Chinese Optics Letters, 2008, 6 (11): 845, Published Online: Nov. 17, 2008   

Narrow-linewidth single-polarization frequency-modulated Er-doped fiber ring laser Download: 575次

Author Affiliations
School of Instrument Science and Opto-Electronics Engineering, Beihang University, Beijing 100083
Abstract
We demonstrate a 1550-nm narrow-linewidth fiber ring laser with stable single polarization by using single-mode Er-doped fiber as active fiber and saturable absorber. A polarization-maintaining circulator is used to acquire single-polarization laser light with the degree of polarization of 99.8%—99.9%. The linewidth measured using a delayed self-heterodyne method is less than 0.5 kHz. Frequency of the fiber laser can be modulated by driving the waveguide phase modulator with proper voltage. A Mach-Zehnder interferometer with the optical path difference between two arms of about 36 km is used to study the long-distance coherent detection of the fiber laser for frequency-modulated continuous-wave application.
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Pan Ou, Yudong Jia, Bin Cao, Chunxi Zhang, Shuling Hu, Di Feng. Narrow-linewidth single-polarization frequency-modulated Er-doped fiber ring laser[J]. Chinese Optics Letters, 2008, 6(11): 845.

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