標題: Theoretical investigation of polarization-insensitive data format conversion of RZ-OOK to RZ-BPSK in a nonlinear birefringent fiber
作者: Wei, C. C.
Astar, W.
Chen, J.
Chen, Y. -J.
Carter, G. M.
光電工程學系
光電工程研究所
Department of Photonics
Institute of EO Enginerring
公開日期: 16-三月-2009
摘要: Polarization-insensitive conversion of return-to-zero (RZ) ON-OFF keying (RZ-OOK) to RZ binary phase-shift keying (RZ-BPSK) has been achieved by cross-phase modulation (XPM) in a nonlinear birefringent fiber. This work presents a theoretical analysis of the dependence of format conversion on pump-probe detuning, and the pump state-of-polarization (SOP) that can fluctuate unpredictably in a realistic system. An investigation of the impact of pump polarization fluctuation on receiver sensitivity and receiver optimal threshold for the converted RZ-BPSK probe is also carried out. It was found that although the desired XPM-induced pi phase shift can be achieved by launching both the RZ-OOK pump and the probe along the same birefringent axis of the fiber, the phase shift degrades to pi/3 the SOP of the RZ-OOK pump unpredictably switches to the other axis of the fiber, resulting in a large receiver sensitivity penalty fluctuation of 14 dB. By contrast, launching the probe at 45 degrees relative to the birefringent axes can reduce the polarization-dependent receiver sensitivity penalty fluctuation to about 2 dB as the SOP of the RZ-OOK pump is swept over the Poincare sphere. These conclusions are in good agreement with recently published experimental results. (C) 2009 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.17.004306
http://hdl.handle.net/11536/7476
ISSN: 1094-4087
DOI: 10.1364/OE.17.004306
期刊: OPTICS EXPRESS
Volume: 17
Issue: 6
起始頁: 4306
結束頁: 4316
顯示於類別:期刊論文


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