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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 7374–7387

Multi-level signaling in the Stokes space and its application to large-capacity optical communications

Kazuro Kikuchi and Shojiro Kawakami  »View Author Affiliations

Optics Express, Vol. 22, Issue 7, pp. 7374-7387 (2014)

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The Stokes vector of an optical signal does not depend on its absolute phase; therefore, we can construct the phase-insensitive optical communication system, using the Stokes vector as a modulation parameter. In such a system, multi-level optical signals can effectively be designed in the three-dimensional Stokes space and demodulated either by direct detection or by coherent detection, where low-complexity digital-signal processing (DSP) is employed. Although this system has the disadvantage that adaptive equalizers can hardly be implemented in the digital domain, it is still an attractive solution to large-capacity (≥ 100 Gbit/s) and medium-or short-reach (≤ 100 km) transmission. In this paper, we discuss the receiver configuration for the multi-level signal in the Stokes space and the efficient DSP algorithm for demodulating such a signal. Simulation results demonstrate that 2-, 4-, 8-, 16-, and 32-ary signals in the Stokes space have good bit-error rate (BER) characteristics. Especially, the 16-ary signal at the moderate symbol rate of 25 Gsymbol/s can reach the bit rate of 100 Gbit/s even by using direct detection.

© 2014 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
(060.4080) Fiber optics and optical communications : Modulation

ToC Category:
Optical Communications

Original Manuscript: November 22, 2013
Revised Manuscript: January 24, 2014
Manuscript Accepted: March 4, 2014
Published: March 24, 2014

Kazuro Kikuchi and Shojiro Kawakami, "Multi-level signaling in the Stokes space and its application to large-capacity optical communications," Opt. Express 22, 7374-7387 (2014)

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