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Published on: February 28, 2016
Intrachannel nonlinearity enhancement in polarization multiplexed phase modulated systems with differential detection
1Department of Electrical and Information Engineering, via Gronchi 18, University of L’Aquila, 67100 L’Aquila, Italy. antonio.mecozzi@univaq.it
Polarization multiplexing in phase-modulated systems degrades performance due to cross-polarized component interactions. Without it, differential receivers are insensitive to two-pulse cross-phase modulation, improving signal quality.
Area of Science:
- Optical communications
- Nonlinear optics
Background:
- Phase-modulated transmission systems are susceptible to nonlinear impairments.
- Polarization multiplexing is used to increase data capacity in optical networks.
Purpose of the Study:
- To compare nonlinear impairments in phase-modulated transmission with and without polarization multiplexing.
- To analyze the impact of two-pulse cross-phase modulation on system performance.
Main Methods:
- Developed an analytic approach to predict the Q factor at the receiver.
- Simulated phase-modulated signals with and without polarization multiplexing.
Main Results:
- Without polarization multiplexing, the differential receiver is insensitive to two-pulse cross-phase modulation.
- With polarization multiplexing, two-pulse interactions between cross-polarized components cause significant performance degradation.
Conclusions:
- Polarization multiplexing introduces performance limitations in phase-modulated systems due to nonlinear interactions.
- Careful system design is needed to mitigate these impairments for future optical networks.
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