All-fiber flat-top interleaver based on double single mode couplers

LU Huai-wei; ZHANG Bao-ge; LI Min-zhi; LUO Guan-wei

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All-fiber flat-top interleaver based on double single mode couplers

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- All-fiber flat-top interleaver based on double single mode couplers
- Optics and Precision Engineering Vol. 14, Issue 2, Pages: 145-150(2006)
- 作者机构：
  
  1. 兰州交通大学光电技术与智能控制教育部重点实验室,甘肃兰州 730070
  2. 兰州交通大学数理与软件工程学院,甘肃兰州 730070
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN253;TN929.11
- Received：14 October 2005，
  
  Revised：04 January 2006，
  
  Published Online：30 April 2006，
  
  Published：30 April 2006
- 稿件说明：
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LU Huai-wei, ZHANG Bao-ge, LI Min-zhi, et al. All-fiber flat-top interleaver based on double single mode couplers[J]. Optics and precision engineering, 2006, 14(2): 145-150.
DOI：

LU Huai-wei, ZHANG Bao-ge, LI Min-zhi, et al. All-fiber flat-top interleaver based on double single mode couplers[J]. Optics and precision engineering, 2006, 14(2): 145-150. DOI：

摘要

提出了由一个3×3 单模光纤耦合器和一个2×2单模光纤耦合器级联组成的波长交错滤波器

给出了其基本结构形式。将3×3耦合器中的两边两个输出端口连接在一起

中间端口为反射回路

形成一个3阶级联反射式Mach-Zehnder干涉仪

利用傅里叶级数展开的方法对其输出特性进行了分析。分析结果表明:组成滤波器的两个耦合器分光比和干涉臂的臂长差取一些定值时

可得到输出波形通带平坦的波长交错滤波器

其输出稳定性和隔离度均得到了提高。与通常的3阶级联Mach-Zehnder干涉仪相比

耦合器数目减少

在实际制作时可以对耦合器的分光比和干涉臂臂长差进行准确监测和控制。

Abstract

The transmission function of a interleaver consisting of a 2×2 and 3×3 single mode fiber coupler in series was analyzed. Based on the Fourier series digital approximation method

the relationship among the splitting ratios of the couplers

the length difference of interference arms and intensity transmission spectrum was discussed. The results indicate that this configuration can achieve an approximate rectangular wavelength response when the length difference of interference arms and coupling coefficients of the couplers are given by a certain value in order

its stability and isolation is improved greatly. An advantage of this interleaver is that the coupling ratio of coupler and the proportion of the length differences can be controlled accurately because light interference effect can be sheered away in fabricating. A novel structure of interleaver is fabricated with fused biconical taper technics in experiment. The experiment results are in good agreement with the theoretical analysis.

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references

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