Idle-Channel OSNR Measurement Using Adjustable ASE Signal Width
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Solution Overview
Problem
Existing optical transport network (OTN) technologies face challenges in monitoring the optical performance of idle channels, as there are no service optical signals present, making it difficult to predict and ensure the survivability of services when they are switched to these channels.
Innovation Solution
An OSNR measurement method is provided that adjusts the signal width of a measurement light source to measure idle channels by acquiring total channel power and noise power at OPM points, using a tunable laser source or spontaneous emission source with an optical filter, to calculate the OSNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical performance detection technologies are used, then service optical signal parameters can be measured, but idle channels cannot be monitored due to absence of service signals
Solution Approach 1:
A measurement light source is introduced as an intermediary to generate measurement light that simulates service optical signals in idle channels. This measurement light passes through the optical path and is detected by the OPM device, enabling indirect monitoring of channels that would otherwise have no signals present
Solution Approach 2:
The measurement light source generates measurement light that copies the characteristics of actual service optical signals, including wavelength and power levels. This allows the OPM device to measure performance parameters on idle channels as if real services were present, enabling accurate performance prediction
2Measurement precision
If a measurement light source is used to measure idle channels, then OSNR can be measured, but measurement accuracy is affected by signal width mismatch with channel bandwidth
Solution Approach 1:
The measurement light source is designed with dynamically adjustable signal width that can be adapted to match different channel spectral bandwidths. This dynamic adjustment capability ensures optimal measurement accuracy for various channel configurations without requiring multiple fixed-width light sources
Solution Approach 2:
The signal width parameter of the measurement light source is changed to match the spectral bandwidth of the channel being measured. By adjusting this key parameter, the measurement system achieves optimal OSNR measurement accuracy for different channel specifications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate OSNR measurement of idle channels, improving network maintenance and management by simulating service scenarios and correcting for actual transmission path OSNR values, thereby enhancing network survivability.
Implementation Method 1
adjusting the measurement light source to an Amplified Spontaneous Emission (ASE) state
Data Source
AI summary
An OSNR measurement method and apparatus, and a computer storage medium are disclosed. The OSNR measurement method may include: adjusting a measurement light source to an ASE state (S100); adjusting a signal width of the measurement light source to a first width according to a spectral bandwidth of a channel to be measured, and acquiring a total channel power at an OPM point of a receive-end station (S200); adjusting the signal width of the measurement light source to a second width, and acquiring a noise power at the OPM point of the receive-end station (S300), where the second width is less than the first width, and center frequencies of signals corresponding to the first width and the second width are staggered apart from each other; and determining an OSNR of the channel to be measured according to the total channel power and the noise power (S400).