Optical Signal Phase Rotation Compensation Circuit Scale Reduction
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Solution Overview
Problem
Current signal processing devices for optical communication systems, such as those using Perturbation Back Propagation, require a larger circuit scale due to the need for multiple filter and phase modulation circuits to compensate for phase rotations caused by signal strength and perturbative components, leading to increased complexity and size.
Innovation Solution
A signal processing device that processes two polarization signals by separately compensating for phase rotations due to signal strength and perturbative components, using a first compensation unit to calculate and filter the phase rotation based on signal strength and a second unit to calculate and filter the phase rotation based on the perturbative component, with phase modulation units to cancel these rotations, thereby reducing the overall circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Perturbation Back Propagation is used to compensate for phase rotation due to signal strength and perturbative component, then phase rotation cancellation is improved, but the circuit scale increases due to requiring three times more filter circuits and two times more phase modulation circuits compared to Filtered Back Propagation
Solution Approach 1:
The patent combines the first amount of phase rotation (due to signal strength) and the second amount of phase rotation (due to perturbative component) into a single composite phase rotation value. By adding these two phase rotation amounts together to form a combined phase rotation, the system can cancel both types of phase rotation using a single phase modulation circuit instead of requiring separate circuits for each type, thereby reducing the overall circuit scale while maintaining effective phase rotation cancellation.
2Device complexity
If the number of nonlinear compensation stages is reduced, then the circuit scale is reduced, but the dispersion compensation function and nonlinear compensation function cannot be properly combined
Solution Approach 1:
The patent performs preliminary dispersion compensation using a linear distortion compensation circuit (including FFT/IFFT) before performing nonlinear compensation. By pre-compensating for dispersion effects, the subsequent nonlinear compensation stages can focus solely on correcting phase rotation due to nonlinear effects, allowing for fewer nonlinear compensation stages while maintaining overall compensation effectiveness.
Solution Approach 2:
The patent divides the compensation process into distinct functional segments: a linear distortion compensation stage for dispersion compensation and separate nonlinear compensation stages for phase rotation correction. This segmentation allows each stage to be optimized independently, with the linear stage handling dispersion and the nonlinear stages handling phase rotation, enabling efficient combination of both compensation functions.
Data Source
AI summary
A nonlinear compensation unit (300) includes a first compensation unit (350) and a second compensation unit (360). The first compensation unit (350) compensates for each of two polarization signals Ex and Ey so as to cancel a first amount of phase rotation which is the amount of phase rotation calculated based on the signal strength of the two polarization signals Ex and Ey. The second compensation unit (360) compensates for each of the two polarization signals Ex and Ey so as to cancel a second amount of phase rotation which is the amount of phase rotation calculated based on the perturbative component of the two polarization signals Ex and Ey. The first compensation unit (350) includes a strength calculation unit (302), a first filter unit (304), and a first phase modulation unit (306). The second compensation unit (360) includes a perturbative component calculation unit (316), a second filter unit (318), a second phase modulation unit (322), and a third phase modulation unit (330).