CN111385019A

CN111385019A - Optical line testing system, method and storage medium

Info

Publication number: CN111385019A
Application number: CN201811628148.4A
Authority: CN
Inventors: 窦亮; 陈赛; 谢崇进
Original assignee: Alibaba Group Holding Ltd
Current assignee: Alibaba Group Holding Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-07-07
Anticipated expiration: 2038-12-28
Also published as: CN111385019B

Abstract

The embodiment of the application provides an optical line testing system, an optical line testing method and a storage medium. In the embodiment of the application, the multichannel light source is accessed to the optical transmission line to be tested, the multichannel light source is utilized to generate the multi-wavelength optical signal meeting the testing requirement and output the multi-wavelength optical signal to the optical transmission line, and then the transmission performance of the optical transmission line is tested.

Description

Optical line testing system, method and storage medium

Technical Field

The present application relates to the field of optical communication technologies, and in particular, to an optical line testing system, method, and storage medium.

Background

An optical communication system generally includes an optical terminal device that transmits and receives an optical signal, an optical transmission line, upper management control software, and the like. In order to ensure the performance of the optical communication system, the optical transmission line needs to be tested after the optical transmission line is designed and before the optical transmission line is deployed.

Testing of optical transmission lines requires sufficient optical termination equipment to allow for comprehensive testing. However, with the decoupling of optical communication systems open, devices of different vendors may coexist in the same optical communication system, for example, optical terminal devices and optical transmission lines are provided by different vendors. In this case, the optical transmission line provider faces the problem of how to open-circuit test the optical transmission line it designs.

Disclosure of Invention

Aspects of the present disclosure provide an optical line testing system, method, and storage medium, which are used to implement an open test on an optical transmission line without or without enough optical terminal devices, and provide conditions for decoupling an optical communication system.

An embodiment of the present application provides an optical line testing system, including: the system comprises an optical transmission line to be tested and a multi-channel light source connected into the optical transmission line; the multichannel light source is used for generating a multi-wavelength optical signal meeting the test requirement and outputting the multi-wavelength optical signal to the optical transmission line so as to test the transmission performance of the optical transmission line.

An embodiment of the present application further provides an optical line testing method, including: connecting a multi-channel light source into an optical transmission line to be tested; controlling the multi-channel light source to generate multi-wavelength optical signals meeting the test requirements and outputting the multi-wavelength optical signals to the optical transmission line; and testing the transmission performance of the optical transmission line by using the multi-wavelength optical signal.

Embodiments of the present application further provide a computer-readable storage medium storing a computer program, where the computer program is executed by one or more processors, and is capable of implementing the steps in the optical line testing method.

In the embodiment of the application, the multichannel light source is accessed to the optical transmission line to be tested, the multichannel light source is utilized to generate the multi-wavelength optical signal meeting the testing requirement and output the multi-wavelength optical signal to the optical transmission line, and then the transmission performance of the optical transmission line is tested.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1a is a schematic connection diagram of an optical transmission line according to an exemplary embodiment of the present application;

FIG. 1b is a schematic diagram of a connection for connecting a multi-channel light source to the optical transmission line shown in FIG. 1a according to an exemplary embodiment of the present application;

FIG. 1c is another schematic diagram of a connection for connecting a multi-channel optical source to the optical transmission line shown in FIG. 1a according to an exemplary embodiment of the present application;

fig. 2a is a schematic connection diagram of another optical transmission line provided in an exemplary embodiment of the present application;

FIG. 2b is a schematic diagram of a connection for connecting a multi-channel optical source to the optical transmission line shown in FIG. 2a according to an exemplary embodiment of the present application;

FIG. 2c is another schematic diagram of a connection for connecting a multi-channel optical source to the optical transmission line shown in FIG. 2a according to an exemplary embodiment of the present application;

fig. 3 is a schematic structural diagram of an optical Mesh network according to an exemplary embodiment of the present application;

fig. 4a is a schematic flowchart of an optical line testing method according to an exemplary embodiment of the present application;

fig. 4b is a schematic flowchart of another optical line testing method according to an exemplary embodiment of the present application;

fig. 4c is a partial schematic diagram of an optical terminal device connected to the optical transmission line shown in fig. 1a according to an exemplary embodiment of the present application;

fig. 4d is a partial schematic diagram of an optical terminal device connected to the optical transmission line shown in fig. 2a according to an exemplary embodiment of the present application;

FIG. 4e is a partial schematic view of yet another embodiment of the present application for interfacing a multi-channel light source to the optical transmission line of FIG. 1 a;

fig. 4f is a partial schematic diagram of another embodiment of the present application for connecting a multi-channel optical source to an optical transmission line shown in fig. 2 a.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

With the decoupling of optical communication systems, optical transmission line providers face the problem of how to open-circuit test the optical transmission lines they design. In some embodiments of the present application, a multi-channel light source is connected to an optical transmission line to be tested, and a multi-wavelength optical signal meeting a test requirement is generated by using the multi-channel light source and output to the optical transmission line, so as to test the transmission performance of the optical transmission line.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

In the embodiment of the application, a multichannel light source is applied to optical transmission line testing, and the multichannel light source is used for generating a multi-wavelength optical signal and simulating optical signals from a plurality of optical terminal devices in an actual use process. A multi-channel light source refers to a light source having multiple optical channels and capable of generating a multi-wavelength optical signal. Wherein one optical channel in the multi-channel optical source generates an optical signal of one wavelength, i.e. a single-wavelength optical signal. The single wavelength optical signals generated by the multiple optical channels are combined together to form a multi-wavelength optical signal. The single-wavelength optical signal refers to an optical signal containing a single wavelength, and the multi-wavelength optical signal refers to an optical signal containing multiple wavelengths.

It should be noted that the embodiment of the present application does not limit the implementation manner of the multi-channel light source, and all the forms of the light source capable of generating the multi-wavelength optical signal are suitable for the embodiment of the present application. In the embodiment of the present application, a multi-channel light source that already exists in the prior art may be adopted, or a multi-channel light source may be built by itself in the manner of the following optional embodiment of the present application.

In an alternative embodiment, a wide-spectrum light source and a Wavelength Selective Switch (WSS) may be used to build the multichannel light source. The wide-spectrum light source outputs wide-spectrum light, and the wide-spectrum light generates multi-wavelength optical signals after passing through the WSS. A broad spectrum light source is a light source that produces a light source spectrum with a broad linewidth, for example, the linewidth of the light source spectrum is typically greater than 30 nm. The line width refers to a spectral interval formed by the peak of the spectrum falling by a specified number of dB (e.g., 3dB or 10, 20 dB). Wherein, the designated dB number can be adaptively set according to the test requirement. All light sources that can generate broad spectrum light are suitable for the embodiments of the present application, and several implementation forms of broad spectrum light sources are listed below:

for example, an Optical Amplifier (OA) may be selected as the broad spectrum light source in the embodiment of the present application. The OA and WSS are connected to form a multi-channel light source, for example, the OA may be connected to an upper intersection (e.g., 1#) of the WSS. Wherein, OA generates spontaneous radiation noise (ASE) and generates multi-wavelength optical signal after WSS. Further alternatively, an optical power Amplifier (BA) in the optical Amplifier may be selected as the broad spectrum light source in the embodiment of the present application. The BA is connected to some upper intersection (e.g., 1#) of the WSS to form a multi-channel light source. Wherein, BA generates spontaneous radiation noise and generates multi-wavelength optical signals after WSS.

In an alternative embodiment, multiple single wavelength light sources may be used to build a multi-channel light source. The single-wavelength light source can only generate an optical signal with one wavelength, and the wavelengths of the optical signals generated by different single-wavelength light sources are different. Each single wavelength light source may act as one light channel in a multi-channel light source. Alternatively, the single-wavelength light source may employ a single-wavelength LED light source or a single-wavelength laser light source. Single wavelength LED light sources are LED light sources that can only produce light signals of one wavelength. A single wavelength laser light source is a laser light source (e.g., a laser) that can only produce one wavelength of light signal.

After obtaining the multi-channel light source, the multi-channel light source can be accessed into the optical transmission line to be tested; then, a multi-channel light source is used for generating a multi-wavelength optical signal meeting the testing requirement and outputting the multi-wavelength optical signal to the optical transmission line, and the transmission performance of the optical transmission line is tested.

It should be noted that the optical transmission line generally has a plurality of node devices, and these node devices and the optical fiber channels between the node devices form the optical transmission line. These node devices belong to line devices, unlike optical terminal devices. By way of example, node devices on an optical transmission line may include, but are not limited to: multiplexer (MUX), BA, optical Pre-Amplifier (PA), demultiplexer (DeMUX).

The multi-channel light source can be connected to the optical transmission line at different positions according to different test requirements. For convenience of description, the position of the multi-channel light source accessing the optical transmission line is referred to as a designated position, which may be determined by test requirements.

For example, if the transmission performance of the entire optical transmission line needs to be tested, the specified position may be a position before the first node device on the optical transmission line, that is, the multi-channel light source is directly optically connected to the first node device on the optical transmission line, so as to access the optical transmission line. Of course, if it is not necessary to test the transmission performance of the entire optical transmission line or it is not appropriate to test the transmission performance of the entire optical transmission line, the designated location may be any location after the first node device on the optical transmission line. It should be noted that, if the designated location is any location behind the first node device on the optical transmission line, the optical connection between the front and rear node devices at the designated location may be broken, so as to eliminate the influence of the front node device on the test process, and improve the precision of the test effect.

The optical transmission line may differ in different optical communication systems. In addition, the optical transmission lines designed by different optical line providers may also differ. No matter what kind of optical transmission line can be connected to the multichannel light source at the proper position on the line, and the multichannel light source is used for generating the multi-wavelength optical signal to carry out performance test. The node devices included in different optical transmission lines are generally different, and accordingly, the positions at which the multi-channel optical sources are connected to the optical transmission lines are different. The technical solution of the present application will be described in detail below with reference to several connection diagrams of optical transmission lines.

Fig. 1a is a schematic connection diagram of an optical transmission line according to an exemplary embodiment of the present application. As shown in fig. 1a, the optical transmission line includes a station 1 and a station 2, and a unidirectional optical transmission line is provided between the station 1 and the station 2; site 1 includes a MUX, an Optical Channel Monitor (OCM) electrically connected to the MUX, and a BA electrically connected to the MUX; site 2 includes an optical Preamplifier (PA), a demultiplexer (DeMUX) electrically connected to the PA, and an OCM electrically connected to the DeMUX. Wherein, the node devices are connected through optical fibers or optical cables.

It should be noted that the optical transmission line shown in fig. 1a may also include other node devices, and is not limited to the node devices shown in fig. 1 a.

In fig. 1a, optical signals from a plurality of optical terminal devices in a station 1 may be transmitted through a 1: the MUXs of N are grouped together. N is a natural number greater than 1. It should be noted that there are many ways such convergence can be achieved, and the convergence is not limited to 1: n MUX, can also use 1: the N couplers are directly converged, or the upper MUX and the lower MUX are respectively converged and then are converged together. The converged optical signals are divided into two paths, one path is sent to an OCM electrically connected with the MUX, the OCM can measure the optical power of each optical channel (namely, the optical signals with each wavelength), and the other path is directly accessed to an optical fiber after being amplified by BA. After the optical signal is transmitted through the optical fiber, the optical signal is attenuated, the attenuated optical signal enters the PA, and the PA compensates the optical signal. The optical signal compensated by PA is divided into two paths, one path directly enters the DeMUX of the site 2, and after being demultiplexed by the DeMUX, reaches the optical terminal equipment of the receiving end, and the other path enters the OCM of the site 2, and the OCM can measure the optical power of each optical channel (i.e., the optical signal of each wavelength).

For the optical transmission line shown in fig. 1a, if the MUX is not sensitive, then the multi-channel light source can be connected to the optical transmission line before the MUX, i.e. the multi-channel light source is connected to one input of the MUX, as shown in fig. 1 b. In FIG. 1b, the multichannel light source includes BA and WSS, and OCM is connected to the monitoring port of WSS.

For the optical transmission line shown in fig. 1a, if the MUX is sensitive, then the multi-channel light source can be switched in the optical transmission line after the MUX, as shown in fig. 1c, i.e. the multi-channel light source is optically connected to the BA, and the optical connection between the BA and the MUX is disconnected. In FIG. 1c, the multichannel light source includes BA and WSS, and OCM is connected to the monitoring port of WSS.

It should be noted that, under the condition that the MUX is not sensitive, if the transmission performance of a part of the optical transmission line needs to be tested, the optical transmission line can be disconnected at a corresponding position, and the multi-channel light source is connected to the disconnected position, so as to test the performance of a subsequent part of the optical transmission line.

Fig. 2a is a schematic connection diagram of another optical transmission line provided in an exemplary embodiment of the present application. As shown in fig. 2a, the optical transmission line includes a station 3 and a station 4, a bidirectional optical transmission line is provided between the station 3 and the station 4, and the optical transmission line in each transmission direction has a protection link, that is, two active and standby optical transmission lines are provided in each transmission direction between the station 3 and the station 4. As shown in fig. 2a, the station 3 comprises: the system comprises a MUX, an optical splitter and an OCM which are electrically connected with the MUX, and two ways of BA connected with the optical splitter; and the DeMUX, optical switches (SWitch, SW) and the OCM are electrically connected with the DeMUX, and the two paths of PAs are connected with the SW. Similarly, the station 4 also includes: the system comprises a MUX, an optical splitter and an OCM which are electrically connected with the MUX, and two ways of BA connected with the optical splitter; and the DeMUX, optical switches (SWitch, SW) and the OCM are electrically connected with the DeMUX, and the two paths of PAs are connected with the SW. Wherein, the two BA paths in the station 3 are respectively connected with the two SW paths in the station 4 by optical fibers; the two SW paths in station 3 are connected to the two BA paths in station 4 by optical fibers. In FIG. 2a, a 50:50 splitter is used, but is not limited thereto.

It should be noted that the optical transmission line shown in fig. 2a may also include other node devices, and is not limited to the several node devices shown in fig. 2 a.

In fig. 2a, optical signals from a plurality of optical terminal devices in station 3 can be transmitted through 1: the MUXs of N are grouped together. N is a natural number greater than 1. It should be noted that there are many ways such convergence can be achieved, and the convergence is not limited to 1: the N MUXs can also be directly converged by a 1: N coupler, or can be converged by an upper MUX and a lower MUX respectively and then converged together. The converged optical signals are divided into two paths, one path is sent to an OCM electrically connected with the MUX, the OCM can measure the optical power of each optical channel (namely, the optical signals with each wavelength), the other path is sent to two BAs through a 50:50 optical splitter, and the two BAs are amplified and then respectively enter main and standby transmission optical fibers (fibers).

The two optical signals are attenuated after being transmitted by the optical fiber, the attenuated two optical signals respectively enter two paths of PAs in the site 4, and each path of PA compensates the received optical signals. The optical signals compensated by the PA all reach SW in the site 4, the power values of the two optical signals are selectively received by the SW, the received optical signals are divided into two paths, one path directly enters the DeMUX of the site 4, is demultiplexed by the DeMUX and reaches the optical terminal equipment of the receiving end, the other path enters the OCM of the site 4, and the OCM can measure the optical power of each optical channel (i.e., optical signals of each wavelength).

It should be noted that the transmission process of the optical signal transmitted from the station 4 to the station 3 on the optical transmission line is similar to the transmission process of the optical signal transmitted from the station 3 to the station 4, and is not described again.

Alternatively, as shown in fig. 2a, the Optical signal transmission process can be controlled and managed by the stations 3 and 4 using an Optical Supervisory Channel (OSC). Of course, the sites 3 and 4 may not employ OSC. It should be noted that, in the case that the sites 3 and 4 employ OSC, the sites 3 and 4 may further include OSC node devices, which are not shown in fig. 2 a.

For the optical transmission line shown in fig. 2a, if the MUX is not sensitive, then the multi-channel light source can be connected to the optical transmission line before the MUX, i.e. the multi-channel light source is connected to one input of the MUX, as shown in fig. 2 b. In fig. 2b, the multi-channel light source comprises BA and WSS, and OCM is connected to the monitoring port of WSS.

For the optical transmission line shown in fig. 2a, if the MUX is sensitive, the multi-channel optical source may be connected to the optical transmission line after the MUX, as shown in fig. 2c, that is, the multi-channel optical source is connected to the optical splitter optically, and the optical connection between the optical splitter and the MUX is disconnected. In fig. 2c, the multi-channel light source comprises BA and WSS, and OCM is connected to the monitoring port of WSS.

Of course, under the condition that the MUX is insensitive, if the transmission performance of a part of the optical transmission line needs to be tested, the optical transmission line can be disconnected at a corresponding position, and the multi-channel light source is connected to the disconnected position, so as to test the performance of a subsequent part of the optical transmission line.

It should be noted that fig. 2a includes a bidirectional optical transmission line between the station 3 and the station 4, where an optical transmission line in one direction is an optical transmission line for transmitting an optical signal from the station 3 to the station 4, and an optical transmission line in the other direction is an optical transmission line for transmitting an optical signal from the station 4 to the station 3. The optical transmission lines in both directions need to be tested in a similar manner, so that only schematic diagrams of accessing the multi-channel light source on the optical transmission line in one of the directions are shown in fig. 2b and 2 c.

The optical line testing scheme provided by the embodiment of the application can be applied to an optical communication system from a station to a station and can also be applied to a more complex Mesh network. A simplified schematic diagram of a Mesh network is shown in figure 3. In the Mesh network shown in fig. 3, stations A, B, C and D are included, station a being optically connected to station B, station B being optically connected to station D, station a being optically connected to station C, and station C being optically connected to station D. Of course, station B and station C may also be optically connected. Stations A, B, C and D may have the station structure shown in fig. 1a, or may have the station structure shown in fig. 2 a. In fig. 3, the multi-channel light source is accessed to the optical transmission line at BA as an example, but not limited thereto.

It is worth noting that by using the optical line testing scheme provided in the embodiment of the present application, the transmission performance of the optical transmission line from the station a to the station B, from the station B to the station D, from the station a to the station C, or from the station C to the station D can be tested, and the transmission performance of the optical transmission line from the station a to the station D through the station B, from the station B to the station C through the station D, or from the station D to the station a through the station C can also be tested. For site a to pass through site B to site D, site B is a pass-through node; for site B to pass through site D to site C, site D is a pass-through node; site C is a pass-through node for site D to pass through site C to site a.

When an optical transmission line from a station a to a station B, an optical transmission line from a station a to a station C, or an optical transmission line from a station a to a station D via a station B is tested, a multi-channel optical source may be accessed in the station a. If the station a adopts the station structure shown in fig. 1a, the multi-channel light source can be accessed at the station a in the manner shown in fig. 1b or fig. 1 c. If the station a adopts the station structure shown in fig. 2a, the multi-channel light source can be accessed at the station a in the manner shown in fig. 2b and 2 c.

When testing an optical transmission line from site B to site D or an optical transmission line from site B to site C via site D, a multi-channel optical source can be accessed in site B. If the station B adopts the station structure shown in fig. 1a, the multi-channel light source can be accessed at the station B in the manner shown in fig. 1B or fig. 1 c. If the station B adopts the station structure shown in fig. 2a, the multi-channel light source can be accessed at the station B in the manner shown in fig. 2B and fig. 2 c.

When testing the optical transmission line from site C to site D, a multi-channel optical source may be accessed in site C. If the station C adopts the station structure shown in fig. 1a, the multi-channel light source can be accessed at the station C in the manner shown in fig. 1b or fig. 1C. If the station C adopts the station structure shown in fig. 2a, the multi-channel light source can be accessed at the station C in the manner shown in fig. 2b and fig. 2C.

When testing an optical transmission line from site D to site a via site C, a multi-channel optical source may be accessed in site D. If the station D adopts the station structure shown in fig. 1a, the multi-channel light source can be accessed at the station D in the manner shown in fig. 1b or fig. 1 c. If the station D adopts the station structure shown in fig. 2a, the multi-channel light source can be accessed at the station D in the manner shown in fig. 2b and fig. 2 c.

No matter what structure of the optical transmission line, the process of testing the optical transmission line by using the multi-channel light source, as shown in fig. 4a, includes the following steps:

401. and connecting the multichannel light source into the optical transmission line to be tested.

402. And controlling the multi-channel light source to generate multi-wavelength optical signals meeting the test requirements and outputting the multi-wavelength optical signals to the optical transmission line.

403. The transmission performance of the optical transmission line is tested using multi-wavelength optical signals.

In the embodiment of the application, a multichannel light source is connected to an optical transmission line, so that an optical line test system is obtained. The multi-channel light source can be accessed at a specified position on the optical transmission line, wherein the specified position is determined by test requirements and can be any position on the optical transmission line. The multi-wavelength optical signal is relative to a single-wavelength optical signal, where a single-wavelength optical signal refers to an optical signal containing a single wavelength, and a multi-wavelength optical signal refers to an optical signal containing multiple wavelengths.

Alternatively, the optical transmission line shown in fig. 1a and fig. 2a, including the MUX, may be accessed before the MUX, i.e. the designated location is the location before the MUX; alternatively, the multi-channel light source may be accessed after the MUX, i.e., the designated location is a location after the MUX.

Further, as shown in fig. 1a or fig. 2a, an optical power amplifier or an optical splitter is connected after the MUX, so that the connection between the MUX and the optical power amplifier or the optical splitter can be disconnected, and the multi-channel optical source can be connected to the optical power amplifier or the optical splitter to access the optical transmission line.

On the basis of an optical line test system, a multi-channel light source is controlled to generate multi-wavelength optical signals meeting test requirements and output the multi-wavelength optical signals to an optical transmission line, and then the multi-wavelength optical signals can be used for testing the transmission performance of the optical transmission line.

For example, in some application scenarios, it is assumed that the full-scale configuration of the optical transmission line is 96 channels, that is, at most 96 wavelengths of optical signals are supported, and 96 channels are used in the on-line use. In this application scenario, the multi-channel light source may be controlled to generate optical signals containing 96 wavelengths and output the optical signals onto the optical transmission line, and the transmission performance of the optical transmission line may be tested by using the transmission condition of the optical signals containing 96 wavelengths on the optical transmission line.

For another example, in other application scenarios, it is assumed that the full allocation of the optical transmission line is 96 channels, that is, at most 96 wavelengths of optical signals are supported, but 8 channels are used in the initial period, and the optical transmission line extends to 20 channels after 1 year, and extends to 40 channels after 2 years, and so on. In this application scenario, the multi-channel light source can be controlled to generate optical signals containing 8 wavelengths, optical signals containing 20 wavelengths, or optical signals containing 40 wavelengths, respectively, according to the usage expansion of the optical transmission line, so as to test the transmission performance of the optical transmission line in each usage state. In addition, the optical transmission line may be controlled to generate optical signals including 96 wavelengths, and the transmission performance of the optical transmission line in the full-scale state may be directly tested. Generally, if the transmission performance of the optical transmission line in the fully matched state meets the standard, the transmission performance of the optical transmission line in any non-fully matched state also meets the standard.

As can be seen from the above, in the embodiment of the present application, the multi-channel light source can generate the multi-wavelength optical signal meeting the test requirement, and the multi-wavelength optical signal meeting the test requirement is used for testing, so that the worst channel performance can be ensured to be detected, the transmission performance of the optical transmission line under the condition of full-scale or nearly full-scale distribution can also be reflected, and the improvement of the test precision and accuracy is facilitated.

In some optional embodiments of the present application, considering that the transmission performance of the optical transmission line is mainly represented by a power attenuation condition (simply referred to as power of each optical channel) and/or an optical signal to Noise Ratio (OSNR) of the optical signal of each wavelength on the optical transmission line, a process of testing the transmission performance of the optical transmission line using the multi-wavelength optical signal may be represented by a process of testing the power and/or OSNR of each optical channel on the optical transmission line.

When testing the transmission performance of the optical transmission line, whether to test the power attenuation of each optical channel on the optical transmission line or to test the OSNR of each optical channel can be flexibly selected according to the requirements of the optical communication system. For some optical communication systems, the power attenuation of each optical channel on the optical transmission line is relatively concerned, and the power of each optical channel on the optical transmission line can be tested individually. For some optical communication systems, the OSNR of each optical channel may be tested individually, comparing the OSNR of each optical channel of interest. For some optical communication systems, attention is paid to the power attenuation condition and the OSNR of each optical channel, and the power and the OSNR of each optical channel on an optical transmission line can be tested simultaneously.

Optionally, in the optical line test system shown in fig. 1b, fig. 1c, fig. 2b, or fig. 2c, after the multi-channel light source outputs the multi-wavelength optical signal meeting the test requirement, power values of the multi-wavelength optical signal at several node devices on the optical transmission line may be collected; and testing the transmission performance of the optical transmission line according to the power values of the multi-wavelength optical signals at the plurality of node devices and the power design margins corresponding to the plurality of node devices. The node devices are node devices after a specific location (e.g., combiner, splitter, or BA) on the optical transmission line. The number of the node devices and the specific node devices can be adaptively selected according to the test requirements.

Optionally, the plurality of node devices may be node devices behind a specified position on the optical transmission line, that is, power values of the multi-wavelength optical signal at the node devices behind the multi-channel optical source on the optical transmission line may be collected. Taking the optical line test system shown in fig. 1b as an example, after the multi-channel light source outputs the multi-wavelength optical signal, the power values of the optical signal at the MUX output, BA, PA and DeMUX may be collected. Taking the optical line test system shown in fig. 1c as an example, after the multi-channel light source outputs the multi-wavelength optical signal, the power values of the optical signal at the PA and the DeMUX may be collected.

Then, the power value of the multi-wavelength optical signal at each node device behind the multi-channel optical source can be compared with the power design margin corresponding to each node device; if the power design allowance is reached, determining that the transmission performance of the optical transmission line reaches the standard, namely, the transmission performance meets the design requirement; otherwise, the transmission performance of the optical transmission line is determined to be not up to the standard, that is, not up to the design requirement.

For each node device in the plurality of node devices, the power value of the multi-wavelength optical signal at the node device may be acquired by the OCM disposed at the node device. Alternatively, the power values of the multi-wavelength optical signals at several node devices may be manually collected by a power meter. It is explained here that the power values of the collected optical signals with various wavelengths at each node device actually include the sum of the power value of the optical signal itself and the power value of the noise signal on the optical channel where the optical signal is located.

In other optional embodiments of the present application, when testing the transmission performance of the optical transmission line, the multi-channel optical source may be further controlled to close a specified optical channel, where the specified optical channel is used to generate an optical signal with a specified wavelength in the multi-wavelength optical signal, where the optical signal with the specified wavelength is a single-wavelength optical signal, and the wavelength of the single-wavelength optical signal is a specified wavelength; then, the power value at the first node device before and after the specified optical channel is closed may be collected; further, the OSNR of the designated optical channel may be calculated according to the power value at the first node device before and after the designated optical channel is closed; the transmission performance of the optical transmission line can be further tested according to the OSNR of the specified optical channel. Wherein the power value at the first node device after the specified channel is closed is substantially the noise power on the specified channel.

If the OSNR of the appointed optical channel meets the OSNR design allowance corresponding to the first node equipment, determining that the transmission performance of the optical transmission line reaches the standard, namely meeting the design requirement; otherwise, the transmission performance of the optical transmission line is determined to be not up to the standard, namely the design requirement is not met.

The first node device may be any node device located after the multi-channel optical source on the optical transmission line, and preferably may be the last node device on the optical transmission line, such as a demultiplexer. In addition, specifying an optical channel according to test requirements may include one or more, i.e., one or more, optical channels may be tested for OSNR.

It should be noted that, the steps in the test method may be manually performed by a human, and of course, the steps in the test method may also be automatically performed by the management and control device.

Optionally, in the optical line test system shown in fig. 1b, fig. 1c, fig. 2b, or fig. 2c, a management and control device may be included, where the management and control device is mainly configured to collect power values of multiple wavelength optical signals at several node devices on an optical transmission line after the multiple wavelength optical signals are output by a multi-channel optical source; and testing the transmission performance of the optical transmission line according to the power values of the multi-wavelength optical signals at the plurality of node devices and the power design margins corresponding to the plurality of node devices. That is, the process of testing an optical transmission line using a multi-wavelength optical signal may be implemented by a management and control device.

The management and control device may control the plurality of node devices located behind the multichannel light source on the optical transmission line to report the measured power values to the node devices, and compare the power values reported by the node devices with power design margins corresponding to the plurality of node devices. In addition, the management and control device may further control a first node device located behind the multi-channel light source on the optical transmission line to report a power value measured before and after the specified optical channel is closed, calculate an OSNR of the specified optical channel according to the power value at the first node device before and after the specified optical channel is closed, and further compare the OSNR of the specified optical channel with an OSNR design margin corresponding to the first node device. And the management and control equipment obtains the transmission performance of the optical transmission line according to any one comparison result or two comparison results.

Optionally, if the management and control device is located in the same site as the multi-channel light source, the management and control device may directly send a closing instruction to the multi-channel light source, where the closing instruction carries a channel identifier of the specified light channel to instruct the multi-channel light source to close the specified light channel.

Optionally, if the management and control device and the multi-channel light source are located in different sites, the management and control device may send a closing instruction to the multi-channel light source through the OSC, where the closing instruction carries a channel identifier of the specified light channel to instruct the multi-channel light source to close the specified light channel.

In some alternative embodiments of the present application, an OSC node device may be included on an optical transmission line, such as the optical transmission line shown in fig. 2a, but is not limited to that shown in fig. 2 a. The OSC uses another light beam except the service light and is mainly responsible for receiving and transmitting control information in the optical communication process, but not the service information, so that the optical communication process is controlled and managed. In the embodiment of the present application, it is assumed that the optical transmission line further includes a first OSC node and a second OSC node device; wherein the first OSC node device is electrically connected to the multi-channel optical source, and both are located in the same site, such as site 3 in fig. 2b and 2 c; the second OSC node device is electrically connected to the policing device and both are located within another site, such as site 4 in fig. 2b and 2 c. For this situation, during the test process, the management and control device may perform control management on the multi-channel light source by using the OSC, so as to further improve the test efficiency.

For example, in a scenario of testing the OSNR of a specific optical channel, the management and control device may control the multi-channel light source to turn on or turn off the specific optical channel through the OSC between the second OSC node device and the first OSC node device, calculate the optical signal-to-noise ratio of the specific optical channel according to the power value at the first OSC node device before and after the specific optical channel is turned off, and test the transmission performance of the optical transmission channel using the optical signal-to-noise ratio of the specific optical channel.

The management and control device may send a closing instruction to the multi-channel light source through an OSC channel between the second OSC node device and the first OSC node device, where the closing instruction carries a channel identifier of a specific optical channel, so as to instruct the multi-channel light source to close the specific optical channel identified by the channel identifier.

Specifically, the management and control device sends the close command to the second OSC node device in the form of an electrical signal, the second OSC node device converts the close command from the electrical signal to an optical signal, and transmits the optical signal to the first OSC node device through the OCS, and the first OSC node device converts the close command from the optical signal to the electrical signal and transmits the electrical signal to the multichannel light source. The multi-channel light source receives a closing instruction sent by the first OSC node, analyzes a channel identifier from the closing instruction, and then closes the optical channel identified by the channel identifier to provide a basis for calculating the OSNR of the optical channel. Of course, the management and control device may also send a turn-on instruction to the multi-channel light source through the OSC to instruct the multi-channel light source to turn on the light channel that is turned off. The opening instruction may carry a channel identifier of the optical channel to be opened. In this alternative embodiment, the OSNR of a given optical channel can be automatically measured based on the OSC, which is advantageous for improving the measurement efficiency.

In some application scenarios, there may be one or more optical terminal devices adapted to the optical transmission line, and these optical terminal devices may generate optical signals that the optical transmission line needs to transmit. However, in consideration of the insufficient number of optical terminal devices, the transmission performance of the optical transmission line is still tested by using a multi-channel light source instead of the optical terminal devices. In order to improve the test accuracy, the existing optical terminal equipment may be used to perform power calibration on the multi-wavelength optical signal generated by the multi-channel optical source, considering that the power of the input optical signal has some influence on the transmission characteristics (such as gain and noise index) of the active node equipment (such as an optical amplifier) on the optical transmission line. In these application scenarios, as shown in fig. 4b, a process of an optical line testing mode includes the following steps:

and step 41, recording the transmission condition of the optical signal with the reference wavelength generated by the optical terminal equipment when the optical transmission line is in the original connection state.

Before the multi-channel light source is connected to the optical transmission line, an optical terminal device may be connected to the optical transmission line, mainly for outputting an optical signal of a reference wavelength onto the optical transmission line. For the convenience of differentiation and description, in the embodiments of the present application, a single-wavelength optical signal generated by an optical terminal device is used as an optical signal of a reference wavelength, and the optical signal of the reference wavelength may be an optical signal of any wavelength that needs to be transmitted on an optical transmission line.

After the optical terminal device outputs the optical signal of the reference wavelength onto the optical transmission line, the transmission condition of the optical signal of the reference wavelength on the optical transmission line can be recorded. Alternatively, the transmission condition of the optical signal of the reference wavelength on the optical transmission line may be embodied as a power value of the optical signal of the reference wavelength at the second node device on the optical transmission line. The second node device may be any node device on the optical transmission line.

With reference to the optical transmission line shown in fig. 1a and 2a, before the multi-channel optical source is connected to the optical transmission line, an optical termination device (Trasnponder) may be connected to one channel of the multiplexer. Fig. 4c and 4d are schematic partial diagrams of an optical transmission line after the optical terminal device is connected.

After the optical terminal equipment is connected to one path of the combiner, the optical terminal equipment outputs the optical signal with the reference wavelength, and then the optical terminal equipment can be connected to the second section of the combinerRecording optical power P at a point device₀. Of course, the optical power P may be recorded at the OCM_OCM. In fig. 4c, the second node device is a BA, but is not limited thereto. In fig. 4d, the second node device is an optical splitter, but is not limited thereto. Optical power P here₀The information can be directly read from the second node device or measured from the corresponding monitoring port through an optical power meter.

And 42, calibrating the power of the multi-wavelength optical signal generated by the multi-channel optical source by utilizing the transmission condition of the optical signal with the reference wavelength on the optical transmission line.

After step 41, a multi-channel light source may be interfaced into the optical transmission line. The manner of connecting the multi-channel light source to the optical transmission line can be seen from the description of the foregoing embodiments. In conjunction with the optical transmission lines shown in fig. 4c and 4d, a schematic diagram of a multi-channel light source accessing the optical transmission line is shown in fig. 4e and 4f, respectively. In fig. 4e, the multichannel light source comprises BA and WSS, the monitoring port of WSS is connected with OCM, the multichannel light source is connected with BA in optical connection, and BA is disconnected from MUX. In FIG. 4f, the multichannel light source includes BA and WSS, OCM is connected to the monitoring port of WSS, the multichannel light source is optically connected to the 50:50 optical splitter, and the 50:50 optical splitter is disconnected from MUX.

Next, power calibration is performed on each single-wavelength optical signal output by the multi-channel optical source according to the transmission condition of the optical signal of the reference wavelength on the optical transmission line.

Optionally, in a scenario where the transmission condition of the optical signal of the reference wavelength on the optical transmission line is embodied as a power value of the optical signal of the reference wavelength at the second node device on the optical transmission line, the process of performing power calibration on each single-wavelength optical signal output by the multi-channel optical source is as follows:

step S0: controlling the multichannel light source to output optical signals with the first wavelength which is the same as the reference wavelength, and blocking the optical signals with other wavelengths;

step S1: adjusting an attenuation value of the multi-channel optical source to the optical signal of the first wavelength such that a power value P of the optical signal of the first wavelength at the second node device₁With optical signals of reference wavelength in the second sectionPower value P at point device₀Equal;

step S2: and adjusting the attenuation values of the multi-channel light source to the optical signals of other wavelengths according to the attenuation value of the multi-channel light source to the optical signal of the first wavelength.

Further, one embodiment of step S2 includes: power value P of optical signal at first wavelength at second node device₁Power value P at the second node device of the optical signal with the reference wavelength₀When the light signals are equal, the power value P of the monitoring port of the multi-channel light source can be recorded when the light signals with the first wavelength are output_OCM-1(ii) a Then, the multichannel light source is controlled to sequentially output optical signals with other wavelengths, and the attenuation values of the multichannel light source to the optical signals with other wavelengths are adjusted, so that the power value P on the monitoring port of the multichannel light source is enabled to be the power value P when the multichannel light source outputs the optical signals with other wavelengths_OCM-xThe power value P of the multi-channel light source on the monitoring port when outputting the optical signal of the first wavelength_OCM-1Are equal. Alternatively, the multi-channel light source may output optical signals at the first wavelength and at other wavelengths at the same output port, e.g. at the same upper intersection of the WSS in the multi-channel light source.

Wherein, the power value P of the multichannel light source on the monitoring port thereof_OCM-1Sum power value P_OCM-xThe OCM can be measured by an OCM connected to a monitoring port of the multi-channel light source.

After the operation, the power of the multi-wavelength optical signal generated by the multi-channel optical source is calibrated to be the same as or approximately the same as the power of the optical signal actually required to be output by the optical terminal equipment.

And 43, testing the transmission performance of the optical transmission line by using the multi-wavelength optical signal after power calibration.

After power calibration is performed on the multi-wavelength optical signal generated by the multi-channel optical source, the transmission performance of the optical transmission line can be tested by using the multi-wavelength optical signal after power calibration.

Alternatively, the power value of the multi-wavelength optical signal may be recorded on the entire subsequent node device, and it may be checked whether the power value meets the power value requirement in the design margin. In addition, a certain optical channel can be independently closed by controlling the setting of the WSS in the multi-channel optical source, a noise power value on the corresponding optical channel is obtained at the receiving end of the optical transmission line through OSA measurement, and further the OSNR on each optical channel is obtained, and whether the OSNR meets the OSNR requirement in the design margin or not is checked. The detailed description of the process can be referred to the description of the foregoing method embodiments, and is not repeated herein.

And 44, restoring the optical transmission line from the test connection state to the original connection state under the condition that the transmission performance of the optical transmission line meets the design requirement.

If the test result shows that the transmission performance of the optical transmission line meets the design requirement, the optical transmission line can be restored to the original connection state from the test connection state, so that the optical transmission line can be used online. For example, the multi-channel light source may be removed from the optical transmission line and the combiner reconnected to the BA or splitter.

It should be noted that, considering that the multi-channel light source is removed and the combiner and the BA or the splitter are reconnected, the performance of the optical transmission line may be slightly affected, and therefore, some other ways may be adopted to ensure that the transmission performance restored to the original connection state is as consistent as possible with the transmission performance before the test.

Accordingly, the present application further provides a computer-readable storage medium storing a computer program, where the computer program can implement the steps in the above method embodiments when executed.

In some of the flows described in the above embodiments and the drawings, a plurality of operations are included in a specific order, but it should be clearly understood that the operations may be executed out of the order presented herein or in parallel, and the sequence numbers of the operations, such as 401, 402, etc., are merely used to distinguish various operations, and the sequence numbers themselves do not represent any execution order. Additionally, the flows may include more or fewer operations, and the operations may be performed sequentially or in parallel. It should be noted that, the descriptions of "first", "second", etc. in this document are used for distinguishing different messages, devices, modules, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An optical line testing system, comprising: the system comprises an optical transmission line to be tested and a multi-channel light source connected to the optical transmission line;

the multichannel light source is used for generating a multi-wavelength optical signal meeting the test requirement and outputting the multi-wavelength optical signal to the optical transmission line so as to test the transmission performance of the optical transmission line.

2. The system of claim 1, wherein the multi-channel light source comprises: a broad spectrum light source and a wavelength selective switch; the wide-spectrum light source outputs wide-spectrum light, and generates a multi-wavelength optical signal after passing through the wavelength selection switch.

3. The system of claim 1, wherein the broad spectrum light source generates spontaneous emission noise for the optical amplifier.

4. The system of claim 1, wherein the multi-channel light source is coupled into the optical transmission line at a specified location on the optical transmission line, the specified location determined by test requirements.

5. The system of claim 4, wherein the optical transmission line comprises a combiner, and the multi-channel light source is coupled into the optical transmission line after the combiner, or the multi-channel light source is coupled into the optical transmission line before the combiner.

6. The system of claim 5, wherein the optical transmission line further comprises: an optical power amplifier or an optical splitter after the combiner; the multichannel light source is connected to the optical transmission line between the combiner and the optical power amplifier or the optical splitter, and the combiner is disconnected with the optical power amplifier or the optical splitter.

7. The system of any one of claims 1-6, further comprising:

the optical terminal equipment is used for accessing the optical transmission line before the multichannel light source is accessed to the optical transmission line and outputting an optical signal with a reference wavelength to the optical transmission line;

and after the multi-channel light source is connected to the optical transmission line, the multi-channel light source is further used for performing power calibration on the generated multi-wavelength optical signal according to the transmission condition of the optical signal with the reference wavelength on the optical transmission line.

8. The system of any one of claims 1-6, further comprising:

the control device is used for collecting power values of the multi-wavelength optical signals at a plurality of node devices on the optical transmission line after the multi-channel optical source outputs the multi-wavelength optical signals; the transmission performance of the optical transmission line is tested based on the power values of the multi-wavelength optical signals at the plurality of node devices.

9. The system of claim 8, wherein the optical transmission line further comprises a first OSC node device and a second OSC node device; the first OSC node equipment is electrically connected with the multi-channel light source and is positioned in the same site; the second OSC node equipment is electrically connected with the control equipment and is positioned in another site;

the management and control device is further configured to control, through an OSC between the second OSC node device and the first OSC node device, the multichannel light source to turn on or turn off the designated optical channel, calculate an optical signal-to-noise ratio of the designated optical channel according to a power value at the first OSC node device before and after the designated optical channel is turned off, and test the transmission performance of the optical transmission channel using the optical signal-to-noise ratio of the designated optical channel; the first node device is any node device on the optical transmission line.

10. An optical line testing method, comprising:

connecting a multi-channel light source into an optical transmission line to be tested;

controlling the multi-channel light source to generate multi-wavelength optical signals meeting the test requirements and outputting the multi-wavelength optical signals to the optical transmission line;

and testing the transmission performance of the optical transmission line by using the multi-wavelength optical signal.

11. The method of claim 10, wherein accessing a multi-channel light source into an optical transmission line to be tested comprises:

accessing the multi-channel light source at a specified location on the optical transmission line, the specified location determined by a test requirement.

12. The method of claim 11, wherein the optical transmission line comprises a combiner, and accessing the multi-channel light source at a specified location on the optical transmission line comprises:

switching in the multi-channel light source before the combiner; or

The multichannel light source is switched in after the wave combiner.

13. The method of claim 12, wherein the optical transmission line further comprises: the optical power amplifier or the optical splitter after the combiner is connected to the multichannel optical source after the combiner, and the optical power amplifier or the optical splitter includes:

disconnecting the combiner from the optical power amplifier or the optical splitter;

and connecting the multichannel light source with the optical power amplifier or the optical splitter to access the optical transmission line.

14. The method according to any of claims 10-13, wherein testing the transmission performance of the optical transmission line using a multi-wavelength optical signal comprises:

collecting power values of multi-wavelength optical signals at a plurality of node devices on the optical transmission line;

and testing the transmission performance of the optical transmission line according to the power value of the multi-wavelength optical signal at the plurality of node devices and the power design allowance corresponding to the plurality of node devices.

15. The method of claim 14, further comprising:

controlling the multichannel light source to close a specified optical channel, wherein the specified optical channel is used for generating optical signals with specified wavelengths in the multi-wavelength optical signals;

acquiring a power value at a first node device before and after a specified optical channel is closed, wherein the first node device is any node device on the optical transmission line;

calculating the optical signal-to-noise ratio of the specified optical channel according to the power value of the specified optical channel at the first node device before and after the specified optical channel is closed;

and testing the transmission performance of the optical transmission line according to the optical signal-to-noise ratio of the appointed optical channel.

16. The method of claim 15, wherein controlling the multi-channel light source to turn off the designated light channel comprises:

and sending a closing instruction to the multi-channel light source through an OSC, wherein the closing instruction carries a channel identifier of the specified optical channel to indicate the multi-channel light source to close the specified optical channel.

17. The method according to any one of claims 10-13, further comprising, prior to accessing the multi-channel light source into the optical transmission line to be tested:

accessing an optical terminal device to the optical transmission line, controlling the optical terminal device to output an optical signal with a reference wavelength to the optical transmission line, and recording the transmission condition of the optical signal with the reference wavelength on the optical transmission line;

before controlling the multi-channel light source to generate a multi-wavelength optical signal meeting the test requirement, the method further comprises the following steps:

and performing power calibration on each single-wavelength optical signal output by the multi-channel optical source according to the transmission condition of the optical signal with the reference wavelength on the optical transmission line.

18. The method of claim 17, wherein recording the transmission of an optical signal at a reference wavelength on the optical transmission line comprises:

recording the power value of an optical signal with a reference wavelength at a second node device, wherein the second node device is any node device on the optical transmission line;

according to the transmission condition of the optical signal with the reference wavelength on the optical transmission line, performing power calibration on each single-wavelength optical signal output by the multi-channel optical source, including:

controlling the multichannel light source to output optical signals with a first wavelength which is the same as the reference wavelength, and blocking the optical signals with other wavelengths;

adjusting the attenuation value of the multichannel optical source to the optical signal with the first wavelength, so that the power value of the optical signal with the first wavelength at the second node device is equal to the power value of the optical signal with the reference wavelength at the second node device;

and adjusting the attenuation values of the multi-channel light source to the optical signals with other wavelengths according to the attenuation value of the multi-channel light source to the optical signal with the first wavelength.

19. The method of claim 18, wherein adjusting the attenuation values of the multi-channel light source for the optical signals at the other wavelengths based on the attenuation values of the multi-channel light source for the optical signals at the first wavelength comprises:

when the power value of the optical signal with the first wavelength at the second node equipment is equal to the power value of the optical signal with the reference wavelength at the second node equipment, recording the power value of the multichannel light source on a monitoring port when the multichannel light source outputs the optical signal with the first wavelength;

and controlling the multichannel light source to sequentially output optical signals with other wavelengths, and adjusting attenuation values of the multichannel light source to the optical signals with other wavelengths, so that the power value of a monitoring port of the multichannel light source when outputting the optical signals with other wavelengths is equal to the power value of the monitoring port of the multichannel light source when outputting the optical signals with the first wavelength.

20. A computer-readable storage medium storing a computer program, the computer program, when executed by one or more processors, being capable of performing the steps of the method of any one of claims 10 to 19.