer, and configure the transmission rate according to the level command signal, wherein:

When the indicated value is the first preset value, if the level command signal is in a high level state, the transmission rate will be calibrated to a high transmission rate; if the level command signal is in a low level state, the transmission rate will be Rate calibration for low transfer rates;

When the indicated value is the second preset value, if the level command signal is in a high level state, the transmission rate will be calibrated to a low transmission rate, and if the level command signal is in a low level state, the transmission rate will be The rate is calibrated for high transfer rates.
The optical module according to claim 1, wherein the indication value is read by the host computer;

When the indicated value is the first preset value, the host computer generates a corresponding level command signal, and the level command signal includes a high level state and a low level state;

When the indication value is the second preset value, the host computer generates a corresponding level command signal, and the level command signal includes a high level state and a low level state.
The optical module according to claim 1, wherein the register is a register in a user-writable area.
The optical module according to claim 1, wherein the indication value is 1 or 0;

When the indicated value is 1, if the level command signal is in a high level state, the transmission rate is calibrated to a high transmission rate, and if the level command signal is in a low level state, the transmission rate is calibrated to a low level Transmission rate;

When the indicated value is 0, if the level command signal is in a high level state, the transmission rate is calibrated to be a low transmission rate, and if the level command signal is in a low level state, the transmission rate is calibrated to be high Transmission rate.
The optical module according to claim 1, wherein the register is A0[64]bit6.
A method for calibrating an optical module signal, comprising:

storing the indication value in the register of the optical module, the indication value being used to indicate the calibration of the signal of the optical module;

Read the indication value through the host computer to calibrate the signal of the optical module;

Wherein, the level command signal is provided through the host computer, and the transmission rate is configured according to the level command signal;

When the indicated value is the first preset value, if the level command signal is in a high level state, the transmission rate will be calibrated to a high transmission rate; if the level command signal is in a low level state, the transmission rate will be Rate calibration for low transfer rates;

When the indicated value is the second preset value, if the level command signal is in a high level state, the transmission rate will be calibrated to a low transmission rate, and if the level command signal is in a low level state, the transmission rate will be The rate is calibrated for high transfer rates.
The calibration method according to claim 6, wherein,

When the indicated value is the first preset value, the host computer generates a corresponding level command signal, and the level command signal includes a high level state and a low level state;

When the indication value is the second preset value, the host computer generates a corresponding level command signal, and the level command signal includes a high level state and a low level state.
The calibration method according to claim 7, wherein the indication value is 1 or 0;

When the indicated value is 1, if the level command signal is in a high level state, the transmission rate is calibrated to a high transmission rate, and if the level command signal is in a low level state, the transmission rate is calibrated to a low level Transmission rate;

When the indicated value is 0, if the level command signal is in a high level state, the transmission rate is calibrated to be a low transmission rate, and if the level command signal is in a low level state, the transmission rate is calibrated to be high Transmission rate.
An optical module, comprising:

A circuit board, one end of the circuit board is provided with a golden finger;

The MCU is set on the circuit board and includes an I2C interface, the I2C interface is electrically connected to the I2C pin on the gold finger, and the MCU includes: a register, storing an indication value input by the user, and the indication value is used to indicate the pair Calibration of optical module signals;

Wherein, the registers include:

The first register, the indication value stored in the first register is the laser bias current calibration unit indication value, which is read by the host computer and used to calibrate the sampled value of the laser bias current;

The second register, the indication value stored in the second register is the indication value of the emission optical power calibration unit, which is read by the host computer and used to calibrate the emission optical power sampling value;

The third register, the indication value stored in the third register is the received optical power calibration unit indication value, which is read by the host computer and used to calibrate the received optical power sampling value.
The optical module according to claim 9, wherein the MCU further comprises:

The fourth register is used to store the sampling value of the laser bias current;

The fifth register is used to store the sampling value of the transmitted optical power;

The sixth register is used to store the sampled value of the received optical power.
The optical module according to claim 9, wherein the first register, the second register and the third register are registers in a user-writable area.
The optical module according to claim 10, wherein the storage in the first register, the second register, the third register, the fourth register, the fifth register and the sixth register The data is read by the host computer;

The host computer respectively reads the sampled value of the laser bias current and the indication value of the laser bias current calibration unit from the fourth register and the first register, and obtains the reported value of the laser bias current based on the first formula ;

The host computer respectively reads the transmitted optical power sampling value and the transmitted optical power calibration unit indication value from the fifth register and the second register, and obtains the transmitted optical power reported value based on the second formula;

The host computer respectively reads the received optical power sampling value and the received optical power calibration unit indication value from the sixth register and the third register, and obtains a received optical power reported value based on a third formula.
The optical module according to claim 12, wherein the host computer respectively reads the laser bias current sampling value and the laser bias current calibration unit indication value from the fourth register and the first register, And obtain the reported value of the laser bias current based on the first formula, including:

Obtain the laser bias current reported value according to TxBias=TX_BIAS_AD*TX_BIAS_U*0.001, where TxBias is the laser bias current reported value, TX_BIAS_AD is the laser bias current sampling value, TX_BIAS_U is the first laser bias current calibration unit or the second laser bias Set current calibration unit indication value.
The optical module according to claim 12, wherein the upper computer reads the sampled value of the transmitted optical power and the calibration unit indication value of the transmitted optical power from the fifth register and the second register respectively, and based on the second The formula obtains the reported value of the transmitted optical power, including:

According to TxPower=10*Log10(TX_PWR_AD*TX_PWR_U*0.0001), the transmitted optical power report value is obtained, where TxPower is the transmitted optical power reported value, TX_PWR_AD is the transmitted optical power sampling value, and TX_PWR_U is the transmitted optical power calibration unit indication value.
The optical module according to claim 12, wherein the host computer reads the received optical power sampling value and the received optical power calibration unit from the sixth register and the third register respectively, and obtains the received optical power based on the third formula Received optical power reported value, including:

According to RxPower=10*Log10(RX_PWR_AD*RX_PWR_U*0.0001), the received optical power reported value is obtained, where RxPower is the received optical power reported value, RX_PWR_AD is the received optical power sampling value, and RX_PWR_U is the received optical power calibration unit indication value.
A method for calibrating an optical module signal, comprising:

storing the indication value in the register of the optical module, the indication value being used to indicate the calibration of the signal of the optical module;

Read the indication value through the host computer to calibrate the signal of the optical module;

in:

Based on the optical module product specification, the laser bias current calibration unit indication value is stored in the first register, and the laser bias current calibration unit indication value is read by the host computer for calibrating the laser bias current sampling value;

Based on the product specification of the optical module, storing the indicated value of the calibration unit of the transmitted optical power in the second register, the indicated value of the calibration unit of the transmitted optical power is read by the host computer for calibrating the sampling value of the transmitted optical power;

Based on the product specifications of the optical module, the received optical power calibration unit indication value is stored in the third register, and the received optical power calibration unit indication value is read by the host computer for calibrating the received optical power sampling value.
The calibration method according to claim 16, wherein the first register, the second register and the third register are registers in a user-writable area.
The calibration method according to claim 16, wherein calibrating the sampled value of the laser bias current comprises:

Obtain the reported value of the laser bias current according to TxBias=TX_BIAS_AD*TX_BIAS_U*0.001, where TxBias is the reported value of the laser bias current, TX_BIAS_AD is the sampling value of the laser bias current, and TX_BIAS_U is the calibration of the laser bias current stored in the first register The unit indicates the value.
The calibration method according to claim 16, wherein calibrating the sampled value of the emitted optical power comprises:

According to TxPower=10*Log10(TX_PWR_AD*TX_PWR_U*0.0001), the transmitted optical power report value is obtained, wherein TxPower is the transmitted optical power reported value, TX_PWR_AD is the transmitted optical power sampling value, and TX_PWR_U is the transmitted optical power stored in the second register The calibration unit indicates the value.
The calibration method according to claim 16, wherein calibrating the received optical power sampling value comprises:

Obtain the received optical power reported value according to RxPower=10*Log10(RX_PWR_AD*RX_PWR_U*0.0001), wherein RxPower is the received optical power reported value, RX_PWR_AD is the received optical power sampling value, and RX_PWR_U is the received optical power stored in the third register The calibration unit indicates the value.