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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 17 — Aug. 18, 2008
  • pp: 13398–13404

Measurement of PMD tolerance in 40-Gb/s polarization-multiplexed RZ-DQPSK

Pierpaolo Boffi, Maddalena Ferrario, Lucia Marazzi, Paolo Martelli, Paola Parolari, Aldo Righetti, Rocco Siano, and Mario Martinelli  »View Author Affiliations

Optics Express, Vol. 16, Issue 17, pp. 13398-13404 (2008)

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We experimentally investigate the first-order polarization-mode dispersion (PMD) tolerance of two polarization-multiplexed (POLMUX) RZ-DQPSK signals at overall 40 Gb/s. The polarization demultiplexing is enabled by an automatic endless polarization stabilizer. Time-interleaving the two orthogonally polarized RZ-DQPSK signals minimizes the crosstalk due to the non-ideal polarization stabilization, while it represents the worst-case for the PMD-induced crosstalk. Bit-error rate measurements are performed both in back-to-back and after 25-km standard single-mode fiber. The PMD tolerance is evaluated as a function of the instantaneous differential group delay, introduced by a first-order PMD emulator. 40-Gb/s POLMUX RZ-DQPSK is more sensitive to PMD than single-polarization 20-Gb/s DQPSK, while it is more PMD-tolerant than 40-Gb/s NRZ-OOK. Besides, its chromatic dispersion robustness is similar to the single-polarization 20-Gb/s DQPSK. The combination of POLMUX and DQPSK is therefore very promising in view of transmission systems at high bit-rate.

© 2008 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4230) Fiber optics and optical communications : Multiplexing

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 28, 2008
Revised Manuscript: July 17, 2008
Manuscript Accepted: August 13, 2008
Published: August 15, 2008

Pierpaolo Boffi, Maddalena Ferrario, Lucia Marazzi, Paolo Martelli, Paola Parolari, Aldo Righetti, Rocco Siano, and Mario Martinelli, "Measurement of PMD tolerance in 40-Gb/s polarization-multiplexed RZ-DQPSK," Opt. Express 16, 13398-13404 (2008)

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