Coherent Optical Receiver AMCC Signal Separation
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Solution Overview
Problem
In digital coherent transmission systems, the separation of the main signal and the auxiliary management and control channel (AMCC) signal at the optical stage results in decreased reception light intensity and deteriorated noise characteristics in the coherent receiver.
Innovation Solution
A coherent optical reception device and method that involves a coherent receiver to convert signal light into analog electric signals and output in-phase and quadrature-phase components, followed by a digital signal processor that demodulates the AMCC and main signals by removing the main signal and clock components from the reception signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separation of main signal and AMCC signal is performed at optical stage, then signal separation is achieved, but reception light intensity decreases and noise characteristics deteriorate
Solution Approach 1:
The patent replaces the optical-stage separation mechanism with a digital signal processing mechanism. Instead of using optical filters or beam splitters to separate signals, the system uses electronic DSP algorithms to separate the main signal and AMCC signal after photodetection, thereby avoiding optical loss and maintaining reception light intensity.
Solution Approach 2:
The patent changes the domain of signal separation from optical domain to electrical/digital domain. By performing separation in the digital domain after analog-to-digital conversion, the system avoids the optical loss inherent in optical-stage separation while achieving effective signal separation through digital processing.
2Reliability
If separation of main signal and AMCC signal is performed at optical stage, then signal separation is achieved, but noise characteristics deteriorate
Solution Approach 1:
The patent replaces the optical separation mechanism with digital signal processing to avoid adding optical noise. The DSP-based separation occurs after photodetection, eliminating the introduction of optical loss and associated noise that would occur with optical-stage separation components.
Solution Approach 2:
The patent performs signal separation as a preliminary digital processing step after photodetection but before final signal reconstruction. This allows the system to separate signals in the digital domain where noise can be more effectively managed and filtered without degrading the overall noise characteristics.
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 separation of the superimposed AMCC signal and main signal at the digital signal processor stage, improving noise characteristics and maintaining reception light intensity.
Implementation Method 1
converts the signal light into an analog electric signal
Data Source
AI summary
A coherent optical reception device includes a coherent receiver that receives signal light in which an AMCC signal is superimposed on a main signal by phase modulation and outputs a reception signal and a digital signal processor, in which a modulation signal of the AMCC signal superimposed on the main signal is multiplied by a clock, the digital signal processor includes a symbol output, an AMCC signal code sequence demodulator, and a main signal code sequence demodulator, and the AMCC signal code sequence demodulator includes a main signal component remover that removes the main signal included in the reception signal output from the symbol output, and a clock component remover that removes a clock component included in the reception signal from which the main signal has been removed by the main signal component remover.