Decoherence of fiber light sources using a single-trench fiber*

被引:3
作者
Zhang, Huahui [1 ]
Zhang, Weili [1 ]
Wang, Zhao [1 ]
Zhu, Hongyang [1 ]
Yu, Chao [2 ]
Guo, Jiayu [1 ]
Wang, Shanshan [1 ]
Rao, Yunjiang [1 ]
机构
[1] Univ Elect Sci & Technol China, Sch Informat & Commun Engn, Chengdu 611731, Peoples R China
[2] Railway Engn Grp Co LTD, China Inst 2, Chengdu 610031, Peoples R China
基金
中国国家自然科学基金;
关键词
single-trench fiber; multi-mode fiber; bending fiber; speckle contrast; OPTICAL COHERENCE TOMOGRAPHY; SPATIAL-COHERENCE; SPECKLE REDUCTION; LASER; CONTRAST;
D O I
10.1088/1674-1056/abb65f
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
引用
收藏
页数:5
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共 29 条
[1]  
[Anonymous], 2019, INVEST OPHTH VIS SCI, DOI DOI 10.7498/APS.68.20181578
[2]   Random laser illumination: an ideal source for biomedical polarization imaging? [J].
Carvalho, Mariana T. ;
Lotay, Amrit S. ;
Kenny, Fiona M. ;
Girkin, John M. ;
Gomes, Anderson S. L. .
MULTIMODAL BIOMEDICAL IMAGING XI, 2016, 9701
[3]   Speckle reduction in OCT using massively-parallel detection and frequency-domain ranging [J].
Desjardins, A. E. ;
Vakoc, B. J. ;
Tearney, G. J. ;
Bouma, B. E. .
OPTICS EXPRESS, 2006, 14 (11) :4736-4745
[4]  
Drexler W, 2008, BIOL MED PHYS BIOMED, P1, DOI 10.1007/978-3-540-77550-8
[5]  
Efimov A, 2014, OPT EXPRESS, V33
[6]   Coherence and speckle contrast at the output of a stationary multimode optical fiber [J].
Efimov, Anatoly .
OPTICS LETTERS, 2018, 43 (19) :4767-4770
[7]  
Fercher AF, 2003, REP PROG PHYS, V66, P239, DOI [10.1088/0034-4885/66/2/204, 10.2184/lsj.31.635]
[8]   Classification of benthic composition in a coral reef environment using spectral unmixing [J].
Goodman, James A. ;
Ustin, Susan L. .
JOURNAL OF APPLIED REMOTE SENSING, 2007, 1
[9]   Rough surfaces induced speckle effects on detection performance of pulsed laser radar [J].
Guo, GJ ;
Shao, Y .
ACTA PHYSICA SINICA, 2004, 53 (07) :2089-2093
[10]   A narrow-band speckle-free light source via random Raman lasing [J].
Hokr, Brett H. ;
Schmidt, Morgan S. ;
Bixler, Joel N. ;
Dyer, Phillip N. ;
Noojin, Gary D. ;
Redding, Brandon ;
Thomas, Robert J. ;
Rockwell, Benjamin A. ;
Cao, Hui ;
Yakovlev, Vladislav V. ;
Scully, Marlan O. .
JOURNAL OF MODERN OPTICS, 2016, 63 (01) :46-49