CN112397996B - Wavelength adjusting method and device and optical module - Google Patents

Abstract

The present invention provides a wavelength adjustment method, device and optical module. The method includes: acquiring the current wavelength value of the laser output beam of the optical module; comparing the current wavelength value with at least two preset wavelength values, and selecting the absolute value of the difference with the current wavelength value The minimum preset wavelength value is the target wavelength value; by adjusting the temperature of the temperature control unit of the optical module, the wavelength of the beam output by the laser is adjusted to the target wavelength value. By adopting this method, by adjusting the temperature of the temperature control unit, the wavelength of the beam output by the laser of the optical module can be adjusted to one of the preset wavelength values, so as to form a new transmission wavelength range and form a more optimized transmission wavelength range. In the prior art, the wavelength of the optical module is not adjustable or the wavelength is adjustable but the adjustment accuracy cannot meet the transmission requirements of larger wavelength capacity.

Description

Wavelength adjustment method, device and optical module

technical field

The present invention relates to the field of wireless technology, and in particular, to a wavelength adjustment method, device and optical module.

Background technique

5G networks need to support a variety of services and application scenarios, such as Enhanced Mobile Broadband (eMBB) services with higher bandwidth and lower latency, IoT mMTC (Massive Machine-Type Communication) services that support massive user connections, and Ultra-high reliability, ultra-low latency uRLLC (Ultra Reliable & Low Latency Communication), etc.

With the advent of 5G, the deployment of base stations is gradually based on an open platform-based real-time cloud infrastructure radio access network (Centralized, Cooperative & Cloud Radio Access Network, C-RAN), and the fronthaul network adopts Active antenna unit (Active antenna unit). , AAU) and distributed unit (Distributed Unit, DU) + centralized unit (Centralized Unit, CU) architecture. To avoid extensive use of fronthaul fibers, fronthaul networks usually implement fronthaul fiber multiplexing by combining and demultiplexing.

At present, wavelength division multiplexing (WDM) technology is usually used to transmit several wavelengths of colored light in the same optical fiber, and perform photoelectric conversion through optical modules, so as to effectively reduce the number of optical fibers required by the fronthaul network.

There are two types of optical modules in conventional technology, one is an optical module with non-adjustable wavelength, the wavelength of the optical signal emitted by the optical module is not adjustable and distributed in a preset interval; the other is an optical module with adjustable wavelength, The wavelength of the optical signal emitted by the optical module can be adjusted to the target wavelength, but the wavelength can only be adjusted with a certain accuracy.

However, in the transmission of the fronthaul network, it is usually required that the optical module can be divided into a finer wavelength range within a limited wavelength range to meet the needs of larger wavelength capacity transmission such as 5G fronthaul. None of the optical modules can meet this requirement.

SUMMARY OF THE INVENTION

The purpose of the technical solution of the present invention is to provide a wavelength adjustment method, device and optical module, which are used to solve the problem that the wavelength of the optical module in the prior art is not adjustable or the wavelength is adjustable but the adjustment accuracy cannot meet the transmission requirement of larger wavelength capacity.

An embodiment of the present invention provides a wavelength adjustment method, which is applied to an optical module, wherein the method includes:

obtaining the current wavelength value of the laser output beam of the optical module;

comparing the current wavelength value with at least two preset wavelength values, and selecting the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value;

By adjusting the temperature of the temperature control unit of the optical module, the wavelength of the light beam output by the laser is adjusted to the target wavelength value.

Optionally, the wavelength adjustment method, wherein the method further comprises:

When adjusting the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value for performing temperature adjustment on the temperature control unit are determined.

Optionally, the wavelength adjustment method, wherein when determining to adjust the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature of the temperature control unit are adjusted. temperature values, including:

When the target wavelength value is greater than the current wavelength value, determine that the adjustment mode is temperature rise adjustment;

When the target wavelength value is smaller than the current wavelength value, it is determined that the adjustment mode is cooling adjustment;

The adjusted temperature value is determined according to the predetermined correspondence between the temperature change and the wavelength value change.

Optionally, the wavelength adjustment method, wherein the method further comprises:

After the wavelength of the beam output by the laser is adjusted to the target wavelength value, obtain the current temperature value and the current configuration value of the temperature control unit;

The current configuration value is stored, and the current temperature value is stored as the configuration temperature of the temperature control unit.

Optionally, the wavelength adjustment method, wherein the method further comprises:

When the optical module is restarted, read the stored current configuration value;

The current configuration value is output to the temperature control unit, so that the temperature control unit is at the configuration temperature.

An embodiment of the present invention further provides a wavelength adjustment device, which is applied to an optical module, wherein the device includes:

a wavelength acquisition module for acquiring the current wavelength value of the laser output beam of the optical module;

a selection module, configured to compare the current wavelength value with at least two preset wavelength values, and select the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value;

The temperature adjustment module is configured to adjust the wavelength of the light beam output by the laser to the target wavelength value by adjusting the temperature of the temperature control unit of the optical module.

Optionally, in the wavelength adjustment device, the temperature adjustment module is further used for:

When adjusting the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value for performing temperature adjustment on the temperature control unit are determined.

Optionally, in the wavelength adjustment device, wherein the temperature adjustment module determines the adjustment method when adjusting the temperature of the temperature control unit when the wavelength of the beam output by the laser is adjusted to the target wavelength value. and adjusted temperature values, including:

When the target wavelength value is greater than the current wavelength value, determine that the adjustment mode is temperature rise adjustment;

When the target wavelength value is smaller than the current wavelength value, it is determined that the adjustment mode is cooling adjustment;

The adjusted temperature value is determined according to the predetermined correspondence between the temperature change and the wavelength value change.

Optionally, the wavelength adjustment device, wherein the device further comprises:

an acquisition module is configured to acquire the current temperature value and the current configuration value of the temperature control unit after the wavelength of the beam output by the laser is adjusted to the target wavelength value;

A storage module, configured to store the current configuration value, and store the current temperature value as the configuration temperature of the temperature control unit.

Optionally, the wavelength adjustment device, wherein the device further comprises:

a reading module for reading the stored current configuration value when the optical module is restarted;

The control module is configured to output the current configuration value to the temperature control unit, so that the temperature control unit is at the configuration temperature.

An embodiment of the present invention further provides an optical module, which includes: a processor, a memory, and a program stored on the memory and executable on the processor, and when the program is executed by the processor, the program implements the following: The wavelength adjustment method of any one of the above.

Optionally, the optical module, wherein the optical module is a sparse wavelength division multiplexing CWDM optical module, or a local area network-wavelength division multiplexing LAN-WDM optical module.

An embodiment of the present invention further provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, implements any of the wavelength adjustment methods described above. A step of.

At least one of the above-mentioned technical solutions of the present invention has the following beneficial effects:

In the wavelength adjustment method according to the embodiment of the present invention, by adjusting the temperature of the temperature control unit, the wavelength of the beam output by the laser of the optical module can be adjusted to one of the preset wavelength values, so as to form a new transmission wavelength band and form a more optimized wavelength It realizes the definition of more wavelength ranges, and solves the problem that the wavelength of the optical module in the prior art is not adjustable or the wavelength is adjustable but the adjustment accuracy cannot meet the transmission requirements of larger wavelength capacity.

Description of drawings

FIG. 1 is an implementation architecture diagram of an optical module applied to a fronthaul network deployed by a base station;

2 is a schematic flowchart of a wavelength adjustment method according to an embodiment of the present invention;

3 is a schematic structural diagram of a wavelength adjustment device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an optical module according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

The wavelength adjustment method described in the embodiment of the present invention is applied to an optical module. The function of the optical module is to realize photoelectric conversion. The transmitting end converts the electrical signal into an optical signal, and after transmission through the optical fiber, the receiving end converts the optical signal into an electrical signal.

Therefore, the optical module includes a transmitting device for optical signal transmission and a receiving device for optical signal reception. The transmitting device is specifically: the input electrical signal with a certain code rate is processed by the internal driver chip to drive the semiconductor laser LD or light-emitting diode LED to emit a modulated optical signal of the corresponding rate, and the internal optical power automatic control circuit can make the output. The power of the optical signal remains stable; the receiving device is specifically: an optical signal with a certain code rate is input and converted into an electrical signal by a photodetector diode, and an electrical signal with a corresponding code rate is output after a preamplifier.

As a key component in the transmission system, the optical module determines the performance of the optical transmission system to a large extent. Figure 1 shows an implementation architecture diagram of an optical module applied to a fronthaul network deployed by a base station. The fronthaul network can be an open wavelength division system. On the AAU side, through the optical module and passive WDM, the AAU output The electrical signal is converted into an optical signal, and the optical signals of different wavelengths sent by multiple optical modules are combined into one, and transmitted to the DU+CU side through the optical fiber; on the DU+CU side, the active WDM and optical modules can be used. Different optical information in an optical signal transmitted in the optical fiber of the network is split, converted into electrical signals, and then transmitted to the DU and/or CU.

According to the above structure, in the wireless fronthaul network, the optical module becomes the key device for service bearing. It should be noted that the implementation architecture of the optical module shown in FIG. 1 is only an example, and the system architecture applied to the optical module is not limited to only one of the forms, and it is not necessary to describe each possible one here. The implementation structure is given as an example.

In order to solve the problem that the wavelength of the optical module in the prior art is not adjustable or the wavelength is adjustable but the adjustment accuracy cannot meet the transmission requirement of larger wavelength capacity, the embodiment of the present invention provides a wavelength adjustment method. After the start-up, the wavelength of the output beam is within the predetermined range, and further wavelength precision adjustment is realized to form a more optimized transmission wavelength range, realize the definition of more wavelength ranges, and optimize the transmission index to achieve greater bandwidth and More cost-effective transmission.

Specifically, as shown in FIG. 2 , the wavelength adjustment method according to the embodiment of the present invention is applied to an optical module, and the method includes:

S210, obtaining the current wavelength value of the laser output beam of the optical module;

S220, comparing the current wavelength value with at least two preset wavelength values, and selecting the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value;

S230, by adjusting the temperature of the temperature control unit of the optical module, adjust the wavelength of the light beam output by the laser to the target wavelength value.

In the wavelength adjustment method according to the embodiment of the present invention, by adjusting the temperature of the temperature control unit, the wavelength of the beam output by the laser of the optical module can be adjusted to one of the preset wavelength values, so as to form a new transmission wavelength band and form a more optimized wavelength The transmission wavelength range can be used to achieve the definition of more wavelength ranges, optimize the transmission indication, and achieve the effect of larger bandwidth and more cost-effective transmission.

Optionally, in the wavelength adjustment method according to the embodiment of the present invention, the applied optical module is a sparse wavelength division multiplexer (Coarse Wavelength Division Multiplexer, CWDM) optical module, or a local area network-wavelength division multiplexer (Local Area Network-Wavelength) optical module. Division Multiplexing, LAN-WDM) optical module.

The above-mentioned CWDM optical module and LAN-WDM optical module are optical modules with non-adjustable wavelength of conventional technology. The optical module using the wavelength adjustment method described in the embodiment of the present invention monitors the wavelength value of the light beam output by the laser of the optical module, and passes the temperature. The adjustment method enables the optical module to form more and more optimized transmission wavelength ranges within a limited wavelength range to meet the needs of larger wavelength capacity transmission such as 5G fronthaul.

It should be noted that the optical module using the wavelength adjustment method according to the embodiment of the present invention is not limited to being applicable to the above-mentioned types of optical modules, for example, it can also be applied to a wavelength-tunable optical module. , through the temperature adjustment method, further wavelength precision adjustment can be achieved to form a more optimized transmission wavelength range.

In addition, it should be noted that in step S210, the current wavelength value of the beam output by the laser of the optical module can be obtained through measurement by using the center frequency characteristic of the laser beam emitted by the optical module.

Further, in step S220, the adjusted target wavelength value is determined by comparing the current wavelength value obtained by measurement in step S210 with at least two preset wavelength values. Specifically, the target wavelength value is the preset wavelength value with the smallest absolute value of the difference between the at least two preset wavelength values and the current wavelength value. That is, the center wavelength of the laser beam output by the laser needs to be adjusted to a preset wavelength value closer to the current wavelength value.

Optionally, the wavelength adjustment method according to the embodiment of the present invention further includes:

When adjusting the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value for performing temperature adjustment on the temperature control unit are determined.

Specifically, by comparing the target wavelength value with the current wavelength value, the wavelength value range to be adjusted is determined, and according to the determined wavelength value range to be adjusted, the adjustment method and the adjusted temperature when the temperature control unit is adjusted are determined. value.

Optionally, when determining to adjust the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value when the temperature control unit is temperature adjusted, including:

When the target wavelength value is greater than the current wavelength value, determine that the adjustment mode is temperature rise adjustment;

When the target wavelength value is smaller than the current wavelength value, it is determined that the adjustment mode is cooling adjustment;

The adjusted temperature value is determined according to the predetermined correspondence between the temperature change and the wavelength value.

It should be noted that, according to the pre-test, it can be known that there is a proportional change between the temperature change of the temperature control unit in the optical module and the wavelength of the laser beam output by the laser. For example, when the temperature of the temperature control unit is adjusted, the laser output The wavelength of the beam increases; when the temperature of the temperature control unit is lowered, the wavelength of the laser beam output by the laser decreases.

Based on the above rules, by comparing the determined target wavelength value with the current wavelength value, firstly, the temperature adjustment mode of the temperature control unit can be determined, and whether heating adjustment or cooling adjustment is required.

Further, the adjusted temperature value can be determined according to the corresponding relationship between the temperature change of the temperature control unit and the wavelength value change between the laser beam output by the laser obtained by the pre-test.

For example, the corresponding relationship between the temperature change of the temperature control unit and the change of the wavelength value of the laser beam output by the laser can be obtained by testing as follows: when the temperature of the temperature control unit is increased by 1 degree, the wavelength of the laser beam output by the laser increases 0.1nm, when the temperature of the temperature control unit is lowered by 1 degree, the wavelength of the laser beam output by the laser decreases by 0.1nm. According to the corresponding relationship obtained in advance, it can be determined that when the target wavelength value is greater than the current wavelength value, and the difference between the two is 2 nm, the temperature control unit can be controlled to increase the temperature, and when the temperature is increased by 20 degrees, the temperature can be increased by 20 degrees. The wavelength of the laser beam output by the laser increases by 2nm; in the same way, when the target wavelength value is less than the current wavelength value, and the difference between the two is 2nm, the temperature can be controlled by the temperature control unit to cool down, and the temperature can be lowered by 20 degrees. In this case, the wavelength of the laser beam output by the laser is reduced by 2 nm.

Therefore, according to the above-mentioned corresponding relationship, the adjustment method for temperature adjustment of the temperature control unit and the temperature value to be adjusted can be determined, so that the wavelength of the beam output by the laser can be adjusted from the current wavelength value to the target wavelength value.

Optionally, the wavelength adjustment method according to the embodiment of the present invention is adopted, wherein the method further includes:

After the wavelength of the beam output by the laser is adjusted to the target wavelength value, obtain the current temperature value and the current configuration value of the temperature control unit;

The current configuration value is stored, and the current temperature value is stored as the configuration temperature of the temperature control unit.

Through the above process, when the center wavelength of the beam output by the laser of the optical module is the target wavelength value, the current temperature value and the current configuration value of the temperature control unit can be obtained and stored.

Further, the wavelength adjustment method further includes:

When the optical module is restarted, read the stored current configuration value;

The current configuration value is output to the temperature control unit, so that the temperature control unit is at the configuration temperature.

Based on the current temperature value and the current configuration value of the temperature control unit stored above, when the optical module is restarted, the current configuration value is output to the temperature control unit, so that the temperature of the temperature control unit can be the configured temperature, and the optical module is completed. The configuration of the transmission wavelength ensures that the center wavelength of the laser beam output by the laser is the target wavelength value, so that the optical module enters the working state.

According to the above, using the wavelength adjustment method according to the embodiment of the present invention, when applied to an optical module, when the optical module is activated for the first time, the wavelength of the beam output by the laser of the optical module can be adjusted to one of the wavelengths of the light beam output by the laser of the optical module by adjusting the temperature of the temperature control unit. Preset the wavelength value to form a new transmission wavelength band; in addition, when the optical module starts up again, by outputting the configuration value when the wavelength is adjusted to the target wavelength value after the first startup to the temperature control unit, the center of the laser beam output by the laser is guaranteed. The wavelength remains at the target wavelength value.

Therefore, through the above method, on the basis of reusing the electronic components of the existing optical module, the optical module can be adjusted to the preset wavelength through temperature control after startup, so as to obtain a more optimized transmission wavelength range and complete the more efficient transmission. The definition of multiple wavelengths can optimize the transmission index and achieve the effect of larger bandwidth and more cost-effective transmission.

An embodiment of the present invention further provides a wavelength adjustment device, which is applied to an optical module. As shown in FIG. 3 , the device includes:

a wavelength acquisition module 310, configured to acquire the current wavelength value of the laser output beam of the optical module;

A selection module 320, configured to compare the current wavelength value with at least two preset wavelength values, and select the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value;

The temperature adjustment module 330 is configured to adjust the wavelength of the light beam output by the laser to the target wavelength value by adjusting the temperature of the temperature control unit of the optical module.

The wavelength adjustment device according to the embodiment of the present invention can adjust the wavelength of the beam output by the laser of the optical module to one of the preset wavelength values by adjusting the temperature of the temperature control unit, so as to form a new transmission wavelength band and form a more optimized wavelength. It can define more wavelength ranges, optimize transmission instructions, and achieve the effect of larger bandwidth and more cost-effective transmission.

Optionally, in the wavelength adjustment device, the temperature adjustment module 330 is also used for:

When adjusting the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value when the temperature control unit is temperature adjusted are determined.

Optionally, in the wavelength adjustment device, the temperature adjustment module 330 determines that when the wavelength of the beam output by the laser is adjusted to the target wavelength value, the temperature control unit is adjusted when the temperature is adjusted. mode and adjusted temperature values, including:

When the target wavelength value is greater than the current wavelength value, determine that the adjustment mode is temperature rise adjustment;

When the target wavelength value is smaller than the current wavelength value, it is determined that the adjustment mode is cooling adjustment;

The adjusted temperature value is determined according to the predetermined correspondence between the temperature change and the wavelength value change.

Optionally, the wavelength adjustment device, wherein the device further comprises:

A configuration acquisition module 340, configured to acquire the current temperature value and the current configuration value of the temperature control unit after the wavelength of the beam output by the laser is adjusted to the target wavelength value;

The storage module 350 is configured to store the current configuration value, and store the current temperature value as the configuration temperature of the temperature control unit.

Optionally, the wavelength adjustment device, wherein the device further comprises:

a reading module 360, configured to read the stored current configuration value when the optical module is restarted;

The control module 370 is configured to output the current configuration value to the temperature control unit, so that the temperature control unit is at the configuration temperature.

An embodiment of the present invention further provides an optical module. As shown in FIG. 4 , the optical module includes a processor 401; The program and data used by the processor 401 when performing operations, the processor 401 calls and executes the program and data stored in the memory 403 .

Wherein, the transceiver 404 is connected with the bus interface 402, and is used for receiving and sending data under the control of the processor 401. Specifically, the processor 401 is used to read the program in the memory 403, and execute the following process:

obtaining the current wavelength value of the laser output beam of the optical module;

comparing the current wavelength value with at least two preset wavelength values, and selecting the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value;

By adjusting the temperature of the temperature control unit of the optical module, the wavelength of the light beam output by the laser is adjusted to the target wavelength value.

Optionally, in the optical module, the processor 401 is further configured to:

When adjusting the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value when the temperature control unit is temperature adjusted are determined.

Optionally, in the optical module, when the processor 401 determines to adjust the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method when adjusting the temperature of the temperature control unit and adjusted temperature values, including:

When the target wavelength value is greater than the current wavelength value, determine that the adjustment mode is temperature rise adjustment;

When the target wavelength value is smaller than the current wavelength value, it is determined that the adjustment mode is cooling adjustment;

The adjusted temperature value is determined according to the predetermined correspondence between the temperature change and the wavelength value change.

Optionally, in the optical module, the processor 401 is further configured to:

After the wavelength of the beam output by the laser is adjusted to the target wavelength value, obtain the current temperature value and the current configuration value of the temperature control unit;

The current configuration value is stored, and the current temperature value is stored as the configuration temperature of the temperature control unit.

Optionally, in the optical module, the processor 401 is further configured to:

When the optical module is restarted, read the stored current configuration value;

The current configuration value is output to the temperature control unit, so that the temperature control unit is at the configuration temperature.

It should be noted that the optical module is a sparse wavelength division multiplexing CWDM optical module, or a local area network-wavelength division multiplexing LAN-WDM optical module.

Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program, and the program includes instructions for executing part or all of the steps of the above-mentioned method; and The program may be stored in a readable storage medium, which may be any form of storage medium.

In addition, a specific embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored, wherein when the program is executed by a processor, the steps in any one of the above wavelength adjustment methods are implemented.

In the several embodiments provided in this application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included individually, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or can be implemented in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute part of the steps of the transceiving method described in the various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, Read-Only Memory (ROM for short), Random Access Memory (RAM for short), magnetic disk or CD, etc. that can store program codes medium.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as It is the protection scope of the present invention.

Claims (7)

1. A wavelength adjustment method, applied to an optical module, is characterized in that, the method comprises: obtaining the current wavelength value of the laser output beam of the optical module; comparing the current wavelength value with at least two preset wavelength values, and selecting the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value; By adjusting the temperature of the temperature control unit of the optical module, the wavelength of the light beam output by the laser is adjusted to the target wavelength value; After the wavelength of the beam output by the laser is adjusted to the target wavelength value, obtain the current temperature value and the current configuration value of the temperature control unit; storing the current configuration value, and storing the current temperature value as the configuration temperature of the temperature control unit; When the optical module is restarted, read the stored current configuration value; The current configuration value is output to the temperature control unit, so that the temperature control unit is at the configuration temperature. 2. The wavelength adjustment method according to claim 1, wherein the method further comprises: When adjusting the wavelength of the light beam output by the laser to the target wavelength value, the adjustment method and the adjusted temperature value when the temperature control unit is temperature adjusted are determined. 3 . The wavelength adjustment method according to claim 2 , wherein when the wavelength of the beam output by the laser is determined to be adjusted to the target wavelength value, the temperature control unit is adjusted when the temperature is adjusted. 4 . mode and adjusted temperature values, including: When the target wavelength value is greater than the current wavelength value, determine that the adjustment mode is temperature rise adjustment; When the target wavelength value is smaller than the current wavelength value, it is determined that the adjustment mode is cooling adjustment; The adjusted temperature value is determined according to the predetermined correspondence between the temperature change and the wavelength value change. 4. A wavelength adjustment device, applied to an optical module, wherein the device comprises: a wavelength acquisition module for acquiring the current wavelength value of the laser output beam of the optical module; a selection module, configured to compare the current wavelength value with at least two preset wavelength values, and select the preset wavelength value with the smallest absolute value of the difference from the current wavelength value as the target wavelength value; a temperature adjustment module, configured to adjust the wavelength of the light beam output by the laser to the target wavelength value by adjusting the temperature of the temperature control unit of the optical module; an acquisition module is configured to acquire the current temperature value and the current configuration value of the temperature control unit after the wavelength of the beam output by the laser is adjusted to the target wavelength value; a storage module, configured to store the current configuration value, and store the current temperature value as the configuration temperature of the temperature control unit; a reading module for reading the stored current configuration value when the optical module is restarted; A control module, configured to output the current configuration value to the temperature control unit, so that the temperature control unit is at the configuration temperature. 5. An optical module, characterized in that it comprises: a processor, a memory and a program stored on the memory and executable on the processor, the program being executed by the processor to achieve the method as claimed in the claims The wavelength adjustment method of any one of 1 to 3. 6 . The optical module according to claim 5 , wherein the optical module is a sparse wavelength division multiplexing CWDM optical module, or a local area network-wavelength division multiplexing LAN-WDM optical module. 7 . 7. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the wavelength according to any one of claims 1 to 3 is realized Adjust the steps in the method.

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