Abstract
A complex-valued multi-tap tunable microwave photonic filter based on single silicon-on-insulator microring resonator is presented. The degree of tunability of the approach involving two, three and four taps is theoretical and experimentally characterized, respectively. The constraints of exploiting the optical phase transfer function of a microring resonator aiming at implementing complex-valued multi-tap filtering schemes are also reported. The trade-off between the degree of tunability without changing the free spectral range and the number of taps is studied in-depth. Different window based scenarios are evaluated for improving the filter performance in terms of the side-lobe level.
Highlights
Microwave Photonics (MWP) is currently an active area of research [1,2] as it enables the generation, transport and processing functionalities of radio frequency (RF), microwave and millimeter-wave signals directly in the optical domain [3,4]
A novel tunable complex-valued multi-tap microwave photonic filter based on single SOI microring resonators (MRR) has been proposed and demonstrated
Filter response tunability without changing the free spectral range (FSR) can be accomplished by properly setting the emission wavelength of the N CW DBF lasers
Summary
Microwave Photonics (MWP) is currently an active area of research [1,2] as it enables the generation, transport and processing functionalities of radio frequency (RF), microwave and millimeter-wave signals directly in the optical domain [3,4]. Aiming at developing accurate MWP based filtering schemes, the efficient design of broadband tunable microwave phase shifters and tunable true time delay lines is of key importance [5]. For this purpose, the exploitation of Slow and Fast Light (SFL) effects, which refers to as the capability of controlling the group velocity of light in certain media [11], represents a very promising alternative [12]. The exploitation of nonlinear effects in optical fibers has led to adjustable free spectral range (FSR) and tunability [23] This technology is bandwidth-limited and it is very difficult to integrate [23]. The technique of combining OSSB modulation with passive optical filtering to implement complex-valued filters was originally proposed in [24], where phase shifters based on fiber Bragg gratings (FBG) instead of SOI MRR were considered
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