Abstract
Conventional optical filter is typically easy to realize adjustable central wavelength and bandwidth, but it's quite challenging to obtain reconfigurable free spectral range (FSR), thus limiting its application in a variety of fields. In this paper, we propose novel schemes and implement two kinds of tunable and reconfigurable optical notch filters (TRNF) on Silicon-on-Insulator (SOI) platform for the first time. The experimental results indicate that the FSR reconfigurable range is 20 GHz–200 GHz for a five-stage TRNF based on microring resonators (MRR), and the central wavelength can be tuned over the whole free spectral range. Moreover, a five-stage TRNF based on Mach-Zehnder interferometers (MZI) offers a broader FSR reconfigurable range of 7.5 GHz–232.5 GHz. Our results will improve the spectrum usage efficiency of programmable photonic integrated circuits and pave the way for the development of next generation elastic optical network (EON).
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