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Analyzing longitudinal‐mode of single‐frequency ring fiber laser
Author(s) -
Wang T. S.,
Guo Y. B.,
Wang K.
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22467
Subject(s) - longitudinal mode , optics , interferometry , laser linewidth , fiber bragg grating , fiber laser , materials science , laser , single mode optical fiber , fabry–pérot interferometer , physics
To realize single‐frequency of the fiber laser, a ring configuration is devised. The single‐frequency operation is realized at 1549.63 nm by using a fiber Bragg grating (FBG) as wavelength‐selective element and a unpumped 1.5 m‐long erbium‐doped fiber, which can produce standing‐wave saturation effects in the cavity. A measurement method based on fiber‐coupling scanning Fabry–Perot (F‐P) interferometer at 1.55 μm is designed. The laser longitudinal‐mode spacing is 11.1 MHz. The single‐frequency is observed by the interferometer with free spectrum range (FSR) of 7.5 GHz. The longitudinal‐mode fabric is analyzed by the interferometer with FSR of 1.5 GHz. As the cavity length increases, the longitudinal‐mode spacing changes to 3.7 MHz. The structures of longitudinal‐modes under different cavity lengths are compared. The longitudinal‐mode linewidth of 20 MHz is measured. Experimental results show that single‐frequency of the fiber laser can be approved accurately, and the effectiveness of the method, which can analyze longitudinal‐mode of the fiber laser with scanning Fabry–Perot (F‐P) interferometer, is improved. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1494–1497, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22467