EP-4742559-A1 - LIGHTLESS PATH DETECTION METHOD AND DETECTION SYSTEM, CONTROLLER, AND MEDIUM

EP4742559A1EP 4742559 A1EP4742559 A1EP 4742559A1EP-4742559-A1

Abstract

The present application discloses a lightless path detection method and detection system, a controller, and a medium. The detection method is applied to an optical transceiver assembly in a lightless path, and the optical transceiver assembly is provided with probe light. The method comprises: by means of probe light, acquiring first power spectrum data of an output end of the current optical transceiver assembly and second optical power spectrum data of an input end of a downstream optical transceiver assembly of the current optical transceiver assembly (S110); calibrating optical parameters of an optical layer model on the basis of the first power spectrum data and the second power spectrum data to obtain an optimized target optical layer model (S120); and in response to a service being switched to a lightless path, determining an optical signal-to-noise ratio of the lightless path on the basis of the target optical layer model (S130).

Inventors

YAN, Baoluo
ZHOU, Jinlong
SHI, Hu

Assignees

ZTE Corporation

Dates

Publication Date: 20260513
Application Date: 20240409

Claims (13)

A method for detecting an unlit path, which is applied to an optical transceiver assembly arranged in the unlit path, wherein the optical transceiver assembly is provided with a probe light, and the method comprises: acquiring first optical power spectrum data at an output end of a current optical transceiver assembly, and second optical power spectrum data at an input end of a downstream optical transceiver assembly of the current optical transceiver assembly by means of the probe light; calibrating optical parameters of a plurality of optical layer models based on the first optical power spectrum data and the second optical power spectrum data to obtain a plurality of optimized target optical layer models; and determining an optical signal-to-noise ratio (OSNR) of the unlit path based on the target optical layer models, in response a service switching to the unlit path.
The method as claimed in claim 1, wherein the optical layer models comprise, an optical fiber Raman model, an insertion loss model, and an optical amplifier model, and calibrating the optical parameters of the plurality of optical layer models based on the first optical power spectrum data and the second optical power spectrum data to obtain the plurality of optimized target optical layer models, comprises: calibrating the optical parameters in the fiber Raman model based on the first optical power spectrum data to obtain an optimized target fiber Raman model and a first fiber output power spectrum; calibrating the optical parameters in the insertion loss model to obtain an optimized target insertion loss model and a first insertion loss output power spectrum, based on the first fiber output power spectrum and a total input power reported from the unlit path; calibrating the optical parameters in the optical amplifier model to obtain an optimized target optical amplifier model and a first amplifier output power spectrum, based on the first insertion loss output power spectrum and the total output power reported from the unlit path; and determining the target fiber Raman model, the target insertion loss model and the target optical amplifier model as target optical layer models, in response to determining that a power error determined based on the first amplifier output power spectrum and the second optical power spectrum data is less than a preset power threshold.
The method as claimed in claim 2, wherein after acquiring the optimized target optical amplifier model and the first amplifier output power spectrum, the method further comprises: acquiring a calibration difference based on the power error and a number of optical transmission segments of the unlit path , in response to determining that the power error is greater than or equal to a preset power threshold based on the first amplifier output power spectrum and the second optical power spectrum data, wherein the power error is a difference between the first amplifier output power spectrum and the second optical power spectrum data; and performing an error calibration on the target fiber Raman model based on the calibration difference, and calibrating the optical parameters in the calibrated target fiber Raman model, the optical parameters in the target insertion loss model, and the optical parameters in target optical amplifier model, such that the calibrated power error is less than the preset power threshold.
The method as claimed in claim 2, wherein before determining that the power error determined based on the first amplifier output power spectrum and the second optical power spectrum data is less than the preset power threshold, the method further comprises: calibrating the optical parameters of the optical layer models corresponding to fiber segments and optical amplifiers along the unlit path that are yet to be passed through by the probe light, based on the first amplifier output power spectrum, before the first amplifier output power spectrum reaches the input end of the downstream optical transceiver assembly; and determining whether the power error determined by the first amplifier output power spectrum and the second optical power spectrum data is less than the preset power threshold, in response to determining the first amplifier output power spectrum reaches the input end of the downstream optical transceiver assembly.
The method as claimed in claim 2, wherein the optical parameters in the fiber Raman model comprises at least one of, wavelength-dependent fiber loss, or fiber Raman coefficient; the optical parameters in the insertion-loss model comprises device wavelength-dependent loss; and the optical parameters in the optical amplifier model comprises at least one of, amplifier gain spectral function variable, amplifier noise figure spectral function variable, or amplifier spectral hole-burning function variable.
The method as claimed in claim 1, wherein determining the OSNR of the unlit path based on the target optical layer models, comprises: acquiring a third optical power spectrum data at an input end of the current optical transceiver assembly through the probe light; and inputting the third optical power spectrum data into the target optical layer models to acquire a target path power and the OSNR of the unlit path.
The method as claimed in claim 6, wherein the plurality of target optical layer models comprises, a target optical fiber Raman model, a target insertion loss model, and a target optical amplifier model, and inputting the third optical power spectrum data into the target optical layer models to acquire the target path power and the OSNR of the unlit path, comprises: inputting the third optical power spectrum data into the target fiber Raman model to acquire a second fiber output power spectrum; inputting the second fiber output power spectrum into the target insertion loss model to acquire a second insertion loss output power spectrum; inputting the second insertion loss output power spectrum into the target optical amplifier model to acquire a second amplifier output power spectrum; and determining the second amplifier output power spectrum as the target path power of the unlit path, and acquiring the OSNR based on the target path power, in response to determining that the second amplifier output power spectrum reaches the input end of the downstream optical transceiver assembly.
The method as claimed in claim 7, wherein after acquiring the second amplifier output power spectrum, the method further comprises: before the second amplifier output power spectrum does not reach the input end of the downstream optical transceiver assembly, iteratively inputting the second amplifier output power spectrum into the optical layer models of fiber segments and optical amplifiers on the unlit path that are yet to be passed through by the probe light, and acquiring an output, until the second amplifier output power spectrum reaches the input end of the downstream optical transceiver assembly, and determining the second amplifier output power spectrum as the target path power in response to determining that the second amplifier output power spectrum reaches the input end of the downstream optical transceiver assembly.
The method as claimed in claim 1, wherein the unlit path comprises a plurality of unlit links, and the method comprises: calibrating the optical parameters of the plurality of optical layer models for the plurality of unlit links based on the first optical power spectrum data and the optical second power spectrum data to obtain optimized target optical layer models for each unlit link; determining a per-link OSNR of each of the unlit links based on a respective one of the target optical layer models; and determining an overall OSNR of the unlit path based on each per-link OSNR of the respective one of the unlit links.
A system for detecting an unlit path, comprising: a probe light, which is configured to acquire first optical power spectrum data at an output end of a current optical transceiver assembly, and second optical power spectrum data at an input end of a downstream optical transceiver assembly of the current optical transceiver assembly; and an optical transceiver assembly, which is configured to calibrate optical parameters of an optical layer model based on the first optical power spectrum data and the optical second power spectrum data to obtain an optimized target optical layer model; and to determine an optical signal-to-noise ratio (OSNR) of the unlit path based on the target optical layer model in response to a service switching to the unlit path.
The system as claimed in claim 10, wherein the optical probe light is further configured to acquire third optical power spectrum data at an input end of the current optical transceiver assembly in response to the service switching to the unlit path; wherein, the third power spectrum data is set as an input to the target optical layer model so as to obtain the OSNR and a target channel power of the unlit path based on the target optical layer model.
A controller, comprising a memory, a processor and a computer program stored in the memory and executable by the processor which, when executed by the processor, causes the processor to carry out the method as claimed in any one of claims 1 to 9.
A computer-readable storage medium storing a computer-executable instruction which, when executed by a processor, causes the processor to carry out the method of any one of claims 1 to 9.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is filed on the basis of the Chinese patent application No. 2023109606514 filed July 31, 2023, and claims priority of the Chinese patent application, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to the field of optical communication and sensing, and in particular to a method for detecting an unlit path, a detection system, a controller, and a medium. BACKGROUND The Quality of Transmission (QoT) of an optical system is a comprehensive measure of the transmission performance and reliability of optical signals within an optical network system. In existing optical network systems, QoT evaluation is primarily performed by collecting performance parameters at each node, such as channel optical power, service code pattern, fiber type and length, amplifier type, and gain setting, and combining these parameters with impairment models of the optical system, including amplifiers, fibers, and optical modules. Through this approach, the performance of any node within the optical network can be sensed and optimized, which provides significant application value in optical network operation and maintenance. However, in practical applications, the generalization capability of the model faces multiple challenges, such as variations in fiber attenuation due to aging, degradation of device performance, and periodic temperature fluctuations. In existing optical networks, the built-in calibration data of underlying device models is often difficult to obtain and typically empirical values are relied on. As a result, current detection methods for standby/unlit path scenarios exhibit limitations in calibrating undetermined parameters of the model. These limitations constrain the accuracy of existing unlit path detection methods and hinder high-precision estimation of key data such as optical signal-to-noise ratio (OSNR) during service routing recovery in optical network operation and maintenance, thereby reducing the success rate of service routing recovery. SUMMARY The following is a summary of the subject matter described herein. This summary is not intended to limit the scope of protection of the claims. Provided are a method for detecting an unlit path, a detection system, a controller, and a medium in various embodiments of the present disclosure. According to a first aspect of the present disclosure, a method for detecting an unlit path is provided. The method is applied to an optical transceiver assembly arranged in the unlit path. The optical transceiver assembly is provided with a probe light. The method includes: -acquiring first optical power spectrum data at an output end of a current optical transceiver assembly, and second optical power spectrum data at an input end of a downstream optical transceiver assembly of the current optical transceiver assembly by means of the probe light;-calibrating optical parameters of a plurality of optical layer models based on the first optical power spectrum data and the second optical power spectrum data to obtain a plurality of optimized target optical layer models;- and determining an optical signal-to-noise ratio (OSNR) of the unlit path based on the target optical layer models, in response a service switching to the unlit path. According to a second aspect of the present disclosure, a system for detecting an unlit path is provided. The system includes: -a probe light, which is configured to acquire first optical power spectrum data at an output end of a current optical transceiver assembly, and second optical power spectrum data at an input end of a downstream optical transceiver assembly of the current optical transceiver assembly; and -an optical transceiver assembly, which is configured to calibrate optical parameters of an optical layer model based on the first optical power spectrum data and the second optical power spectrum data to obtain an optimized target optical layer model; and to determine an optical signal-to-noise ratio (OSNR) of the unlit path based on the target optical layer model in response to a service switching to the unlit path. According to a third aspect of the present disclosure, a controller is provided. The controller includes a memory, a processor, and a computer program stored in the memory and executable on the processor which, when is executed by the processor, causes the processor to carry out any one of the methods described above. According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer-executable instruction which, when executed by a processor causes the processor to carry out any one of the methods as described above. Other features and advantages of the present invention will be illustrated in the following description, and in part will be apparent from the description, or may be understood by practicing the present inve