Polarization-maintaining nonlinear-amplifying-loop-mirror mode-locked fiber laser based on a 3 x 3 coupler

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We demonstrate a robust and low-noise all-polarization-maintaining (PM) nonlinear-amplifying-loop-mirror (NALM) mode-locked Er-fiber laser based on a 3 x 3 coupler. Since the 3 x 3 coupler generates 120-deg phase bias, the 3 x 3 PM-NALM laser can easily acquire mode-locked state even without any additional phase biasing components. In our experiment, the initiation of mode-locking required at least 1.5 times less pump power compared to the similar-structured 2 x 2 PM-NALM laser. The minimum relative-intensity noise (RIN) level reaches -155 dB/Hz with an integrated rms RIN of 0.0022% [10 Hz-1 MHz], which corresponds to one of the lowest integrated relative intensity noise (RIN) from any free-running mode-locked lasers. The laser also features very robust operation against mechanical vibrations. Stable mode-locked operation is maintained for more than 60 min even in continuous 1.5 grms vibrations. (c) 2019 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2019-03
Language
English
Article Type
Article
Citation

OPTICS LETTERS, v.44, no.5, pp.1068 - 1071

ISSN
0146-9592
DOI
10.1364/OL.44.001068
URI
http://hdl.handle.net/10203/253983
Appears in Collection
ME-Journal Papers(저널논문)
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