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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 23 — Nov. 8, 2010
  • pp: 23829–23836

Signed frequency offset measurement for direct detection DPSK system with a chromatic dispersion offset

Jian Zhao, Alan Pak Tao Lau, Khurram Karim Qureshi, Chao Lu, X. R. Ma, H. Y. Tam, and P. K. A. Wai  »View Author Affiliations


Optics Express, Vol. 18, Issue 23, pp. 23829-23836 (2010)
http://dx.doi.org/10.1364/OE.18.023829


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Abstract

We demonstrated a method for the measurement of signed frequency offset between optical source and delay interferometer (DI) for 10Gb/s DPSK signals based on asynchronous delay-tap sampling technique with a chromatic dispersion (CD) offset. The demodulated DPSK signals show asymmetrical property and amplitude shoulder appears on the waveforms with frequency offset and a fixed CD offset together. The delay-tap sampling scatter plots also show the asymmetry related to the asymmetrical signal distortion. Our proposed method cannot only realize the measurement of the magnitude of frequency offset but also the polarity. The measurement range is from −2GHz to + 2GHz and the sensitivity can reach ± 100MHz. The simulation and experimental results are demonstrated and in good agreement.

© 2010 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.5060) Fiber optics and optical communications : Phase modulation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: April 19, 2010
Revised Manuscript: July 27, 2010
Manuscript Accepted: July 27, 2010
Published: October 27, 2010

Citation
Jian Zhao, Alan Pak Tao Lau, Khurram Karim Qureshi, Chao Lu, X. R. Ma, H. Y. Tam, and P. K. A. Wai, "Signed frequency offset measurement for direct detection DPSK system with a chromatic dispersion offset," Opt. Express 18, 23829-23836 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-23-23829


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