Jiang Meng, Lin Bo, Shum Perry Ping, Tjin Swee Chuan, Dong Xinyong, Sun Qizhen
School of Electrical and Electronics Engineering, Nanyang Technological University, 637553, Singapore.
Appl Opt. 2011 May 1;50(13):1900-4. doi: 10.1364/AO.50.001900.
Frequency tunable microwave signal generation, based on a dual-wavelength single-longitudinal-mode (SLM) erbium-doped fiber (EDF) laser, incorporating a phase-shifted fiber Bragg grating (PS-FBG) with two π-phase shifts, is demonstrated. In the proposed configuration, the PS-FBG with two ultranarrow transmission bands is embedded in a triangular cantilever to serve as a wavelength spacing tunable filter with a fixed center wavelength by applying various strains on the cantilever. A section of unpumped EDF is employed as a saturable absorber to ensure SLM operation in each of the two lasing lines. By beating the two wavelengths at a photodiode, a tunable microwave signal ranging from 8.835 to 24.360 GHz is successfully achieved.
基于双波长单纵模掺铒光纤（EDF）激光器、结合具有两个π相移的相移光纤布拉格光栅（PS-FBG），实现了频率可调谐微波信号产生。在所提出的配置中，具有两个超窄传输带的PS-FBG被嵌入到三角形悬臂梁中，通过在悬臂梁上施加不同应变，用作中心波长固定的波长间隔可调谐滤波器。一段未泵浦的EDF用作饱和吸收体，以确保在两条激光线中的每一条中实现单纵模工作。通过在光电二极管处对两个波长进行拍频，成功实现了8.835至24.360 GHz范围内的可调谐微波信号。
