Abstract
A new all-optical flip-flop based on a nonlinear Distributed feedback (DFB) structure is proposed. The device does not require a holding beam. A nonlinear part of the grating is detuned from the remaining part of the grating and has negative nonlinear coefficient. Optical gain is provided by an injected electrical current into an active layer. In the OFF state, due to the detuned section, no laser light is generated in the device. An injected optical pulse reduces the detuning of the nonlinear section, and the optical feedback provided by the DFB structure generates a laser light in the structure that sustains the change in the detuned section. The device is switched “OFF” by detuning another section of the grating by a Reset pulse. The Reset pulse reduces the refractive index of that section by the generation of electron-hole pairs. The Reset pulse wavelength is adjusted such that the optical gain provided by the active layer at that wavelength is zero. The Reset pulse is prevented from reaching the nonlinear detuned section by introducing an optical absorber in the laser cavity to attenuate the pulse. The device is simulated in time domain using General Purpose Graphics Processing Unit (GPGPU) computing. Set-Reset operations are in nanosecond time scale.
Highlights
All-optical flip-flop is required for all optical routing and processing of optical data packets [1]
How to cite this paper: Zoweil, H. (2016) Simulations of a Novel All-Optical Flip-Flop Based on a Nonlinear Distributed feedback (DFB) Laser Cavity Using General Purpose Graphics Processing Unit (GPGPU) Computing
The The electron-hole pairs density of carriers injected into the active layer Ng is normalized to Ntr = 1023 m−3
Summary
All-optical flip-flop is required for all optical routing and processing of optical data packets [1]. At high light intensity in the structure, at wavelength λ = λ1 that corresponds to a photon energy just below the band-gap energy in Section “3”, the detuning is decreased due to negative nonlinear coefficient. In this case, the optical feedback in the structure increases and allows for an optical laser mode to build up. In [12], the device is switched “OFF” by XGM, but in this work, the device is switched “OFF” by detuning a section of the DFB structure, and the optical gain is not altered In this case, the switch “OFF” dynamics is controlled. The device design and “ON/OFF” switching dynamics were described
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
