Elucidation of polarization maintaining mechanism and Establishment of suppressing techniques of polarization fluctuation in fibers

光纤保偏机理的阐明和偏振波动抑制技术的建立

基本信息

批准号：
08650042
负责人：
SASAKI Yutaka
金额：
$ 0.45万
依托单位：
Ibaraki Unibersity
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Recently, researches and developments of optical fiber systems, such as optical fiber transmission systems and optical fiber sensors, are progressed. Normal single mode fibers are often used in these optical fiber systems. In usual optical fiber transmission systems, optical devices in transmitters and receivers are necessary to be polarization-independent when normal single mode fibers are used. So the systems become complex. The limitation of bit-rate in transmission caused by polarization modal dispersion cannot be neglected as the bit-rate becomes higher. To realize simple and low-cost optical fiber transmission systems, it is effective to use polarization maintaining fibers. However, optical fiber transmission systems using polarization maintaining fibers have not been sufficiently investigated. In optical fiber gyros, the accuracy of the gyros can be improved using polarization maintaining fibers. In constructions of those optical fiber systems, thermally-diffused expanded core (TEC) techniques are often used to decrease losses and device integration. However, the mode fields cannot be easily expanded in TEC techniques application to conventional polarization maintaining fibers since the mode fields become elliptical.In this research, the basic WDM transmission system using polarized lightwave with polarization maintaining fiber was investigated. In the various part of this system, transmitted powers and polarization crosstalks were clarified. The bit error rate was also measured in the transmission of optical pulse patterns. The polarization maintaining fibers suitable for TEC techniques were designed. It was theoretically shown that the polarization is sufficiently maintained in several hundred meter fiber system and that large mode field expansion can be derived. Moreover, the mode field considering refractive index distribution caused by dopant diffusion in TEC technique application.

最近，正在进行光纤系统的研究和开发，例如光纤传输系统和光纤传感器。正常的单模式纤维通常用于这些光纤系统中。在通常的光纤传输系统中，在使用正常的单模式纤维时，有必要在发射器和接收器中的光学设备无关。因此系统变得复杂。由于比特率变得更高，因此无法忽略由极化模态分散引起的传输中比特率的限制。为了实现简单和低成本的光纤传输系统，使用维持纤维的极化是有效的。但是，使用极化纤维的光纤传输系统尚未得到充分研究。在光纤陀螺仪中，使用维持纤维的极化可以提高陀螺的精度。在这些光纤系统的构造中，热扩散的扩展核心（TEC）技术通常用于减少损耗和设备集成。但是，由于模式字段变为椭圆形，因此无法轻松地将TEC技术应用于传统的极化。在这项研究中，研究了使用极化光波和极化维持光纤的基本WDM传输系统。在该系统的各个部分中，阐明了传输的力量和极化串扰。位错误率也在光学脉冲图案的传输中测量。设计了适用于TEC技术的极化纤维。从理论上讲，极化足够维持在几百米纤维系统中，并且可以得出大模式场的扩展。此外，考虑由TEC技术应用中掺杂剂扩散引起的折射率分布的模式场。