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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 28 — Oct. 1, 2010
  • pp: 5199–5204

Theoretical modeling of an improved all-optical flip flop based on a nonlinear semiconductor distributed feedback laser structure

Hossam Zoweil  »View Author Affiliations


Applied Optics, Vol. 49, Issue 28, pp. 5199-5204 (2010)
http://dx.doi.org/10.1364/AO.49.005199


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Abstract

A new, improved design of an all-optical flip flop is proposed. The waveguiding layer of the device consists of a phase-shifted nonlinear grating. The grating layers of a high refractive index have a negative nonlinear coefficient. A phase-shift section exists at the middle of the waveguiding layer. The optical gain is provided by current injection into an active layer. Nonlinearity in the waveguiding layer is achieved by direct absorption at the edge of the absorption band (Urbach tail). In the “OFF” state, the waveguiding layer forms a weak grating with an optical feedback below the laser threshold. In the “ON” state, the device functions as a distributed feedback (DFB) laser due to an induced strong grating in the nonlinear waveguiding layer. The improvements of the device performance by reducing the set pulse energy and accelerating the switch-off process are discussed. Field simulations in the time domain were performed.

© 2010 Optical Society of America

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(130.3750) Integrated optics : Optical logic devices
(130.4310) Integrated optics : Nonlinear
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(130.4815) Integrated optics : Optical switching devices

ToC Category:
Integrated Optics

History
Original Manuscript: May 18, 2010
Revised Manuscript: August 21, 2010
Manuscript Accepted: August 25, 2010
Published: September 21, 2010

Citation
Hossam Zoweil, "Theoretical modeling of an improved all-optical flip flop based on a nonlinear semiconductor distributed feedback laser structure," Appl. Opt. 49, 5199-5204 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-28-5199

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