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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 1 — Jan. 8, 2007
  • pp: 33–44

Dynamic range enhancement of a novel phase-locked coherent optical phase demodulator

Darko Zibar, Leif A. Johansson, Hsu-Feng Chou, Anand Ramaswamy, and John E. Bowers  »View Author Affiliations


Optics Express, Vol. 15, Issue 1, pp. 33-44 (2007)
http://dx.doi.org/10.1364/OE.15.000033


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Abstract

We report on a novel cancellation technique, for reducing the nonlinearity associated with the tracking phase-modulator in recently proposed phase-locked coherent demodulator for phase modulated analog optical links. The proposed cancellation technique is input RF signal power and frequency independent leading to a significant increase in dynamic range of the coherent demodulator. Furthermore, this technique demonstrates that large values of the signal-to-intermodulation ratio of the demodulated signal can be obtained even though the tracking phase modulator is fairly nonlinear, and thereby relaxing the linearity requirements for the tracking phase modulator. A new model is developed and the calculated results are in good agreement with measurements.

© 2007 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(120.5060) Instrumentation, measurement, and metrology : Phase modulation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 21, 2006
Revised Manuscript: November 15, 2006
Manuscript Accepted: December 16, 2006
Published: January 8, 2007

Citation
Darko Zibar, Leif A. Johansson, Hsu-Feng Chou, Anand Ramaswamy, and John E. Bowers, "Dynamic range enhancement of a novel phase-locked coherent optical phase demodulator," Opt. Express 15, 33-44 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-1-33


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References

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