All optical Flip-Flop based on a nonlinear DFB semiconductor laser: Theoretical study

OPTICS COMMUNICATIONS

卷:283

Article

Zoweil, Hossam¹  Kashyout, A. B.¹ 

[1] Mubarak City Sci Res & Technol Applicat, Adv Technol & New Mat Res Inst, New Borg El Arab City, Alexandria, Egypt

关键词: All optical switching;    Flip-Flop;    DFB semiconductor laser;    Nonlinear refractive index;   

DOI  :  10.1016/j.optcom.2009.10.031

来源: Elsevier

【 摘 要 】

A new design of an all optical Flip-Flop is proposed. It consists of a nonlinear distributed feedback (DFB) laser. The wave guiding layer of the DFB laser consists of linear grating section followed by a nonlinear one. and both sections are separated by a phase shift section. In the OFF-state, the real part of the refractive index in the wave guiding layer forms a Bragg grating. In the ON-state, it forms a Bragg grating with a phase shift section. Optical gain is achieved by current injection in the semiconductor active layer. Nonlinearity in the nonlinear layers of the semiconductor grating was achieved by direct absorption at the edge of the absorption band (Urbach tail). Numerical simulation shows that the device switches in a nanosecond time scale. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

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