CN113824493A

CN113824493A - Optical module adjusting method, electronic device, apparatus, system and storage medium

Info

Publication number: CN113824493A
Application number: CN202010567691.9A
Authority: CN
Inventors: 苏展; 朱能念
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-12-21

Abstract

The embodiment of the invention provides an adjusting method of an optical module, which comprises the following steps: acquiring first incident light power of a first optical module, and a signal-to-noise ratio and an error rate of a first signal; under the condition that the first incident light power is not within the first power range, adjusting the emitted light power of the second light module; under the condition that the first incident light power is within a first power range and the signal-to-noise ratio of the first signal is smaller than or equal to a first threshold value, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module; and under the condition that the first incident light power is within a first power range and the signal-to-noise ratio of the first signal is greater than a first threshold value, adjusting the temperature of the laser in the second optical module according to a first temperature adjustment step length and the error rate of the first signal. The invention solves the technical problem that the optical module is sensitive to the zero dispersion point distribution of the optical fiber in actual transmission, and achieves the technical effect of self-adaptive adjustment of dispersion in the optical module.

Description

Optical module adjusting method, electronic device, apparatus, system and storage medium

Technical Field

The embodiment of the invention relates to the field of communication, in particular to an optical module adjusting method, electronic equipment, an apparatus, a system and a storage medium.

Background

With the development of networks, the rate class per wavelength of the current optical fiber communication system has been developed to a baud rate 53Gbd of a single wavelength of a 100G four-level pulse Amplitude Modulation signal (4plus Amplitude Modulation, abbreviated as PAM 4). According to the basic principle of optical fiber communication, when the baud rate is doubled, the dispersion tolerance is changed into the original 1/4, the theoretical reference zero chirp dispersion tolerance of 50G baud rate grade is compressed to about +/-32 ps/nm, and thus the dispersion limited distance obtained by conversion according to the dispersion coefficient is smaller and smaller.

TABLE 1 definition of fiber parameters in IEEE 802.3cn protocol

Description of the invention	Value of	Unit of
			Normal optical fiber specification wavelength	1310	nm
Attenuation coefficient (maximum value) of optical fiber	0.47^aOr 0.5^b	db/km
			0 scattered wavelength (lambda)₀)	1300≤λ₀≤1324	nm
Dispersion slope (maximum) (S)₀)	0.093	Psnm²km

According to the definition of the fiber parameters in the IEEE protocol, the two extremes of the zero dispersion point are 1300nm and 1324nm, respectively, with an ideal center value of 1312nm, as shown in Table 1.

TABLE 2 description of different transmission dispersions in the IEEE 802.3cn protocol

The dispersion extremum analysis in the IEEE protocol is shown in table 2. From the dispersion extremum and the transmission distance in table 2, the dispersion coefficient curve distribution diagram based on the IEEE standard shown in fig. 1 can be obtained, and the dispersion coefficient extremum distribution is shown in fig. 1. It can be seen from fig. 1 that there is uncertainty in the variation of the dispersion coefficient with wavelength. This is because the same optical module with fixed wavelength will encounter optical fiber with uncertain actual zero dispersion point and dispersion coefficient, and only needs to compress the wavelength range in the traditional low baud rate system. As can be seen from fig. 1, in a high-bitrate long-distance transmission system, the uncertainty of the dispersion coefficient of the optical fiber is more and more sensitive. Due to the increasingly narrow dispersion tolerance of a high-baud-rate system and the uncertainty of dispersion coefficient distribution, the transmission distance of the dispersion-limited system is more and more sensitive to the distribution of zero dispersion points of the optical fiber, and the formulation of incoherent optical module protocols of 100G-ER 140 km specifications and the like and the development of high-baud-rate optical modules are seriously hindered. Taking 100G PAM4 as an example, the wavelength variation range is almost compressed to an extreme value when the transmission distance is 30km, and the wavelength cannot be estimated according to the related art under the standard that the transmission distance is 40 km. Therefore, in the related art, the optical module cannot adaptively adjust the wavelength.

Aiming at the technical problem that an optical module is sensitive to the zero dispersion point distribution of optical fibers in actual transmission in the related technology, an effective technical scheme is not provided yet.

Disclosure of Invention

The embodiment of the invention provides an optical module adjusting method, electronic equipment, an electronic device, an optical module adjusting system and a storage medium, and at least solves the technical problem that an optical module is sensitive to zero dispersion point distribution of optical fibers in actual transmission in the related technology.

According to an embodiment of the present invention, there is provided a method for adjusting an optical module, including: acquiring a first performance parameter of a first optical module, wherein the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module; under the condition that the first incident light power is not within a first power range, adjusting the emitted light power of the second light module; when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module; determining a first temperature adjustment step length when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold; and adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the error rate of the first signal.

In an exemplary embodiment, the adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal includes: repeatedly performing the following steps until a current count value is greater than or equal to a second threshold value, wherein a current bit error rate is initialized to the bit error rate of the first signal, a current temperature adjustment step is initialized to the first temperature adjustment step, the current count value is initialized to an initial count value, and the initial count value is smaller than the second threshold value: controlling the temperature of a laser in the second optical module to increase the current temperature adjustment step length to obtain an adjusted temperature; controlling the laser to send a signal to the first optical module at the adjusted temperature to obtain a second performance parameter of the first optical module, wherein the second performance parameter includes an error rate of a second signal received by the first optical module from the second optical module, and the second signal is a signal sent by the laser at the adjusted temperature; keeping the current temperature adjustment step length unchanged and setting the current error rate as the error rate of the second signal under the condition that the current count value is smaller than the second threshold and the error rate of the second signal is smaller than the current error rate; and when the current count value is smaller than the second threshold value and the error rate of the second signal is larger than or equal to the current error rate, setting the current temperature adjustment step length as a second temperature adjustment step length opposite to the sign of the current temperature adjustment step length, increasing the current count value, and setting the current error rate as the error rate of the second signal, wherein the absolute value of the second temperature adjustment step length is smaller than or equal to the absolute value of the current temperature adjustment step length.

In an exemplary embodiment, the adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal includes: repeatedly performing the following steps until a current bit error rate is less than or equal to a first bit error rate threshold, wherein the current bit error rate is initialized to the bit error rate of the first signal, the first bit error rate threshold is less than the bit error rate of the first signal, and a current temperature adjustment step size is initialized to the first temperature adjustment step size: controlling the temperature of a laser in the second optical module to increase the current temperature adjustment step length to obtain an adjusted temperature; controlling the laser to send a signal to the first optical module at the adjusted temperature to obtain a third performance parameter of the first optical module, wherein the third performance parameter includes an error rate of a third signal received by the first optical module from the second optical module, and the third signal is a signal sent by the laser at the adjusted temperature; when the error rate of the third signal is greater than the first error rate threshold and less than the current error rate, keeping the current temperature adjustment step unchanged, and setting the current error rate as the error rate of the third signal; and when the error rate of the third signal is greater than or equal to the current error rate, setting the current temperature adjustment step length as a second temperature adjustment step length with the sign opposite to that of the current temperature adjustment step length, and setting the current error rate as the error rate of the third signal, wherein the absolute value of the second temperature adjustment step length is less than or equal to that of the current temperature adjustment step length.

In one exemplary embodiment, the method further comprises: and under the condition that the current count value is greater than or equal to the second threshold value and the error rate of the second signal received by the first optical module from the second optical module is smaller than a second error rate threshold value, controlling the second optical module to send a closing instruction to the first optical module, where the closing instruction is used to instruct the first optical module to switch from a reset state to a reset state, the first optical module is set to send performance parameters to the second optical module according to a preset period in the reset state, and the performance parameters sent according to the preset period include the first performance parameters and the second performance parameters.

In an exemplary embodiment, before the obtaining the first performance parameter of the first light module, the method further comprises: receiving a reset releasing command sent by the first optical module when an error rate of a fourth signal determined by the first optical module according to the fourth signal received by the second optical module is greater than a third error rate threshold, wherein the reset releasing command is used for instructing the second optical module to switch from the reset state to the reset releasing state, the second optical module is set to initialize a parameter of a transmitter in the second optical module in the reset releasing state, and the third error rate threshold is greater than the second error rate threshold; the acquiring a first performance parameter of a first optical module includes: receiving the first performance parameter sent by the first optical module according to the preset period; after the obtaining of the first performance parameter of the first light module, the method further comprises: and storing the first performance parameter in a target register of the second optical module.

In an exemplary embodiment, the adjusting the emitted optical power of the second light module includes: adjusting the emitted light power of the second optical module to enable the error rate of a fifth signal to be smaller than a target error rate threshold, wherein the fifth signal is a signal sent to the first optical module by the second optical module after the emitted light power of the second optical module is adjusted; the adjusting of the linearity and/or the intersection point of the eye pattern corresponding to the transmission signal of the second optical module includes: adjusting linearity and/or intersection points of an eye pattern corresponding to a transmission signal of the second optical module to enable an error rate of a sixth signal to be smaller than the target error rate threshold, wherein the sixth signal is a signal transmitted to the first optical module by the second optical module after adjusting the linearity and/or intersection points of the eye pattern corresponding to the transmission signal of the second optical module.

In an exemplary embodiment, the adjusting the transmission optical power of the second optical module to make the error rate of the fifth signal less than the target error rate threshold includes: adjusting a bias current of a transmitter in the second optical module, wherein the fifth signal comprises a signal sent by the second optical module to the first optical module after adjusting the bias current of the transmitter in the second optical module, and/or adjusting an optical power adjustment sub-component in the second optical module, wherein the fifth signal comprises a signal sent by the second optical module to the first optical module after adjusting the optical power adjustment sub-component in the second optical module.

In an exemplary embodiment, the adjusting the linearity and/or the intersection point of the eye pattern corresponding to the transmission signal of the second optical module so that the error rate of the sixth signal is smaller than the target error rate threshold includes: adjusting the linearity of the eye pattern by adjusting a digital signal processing chip in the second optical module, wherein the sixth signal comprises a signal sent to the first optical module by the second optical module after the digital signal processing chip is adjusted; and/or adjusting the cross-point by adjusting a driver in the second optical module, wherein the sixth signal comprises a signal sent by the second optical module to the first optical module after adjusting the driver.

In an exemplary embodiment, the obtaining the first performance parameter of the first light module includes: and after the first optical module receives the first performance parameter reported by a first line card, the first optical module sends the first performance parameter to the second optical module, wherein the first line card is connected with the first optical module through an electrical interface.

According to another embodiment of the invention, there is provided an electronic device including one or more processors and memory having one or more programs stored therein, which when executed by the processors, cause the electronic device to perform the steps of: acquiring a first performance parameter of a first optical module, wherein the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module; under the condition that the first incident light power is not within a first power range, adjusting the emitted light power of the second light module; when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module; determining a first temperature adjustment step length when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold; and adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the error rate of the first signal.

In an exemplary embodiment, the one or more programs, when executed by the processor, further cause the electronic device to adjust the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal by: repeatedly performing the following steps until a current count value is greater than or equal to a second threshold value, wherein a current bit error rate is initialized to the bit error rate of the first signal, a current temperature adjustment step is initialized to the first temperature adjustment step, the current count value is initialized to an initial count value, and the initial count value is smaller than the second threshold value: controlling the temperature of a laser in the second optical module to increase the current temperature adjustment step length to obtain an adjusted temperature; controlling the laser to send a signal to the first optical module at the adjusted temperature to obtain a second performance parameter of the first optical module, wherein the second performance parameter includes an error rate of a second signal received by the first optical module from the second optical module, and the second signal is a signal sent by the laser at the adjusted temperature; keeping the current temperature adjustment step length unchanged and setting the current error rate as the error rate of the second signal under the condition that the current count value is smaller than the second threshold and the error rate of the second signal is smaller than the current error rate; and when the current count value is smaller than the second threshold value and the error rate of the second signal is larger than or equal to the current error rate, setting the current temperature adjustment step length as a second temperature adjustment step length opposite to the sign of the current temperature adjustment step length, increasing the current count value, and setting the current error rate as the error rate of the second signal, wherein the absolute value of the second temperature adjustment step length is smaller than or equal to the absolute value of the current temperature adjustment step length.

According to still another embodiment of the present invention, there is provided an adjusting apparatus of a light module, including: an obtaining module, configured to obtain a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module; the first adjusting module is used for adjusting the emitted light power of the second light module under the condition that the first incident light power is not within a first power range; the second adjusting module is configured to adjust linearity and/or a cross point of an eye pattern corresponding to a transmission signal of the second optical module when the first incoming optical power is within the first power range and a signal-to-noise ratio of the first signal is less than or equal to a first threshold; the determining module is configured to determine a first temperature adjustment step size when the first incident light power is within the first power range and a signal-to-noise ratio of the first signal is greater than the first threshold; and the third adjusting module is used for adjusting the temperature of the laser in the second optical module according to the first temperature adjusting step length and the error rate of the first signal.

According to still another embodiment of the present invention, there is also provided an adjustment system of a light module, including: the optical module comprises a first optical module and a second optical module, wherein the second optical module comprises an acquisition module, a first adjusting module, a second adjusting module and a third adjusting module; the obtaining module is configured to obtain a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module; the first adjusting module is used for adjusting the emitted light power of the second optical module when the first incident light power is not within a first power range; the second adjusting module is configured to adjust linearity and/or a cross point of an eye pattern corresponding to a transmission signal of the second optical module when the first incoming optical power is within the first power range and a signal-to-noise ratio of the first signal is less than or equal to a first threshold; the determining module is configured to determine a first temperature adjustment step size when the first incident light power is within the first power range and a signal-to-noise ratio of the first signal is greater than the first threshold; and the third adjusting module is used for adjusting the temperature of the laser in the second optical module according to the first temperature adjusting step length and the error rate of the first signal.

According to a further embodiment of the present invention, there is also provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.

According to the invention, a first performance parameter of a first optical module is obtained, wherein the first performance parameter comprises a first incident light power of the first optical module, and a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module; under the condition that the first incident light power is not within a first power range, adjusting the emitted light power of the second light module; when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module; determining a first temperature adjustment step length when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold; and adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the error rate of the first signal. Therefore, the technical problem that an optical module is sensitive to the zero dispersion point distribution of the optical fiber in actual transmission in the related technology can be solved, and the technical effect of self-adaptive adjustment of dispersion in the optical module is achieved.

Drawings

FIG. 1 is a graph of dispersion coefficient curves based on the IEEE standard in the related art;

fig. 2 is a block diagram of a hardware structure of an electronic apparatus according to an embodiment of the present invention;

fig. 3 is a network architecture diagram of an adjusting method of an optical module according to an embodiment of the present invention;

fig. 4 is a flowchart of an adjustment method of a light module according to an embodiment of the present invention;

FIG. 5 is a flow chart of a remote optical module self-test method according to an embodiment of the present invention;

fig. 6 is a flowchart of an adjusting method of a light module according to another embodiment of the present invention;

FIG. 7 is a graph of a worst-case dispersion analysis for a dispersion limited system of the related art;

fig. 8 is a network architecture diagram of an adjusting method of an optical module according to another embodiment of the present invention;

FIG. 9 is a flowchart of a remote optical module self-checking method according to another embodiment of the present invention

Fig. 10 is a flowchart of an adjusting method of a light module according to still another embodiment of the present invention;

fig. 11 is a block diagram of an adjusting apparatus of an optical module according to an embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in conjunction with the embodiments.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The method embodiments provided in the embodiments of the present application may be executed in a mobile terminal, a computer terminal, or a similar computing device. Taking the electronic device as an example, fig. 2 is a block diagram of a hardware structure of an electronic apparatus according to an embodiment of the present invention. As shown in fig. 2, the electronic apparatus may include one or more (only one is shown in fig. 2) processors 102 (the processors 102 may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), and a memory 104 for storing data, wherein the electronic apparatus may further include a transmission device 106 for communication function and an input-output device 108. It will be understood by those skilled in the art that the structure shown in fig. 2 is only an illustration and is not intended to limit the structure of the electronic device. For example, the electronic device may also include more or fewer components than shown in FIG. 2, or have a different configuration than shown in FIG. 2.

The memory 104 may be used to store a computer program, for example, a software program of an application software and a module, such as a computer program corresponding to the adjusting method of the optical module in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, so as to implement the method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the electronic device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider. In one example, the transmission device 106 includes a Network adapter (NIC) that can be connected to other Network devices to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.

The embodiment of the present application may operate on the network architecture shown in fig. 3, as shown in fig. 3, the network architecture includes: the far-end optical module 100 and the near-end optical module 300 are connected through a passive optical fiber network 200, wherein the near-end optical module 300 gates and communicates with the far-end optical module 100 through a first port of the passive optical fiber network 200. The far-end optical modules 100 are electrically connected to the line cards 000, and the near-end optical modules are electrically connected to the line cards 400. The remote optical module includes a Digital Signal Processing (DSP) chip/Clock Data Recovery (CDR) chip 120 electrically connected to the line card 000, a mirror register (i.e., a target register in the above embodiments), a transmitter 110, where the transmitter 110 is connected to a hot spot cooler (TEC) 111 and a Microcontroller (MCU) 130. The structure of the near-end optical module 300 is the same as that of the far-end optical module 100, wherein the near-end optical module 300 includes a receiver 320, an extended mirror register 310 (i.e. the target register in the above embodiment), and an address 1(311), an address 2(312), and an address 3(313) in the extended mirror register 310 are respectively used for storing the performance parameters sent by the far-end optical module, and the near-end optical module 300 is connected to the line card 400 through an electrical interface. In an exemplary embodiment, the extended mirror register 310 is an additional Random Access Memory (RAM) storage area different from the requirement of the conventional optical module, where the address 1(311), the address 2(312), and the address 3(313) correspond to a first mirror register, a second mirror register, and a third mirror register, respectively, that is, the extended mirror register 310 includes a first mirror register, a second mirror register, and a third mirror register; the first mirror image register, the second mirror image register and the third mirror image register are respectively used for storing the ROP, the BER and the SNR fed back by the remote optical module. The data in the register is continuously refreshed, so that the near-end optical module can quickly inquire the data of the far-end optical module, and time-consuming response of the far-end optical module is not needed.

The far-end optical module 100 and the near-end optical module apparatus 300 are opposite to each other in terms of the so-called near-end and far-end, and the optical modules have the same structure. When the near-end optical module reports the performance parameters to the far-end optical module, the far-end optical module can optimize the sending performance of the far-end optical module according to the received performance parameters, and the far-end optical module can also report the performance parameters to the near-end optical module for optimized transmission.

The far-end optical module 100 is connected to the passive multiplexer/demultiplexer device 220 to realize access to a passive optical network, the passive multiplexer/demultiplexer device 220 is connected with the passive multiplexer/demultiplexer device 230 through an optical fiber 210, and the passive multiplexer/demultiplexer device 230 is connected with the near-end optical module 300.

In the network architecture, there may be N far-end optical modules and N near-end optical modules, that is, according to the number N of ports of the passive network, there may be multiple sets of near-end and far-end optical modules. For example, there may be a remote second optical module, and a near-end second optical module that gates and communicates through a second port of the passive optical network 200, where N is a positive integer. N may also be 1, that is, the passive multiplexer/

demultiplexer devices

220 and 230 are not used, and the far-end optical module 100 and the near-end optical module 300 are directly connected point-to-point through optical fibers.

Wherein N is a positive integer greater than or equal to 2.

In this embodiment, an adjusting method for an optical module operating in the network architecture is provided, and fig. 4 is a flowchart of the adjusting method for the optical module according to the embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:

step S302, obtaining a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module;

step S304, adjusting the emitted optical power of the second optical module when the first incident optical power is not within a first power range;

step S306, when the first incident light power is in the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting linearity and/or a cross point of an eye pattern corresponding to a transmission signal of the second optical module;

step S308, determining a first temperature adjustment step size when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold;

and step S3010, adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the error rate of the first signal.

Through the steps, a first performance parameter of a first optical module is obtained, wherein the first performance parameter comprises a first light incident power of the first optical module, and a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module; under the condition that the first incident light power is not within a first power range, adjusting the emitted light power of the second light module; when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module; determining a first temperature adjustment step length when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold; and adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the error rate of the first signal. Therefore, the technical problem that an optical module is sensitive to the zero dispersion point distribution of the optical fiber in actual transmission in the related technology can be solved, and the technical effect of self-adaptive adjustment of dispersion in the optical module is achieved.

In the embodiment of the present invention, the first optical module and the second optical module may be high-wavelength long-range optical modules (including, but not limited to, optical modules of the 100G PAM 440 km standard). By the embodiment, the wavelength of the laser in the second optical module can be adjusted towards the dispersion optimization direction (namely towards the direction with low dispersion cost) according to the error rate of the received signal fed back by the first optical module, so that the problem that the optical module (such as a high-baud-rate long-distance optical module) is sensitive to the actual optical fiber zero dispersion point can be solved, the transmission distance with limited dispersion of the optical module is optimized (namely the expansion of the transmission distance is realized), and the technical effect of prolonging the service life of the optical module is achieved.

It should be noted that the second optical module may be the near-end optical module 300 in fig. 2, and the first optical module may be the far-end optical module 100 in fig. 2, where the meaning of the far end and the near end is opposite, and the structures of the first optical module and the second optical module may be the same. In the above embodiment, since the temperature of the laser in the second optical module is adjusted according to the second error rate and the first temperature step, the adaptive adjustment of the wavelength in the second optical module is further realized, so that the dispersion in optical communication is reduced, and a better dispersion performance can be achieved.

The first power range in the embodiment of the present invention may be, but is not limited to, an optical power range corresponding to a specified error rate interval, that is, when the optical power is within the first power range, the error rate of a corresponding received signal is within the specified error rate interval, and the specified error rate interval may be an optimal or better error rate interval, for example, an error rate interval meeting a performance requirement of system signal transmission, so that the first power range is the optical power range capable of meeting the system transmission performance requirement. In one exemplary embodiment, the first power range is: interval range of (-3dBm, +1 dBm).

It should be noted that, in the above embodiments, the signs are opposite to each other to indicate that the signs of the two values are different in positive and negative, for example, the signs (or positive and negative) of a and B are opposite to each other, and when a is a positive number, B is a negative number; and if A is a negative number, then B is a positive number. In one exemplary embodiment, the setting the current temperature adjustment step size to a second temperature adjustment step size opposite in sign to the current temperature adjustment step size includes: setting the current temperature adjustment step length M as: -M/a, wherein a is a natural number greater than 1.

In the above-described embodiment, after the temperature of the laser in the second optical module is adjusted, a signal is transmitted from the second optical module to the first optical module, and obtaining the error rate fed back by the first optical module (i.e. the first optical module determines the error rate corresponding to the signal according to the signal received from the first optical module, and feeds back the error rate to the second optical module), where the error rate can reflect the dispersion performance of the optical signal emitted by the second optical module after temperature adjustment, and then continuously executing subsequent adjustment operation according to the error rate, so that the wavelength of the optical signal sent by the second optical module continuously tends to the actual dispersion point of the optical fiber connected with the second optical module, therefore, the transmission distance between the first optical module and the second optical module can be expanded, the self-adaptive optimization of the chromatic dispersion performance is realized, and the chromatic dispersion cost is reduced.

It should be noted that, in the above embodiment, when the current error rate is less than or equal to the first error rate threshold, it is described that the dispersion performance of the transmission signal of the second optical module has been optimized to a certain extent, and further, the temperature of the laser in the second optical module may not be adjusted any more. The first bit error rate threshold may be a preset bit error rate threshold, that is, the first bit error rate threshold may be set according to a dispersion performance requirement of the system.

It should be noted that, in the above embodiment, when the current count value is greater than or equal to the second threshold and the error rate of the second signal received by the first optical module from the second optical module is smaller than a second error rate threshold, it is described that the dispersion performance of the transmission signal of the second optical module has been optimized to a certain extent, so that the dispersion performance optimization process of the system can be ended, and the second optical module is controlled to transmit the close instruction to the first optical module. The second bit error rate threshold may be a preset bit error rate threshold, that is, the second bit error rate threshold may be set according to the dispersion performance requirement of the system.

It should be noted that, in the above embodiment, the fourth signal may be the first signal, that is, the fourth signal is the same signal as the first signal, so that the error rate of the fourth signal is equal to the error rate of the first signal. In an exemplary embodiment, the third bit error rate threshold is greater than the second bit error rate threshold, and the third bit error rate threshold is greater than the first bit error rate threshold. That is, in the above embodiment, the error rate of the transmission signal between the second optical module and the first optical module is optimized by adjusting the temperature of the laser in the second optical module, and thus, the optimization of the dispersion performance is achieved.

When the first optical module determines that the error rate of the fourth signal is greater than the third error rate, a reset-release command is sent to the second optical module to trigger the second optical module to start the adaptive adjustment function (that is, the second optical module is triggered to execute the adjustment method of the optical module in the embodiment of the present invention), and when the current count value is greater than or equal to the second threshold value and the error rate of the second signal received by the first optical module from the second optical module is less than the second error rate threshold value, the second optical module sends a close instruction to the first optical module.

In the embodiment of the present invention, when the first incident light power is not within the first power range, the error rate of the transmission signal between the first optical module and the second optical module is optimized by adjusting the emitted light power of the second optical module; and when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is smaller than or equal to a first threshold, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module to optimize the error rate of a transmission signal between the first optical module and the second optical module.

In an exemplary embodiment, the first error rate threshold, the second error rate threshold, the third error rate threshold, and the target error rate threshold may be thresholds set according to a dispersion transmission performance requirement (i.e., a system dispersion transmission performance requirement) between the second optical module and the first optical module, that is, may be preset thresholds. The first bit error rate threshold may be equal to the second bit error rate threshold, or the first bit error rate threshold is greater than the second bit error rate threshold, or the first bit error rate threshold is smaller than the second bit error rate threshold.

In an exemplary embodiment, the target bit error rate threshold is greater than or equal to the second bit error rate threshold and less than the third bit error rate threshold.

In the process, the second optical module first determines whether the first incident light power is within the first power range, and adjusts the emitted light power of the second optical module so that the fifth bit error rate is smaller than the target bit error rate threshold value when the first incident light power is not within the first power range; and under the condition that the first incident light power is within the first power range, continuously determining whether the signal-to-noise ratio of the first signal is smaller than or equal to the first threshold, under the condition that the signal-to-noise ratio of the first signal is smaller than or equal to the first threshold, adjusting the linearity and/or the cross point of an eye diagram corresponding to a transmission signal of the second optical module so that the error rate of a sixth signal is smaller than a target error rate threshold, and under the condition that the signal-to-noise ratio of the second signal is not smaller than the target error rate threshold, continuously adjusting the temperature of a laser in the second optical module according to the error rate of the signal after the last temperature adjustment, so that the dispersion performance of the transmission signal between the second optical module and the first optical module is optimized.

It should be noted that, in the above embodiment, when the signal transmitted by the second optical module is a PAM4 signal, the linearity of the signal output by the digital signal processing chip may be adjusted by adjusting the digital signal processing chip in the second optical module, that is, the linearity of the eye diagram is adjusted; and/or, when the signal output by the second optical module is a non return to zero (NRZ) signal, adjusting, by a driver in the second optical module, an intersection corresponding to the NRZ signal.

In one exemplary embodiment, the method further comprises: when the signal-to-noise ratio of the first signal is less than or equal to the first threshold, adjusting a pre-emphasis parameter of a transmitting-side eye pattern (i.e., an eye pattern corresponding to the transmitting signal of the second optical module in the above embodiment) stored in a register corresponding to a digital signal processing chip in the second optical module, so that an error rate of a seventh signal is less than the target error rate threshold, where the seventh signal is a signal transmitted to the first optical module by the second optical module after the pre-emphasis parameter of the transmitting-side eye pattern of the second optical module is adjusted.

It should be noted that, in the above embodiment, before the first optical module sends the first performance parameter to the second optical module, the first optical module obtains the first performance parameter from the line card connected to the first optical module through the electrical interface, and sends the first performance parameter to the second optical module after obtaining the first performance parameter.

In an exemplary embodiment, a bidirectional message channel is arranged between the first optical module and the second optical module, wherein data transmitted in the bidirectional message channel is modulated by a subcarrier; the acquiring a first performance parameter of a first optical module includes: and acquiring modulation data sent by the first optical module through the bidirectional message channel, wherein the modulation data is obtained by modulating the first performance parameter by adopting the subcarrier.

In the above embodiment, the bidirectional message channel is used to perform subcarrier modulation on a message on a main stream transmitted by an optical module to obtain a modulated message, and send and receive the modulated message between the optical modules, so that a very small amplitude affects service transmission exemplified by a PAM4 signal. In an exemplary embodiment, the messages transmitted in the bidirectional message channel include modulated BER, SNR, optical power, reset command, and shutdown commands.

The following explains the adjusting method of the optical module in the above embodiment with an example, but is not intended to limit the technical solution of the embodiment of the present invention.

In the embodiment of the present invention, in an optical fiber communication system, an optical module (for example, the second optical module in the above-mentioned embodiment) automatically adjusts a wavelength within an allowable range of optical power according to a performance parameter fed back by an opposite-end optical module (for example, the first optical module in the above-mentioned embodiment), that is, adjustment of a dispersion coefficient of the system is achieved, and a transmission parameter of the optical module can be optimized toward a zero dispersion point of an actual optical fiber, so that a dispersion cost is reduced, and an error rate is automatically optimized, so that a better dispersion transmission performance can be obtained at a certain transmission distance, thereby expanding a transmission distance and prolonging a service life of the optical module.

In the embodiment of the present invention, a far-end optical module (that is, an opposite-end optical module in the above embodiment, or referred to as a receiving-end optical module) and a near-end optical module (that is, a sending-end optical module) are interconnected through an optical fiber network, and optimization of dispersion performance is achieved through an adaptive management plane. In the above embodiment, the first optical module may send the first performance parameter reported by the line card connected to the first optical module to the second optical module, so that when the optical module device does not have a DSP or a Forward Error Correction module built in the DSP cannot serve as a BER indicator source, the line card may serve as an optional information source for related parameters.

The near-end optical module can automatically check the performance of the near-end optical module and adjust various transmitting side parameters of the optical module according to performance parameters fed back by the far-end optical module, such as Bit Error Rate (BER), Signal Noise Ratio (SNR), and Received Optical Power (ROP), that is, the optimization direction can be intelligently judged according to the performance parameters fed back by the far-end optical module, the system can be checked in the best order, and the chromatic dispersion performance can be automatically optimized, that is, the self-adaptive optimization of chromatic dispersion of the optical module is realized, so that the optimization of the Bit Error rate of the near-end optical module and the far-end optical module is realized, and the transmission distance of the system with limited chromatic dispersion is equivalently expanded (for example, the distance of 8km is expanded to 10 km). In addition, in the embodiment of the present invention, when the BER is degraded due to aging of the optical module, the automatic optimization of the BER may be started by the adjusting method of the optical module in the embodiment of the present invention, so as to further achieve the purpose of prolonging the service life of the optical module (for example, when the service life of the optical module reaches 15 years, the service life of the optical module is prolonged to 17 years by automatically optimizing the BER).

In the embodiment of the present invention, the far-end optical module and the near-end optical module can transmit and receive messages in a message channel between the two optical modules by encoding of the micro control unit, that is, a bidirectional message channel is established between a transmitter of an optical module and a receiver of another optical module. The optical module includes a DSP chip for querying BER and SNR, and the DSP chip may store the received performance parameters, i.e., BER, SNR and ROP, sent by another optical module into a mirror register (i.e., a target register in the above embodiment) in the optical module when the optical module normally operates, for example, the BER, SNR and ROP are respectively stored into an address 1, an address 2 and an address 3 in the register, and the stored performance parameters are updated according to the latest received performance parameters. In the embodiment of the present application, the register for storing the performance parameter is a mirror register additionally extended in the optical module.

In this embodiment of the present invention, the far-end optical module determines a BER and/or an SNR from the received signal, and starts a self-test procedure when the BER exceeds a corresponding first BER threshold (the first BER threshold is the third bit error rate threshold in the above embodiment), or the SNR exceeds a corresponding first SNR threshold. In the embodiment of the present invention, the dispersion performance between the second optical module and the first optical module can be optimized to the greatest extent by the cooperation between the first optical module and the second optical module. In the self-checking process of the far-end optical module, the far-end optical module firstly determines whether the error rate is limited due to insufficient incident light power by determining whether the incident light power is in a first power range, and if the incident light power is not in the first power range, the far-end optical module enters the incident light power optimization process. In the far-end optical module optimization process, the far-end optical module optimizes the incident light power by controlling the SOA gain of the semiconductor optical amplifier; otherwise, a reset command is sent to the near-end optical module, and the first performance parameter of the far-end optical module is continuously sent to a mirror register of the near-end optical module through a bidirectional message channel for refreshing, for example, the far-end optical module sends BER, SNR, and ROP to the near-end optical module according to an update frequency of 1 ms. The near-end optical module replaces the performance parameters previously stored in the mirror registers of the near-end optical module with the newly received BER, SNR, and ROP.

The near-end optical module receives the reset-release command in the reset state, and then initializes (including initializing each parameter of the transmitter), then, it is determined whether the received optical power (i.e. the first incident optical power in the above embodiment) of the far-end optical module stored in the mirror register of the near-end optical module is within a first power range (the first power range is the normal incident optical power range of the far-end optical module, and it can be determined whether the first incident optical power is normal through the first power range; in an exemplary embodiment, the first power range is the incident optical power range corresponding to the optimal error rate interval, for example, the interval range of (-3dBm, +1dBm) — in an exemplary embodiment, the first power range can also be set according to the transmission performance requirement of the system), and if the incident light power is not in the first power range, entering a transmitting light power optimization process of the near-end optical module. If the optical power is in the first power range, the SNR (i.e. the signal-to-noise ratio of the first signal in the above embodiment) is obtained from the mirror image register, and whether the SNR is normal is detected, and if the SNR is normal, then the process of optimizing the eye diagram linearity or the cross point at the transmitting side of the near-end optical module is performed. And if the SNR is abnormal, entering a dispersion optimization process of a near-end optical module. After the near-end optical module completes the dispersion optimization process (i.e., when the current count value in the above embodiment is greater than or equal to the second threshold), the near-end optical module performs other parameter self-tests, such as detecting whether the far-end optical power exceeds the standard, and detecting whether the BER or SNR sent by the far-end optical module is smaller than the second bit error rate threshold or the signal-to-noise ratio threshold, and when the BER is smaller than the second bit error rate threshold, sends a function shutdown command (i.e., an optical ratio instruction in the above embodiment) to the far-end optical module, and then the near-end optical module returns to the reset state.

Wherein the second threshold error rate is smaller than the third threshold error rate, for example, the third threshold error rate is 5E-5 (i.e. 5 x 10)^-5) The second threshold bit error rate is 1E-5 (i.e. 1 x 10)^-5). Therefore, the second error rate threshold value and the third error rate threshold value form hysteresis comparison, and therefore false triggering can be prevented.

Fig. 5 is a flowchart of a remote optical module self-test method according to an embodiment of the present invention, and as shown in fig. 5, the method includes the following steps:

step 1000: the far-end optical module determines whether a BER (i.e., an error rate of the fourth signal in the above embodiment) or an SNR index at the far-end receiving side exceeds a standard, and if so, performs a solution reset and executes step 1001;

in the embodiment of the invention, the BER or SNR index exceeding the standard is used as the only condition for starting the self-checking function of the remote optical module;

step 1001: performing incident light power detection, namely judging whether the incident light power is in a first power range, namely whether self-detection is that the error rate exceeds the standard due to insufficient incident light power, if so, executing step 1021, otherwise, executing step 1011;

step 1011: the far-end optical module performs light incidence power optimization;

the optimization of the incident light power can be performed by power components such as a receiver optical power adjusting component (such as a semiconductor optical amplifier and a PIN type photoelectric receiver (i.e., SOA + PIN)) in the integrated receiver, a Variable optical attenuator (VOA for short), and the like;

step 1021: sending a reset command to a near-end optical module;

step 1022: and reporting the bit error rate, the signal-to-noise ratio and the light incidence power to the near-end optical module in real time through a message channel in two directions.

In an exemplary embodiment, after step 1022 is executed, if the far-end optical module receives a function shutdown command (i.e., a shutdown instruction in the above embodiment) sent by the near-end optical module, the far-end optical module is restored to the reset state.

Fig. 6 is a flowchart of an adjusting method of a light module according to another embodiment of the present invention, as shown in fig. 6, the method includes the following steps:

step 3000: the near-end optical module is in a reset state;

step 3001: after receiving the reset command, initializing, namely setting all parameters of the transmitter to be in an initial state;

step 3002: determining whether the incident light power fed back by the far-end optical module is in a first power range, if so, executing step 3003, otherwise, executing step 3101;

step 3101: optimizing the emitted light power and returning to the step 3001;

the optimization of the emitted light power can be realized by optimizing the bias current of a transmitter in the near-end optical module or selectively optimizing an optical power adjusting sub-component (such as a semiconductor power amplifier (SOA)) in the near-end optical module;

step 3003: determining whether the signal-to-noise ratio fed back by the remote optical module exceeds a standard (i.e. determining whether the first signal-to-noise ratio is greater than a first threshold in the above embodiment), if so, performing step 3301, otherwise, performing step 3201;

step 3201: carrying out emission linearity adjustment or cross point adjustment;

step 3301: controlling the thermoelectric refrigerator to adjust the internal temperature of the laser according to the step M (i.e. adjusting the temperature of the laser in the second optical module by the step M in the above embodiment); wherein, M may be preset to a preset value, for example, M ═ 32; the preset value can be a positive number or a negative number, and when the preset value is the positive number, the temperature of the laser is controlled to increase the current temperature step length M, namely, the temperature rising operation is carried out; when the current temperature step length M is negative, controlling the temperature of the laser to increase by the current temperature step length M, and carrying out cooling operation;

step 3302: delaying for a certain time T1 (e.g., 200 ms);

the purpose of setting the time delay is to wait for the completion of the fine tuning of the wavelength after the temperature of the laser is adjusted;

step 3303: determining whether the error rate fed back by the remote optical module after the time T1 is reduced compared with the error rate fed back by the remote optical module last time, and whether the current count value C1 reaches a preset value (e.g., 5); if the error rate is reduced and the count value does not reach the set value, executing a step 3301 (namely, continuing to adjust the temperature by the step length M); if the bit error rate is not reduced and the count value does not reach the set value, go to step 3305; if the count value reaches the set value, go to step 3304;

in step 3303, it may be further determined whether the signal-to-noise ratio fed back by the remote optical module after time T1 is reduced compared with the signal-to-noise ratio fed back by the remote optical module last time;

when the C1 counter has accumulated to the set value, indicating that the proper resolution has been adjusted (i.e., the absolute value of M is decreased, i.e., the corresponding resolution is increased), and the bit error rate has been close to the optimal value, then proceed to self-test 3304;

step 3304: when the error rate fed back by the remote optical module last time is smaller than the second error rate threshold, sending a system shutdown command (i.e., a shutdown instruction in the above embodiment) to the remote optical module, and returning to step 3000 (i.e., returning to the reset state);

step 3305: m is set to M ═ M/2, and count C1 is incremented by 1, continuing with step 3301.

In the above embodiment, in step 3304, the near-end optical module may further perform self-check on other parameters, such as determining whether the light incident power of the far-end optical module is normal.

In addition, a timer T1 and a timer T2 are also present in the near-end optical module, and when the T1 timer is removed or a signal loss alarm is received, the process jumps from step 3001 to step 3000; in the event that the T2 timer expires or a loss of signal alarm is received, the process jumps from step 3301 to step 3001.

In the embodiment of the invention, the system dispersion coefficient is adjusted by using the feedback of the specified performance parameters, and the optimized dispersion transmission performance and the optimized system error rate can be carried out on the high-baud-rate section signals according to the zero dispersion point of the actual optical fiber in the system optical cable, thereby realizing the expansion of the transmission distance and prolonging the service life of the optical module. The embodiment of the invention can be applied to solve the problem that the same optical module is used but the system equipment with different geographic positions uses the dispersion unified management plane, so that the wavelength parameter of the transmitting end of the optical module equipment at two ends is optimized towards the direction with the minimum dispersion cost, and the invention not only can be applied to the system optimization of a high-baud optical module in an O-waveband point-to-point optical communication system, but also can be applied to the self-adaptive optimization of dispersion performance in the future optical module with higher baud rate, and the transmission distance is extended. In addition, according to the embodiment of the invention, the system can automatically optimize the dispersion performance to the adjustable BER optimal point according to the optical module equipment at two ends with different geographic positions, and does not need to manually adjust or replace the equipment; the theoretically optimal fiber post-sensitivity and longer service life can be obtained in the normal work of the optical module equipment; the transmission distance obtained in part of the high-baud-rate system is expanded relative to the dispersion limited distance originally separated by the IEEE protocol, and the dispersion coefficient sensitivity of the high-baud-rate O-band system to the distribution difference near a zero dispersion point is reduced.

Next, a method for adjusting the optical modules in the above embodiment will be described by taking as an example an optical module of which both the first optical module and the second optical module are 100G PAM 440 km standard.

The method in the embodiment of the present invention may be applied to a transmission system with a transmission distance exceeding 40km for adaptive dispersion management transmission, and may be applied to an optical module of 100G PAM 440 km QSFP28 type (for example, SOA + PIN receiver) and implement adaptive dispersion optimization thereof, that is, the first optical module and the second optical module are both optical modules of 100G PAM 440 km QSFP28 type.

According to the IEEE's dispersion analysis formula of table 2, the worst-case dispersion analysis for a high-bitrate long-distance system single-channel 100G PAM 430 km specification transmission is shown in table 3. It can be seen that the wavelength definition of the single wavelength 100G PAM 430 km system, with ± 32ps/nm as the reference dispersion tolerance range, is compressed to a narrow, 1311.5nm-1312.8nm, as shown in fig. 7. But theoretically the transmission of 30km transmission distance can be realized by applying the original IEEE protocol formulation framework.

TABLE 3 wavelength Range Table Using IEEE Dispersion-wavelength analysis method 100G PAM 430 km (+ -32 ps/nm)

Besides 30km, 40km is also a requirement of application of medium-long distance standard, and 40km transmission can not calculate matched wavelength any more, and 40km protocol formulation has a great problem. Even longer distances are not possible on the original IEEE rules.

In the embodiment of the invention, a point-to-point O waveband optical fiber communication system with a self-adaptive dispersion management plane and 100G PAM 440 km or more than 40km can be realized. As shown in fig. 8, the network architecture includes a far-end optical module 100 (e.g., an optical module of 100G PAM 440 km QSFP28 specification in the present example), and a near-end optical module 300 (e.g., an optical module of 100G PAM 440 km QSFP28 specification in the present example) interconnected point-to-point through 40km optical fiber; the line card 000 and the far-end optical module 100 are interconnected through an electrical interface, and the line card 400 and the near-end optical module 300 are interconnected through an electrical interface. The near-end optical module 300 can intelligently judge the optimization direction by inquiring performance parameters such as the error rate, the signal-to-noise ratio and the received optical power fed back by the receiving far-end optical module 100, check the system in an optimal sequence, and adjust various transmitting side parameters of the near-end optical module 300, so that the optimization of the error rate performance of a transmission channel between the far-end optical module 100 and the near-end optical module 300 is realized, and the transmission distance with limited system dispersion is equivalently expanded, namely from 30km to 40 km; and when the far-end first module and the near-end optical module encounter an optical fiber with a large dispersion point deviation of 30km to 40km, the dispersion performance, SNR and BER of the system are all deteriorated, and the method in the embodiment of the invention can realize the optimal performance after the system is adjusted to the optical fiber with the dispersion point deviation of 30km to 40km, thereby realizing a stable transmission system from a point 40km to a point O waveband.

In the network architecture, a bidirectional message channel 210 is provided between the near-end optical module and the far-end optical module, the bidirectional message channel is implemented by performing subcarrier modulation transmission and reception on a main service flow through the optical module device, a very small amplitude affects service transmission taking a PAM4 signal as an example, and the bidirectional message channel is mainly used for transmitting BER, SNR and optical power, and function on and off notification information and the like.

In the optical module, the transmitter 110 for transmitting the compatible message channel and the receiver 320 for receiving the compatible message channel are included, the digital signal processing chip 120 is electrically connected with the line card through an electrical interface, the extended mirror register 310 is connected with all the above components and the line card, and the controller 130 is connected with all the above components and the line card.

The transmitter 110 compatible with message channel transmission comprises a thermoelectric cooler TEC111 for temperature control and a Laser 112; the transmitter 320 compatible with message channel reception includes a filter 321 for filtering noise, a semiconductor optical amplifier SOA 322 for performing optical power amplification, and a PIN type receiver 323.

The address 1(311), the address 2(312), and the address 3(313) in the extended mirror register 310 are respectively used for storing various performance parameters, where the address 1(311), the address 2(312), and the address 3(313) respectively correspond to a first mirror register, a second mirror register, and a third mirror register, that is, the extended mirror register 310 includes the first mirror register 311, the second mirror register 312, and the third mirror register 313. The first mirror image register 311, the second mirror image register 312, and the third mirror image register 313 are used for placing ROP, BER, and SNR transmitted by the remote optical module, respectively. The register data is continuously refreshed, so that the near-end optical module can quickly inquire the data of the far-end optical module, and time-consuming response of the far-end optical module is not needed.

In this embodiment, the optimization of the dispersion performance of the system is realized by the flow of each of the far-end optical module and the near-end optical module and its associated coordination mechanism. As shown in fig. 9, the far-end optical module is the only starting condition (i.e. the execution precondition) of the self-checking method of the far-end optical module in the embodiment of the present invention when the BER (i.e. the bit error rate of the signal received by the far-end optical module, corresponding to the bit error rate of the fourth signal in the above-mentioned embodiment) of the far-end receiving side exceeds the first threshold (i.e. the third bit error rate threshold in the above-mentioned embodiment, e.g. 5E-5) (i.e. step 1 in fig. 9), then after starting, whether the self-check is caused by that the optical power ROP is not in the range of-3 dBm < ROP < +1dBm (the range is the optical power range corresponding to the optimum ROP-BER bit error rate interval) or not leads to the bit error rate limitation (step 2 in figure 9), if the optical power ROP is not within the range of-3 dBm < ROP < +1dBm, the far-end optical module performs the optical power optimization procedure (i.e., step 3 in fig. 9). If the optical power ROP is in the range of-3 dBm < ROP < +1dBm, a reset release command is issued to the near-end optical module (i.e., step 4 in fig. 9), and relevant parameters of the far-end optical module, such as ROP, BER, SNR, etc., are continuously sent to the mirror register of the near-end optical module through the bidirectional message channel and are refreshed at 1ms intervals (i.e., step 5 in fig. 9). In an exemplary embodiment, after step 5 is executed, if the far-end optical module receives a function shutdown command (i.e., a shutdown instruction in the above embodiment) sent by the near-end optical module, the far-end optical module is restored to the reset state.

As shown in fig. 10, the near-end optical module is in a reset state by default (i.e., step 3000 in the figure), and the dispersion optimization function is not turned on. The initialization/standby after reset (i.e. step 3001 in the figure) is released (if T1 timer overflows or receiving side Loss of Signal (LOS) alarm, return to step 3000). In step 3002, it is determined that the received optical power ROP of the far-end optical module stored in the mirror register is abnormal, and the process enters the optical power optimization procedure of the near-end optical module (i.e. step 3101 in the figure). If the optical power is normal, the SNR is detected again (step 3003 in the figure), and if the SNR is normal (i.e. the signal-to-noise ratio of the first signal in the above embodiment is less than or equal to the first threshold), the near-end optical module eye linearity or cross-point optimization procedure is performed again (step 3201 in the figure). If the SNR is not normal, the dispersion optimization procedure of the near-end optical module is entered (i.e. steps 3301-3304 in the figure). After the dispersion optimization, the near-end optical module performs self-checking of other parameters (i.e., step 3305 in the figure), for example, it detects whether the far-end incident light power is in the first power range, and sends a function shutdown command to the far-end optical module under the shutdown condition (i.e., the error rate of the second signal in the above embodiment is less than the second error rate threshold) when the BER is optimized to the second threshold (e.g., 1E-5), and then returns to the reset state (i.e., it jumps to step 3000).

In the above embodiment, in step 3, the remote optical module adjusts the gain of the optical amplification through the bias current of the SOA in the SOA + PIN integrated receiver, and step 4 may be performed after the optimization.

Therein, the near-end optical module may be optimized by the bias current of the laser112 in the transmitter 110 in step 3101.

In the near-end optical module transmission eye pattern linearity or cross point optimization step 3201, parameters such as transmission side eye pattern (i.e., an eye pattern corresponding to the PAM4 signal) linearity adjustment or cross point (i.e., a cross point corresponding to the NRZ signal) adjustment, pre-emphasis of the transmission side eye pattern, and the like may be adjusted, and the transmission side optical module may return to the standby state after the adjustment.

In the near-end optical module dispersion optimization step 3301-3304, the near-end optical module controls the TEC temperature setting value to increase by a step size of M (e.g., M ═ 32) (i.e., step 3301 in fig. 10, where when M is a positive number, the increase step size is to perform a temperature rise operation, and when M is a negative number, the increase step size is to perform a temperature drop operation), and then the wavelength fine tuning is completed by delaying T1 ═ 200ms and the like (i.e., step 3302 in fig. 10), and then it is queried whether the new BER fed back by the far-end optical module is optimized (or whether SNR is optimized) or not (i.e., step 3303 in fig. 10), and if optimized, step 3301 is continuously performed (i.e., temperature adjustment is continuously performed by using M as a step size), the temperature adjustment direction of the temperature rise or drop is not changed (i.e., the same temperature rise or drop operation as the last time is performed), until BER degradation is detected. When the BER is degraded, the M step size is first adjusted to-M/a (where a is a positive integer greater than 1, i.e., M is recursively halved and inverted (i.e., the sign is inverted), e.g., when M is 32 before and a is 2 before, the adjusted M is-16), and then the change times counter C1 is incremented by 1 (i.e., step 3304 in fig. 10). Then in step 3301, the TEC is controlled to adjust the temperature according to the current M, then the delay T1 is 200ms to wait for the effect, if the error rate becomes better, the temperature is decreased with the current M as the step length, and if the error rate becomes worse, the halving recursion and reversal of the M value are performed again (i.e. M is set to-M/a again, at this time, the resolution of M is increased to M8), the C1 value is added to 1 again, when the C1 counter has accumulated to the preset number M of times to 5, the explanation is repeatedly adjusted to the very close optimal value, and then the self-checking step 3305 is performed.

In the embodiment of the invention, the first threshold value (5E-5) and the second threshold value (1E-5) form hysteresis comparison to prevent false triggering caused by repeated opening and closing of the function.

100G PAM 440 km transmission systems, if they employ IEEE's original fixed worst case dispersion limited analysis, the dispersion is outside the dispersion tolerance range and no reasonable wavelength range can be obtained. In the embodiment of the invention, the dispersion coefficient sensitivity of a 100G PAM 4O waveband long-distance system to the distribution difference near a zero dispersion point is reduced, so that the transmission distance of the equipment can be expanded from 30km to 40 km; the communication system can automatically optimize the dispersion performance to the adjustable BER optimal point according to the optical module equipment at two ends with different geographic positions, and does not need to manually adjust or replace the equipment; the optical module equipment can obtain the optimal fiber post-sensitivity and longer service life in normal work.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

In this embodiment, an adjusting apparatus for an optical module is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 11 is a block diagram of an adjusting apparatus of an optical module according to an embodiment of the present invention, and as shown in fig. 11, the apparatus includes

An obtaining module 1101, configured to obtain a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and a bit error rate of a first signal received by the first optical module from a second optical module;

a first adjusting module 1103, configured to adjust emitted optical power of the second optical module when the first incident optical power is not within a first power range;

a second adjusting module 1105, configured to adjust linearity and/or a cross point of an eye pattern corresponding to a transmission signal of the second optical module when the first optical power is in the first power range and a signal-to-noise ratio of the first signal is less than or equal to a first threshold;

a determining module 1107, configured to determine a first temperature adjustment step length when the first incident light power is in the first power range and a signal-to-noise ratio of the first signal is greater than the first threshold;

a third adjusting module 1109, configured to adjust the temperature of the laser in the second optical module according to the first temperature adjusting step length and the error rate of the first signal.

In the embodiment of the present invention, the first optical module and the second optical module may be high-wavelength long-range optical modules (including, but not limited to, optical modules of the 100G PAM 440 km standard). By the embodiment, the wavelength of the laser in the second optical module can be adjusted towards the dispersion optimization direction (namely towards the direction with low dispersion cost) according to the error rate of the received signal fed back by the first optical module, so that the problem that the optical module (such as a high-baud-rate long-distance optical module) is sensitive to the zero dispersion point of the actual optical fiber can be solved, the transmission distance with limited dispersion of the optical module is optimized (namely the expansion of the transmission distance is realized), and the service life of the optical module is prolonged

According to another embodiment of the invention, there is provided an electronic device comprising one or more processors and memory, the memory having stored therein one or more programs that, if executed by the processors, cause the electronic device to perform the steps of any of the above method embodiments.

In an exemplary embodiment, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.

In one exemplary embodiment, the one or more programs, when executed by the processor, cause the electronic device to perform the steps of:

step S1, obtaining a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module;

step S2, adjusting the emitted optical power of the second optical module when the first incident optical power is not within a first power range;

step S3, when the first incoming optical power is in the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting linearity and/or intersection of an eye pattern corresponding to a transmission signal of the second optical module;

step S4, determining a first temperature adjustment step size when the first incident light power is in the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold;

and step S5, adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

Embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the steps of any of the above-mentioned method embodiments when executed.

In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary embodiments, and details of this embodiment are not repeated herein.

It will be apparent to those skilled in the art that the various modules or steps of the invention described above may be implemented using a general purpose computing device, they may be centralized on a single computing device or distributed across a network of computing devices, and they may be implemented using program code executable by the computing devices, such that they may be stored in a memory device and executed by the computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into various integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical module adjustment method, comprising:

acquiring a first performance parameter of a first optical module, wherein the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module;

under the condition that the first incident light power is not within a first power range, adjusting the emitted light power of the second light module;

when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is less than or equal to a first threshold, adjusting the linearity and/or the intersection point of an eye pattern corresponding to a transmission signal of the second optical module;

determining a first temperature adjustment step length when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than the first threshold;

and adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the error rate of the first signal.

2. The method of claim 1, wherein adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal comprises:

repeatedly performing the following steps until a current count value is greater than or equal to a second threshold value, wherein a current bit error rate is initialized to the bit error rate of the first signal, a current temperature adjustment step is initialized to the first temperature adjustment step, the current count value is initialized to an initial count value, and the initial count value is smaller than the second threshold value:

controlling the temperature of a laser in the second optical module to increase the current temperature adjustment step length to obtain an adjusted temperature;

controlling the laser to send a signal to the first optical module at the adjusted temperature to obtain a second performance parameter of the first optical module, wherein the second performance parameter includes an error rate of a second signal received by the first optical module from the second optical module, and the second signal is a signal sent by the laser at the adjusted temperature;

keeping the current temperature adjustment step length unchanged and setting the current error rate as the error rate of the second signal under the condition that the current count value is smaller than the second threshold and the error rate of the second signal is smaller than the current error rate;

and when the current count value is smaller than the second threshold value and the error rate of the second signal is larger than or equal to the current error rate, setting the current temperature adjustment step length as a second temperature adjustment step length opposite to the sign of the current temperature adjustment step length, increasing the current count value, and setting the current error rate as the error rate of the second signal, wherein the absolute value of the second temperature adjustment step length is smaller than or equal to the absolute value of the current temperature adjustment step length.

3. The method of claim 1, wherein adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal comprises:

repeatedly performing the following steps until a current bit error rate is less than or equal to a first bit error rate threshold, wherein the current bit error rate is initialized to the bit error rate of the first signal, the first bit error rate threshold is less than the bit error rate of the first signal, and a current temperature adjustment step size is initialized to the first temperature adjustment step size:

controlling the laser to send a signal to the first optical module at the adjusted temperature to obtain a third performance parameter of the first optical module, wherein the third performance parameter includes an error rate of a third signal received by the first optical module from the second optical module, and the third signal is a signal sent by the laser at the adjusted temperature;

when the error rate of the third signal is greater than the first error rate threshold and less than the current error rate, keeping the current temperature adjustment step unchanged, and setting the current error rate as the error rate of the third signal;

and when the error rate of the third signal is greater than or equal to the current error rate, setting the current temperature adjustment step length as a second temperature adjustment step length with the sign opposite to that of the current temperature adjustment step length, and setting the current error rate as the error rate of the third signal, wherein the absolute value of the second temperature adjustment step length is less than or equal to that of the current temperature adjustment step length.

4. The method of claim 2, further comprising:

and under the condition that the current count value is greater than or equal to the second threshold value and the error rate of the second signal received by the first optical module from the second optical module is smaller than a second error rate threshold value, controlling the second optical module to send a closing instruction to the first optical module, where the closing instruction is used to instruct the first optical module to switch from a reset state to a reset state, the first optical module is set to send performance parameters to the second optical module according to a preset period in the reset state, and the performance parameters sent according to the preset period include the first performance parameters and the second performance parameters.

5. The method of claim 4,

before the obtaining of the first performance parameter of the first light module, the method further comprises: receiving a reset releasing command sent by the first optical module when an error rate of a fourth signal determined by the first optical module according to the fourth signal received by the second optical module is greater than a third error rate threshold, wherein the reset releasing command is used for instructing the second optical module to switch from the reset state to the reset releasing state, the second optical module is set to initialize a parameter of a transmitter in the second optical module in the reset releasing state, and the third error rate threshold is greater than the second error rate threshold;

the acquiring a first performance parameter of a first optical module includes: receiving the first performance parameter sent by the first optical module according to the preset period;

after the obtaining of the first performance parameter of the first light module, the method further comprises: and storing the first performance parameter in a target register of the second optical module.

6. The method of claim 1, wherein said adjusting the emitted optical power of the second light module comprises: adjusting the emitted light power of the second optical module to enable the error rate of a fifth signal to be smaller than a target error rate threshold, wherein the fifth signal is a signal sent to the first optical module by the second optical module after the emitted light power of the second optical module is adjusted;

the adjusting of the linearity and/or the intersection point of the eye pattern corresponding to the transmission signal of the second optical module includes: adjusting linearity and/or intersection points of an eye pattern corresponding to a transmission signal of the second optical module to enable an error rate of a sixth signal to be smaller than the target error rate threshold, wherein the sixth signal is a signal transmitted to the first optical module by the second optical module after adjusting the linearity and/or intersection points of the eye pattern corresponding to the transmission signal of the second optical module.

7. The method of claim 6, wherein adjusting the emitted optical power of the second optical module to make the error rate of the fifth signal less than a target error rate threshold comprises:

adjusting a bias current of a transmitter in the second optical module, wherein the fifth signal comprises a signal transmitted by the second optical module to the first optical module after adjusting the bias current of the transmitter in the second optical module, and/or

Adjusting an optical power adjustment sub-component in the second optical module, wherein the fifth signal includes a signal sent by the second optical module to the first optical module after the optical power adjustment sub-component in the second optical module is adjusted.

8. The method according to claim 6, wherein the adjusting the linearity and/or the intersection point of the eye pattern corresponding to the transmission signal of the second optical module so that the error rate of the sixth signal is smaller than the target error rate threshold value comprises:

adjusting the linearity of the eye pattern by adjusting a digital signal processing chip in the second optical module, wherein the sixth signal comprises a signal sent to the first optical module by the second optical module after the digital signal processing chip is adjusted; and/or the presence of a gas in the gas,

adjusting the cross-point by adjusting a driver in the second optical module, wherein the sixth signal comprises a signal transmitted by the second optical module to the first optical module after adjusting the driver.

9. The method of claim 1, wherein obtaining the first performance parameter of the first light module comprises:

and after the first optical module receives the first performance parameter reported by a first line card, the first optical module sends the first performance parameter to the second optical module, wherein the first line card is connected with the first optical module through an electrical interface.

10. An electronic device comprising one or more processors and memory, wherein one or more programs are stored in the memory, which when executed by the processors, cause the electronic device to perform the steps of:

11. The electronic device of claim 10, wherein the one or more programs, when executed by the processor, further cause the electronic device to adjust the temperature of the laser in the second optical module according to the first temperature adjustment step and the error rate of the first signal by:

12. An optical module adjusting apparatus, comprising:

an obtaining module, configured to obtain a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module;

the first adjusting module is used for adjusting the emitted light power of the second light module under the condition that the first incident light power is not within a first power range;

the second adjusting module is configured to adjust linearity and/or a cross point of an eye pattern corresponding to a transmission signal of the second optical module when the first incoming optical power is within the first power range and a signal-to-noise ratio of the first signal is less than or equal to a first threshold;

the determining module is configured to determine a first temperature adjustment step size when the first incident light power is within the first power range and a signal-to-noise ratio of the first signal is greater than the first threshold;

and the third adjusting module is used for adjusting the temperature of the laser in the second optical module according to the first temperature adjusting step length and the error rate of the first signal.

13. An adjustment system for a light module, comprising: the optical module comprises a first optical module and a second optical module, wherein the second optical module comprises an acquisition module, a first adjusting module, a second adjusting module and a third adjusting module;

the obtaining module is configured to obtain a first performance parameter of a first optical module, where the first performance parameter includes a first incident light power of the first optical module, a signal-to-noise ratio and an error rate of a first signal received by the first optical module from a second optical module;

the first adjusting module is used for adjusting the emitted light power of the second optical module when the first incident light power is not within a first power range;

14. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 9 when executed.