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首页> 外文期刊>Chinese science bulletin >Generation of ultrashort optical pulse by colliding-pulse mode locking in semiconductor laser diodes
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Generation of ultrashort optical pulse by colliding-pulse mode locking in semiconductor laser diodes

机译：半导体激光二极管中的碰撞脉冲锁模产生超短光脉冲

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摘要

The technique of mode locking has been improved and advanced cosiderably since its first demonstration in 1964. Picosecond, even femtosecond optical pulse is, in principle, capable of being generated easily by the technique. Ultrashort optical pulsesfrom semiconductor laser diodes play an essential role in the research of transient process of high-speed physics phenomenon and molecular relaxation. Interest in picosecond technique has recently been stimulated especially by the applications such as high bit rate time-division multiplexed communication, electrooptic sampling, and picosecond optical logic gate. A considerable amount of theoretical and experimental work has been done on the research. Mode-locking, Q-switching and gain switching are commonly used methods to generate short optical pulses, However, pulses with the narrowest duration and the highest repetition rate have been obtained by mode-locking technique, 1.4 ps pulse with 32.5 GHz repetition rate, reported by Chen et al. in 1990, hasbeen achieved using monolithic integrated colliding-pulse mode-locking (CPM) InGaAsP quantum well (QW) laser diodes (LD) modulated by ac source. We report in the note the generation of optical pulse of 5.0 ps, 32.5 GHz using three-segment CPM LD, without any ac modulation.
机译：自从1964年首次演示以来，锁模技术已经得到了相当大的改进和发展。原则上，皮秒甚至飞秒的光脉冲也很容易通过该技术产生。来自半导体激光二极管的超短光脉冲在高速物理现象和分子弛豫的瞬态过程研究中起着至关重要的作用。近年来，特别是通过诸如高比特率时分多路复用通信，电光采样和皮秒光学逻辑门之类的应用，激发了对皮秒技术的兴趣。在这项研究上已经进行了大量的理论和实验工作。锁模，调Q和增益切换是产生短光脉冲的常用方法，但是，通过锁模技术获得了持续时间最短和重复率最高的脉冲，重复率为32.5 GHz的脉冲为1.4 ps，由Chen等报道。在1990年，已经实现了使用由交流电源调制的单片集成碰撞脉冲锁模（CPM）InGaAsP量子阱（QW）激光二极管（LD）。我们在报告中报告说，使用三段CPM LD无需任何交流调制即可产生5.0 ps，32.5 GHz的光脉冲。

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