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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 15, Iss. 9 — Apr. 30, 2007
  • pp: 5543–5549

Simultaneous optical digital half-subtraction and -addition using SOAs and a PPLN waveguide

John E. McGeehan, Saurabh Kumar, and Alan E. Willner  »View Author Affiliations


Optics Express, Vol. 15, Issue 9, pp. 5543-5549 (2007)
http://dx.doi.org/10.1364/OE.15.005543


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Abstract

We demonstrate an optical half-subtracter and half-adder module that performs simultaneous bit-wise subtraction and addition of two 5 Gbit/s RZ data streams. We generate Borrow (/X∙Y) and Difference/Sum (X⊕Y, or XOR) outputs using cross-gain modulation (XGM) in two parallel SOAs. Taking advantage of the gain saturation inherent to SOAs, we generate two signals, /X∙Y, and X∙/Y, and combine them using a passive optical coupler to generate the XOR Difference/Sum output. We use difference-frequency-generation-based λ-conversion in a PPLN waveguide to generate the Carry (X∙Y) output. The PPLN waveguide allows bit-synchronous wavelength shifting, is wide-bandwidth, and offers no intrinsic chirp. Our module uses three active elements to perform simultaneous half-subtraction and addition, and carries a maximum power penalty of 1.0 dB.

© 2007 Optical Society of America

OCIS Codes
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: January 26, 2007
Revised Manuscript: April 19, 2007
Manuscript Accepted: April 20, 2007
Published: April 23, 2007

Citation
John E. McGeehan, Saurabh Kumar, and Alan E. Willner, "Simultaneous optical digital half-subtraction and -addition using SOAs and a PPLN waveguide," Opt. Express 15, 5543-5549 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-9-5543


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