MULTI-TAP PHOTONIC MICROWAVE FILTER BASED ON A SELF-INJECTION LOCKED REFLECTIVE SEMICONDUCTOR OPTICAL AMPLIFIER

摘要

PURPOSE: A multi-tap optical microwave filter is provided to reduce cost-bearing, to avoid electromagnetic interference, and to improve filter performance by implementing a self-locked RSOA(Reflective Semiconductor Optical Amplifier) by serially connecting an RSOA, being a low cost light source, and multiple FBG(Fiber Bragg Grating)s with different wavelengths, thereby increasing the number of taps from one light source. CONSTITUTION: An optical filter(100) is composed of an RSOA(110), an FBG(120), and a wavelength-dependent light dispersive medium(130). As for the broadband ASE(Amplified Spontaneous Emission) emitted from the RSOA, lights of certain wavelengths are reflected by the FBG and reinserted into the RSOA. There are N numbers of FBGs, and the light dispersive medium causes fixed optical time delays between N-tap optical signals, obtained by the N numbers of FBGs, for the implementation of a filter.