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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 26 — Dec. 12, 2011
  • pp: B687–B701

Simultaneous clock recovery and dispersion, OSNR monitoring for 112-Gbit/s NRZ-DQPSK using frequency down-conversion electro-optical phase-locked loop

He Wen, Lin Cheng, Jinxin Liao, Xiaoping Zheng, Hanyi Zhang, Yili Guo, and Bingkun Zhou  »View Author Affiliations

Optics Express, Vol. 19, Issue 26, pp. B687-B701 (2011)

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A cost effective clock recovery scheme simultaneously providing signal performance monitoring is proposed for high speed electrical time domain multiplexing (ETDM) transmission systems to release the bandwidth requirement on the involved electrical devices. In the scheme, we first convert the clock frequency down in the optical domain using electroptic modulation, and then extract the clock with a phase locked loop (PLL) after photo-detection. All the devices involved are operated at frequencies lower than half of the symbol rate. Furthermore, we use a quadrature phase detector in the PLL to create a monitor signal which characterizes the transmitted signal performance in terms of optical-to-noise ratio (OSNR) and accumulated chromatic dispersion (ACD). This scheme is applied to a 112-Gbit/s none-return-to-zero (NRZ) differential quadrature phase shift keying (DQPSK) system. Experimental results show that the clock can be recovered in a dispersion range of −40 to 40 ps/nm, and the evaluated OSNR, over a range of 18~36 dB, has a deviation smaller than 1 dB compared to the measured one based on the optical spectrum method. The bit error ratio remains below 10−9 for 12 hours in the back-to-back case and 2 hours after transmission over 100-km standard single mode fiber (SSMF).

© 2011 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(060.5060) Fiber optics and optical communications : Phase modulation

ToC Category:
Access Networks and LAN

Original Manuscript: October 3, 2011
Revised Manuscript: November 24, 2011
Manuscript Accepted: November 25, 2011
Published: December 5, 2011

Virtual Issues
European Conference on Optical Communication 2011 (2011) Optics Express

He Wen, Lin Cheng, Jinxin Liao, Xiaoping Zheng, Hanyi Zhang, Yili Guo, and Bingkun Zhou, "Simultaneous clock recovery and dispersion, OSNR monitoring for 112-Gbit/s NRZ-DQPSK using frequency down-conversion electro-optical phase-locked loop," Opt. Express 19, B687-B701 (2011)

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