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Generalized Rayleigh quotient optimization method for inter-channel nonlinearity compensation in coherent optical
Optics Letters
|February 1, 2024
Summary
We introduce a new method for compensating inter-channel nonlinearity in wavelength division multiplexing (WDM) systems. The generalized Rayleigh quotient optimization (GRQO) method improves signal quality over long-distance fiber optic transmissions.
Area of Science:
- Optical Communications
- Signal Processing
- Nonlinear Optics
Background:
- Inter-channel nonlinearity poses a significant challenge in wavelength division multiplexing (WDM) systems, limiting transmission capacity and reach.
- Effective compensation is vital for enhancing the performance of modern optical networks.
Purpose of the Study:
- To propose and evaluate a novel method for inter-channel nonlinearity compensation in WDM systems.
- To demonstrate the effectiveness of the generalized Rayleigh quotient optimization (GRQO) method in improving signal quality.
Main Methods:
- Development of the generalized Rayleigh quotient optimization (GRQO) method with two distinct operational modes.
- Experimental validation in an 8 × 64 GBaud 16-ary quadrature amplitude modulation (16-QAM) system.
- Comparison against the nonlinear polarization crosstalk canceller (NPCC) over 1600 km of standard single-mode fiber (SSMF).
Main Results:
- The GRQO method achieved a 0.40 dB Q² factor improvement compared to the NPCC.
- The proposed method demonstrated a moderately low computational complexity of approximately 2000 real multiplications per bit (RMb).
- Successful compensation of inter-channel nonlinearities was observed in a high-capacity WDM system.
Conclusions:
- The GRQO method offers a promising solution for inter-channel nonlinearity compensation in WDM systems.
- GRQO provides a favorable trade-off between performance improvement and computational complexity.
- This advancement contributes to enhanced transmission capacity and distance in optical communication systems.
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