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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: O. Gerstel and P. Iannone
  • Vol. 6, Iss. 4 — Apr. 1, 2014
  • pp: 355–361

Performance Comparison for NRZ, RZ, and CSRZ Modulation Formats in RS-DBS Nyquist WDM System

Shuchang Yao, Songnian Fu, Hantao Wang, Ming Tang, P. Shum, and Deming Liu  »View Author Affiliations


Journal of Optical Communications and Networking, Vol. 6, Issue 4, pp. 355-361 (2014)
http://dx.doi.org/10.1364/JOCN.6.000355


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Abstract

Non-return-to-zero (NRZ), carrier-suppressed return-to-zero (CSRZ), and 33% return-to-zero (RZ) are the three most commonly used modulation formats in the current fiber-optical communication system. In this paper, we investigate and comprehensively compare their performance using the recently proposed receiver side duobinary shaping Nyquist wavelength division multiplexing (RS-DBS Nyquist WDM) technique, which is believed to be one of the promising candidates in the next high-capacity, high-data-rate, long-distance optical transmission systems with its cost-effective capability. It is found that, in a scenario of 3×112Gbps polarization division multiplexing quadrature phase-shift keying (PDM-QPSK) RS-DBS Nyquist WDM transmission, for back-to-back (B2B) transmission, NRZ can obtain almost the same performance as CSRZ and 33% RZ at the optimum bandwidth of 0.82× symbol rate for optical filters at the transmitter side. However, under narrower bandwidth optical filtering, CSRZ and 33% RZ signals have advantages over NRZ signal for requiring 0.5 and 1 dB less optical signal-to-noise ratio at BER=1×103 with a 0.6× symbol rate bandwidth optical filter. Moreover, using the optimum optical filter, after a 1600 km single-mode fiber (SMF) transmission, the CSRZ and 33% RZ signals can achieve 0.55 and 0.7 dB Q factor improvements over NRZ signals, by taking fiber nonlinearity into account. The RZ format is more ideal for the RS-DBS Nyquist WDM system with long-haul SMF transmissions.

© 2014 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications
(060.4080) Fiber optics and optical communications : Modulation
(120.2440) Instrumentation, measurement, and metrology : Filters

ToC Category:
Research Papers

History
Original Manuscript: September 27, 2013
Revised Manuscript: January 16, 2014
Manuscript Accepted: January 30, 2014
Published: March 4, 2014

Citation
Shuchang Yao, Songnian Fu, Hantao Wang, Ming Tang, P. Shum, and Deming Liu, "Performance Comparison for NRZ, RZ, and CSRZ Modulation Formats in RS-DBS Nyquist WDM System," J. Opt. Commun. Netw. 6, 355-361 (2014)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jocn-6-4-355

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