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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 6 — Mar. 16, 2009
  • pp: 4306–4316

Theoretical investigation of polarization-insensitive data format conversion of RZ-OOK to RZ-BPSK in a nonlinear birefringent fiber

C. C. Wei, W. Astar, J. Chen, Y.-J. Chen, and G. M. Carter  »View Author Affiliations


Optics Express, Vol. 17, Issue 6, pp. 4306-4316 (2009)
http://dx.doi.org/10.1364/OE.17.004306


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Abstract

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 n 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 π/3 if 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° 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 Poincaré sphere. These conclusions are in good agreement with recently published experimental results.

© 2009 Optical Society of America

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(260.1440) Physical optics : Birefringence

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: January 6, 2009
Revised Manuscript: February 23, 2009
Manuscript Accepted: February 24, 2009
Published: March 3, 2009

Citation
C. C. Wei, W. Astar, J. Chen, Y. J. Chen, and G. M. Carter, "Theoretical investigation of polarizationinsensitive data format conversion of RZ-OOK to RZ-BPSK in a nonlinear birefringent fiber," Opt. Express 17, 4306-4316 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-6-4306


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