Photonic generation of microwave signals using a dual-transmission-band FBG filter with controllable wavelength spacing |
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| Authors: | L. Xia P. Shum T.H. Cheng |
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| Affiliation: | (1) School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore |
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| Abstract: | Two π-phase shifts are introduced in a uniform fiber Bragg grating (FBG) structure and a dual-transmission-band opens in the stopband of FBG. When incorporating this kind of FBG filter in a fiber ring cavity with a semiconductor optical amplifier (SOA) acted as gain medium, a stable dual-wavelength lasing with wavelength spacing of 0.032, 0.052 and 0.068 nm is achieved, respectively. Therefore, the laser output is heterodyned on a photodetector and desired microwave frequencies of 3.15, 6.16 and 8.08 GHz are generated. PACS 41.20.-q; 42.55.Wd; 42.81.-i |
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