Theoretical analysis of feedback high birefringence fiber loop mirror for application in single-frequency fiber lasers |
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Authors: | Guoyong Sun Dae Seung Moon |
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Affiliation: | a Department of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-gu, Gwangju 500-712, Republic of Korea b Department of Physics, Shantou University, Shantou, Guangdong 515063, People’s Republic of China c Samsung Electronics Hainan Fiber Optics - Korea Co. Ltd., #94-1, Imsoo-Dong, Gumi-City, Gyeong-Buk 730-350, Republic of Korea |
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Abstract: | A feedback high birefringence fiber loop mirror with a piece of erbium-doped fiber and a polarization controller is newly proposed. When the erbium-doped fiber is properly pumped to offset the loss of the feedback ring in the loop mirror, narrowband transmission peaks with large effective free spectral range can be achieved by the intrinsic vernier effect between orthogonally polarized lights respectively traveling along the two primary axes of the high birefringence fiber. In addition, the side transmission suppression ratio can reach about 6 dB. These special properties are independent of the polarization state of the input signal, which makes it feasible for the proposed feedback high birefringence fiber loop mirror to be employed as a narrowband filter in single-frequency fiber lasers. |
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Keywords: | Single-frequency fiber laser High birefringence fiber Vernier effect Free spectral range |
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