首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Propagating beam analysis of fiber wavelength filters with a depressed-index section
Authors:Junji Yamauchi  Takashi Ando  Yasuhiro Akimoto  Hisamatsu Nakano
Institution:  a College of Engineering Hosei University, Tokyo, Japan
Abstract:A wavelength filter consisting of single-mode and few-mode fibers is investigated numerically. A simple finite-difference beam-propagation method, in which a transparent boundary condition can be imposed, is developed for circularly symmetric waveguides. After confirming the validity of the numerical method by the mode-mismatch loss, we calculate the propagating field in the fiber wavelength filter, in which interference between LP01, and LP02 modes occurs. To improve the filtering operation, a depressed-index fiber is employed for the few-mode fiber. The effects of the radius and refractive index of the depressed section on the transmission power are revealed and discussed. Power is suppressed to less than 0.1% at 1.3 μm, while maintaining power transmission of more than 85% at 1.55 μm. It is also found that the filtering operation shifts to higher wavelengths as the input power is increased when we choose a self-focusing nonlinear material in the depressed section.
Keywords:circularly symmetric geometry  depressed-index section  fiber wavelength filter  finite-difference beam-propagation method
本文献已被 InformaWorld 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号