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Study of ultrafast all-optical flip-flop operation with vertical-cavity surface-emitting lasers

垂直腔面发射激光器超快全光触发器操作研究

基本信息

批准号：
08455029
负责人：
KAWAGUCHI Hitoshi
金额：
$ 4.8万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

We have investigated mainly the following four topics to create new nonlinear optical functional devices based on the pitchfork bifurcation bistable operation of vertical-cavity surface-emitting lasers (VCSEL).(1) We observed the pitchfork bifurcation polarization bistability and successfully demonstrated all-optical flip-flop operation in a VCSEL.Switching between the two polarization states was accomplished by injecting trigger optical input, We also achieved the ultrafast polarization bistable switching with a switching time of 7ps by using picosecond optical trigger pulses.(2) We numerically analyzed an all-optical flip-flop operation using a polarization bistable VCSEL.We used rate equations taking into account gain saturation in the VCSEL and detuning of the incident optical beam frequency from the cavity resonant frequency of the VCSEL.We have clarified the most suitable operation conditions for the ultrafast flip-flop operation. The all-optical flip-flop can be obtained up to 3 … More 00 Gbit/s.(3) The relative magnitude of self- and cross-saturation coefficients are crucial to determine the characteristics of polarization switching. In order to obtain the detailed properties of nonlinear gain, we studied numerically the nonlinear gain coefficient for the optical fields in parallel and orthogonal polarization. The numerical calculation confirmed that the relation between self-and cross-saturation coefficients satisfies the condition for polarization bistability.(4) We newly proposed a demultiplexing (DEMUX) device. When the input signal and the gate pulse are injected simultaneously into the polarization bistable laser diode (BLD) with TE polarization, the polarization of the BLD is set to TE polarization using its AND gate function. Then, laser oscillation in TE polarization continues until the reset pulse with TM polarization is injected. Thus, the optical demultiplexing with a signal-bit width conversion function is achieved in the TE polarization output signal. Our results show that the ultrafast all-optical demultiplexing from a 50 Gbit/s signal to a 5 Gbit/s RZ signal can be obtained. Less

我们主要研究了以下四个课题，以建立基于垂直腔面发射激光器（VCSEL）的音叉分叉非线性操作的新型非线性光学功能器件。(1)我们在VCSEL中观察到了音叉分叉偏振双稳现象，并成功地实现了全光触发器的工作，通过注入触发光实现了两种偏振态之间的切换，利用皮秒光触发脉冲实现了7 ps的超快偏振双稳切换。(2)本文对一种基于偏振互锁VCSEL的全光触发器进行了数值分析，利用速率方程，考虑了VCSEL的增益饱和和入射光束频率与VCSEL谐振腔频率的失谐，阐明了超快触发器的最佳工作条件。全光触发器可以获得高达3 ...更多信息 00 Gbit/s。(3)自饱和系数和交叉饱和系数的相对大小对于确定偏振开关的特性至关重要。为了得到非线性增益的详细性质，我们数值研究了平行光场和正交光场的非线性增益系数。数值计算证实了自饱和系数与交叉饱和系数之间的关系满足极化双稳条件。(4)我们新提出了一种解复用（DEMUX）设备。当输入信号和选通脉冲被同时注入到具有TE偏振的偏振半导体激光二极管（BLD）时，利用其与门功能将BLD的偏振设置为TE偏振。然后，TE偏振的激光振荡继续，直到注入具有TM偏振的复位脉冲。因此，在TE偏振输出信号中实现了具有信号比特宽度转换功能的光学解复用。结果表明，该方法可以实现从50 Gbit/s信号到5 Gbit/s RZ信号的超快全光解复用。少