Wideband Reconfigurable Multifunctional Analogue Photonic Chip Based on Planar Waveguides

Abstract

Wideband reconfigurable multifunctional analogue photonic chip using planar waveguides is proposed and analysed. A variety of planar Bragg gratings (PBGs) are designed and optimised to achieve three functions of fractional Hilbert transform (FHT), optical integration (OI) and optical differentiation (OD) based on the reflection spectrum. We firstly designed the unit chip implementation to verify the fractional-order tunable HT and then integrated the multifunctional units with cascaded MZIs into a single chip. The switching reconfiguration of multiple functions was achieved by optical phase modulation. Finally, we performed the analysis of femtosecond optical pulses to verify the processing effect of ultrafast photonic simulation and computation. The proposed chip achieves the operating bandwidth beyond 160 GHz comprehensively. The root mean squared errors (RMSEs) of the multifunctional temporal optical pulse processing are below 3%. This provides a potential path for ultrafast all-optical signal processing in microwave photonics.