Decoherence of fiber light sources using a single-trench fiber

doi:10.1088/1674-1056/abb65f

中国物理B ›› 2020, Vol. 29 ›› Issue (12): 124210-.doi: 10.1088/1674-1056/abb65f

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

收稿日期:2020-05-09 修回日期:2020-08-06 接受日期:2020-09-09 出版日期:2020-12-01 发布日期:2020-11-13

Decoherence of fiber light sources using a single-trench fiber

Huahui Zhang(张华辉)¹, Weili Zhang(张伟利)^1,†, Zhao Wang(王昭)¹, Hongyang Zhu(朱洪杨)¹, Chao Yu(余超)², Jiayu Guo(郭佳宇)¹, Shanshan Wang(王珊珊)¹, and Yunjiang Rao(饶云江)¹

¹ School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; ² China Second Institute of Railway Engineering Group Co. LTD, Chengdu 610031, China

Received:2020-05-09 Revised:2020-08-06 Accepted:2020-09-09 Online:2020-12-01 Published:2020-11-13
Contact: ^†Corresponding author. E-mail: wl_zhang@uestc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974071 and 61635005) and in part by Sichuan Science and Technology Program, China (Grant No. 2018HH0148).

摘要/Abstract

Abstract: Decoherence of fiber laser sources is of great importance in imaging applications, and most current studies use ordinary multi-mode fibers (MMFs). Here, a newly designed single-trench fiber (STF) is investigated to reduce the spatial coherence of fiber light source and compared with MMFs. By bending two fibers with different turns, speckle contrast of a 0.8-m-long STF can be reduced from 0.13 to 0.08, while a 0.8-m-long MMF shows an inverse result. Through speckle contrast and decoupling-mode analysis, the reason of this inverse trend is revealed. Firstly, the STF supports more modes than the MMF due to its larger core diameter. Secondly, mode leak from the first core of the STF can couple to the second core when bending the STF. Thus, power distribution among high and low-order modes become more even, reducing the spatial coherence considerably. However, in the MMF, high-order modes become leaky modes and decrease slightly when bending the fiber. This work provides a new method to modulate coherence of light source and a new angle to study decoherence principle using special fibers.

Key words: single-trench fiber, multi-mode fiber, bending fiber, speckle contrast

中图分类号: (Fiber optics)

42.81.-i

42.87.-d (Optical testing techniques)

. [J]. 中国物理B, 2020, 29(12): 124210-.

Huahui Zhang(张华辉), Weili Zhang(张伟利), Zhao Wang(王昭), Hongyang Zhu(朱洪杨), Chao Yu(余超), Jiayu Guo(郭佳宇), Shanshan Wang(王珊珊), and Yunjiang Rao(饶云江). Decoherence of fiber light sources using a single-trench fiber[J]. Chin. Phys. B, 2020, 29(12): 124210-.

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Decoherence of fiber light sources using a single-trench fiber

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