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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 9 — Apr. 23, 2012
  • pp: 10339–10352

Towards full band colorless reception with coherent balanced receivers

Bo Zhang, Christian Malouin, and Theodore J. Schmidt  »View Author Affiliations

Optics Express, Vol. 20, Issue 9, pp. 10339-10352 (2012)

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In addition to linear compensation of fiber channel impairments, coherent receivers also provide colorless selection of any desired data channel within multitude of incident wavelengths, without the need of a channel selecting filter. In this paper, we investigate the design requirements for colorless reception using a coherent balanced receiver, considering both the optical front end (OFE) and the transimpedance amplifier (TIA). We develop analytical models to predict the system performance as a function of receiver design parameters and show good agreement against numerical simulations. At low input signal power, an optimum local oscillator (LO) power is shown to exist where the thermal noise is balanced with the residual LO-RIN beat noise. At high input signal power, we show the dominant noise effect is the residual self-beat noise from the out of band (OOB) channels, which scales not only with the number of OOB channels and the common mode rejection ratio (CMRR) of the OFE, but also depends on the link residual chromatic dispersion (CD) and the orientation of the polarization tributaries relative to the receiver. This residual self-beat noise from OOB channels sets the lower bound for the LO power. We also investigate the limitations imposed by overload in the TIA, showing analytically that the DC current scales only with the number of OOB channels, while the differential AC current scales only with the link residual CD, which induces high peak-to-average power ratio (PAPR). Both DC and AC currents at the input to the TIA set the upper bounds for the LO power. Considering both the OFE noise limit and the TIA overload limit, we show that the receiver operating range is notably narrowed for dispersion unmanaged links, as compared to dispersion managed links.

© 2012 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2380) Fiber optics and optical communications : Fiber optics sources and detectors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 14, 2012
Revised Manuscript: April 8, 2012
Manuscript Accepted: April 12, 2012
Published: April 19, 2012

Bo Zhang, Christian Malouin, and Theodore J. Schmidt, "Towards full band colorless reception with coherent balanced receivers," Opt. Express 20, 10339-10352 (2012)

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