Linear-Cavity Fiber Laser in Nearly Single-Frequency
Operation using Faraday Rotator Mirror¹

S. K. Liaw^{a, b}, H. Wang^a, K. H. Hsu^a, S. C. Lin^a, N.-K. Chen^c,
C. S. Shin^b, and Y. Tver’yanovich^d

^a Department of Electronic Engineering, National Taiwan University of Science and Technology,
Taipei 106, Taiwan

^b Department of Mechanical Engineering, National Taiwan University,
Taipei 106, Taiwan

^c Department of Electro-Optical Engineering, National United University,
Miaoli 360, Taiwan

^d Department of Chemical Engineering, St. Petersburg State University,
St. Petersburg, Russia

e-mail: skliaw@mail.ntust.edu.tw

Received August 16, 2011; in final form, September 3, 2011; published online December 28, 2011

Abstract—A nearly single-frequency selection is realized in a linear-cavity fiber laser constructed using a Fara-
day rotator mirror (FRM) and a partial reflectance fiber Bragg grating (FBG) as the cavity ends. At 1552.46 nm
wavelength, the measured optical signal-to-noise-ratio (OSNR) is 58.5 dB with a linewidth less than 400MHz
obtained using a subring cavity and a polarization controller as the mode filters. The pumping efficiency is
improved by 10% by recycling the residual pump power to the gain medium.

DOI: 10.1134/S1054660X12020156

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