用于光聚焦及与硅脊形波导对接耦合的锥形透镜光纤的特性分析

Characteristic analysis of tapered lens fibers for light focusing and butt-coupling to a silicon rib waveguide.

作者信息

Yang Liu, Dai Daoxin, Yang Bo, Sheng Zhen, He Sailing

机构信息

Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang University, China.

出版信息

Appl Opt. 2009 Feb 1;48(4):672-8. doi: 10.1364/ao.48.000672.

DOI:10.1364/ao.48.000672

PMID:19183592

Abstract

The characteristics of tapered lens fibers (TLFs) are analyzed by using a finite-difference time-domain (FDTD) method. Two types of TLFs are considered, namely, a tapered-cladding TLF and a tapered-core TLF. The radial FDTD method is first used to simulate light focusing for these two types of TLFs. It is shown that the tapered-core TLF has a smaller focus spot size and a larger transmission loss than the tapered-cladding TLF. The butt-coupling between a TLF of either type and a Si rib waveguide is then simulated by a three-dimensional FDTD method. The tapered-core TLF has a smaller coupling loss to the Si rib waveguide but a similar total loss (the sum of the coupling loss and the transmission loss), as compared with the tapered-cladding TLF.

摘要

采用时域有限差分（FDTD）方法分析了锥形透镜光纤（TLF）的特性。考虑了两种类型的TLF，即锥形包层TLF和锥形纤芯TLF。首先使用径向FDTD方法对这两种类型的TLF进行光聚焦模拟。结果表明，与锥形包层TLF相比，锥形纤芯TLF具有更小的焦点光斑尺寸和更大的传输损耗。然后通过三维FDTD方法模拟了任意一种类型的TLF与硅肋波导之间的对接耦合。与锥形包层TLF相比，锥形纤芯TLF与硅肋波导的耦合损耗更小，但总损耗（耦合损耗与传输损耗之和）相近。