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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 20273–20281

Spectral efficiency limits of pre-filtered modulation formats

Yi Cai, Jin-Xing Cai, Alexei Pilipetskii, Georg Mohs, and Neal S. Bergano  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 20273-20281 (2010)

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We investigate the spectral efficiency (SE) limit of pre-filtered modulation in optical fiber communication systems. We show that pre-filtering induced symbol correlation generates a modulation with memory and, thus, a higher SE limit than that of the original memoryless modulation. The SE limits of a series of modulation formats with varying number L of correlated symbols producing 50% of the original bandwidth are evaluated, which approach the SE limit of a modulation format with 50% pre-filtering as L → ∞. We show that the SE limit of a modulation format with L correlated symbols approximates a lower bound for the SE limit of the corresponding pre-filtered format.

© 2010 OSA

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

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 28, 2010
Revised Manuscript: August 31, 2010
Manuscript Accepted: September 2, 2010
Published: September 8, 2010

Yi Cai, Jin-Xing Cai, Alexei Pilipetskii, Georg Mohs, and Neal S. Bergano, "Spectral efficiency limits of pre-filtered modulation formats," Opt. Express 18, 20273-20281 (2010)

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