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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 20681–20690

Ultracompact all-optical XOR logic gate in a slow-light silicon photonic crystal waveguide

C. Husko, T. D. Vo, B. Corcoran, J. Li, T. F. Krauss, and B. J. Eggleton  »View Author Affiliations

Optics Express, Vol. 19, Issue 21, pp. 20681-20690 (2011)

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We demonstrate an ultracompact, chip-based, all-optical exclusive-OR (XOR) logic gate via slow-light enhanced four-wave mixing (FWM) in a silicon photonic crystal waveguide (PhCWG). We achieve error-free operation (<10−9) for 40 Gbit/s differential phase-shift keying (DPSK) signals with a 2.8 dB power penalty. Slowing the light to vg = c/32 enables a FWM conversion efficiency, η, of −30 dB for a 396 μm device. The nonlinear FWM process is enhanced by 20 dB compared to a relatively fast mode of vg = c/5. The XOR operation requires ≈ 41 mW, corresponding to a switching energy of 1 pJ/bit. We compare the slow-light PhCWG device performance with experimentally demonstrated XOR DPSK logic gates in other platforms and discuss scaling the device operation to higher bit-rates. The ultracompact structure suggests the potential for device integration.

© 2011 OSA

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(130.3750) Integrated optics : Optical logic devices
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Integrated Optics

Original Manuscript: August 16, 2011
Revised Manuscript: September 23, 2011
Manuscript Accepted: September 26, 2011
Published: October 4, 2011

C. Husko, T. D. Vo, B. Corcoran, J. Li, T. F. Krauss, and B. J. Eggleton, "Ultracompact all-optical XOR logic gate in a slow-light silicon photonic crystal waveguide," Opt. Express 19, 20681-20690 (2011)

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