Optical Receiver Compensation for Periodic Copropagating Signal Distortion
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Solution Overview
Problem
Existing fiber-optic communication systems face challenges in accurately compensating for signal distortions caused by periodic copropagating optical signals, particularly due to non-linear effects like self-phase modulation and cross-phase modulation, which limit network monitoring capabilities and transmission performance.
Innovation Solution
A method and system at the optical receiver to determine the period of the distortion caused by a periodic copropagating optical signal using mathematical techniques, such as the Gregory-Loredo algorithm, and generate a compensation signal to correct the distorted optical carrier signal without requiring full knowledge of the copropagating signal's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If copropagating optical signals are used for network monitoring, then monitoring capabilities are improved, but signal distortions occur due to non-linear effects
Solution Approach 1:
The patent detects the periodic distortion pattern caused by the copropagating monitoring signal and uses this periodicity to generate a compensation signal. The harmful distortion is converted into useful information about the monitoring signal's characteristics, which is then used to create a compensating signal that removes the distortion from the received optical signal.
Solution Approach 2:
The system performs feedback by detecting the periodic distortion in the received signal, determining the characteristics of the copropagating monitoring signal from this distortion, generating a compensation signal based on these characteristics, and applying it to correct the received signal. This closed-loop approach continuously improves monitoring accuracy while compensating for distortions.
2Length of stationary object
If higher power copropagating signals are used, then monitoring range is extended, but signal distortion increases
Solution Approach 1:
The patent transforms the distortion caused by high-power copropagating signals into useful information. By detecting the periodic pattern of the distortion, the system determines the characteristics of the monitoring signal and generates a compensation signal that eliminates the distortion, thereby enabling extended monitoring range without sacrificing signal quality.
Solution Approach 2:
The system changes the parameter of the received signal by applying a compensation signal that modifies its phase or amplitude to counteract the periodic distortion. This parameter transformation allows the system to maintain signal integrity even when high-power copropagating monitoring signals are present.
3Measurement precision
If full knowledge of copropagating signal characteristics is required for compensation, then compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential characteristics of the copropagating monitoring signal from the distorted received signal. Instead of requiring full knowledge of the monitoring signal, the system extracts the periodicity and other key parameters from the distortion pattern itself, using this extracted information to generate an effective compensation signal.
Solution Approach 2:
The system performs self-service by using the distortion pattern in the received signal itself to determine the characteristics of the copropagating monitoring signal. The received signal contains embedded information about the monitoring signal through its periodic distortion, and the system uses this self-contained information to generate the necessary compensation without external input.
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 effective compensation of signal distortions at the receiver, allowing higher power copropagating signals with improved transmission quality and extended monitoring range, reducing the need for additional bandwidth and network node communication.
Implementation Method 1
signal distortions induced on an optical carrier signal by a periodic copropagating optical signal... due to non-linear effects like self-phase modulation
Implementation Method 2
signal distortions induced on an optical carrier signal by a periodic copropagating optical signal... due to non-linear effects like cross-phase modulation
Data Source
Figure 1a~1d
Figure 2
Figure 3
AI summary
The disclosure relates to a method, an optical receiver and an optical system for compensating, at an optical receiver, signal distortions induced in an optical carrier signal by a periodic copropagating optical signal, wherein the optical carrier signal and the copropagating signal copropagate at least in part of an optical system or network, by: receiving, at the optical receiver, the optical carrier signal, wherein the optical carrier signal is distorted by the copropagating signal; determining, at the optical receiver, a period of a periodic component of the distorted optical carrier signal; determining, at the optical receiver, a periodic distortion of the distorted optical carrier signal; and generating a compensation signal to correct the distorted optical carrier signal according to the determined periodic distortion.