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Study of four-wave mixing in semiconductor optical amplifiers

半导体光放大器四波混频研究

基本信息

批准号：
11694125
负责人：
KAWAGUCHI Hitoshi
金额：
$ 7.04万
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：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

This study was started as the International Scientific Research: Joint Research and shifted to the Grant-in Aid for Scientific Research (B) because of the category change. Professor G; Guekos's research group of ETH and Professor H. Kawaguchi's research group of Yamagata University carried out this joint research with closed relation including mutual exchange young researchers.We have investigated mainly the following four topics to create new optical nonlinear functions based on four-wave mixing in semiconductor optical amplifiers (SOAs).(1) SOAs with multiple quantum well active layers corresponding to different band gaps are suitable for amplification of short optical pulses because of their wide gain spectrum. Uniformity of gain saturation in wide spectrum and ultra fast gain dynamics are important issues which should be investigated. We have measured the gain dynamics of such SOA by using the pump-probe method. The gain bandwidth is 100 nm. We found that the wavelength dependence … More of gain saturation characteristics is low. The saturation tendency is the same as SOAs with bulk active layers in which the larger saturation output is obtained at longer wavelength.(2) We analyzed numerically all-optical demultiplexing characteristics based on four-wave mixing (FWM) in SOAs by the finite-difference beam propagation method. We have obtained an optimum input pump pulsewidth. We have also analyzed all-optical demultiplexing characteristics for multichannel probe signals.(3) We precisely measured the deformation in the waveforms of optical pulses which propagated in a SOA using the cross-correlation technique. We found that the output pulse became asymmetric such that its leading edge was sharp compared with the trailing edge. The experimental results well agreed with the simulations by the beam propagation method.(4) We generated short optical pulses from a hybrid modelocked laser diode. The optical pulses were compressed to 450 fs pulse width (auto-correlation width) using an optical fiber with zero dispersion at 1.3 μm. Less

本研究开始时为国际科学研究：联合研究，由于类别变更，转为科学研究补助金（B）。G教授、Guekos的ETH研究小组和H.山形大学的川口研究小组与年轻的研究人员进行了密切的交流，共同开展了这项研究。我们主要研究了以下四个课题，以创建基于半导体光放大器（SOA）中四波混频的新的光学非线性函数。(1)具有多个量子阱有源层的SOA具有宽的增益谱，适合于短光脉冲的放大。宽频谱增益饱和均匀性和超快增益动态特性是需要研究的重要问题。我们用泵浦-探测方法测量了这种半导体光放大器的增益动态特性。增益带宽为100 nm。我们发现波长依赖性 ...更多信息增益饱和特性低。其饱和趋势与具有体有源层的SOA相同，其中在较长波长处获得较大的饱和输出。(2)采用有限差分光束传播法对SOA中基于四波混频的全光解复用特性进行了数值分析。得到了最佳的输入泵浦脉宽。分析了多路探测信号的全光解复用特性。(3)利用互相关技术精确测量了光脉冲在半导体光放大器（SOA）中传输时波形的畸变。我们发现，输出脉冲变得不对称，使其前沿是尖锐的相比，后缘。实验结果与光束传播法的模拟结果吻合较好。(4)我们从一个混合锁模激光二极管产生短光脉冲。利用1.3 μm零色散光纤将光脉冲压缩到450 fs脉冲宽度（自相关宽度）。少