Decoherence of fiber light sources using a single-trench fiber

doi:10.1088/1674-1056/abb65f

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.

Keywords: single-trench fiber multi-mode fiber bending fiber speckle contrast

Received: 09 May 2020
Revised: 06 August 2020
Accepted manuscript online: 09 September 2020

PACS:	42.81.-i	(Fiber optics)
	42.87.-d	(Optical testing techniques)

Fund: 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).

Corresponding Authors: ^†Corresponding author. E-mail: wl_zhang@uestc.edu.cn

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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 2020 Chin. Phys. B 29 124210

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