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A Study on the Optical Bistable Characteristic of a Multi-Section DFB-LD  

Kim, Geun-Cheol (Dept. of Electronic Communication Engineering Kwangwoon University)
Jeong, Yeong-Cheol (Dept. of Electronic Communication Engineering Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.39, no.8, 2002 , pp. 1-11 More about this Journal
Abstract
A multi-section DFB-LD shows optical bistability subject to externally injected light signal, then it has potential applications such as wavelength conversion and optical logic gates. In this paper, we have studied the optical bistability in multi-section DFB-LD using split-step time-domain model. It is confirmed that the multi-section DFB-LD, which is excited inhomogeneously, shows bistability. The optical bistable characteristics are investigated when input light is injected into a absorptive region. Simulation results show that multi-section DFB-LD works as a flip-flop depending on the set-reset optical pulse which has a few ns in switching time and a few pj in switching energy, so that it can act as a optical logic device. Besides, if we change the carrier lifetime and the differential gain coefficient, it is expected that the response time of optical output signal can be reduced.
Keywords
Optical bistability; DFB-LD; saturable absorber; bistable laser diode; flip-flop; split-step time-domain modeling;
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