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Nonlinear effects in high-spectral-efficiency transmission using differential polarization-phase-shift keying
1College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA. yanhan@creol.ucf.edu
Optics Letters
|September 1, 2005
Summary
Optical nonlinearities impact differential polarization-phase-shift keying (DPolPSK) signal transmission. Differential detection effectively mitigates polarization scattering in DPolPSK systems, especially in dense wavelength-division multiplexing.
Area of Science:
- Optical communications
- Nonlinear fiber optics
- Signal processing
Background:
- Optical nonlinearities pose challenges for high-speed fiber optic communication systems.
- Differential polarization-phase-shift keying (DPolPSK) is a robust modulation format, but its performance can be affected by fiber nonlinearities.
Purpose of the Study:
- To analyze the impact of optical nonlinearities on DPolPSK signal transmission.
- To investigate the dominant nonlinear effects in single-channel and dense wavelength-division multiplexing (DWDM) scenarios.
- To evaluate the effectiveness of differential detection in mitigating these effects.
Main Methods:
- Theoretical analysis of self-phase modulation (SPM) for different DPolPSK orders.
- Analysis of cross-phase modulation (XPM)-induced polarization scattering in DWDM systems.
- Comparison of DPolPSK performance with and without differential detection.
Main Results:
- SPM effects on DPolPSK depend on the modulation order.
- XPM-induced polarization scattering is the primary nonlinearity in DWDM DPolPSK, occurring even without intensity noise.
- Differential detection significantly reduces polarization scattering in DPolPSK systems.
- Polarization scattering is sensitive to channel spacing and bit rate in DWDM.
Conclusions:
- Optical nonlinearities, particularly XPM-induced polarization scattering, are critical factors in DWDM DPolPSK transmission.
- Differential detection offers a viable solution for mitigating nonlinear impairments in DPolPSK systems.
- System design parameters like channel spacing and bit rate must be carefully considered to manage nonlinear effects.
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