Laser mode locking using a single-mode-fiber coil with enhanced polarization-dependent loss

A laser mode-locking phenomenon based on polarization-dependent loss (PDL) using a passive fiber coil is demonstrated. We propose using a fiber coil operating in low-V-number regime to achieve an enhanced bend-induced PDL and to maintain a reasonable bend loss. A mode-locked thulium doped all-fiber...

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Bibliographic Details
Published in:Optics letters 2020-05, Vol.45 (10), p.2866-2869
Main Authors: Jiang, Hongbo, Huang, Yunpeng, Zhao, Zihao, Shirahata, Takuma, Jin, Lei, Yamashita, Shinji, Set, Sze Y
Format: Article
Language:English
Subjects:
Coils
Fiber lasers
Laser applications
Laser mode locking
Laser modes
Lasers
Polarization
Thulium
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Summary:A laser mode-locking phenomenon based on polarization-dependent loss (PDL) using a passive fiber coil is demonstrated. We propose using a fiber coil operating in low-V-number regime to achieve an enhanced bend-induced PDL and to maintain a reasonable bend loss. A mode-locked thulium doped all-fiber laser is shown using the low-V-number fiber coil. The results indicate that a moderate amount of PDL at 1 dB is sufficient to initiate and sustain a stable CW mode-locking operation. To the best of our knowledge, this is the first demonstration of a CW mode-locked fiber laser based on PDL enabled by a fiber coil.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.393093