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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 5611–5619

Clock recovering characteristics of adaptive finite-impulse-response filters in digital coherent optical receivers

Kazuro Kikuchi  »View Author Affiliations

Optics Express, Vol. 19, Issue 6, pp. 5611-5619 (2011)

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We analyze the clock-recovery process based on adaptive finite-impulse-response (FIR) filtering in digital coherent optical receivers. When the clock frequency is synchronized between the transmitter and the receiver, only five taps in half-symbol-spaced FIR filters can adjust the sampling phase of analog-to-digital conversion optimally, enabling bit-error rate performance independent of the initial sampling phase. Even if the clock frequency is not synchronized between them, the clock-frequency misalignment can be adjusted within an appropriate block interval; thus, we can achieve an asynchronous clock mode of operation of digital coherent receivers with block processing of the symbol sequence.

© 2011 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2920) Fiber optics and optical communications : Homodyning

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 28, 2011
Revised Manuscript: February 26, 2011
Manuscript Accepted: March 1, 2011
Published: March 10, 2011

Kazuro Kikuchi, "Clock recovering characteristics of adaptive finite-impulse-response filters in digital coherent optical receivers," Opt. Express 19, 5611-5619 (2011)

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