Asymmetric Apodization of Linear Chirped Fiber Grating based on Refractive Index Compensation

SUN Rui-xia; LI Wei; ZHAO Fa; WANG Zong-qian

doi:10.13756/j.gtxyj.2018.01.011

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Asymmetric Apodization of Linear Chirped Fiber Grating based on Refractive Index Compensation

- Asymmetric Apodization of Linear Chirped Fiber Grating based on Refractive Index Compensation
- Study on Optical communication Issue 1, Pages: 38-42(2018)
- 作者机构：
  
  安徽工程大学检测技术与节能装置省级实验室
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2018.01.011
  CLC： TN253
- Published：2018，
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[1]孙瑞霞,李炜,赵发,王宗乾.基于折射率补偿的线性啁啾光栅非对称变迹[J].光通信研究,2018(01):38-42.

SUN Rui-xia, LI Wei, ZHAO Fa, et al. Asymmetric Apodization of Linear Chirped Fiber Grating based on Refractive Index Compensation. [J]. (1):38-42(2018)
[1]孙瑞霞,李炜,赵发,王宗乾.基于折射率补偿的线性啁啾光栅非对称变迹[J].光通信研究,2018(01):38-42. DOI： 10.13756/j.gtxyj.2018.01.011.

SUN Rui-xia, LI Wei, ZHAO Fa, et al. Asymmetric Apodization of Linear Chirped Fiber Grating based on Refractive Index Compensation. [J]. (1):38-42(2018) DOI： 10.13756/j.gtxyj.2018.01.011.

摘要

针对线性啁啾光栅反射谱有震荡、两侧有旁瓣等问题

从耦合模理论出发

研究了调制深度Δn、光栅长度L和啁啾系数C等对其反射谱的影响

深入探讨了重要参数与特性的关系。提出了基于折射率补偿的非对称变迹优化方法

探寻了有效的变迹函数、补偿系数和最佳比例。结果表明

随着L（5

00mm）、Δn(10

-5

-3

)和C（0.01

.2nm/cm）的增大

峰值都向长波长方向漂移

3dB带宽都增大

分别为1.79、1.26和1.71nm

且基本成线性关系;L较小时

反射谱顶部有较大震荡;Δn较大时

反射谱两侧出现明显旁瓣。优化后时延线性区域增大

色散曲线更平稳

反射谱顶部较平坦

没有旁瓣

带宽没有减小

具有更好的光学特性。

Abstract

In order to solve the problems of oscillation on the top and side lobes of reflection spectrum for linear chirped grating

the influences of refractive index modulation depth

grating length

chirp coefficient on reflection spectrum are studied based on coupled mode theory

and the relationship between parameters and characteristics are deeply explored in this paper.A asymmetric apodized optimization method based on refractive index compensation is proposed.The effective apodization functions

compensation factor and optimal piecewise apodization ratio are also explored.Simulation results show that the peak shifts to the direction of longer wavelength

and the 3 dB bandwidths increase basically linear with L（5

00 mm）

Δn(10

-5

-3

)and C（0.01

.2 nm/cm）

which can achieve 1.79

1.26

1.71 nm

respectively.The peak value increases with LandΔn

and decreases with C.There is a big shock at the top when Lis small.WhenΔnis large

obvious side lobes appear on both sides of the central spectrum.After applying the optimization algorithm

the linear region has increased

and the dispersion curve has been more stable.Compared to the traditional algorithm

the top of reflection spectrum is much more flat with no side lobe and no bandwidth reduction.The proposed optimization algorithm shows the better optical characteristics.

关键词

啁啾光栅反射谱优化非对称补偿系数

Keywords

chirped gratingreflectance spectrumoptimizationasymmetriccompensation factor

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