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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 5 — Feb. 27, 2012
  • pp: 5270–5280

A simple delay-line 4-PPM demodulator with near-optimum performance

M. L. Stevens and D. M. Boroson  »View Author Affiliations

Optics Express, Vol. 20, Issue 5, pp. 5270-5280 (2012)

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We describe a simple 4-PPM demodulator that uses analog delay lines and simple 1-bit comparators to determine the least-significant bit and most-significant bit of the 4-PPM encoded data without additional digital signal processing. We show that with good optical filtering the comparator-based demodulator can theoretically operate with sensitivity only 0.23 dB from the optimum 4-ary receiver. We describe as an example of this approach the demodulator built for the Lunar Laser Communication Demonstration and show measured performance within 1.1 dB of the expected sensitivity. The technique is extendable to higher-order, and higher-symbol-rate orthogonal modulation formats.

© 2012 OSA

OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(060.4510) Fiber optics and optical communications : Optical communications
(060.2605) Fiber optics and optical communications : Free-space optical communication

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: December 15, 2011
Revised Manuscript: February 3, 2012
Manuscript Accepted: February 7, 2012
Published: February 17, 2012

M. L. Stevens and D. M. Boroson, "A simple delay-line 4-PPM demodulator with near-optimum performance," Opt. Express 20, 5270-5280 (2012)

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