光纤光源基本原理

光纤光源是通过掺杂光纤如掺铒光纤在泵浦光的激发下电子在能级间跃迁时发出的荧光实现的。其具有宽谱及低偏振态特性。在光纤陀螺应用领域,因其较大功率的宽谱输出光,及光通信水平的器件可靠性而受到重视。但由于荧光谱在不同波段的非均匀性,对实际的应用造成了不良影响。实现一定光功率下高稳定性的钟形宽谱是光纤光源的一个主要研究方向,同时其功耗要求也较苛刻。

一篇高精度光纤陀螺用掺铒荧光光纤光源文章,“高性能掺铒光纤荧光光源的稳定特性”发表在, Optical Fiber Technology, Volume 19, Issue 3, June 2013, Pages 264–268;由于采用了特殊结构,其平均波长的稳定性在100度温度变化范围内,达到了1.3ppm/°C。并从理论分析中获得支持。这将对高精度光纤陀螺的研究产生积极的促进作用。

文章链接:
http://dx.doi.org/10.1016/j.yofte.2013.02.006

主要内容如下:
• Stabilization of a superfluorescent fiber source with high Performance erbium doped fibers
高性能掺铒光纤荧光光源的稳定特性

• Hongdan Wan a, Desheng Zhang a, b, Xiaohan Sun a,
万洪丹 a, 张德生 a,b,孙小菡 a

• a National Engineering Research Center for Optical Sensing/Communications Integrated Networking, Lab of Photonics and Optical Communications, Dept. of Electronics Engineering, Southeast University, Nanjing 210096, China
东南大学电子科学与工程学院
• b DeYi Times (Tianjin) Science and Technology Co. Ltd., Tianjin 300384, China
德逸时代(天津)科技有限公司

Keywords
• Fiber source,光纤光源 ; • Erbium doped fiber,掺铒光纤; • Stability,稳定性

Abstract
A high stability superfluorescent fiber source with mean-wavelength stability of 1.3 ppm/°C over a temperature range of 100 °C is proposed based on spectral shaping combined with a thermal management unit. A thermal tunable filter combined with an unpumped filtering erbium-doped fiber is used as the single-pass backward filter. Theoretical model of the filtering fiber’s temperature dependent gain spectra is presented which decides the filter’s central-wavelength with minimum thermal sensitivity for a specific temperature change. Power efficiency and spectral bandwidth of the superfluorescent fiber source are optimized based on three different erbium-doped fibers at room temperature.

Highlights
► A broadband fiber source is spectrally stabilized to 1.3 ppm/°C over a 100 °C change.
► A thermal gain model is set up to predict its thermal insensitive wavelength.
► Thermal-management combined with backward spectral filtering is used.
► Three newly developed gain fibers are used to optimize the fiber source’s output.
► The source is useful for high precision fiber optic gyroscope sensor application.