All optical Flip-Flop based on a nonlinear DFB semiconductor laser: Theoretical study
| Autor: | Hossam Zoweil, A.B. Kashyout |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Distributed feedback laser
Materials science Holographic grating business.industry Physics::Optics Grating Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Semiconductor laser theory Optics Fiber Bragg grating law Blazed grating Electrical and Electronic Engineering Physical and Theoretical Chemistry business Diffraction grating |
| Zdroj: | Optics Communications. 283:474-479 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2009.10.031 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect