【作者】 冯震；

【导师】 盛新志； 吴重庆；

【作者基本信息】 北京交通大学 ， 光学工程， 2008， 硕士

【摘要】 全光触发器是具有记忆功能的光逻辑器件,它们的组合可以实现时钟恢复、再生、帧头分离、帧头识别等高速全光信号处理的各种功能,在未来的全光交换网中起着重要的作用。目前,全光触发器的研制仍然处于起步阶段,许多技术被考虑用于全光触发功能的实现。本文提出了一种在法布里-珀罗激光器中基于注入锁定特性和光学双稳性的全光触发器实现方案,并进行了相应的实验研究。对注入锁定、自注入锁定、光学双稳性分别进行了实验研究。搭建的全光触发器系统,包含一个激光器和由两个布拉格光纤光栅和一个掺铒光纤放大器构造的外腔。系统基于光学双稳性的原理实现触发器输出状态的稳定,关键是布拉格光纤光栅对激光器的输出进行有选择的反馈后,通过掺铒光纤放大器的光强调整满足光学双稳性要求。全光触发器的“开-关”状态由注入的不同波长的触发光决定。实验表明,在1537nm的波长位置,实现了触发翻转功能,两个触发状态的消光比为15dB。该全光触发器的结构简洁,易于集成。这是首次通过搭建法布里-珀罗激光器外腔实现的全光触发器功能,提出的模型对于以后全光触发器的研究有重要的指导意义和参考价值。更多还原

【Abstract】 All-optical flip-flop (OFF) is an optical logic device with memory function and can be assembled to provide such functions as clock recovery, clock regeneration, header extraction, header recognition and optical buffering utilized in high all-optical signal processing systems. It will play an important role in the All-optical-net. The current research on all-optical flip-flops is still in its early stage now and lots of technologies have been considered as a candidate of all-optical flip-flop.In this paper, a novel scheme is proposed and experimentally demonstrated for all-optical flip-flop based on the optical bistability of an injection locked Fabry-Perot laser diode (FP-LD). Firstly, the experimental studies are respectively demonstrated on injection locked laser, self-seeding, optical bistability. And then an all-optical flip-flop is assembled with one FP-LD and two Fiber-Bragg-Gratings (FBG) external cavity. The All-optical flip-flop operation can be realized using optical bistablility to maintain the output state of OFF. The essential part to obtain bistability in this system is that lasing light output of FP-LD is fed back partly by two FBGs at certain wavelengths. The EDFA was used to adjust the power of feedback light. The on or off state of the All-optical flip-flop is determined by the set or reset light externally at different wavelength. The all-optical flip-flop operated at the wavelength of 1537nm with a on-off contrast ratio of 15 dB.The advantage of the all-optical flip-flop is its simple structure and can be integrated easily.To our knowledge, it is the first time to experimentally demonstrated all-optical flip-flop operation using a fiber grating external cavity, and the model has important guidance meaning and reference value to the future research of All-optical flip-flop.更多还原