Photonic generation of microwave signals using a dual-transmission-band FBG filter with controllable wavelength spacing
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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.
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- 7.A. Yariv, Optical Electronics in Moidern Communications, 5th edn. (Oxford University Press, New York, Oxford, 1997), p. 634Google Scholar