Stabilization and Noise Reduction of DFB Laser by Incoherent Optical Feedback using FP-Resonator

使用 FP 谐振器通过非相干光反馈稳定 DFB 激光器并降低噪声

基本信息

批准号：
02650238
负责人：
IDA Yoshio
金额：
$ 1.41万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

For the purpose of coherent optical communication system, semiconductor lasers should be frequency stabilized and its spectral linewidth should be narrowed. In our research plan, this is intended to achieve by loading a FP resonator having a high finess and by controlling its wavelength at a portion on the positve slope of the reflection curve of the FP resonator. This method has an advantage that amount of negative feedback is determined only by changing the refractive index of the active layer due to the carrier effect. So the system is free from the roll-off attributable to the parasitic capacitance and inductance.However, it has been found that the above scheme has the following drawbacks ; a) there exists a tradeoff between a high sensitivity of FP resonator and the corresponding bandwidth narrowing, b) there exists a considerable amount of light reflection from the input facit of FP resonator, and c) there exists a residual coherent light feedback due to the even order light reflections from FP resonator. In addition to these, it has been experimentally confirmed that employment of a FP resonator having a high finess does not exhibit a remarkable advantage as compared with other interferometer such as Michelson's.On the other hand, it has been reported that a number of studies are taking advantage of the effects of TM light injection in determining the dynamic parameters of semiconductor lasers, wavelength conversion scheme, picosecond pulse generation and polarization bistability. In relation to these circumstances, we turned our research issue to the fundamental properties of TM light injection. As results of that we have achieved a new method for experimental determination of gain compression factors in the presence of TM light infection, and analytical study of polarization bistability of DFB laser, which were accepted for publication in IEEE Photonics Technology Letters, and IEEE J. of Lightwave Technology, respectively.

为了实现相干光通信系统，需要对半导体激光器进行稳频并窄化其谱线宽度。在我们的研究计划中，这旨在通过加载具有高精细度的FP谐振器并通过将其波长控制在FP谐振器的反射曲线的正斜率的部分来实现。该方法的优点是仅通过由于载流子效应而改变有源层的折射率来确定负反馈量。因此，该系统不会出现由于寄生电容和电感而导致的滚降。但是，已经发现上述方案具有以下缺点； a) FP 谐振器的高灵敏度和相应的带宽变窄之间存在权衡，b) FP 谐振器的输入端存在大量的光反射，c) 由于FP 谐振器的均匀光反射。除此之外，已经通过实验证实，与诸如迈克尔逊干涉仪之类的其他干涉仪相比，采用具有高精细度的FP谐振器并没有表现出显着的优势。利用TM光注入的效应来确定半导体激光器的动态参数、波长转换方案、皮秒脉冲生成和偏振双稳定性。针对这些情况，我们将研究问题转向TM光注入的基本特性。结果，我们实现了一种在 TM 光感染存在下实验确定增益压缩因子的新方法，并对 DFB 激光器的偏振双稳性进行分析研究，该方法已被 IEEE Photonics Technology Letters 和 IEEE J.分别是光波技术公司。