光束腰斑对基于在线双锥马赫-曾德尔干涉仪滤波器的可调谐光纤激光器性能的影响。

Effect of beam waists on performance of the tunable fiber laser based on in-line two-taper Mach-Zehnder interferometer filter.

作者信息

Yin Guolu, Wang Xiaozhen, Bao Xiaoyi

机构信息

Fiber Optics Group, Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada.

出版信息

Appl Opt. 2011 Oct 10;50(29):5714-20. doi: 10.1364/AO.50.005714.

DOI:10.1364/AO.50.005714

PMID:22015366

Abstract

A tunable fiber ring laser based on an in-line two-taper Mach-Zehnder interferometer (MZI) filter was realized, and the effect of beam waists of the tapers on performance of the laser was investigated with different beam waists of 70 μm, 49 μm, and 33 μm. Experimental results show that the tunable laser with MZI length of 1 m and beam waist of 49 μm can cover 16.1 nm with tuning steps of 0.07-0.5 nm, a bandwidth of 10 pm, and a side mode suppression ratio (SMSR) of 40-50 dB. Tuning range is not only determined by the number of the cladding modes but is also affected by the filter loss. Tuning step is determined by the differences of the effective refractive indexes between the cladding modes and the core mode. SMSR is determined by the balance between the extinction ratio of the filter and the cavity loss of the laser due to MZI filter.

摘要

实现了一种基于在线双锥马赫-曾德尔干涉仪（MZI）滤波器的可调谐光纤环形激光器，并研究了锥腰光束尺寸分别为70μm、49μm和33μm时，锥腰光束尺寸对激光器性能的影响。实验结果表明，MZI长度为1m、锥腰光束尺寸为49μm的可调谐激光器调谐范围为16.1nm，调谐步长为0.07 - 0.5nm，带宽为10pm，边模抑制比（SMSR）为40 - 50dB。调谐范围不仅取决于包层模式的数量，还受滤波器损耗的影响。调谐步长由包层模式与纤芯模式之间有效折射率的差异决定。SMSR由滤波器的消光比与MZI滤波器导致的激光器腔损耗之间的平衡决定。