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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29613–29619

The reduction of the LO number for heterodyne coherent detection

Xinying Li, Jianjun Yu, Nan Chi, Ze Dong, Junwen Zhang, and Jianguo Yu  »View Author Affiliations


Optics Express, Vol. 20, Issue 28, pp. 29613-29619 (2012)
http://dx.doi.org/10.1364/OE.20.029613


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Abstract

Relative to homodyne coherent detection, heterodyne coherent detection has simple architecture because no 90° hybrid and only half number of photodiodes and analog-to-digital convertor (ADC) chips are required. We experimentally demonstrate that the architecture of heterodyne coherent receivers can be further simplified. When the frequency offset is one half of the channel frequency spacing, one local oscillator (LO) laser can be used for two neighboring wavelength-division-multiplexing (WDM) channels, and therefore the number of LO lasers can be reduced into half compared to homodyne detection. We experimentally demonstrate simplified heterodyne coherent detection of 4 × 196.8-Gb/s polarization-division-multiplexing carrier-suppressed return-to-zero quadrature-phase-shift-keying (PDM-CSRZ-QPSK) modulation after transmission over 1040-km single-mode fiber (SMF)-28 on a 50-GHz grid with bit-error ratio (BER) smaller than pre-forward-error-correction (pre-FEC) limit of 3.8 × 10−3. To our best knowledge, 196.8 Gb/s is the highest bit rate per channel for heterodyne coherent WDM transmission system. An arrayed waveguide grating (AWG) instead of wavelength selective switch (WSS) is used at the transmitter to spectrally shape and multiplex the WDM signal. We also experimentally demonstrate that heterodyne detection causes 3-dB optical signal-to-noise ratio (OSNR) penalty at the BER of 3.8 × 10−3 for a certain single channel compared to homodyne detection.

© 2012 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2840) Fiber optics and optical communications : Heterodyne

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: October 25, 2012
Revised Manuscript: December 3, 2012
Manuscript Accepted: December 4, 2012
Published: December 20, 2012

Citation
Xinying Li, Jianjun Yu, Nan Chi, Ze Dong, Junwen Zhang, and Jianguo Yu, "The reduction of the LO number for heterodyne coherent detection," Opt. Express 20, 29613-29619 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-28-29613


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References

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