Programmable Photonic Microwave Filters Monolithically Integrated in InP–InGaAsP

Integrable microwave filter based on a photonic crystal delay line

“…Preliminary efforts towards integration have relied on resonant delay lines provided by ring cavities and coupled resonant optical waveguides [17][18][19][20] . These approaches suffer from an intrinsic trade-off between dispersion and bandwidth, preventing broadband operation.…”

Integrated Microwave Photonics for Wideband Signal Processing

“…Immense effort has since been put into investigating on-chip programmable filters based on this approach. These have been successfully demonstrated on various integrated platforms such as InP-InGaAs, SOI and hybrid silicon [55][56][57]. The FIR based scheme being discrete in nature, however, exhibits a periodic transfer function, which gives rise to the presence of multiple harmonic passbands within the spectral range of interest [4].…”

Software-defined reconfigurable microwave photonics processor

“…The activity in IMWP has been almost exclusively focused towards the so-called Application Specific Photonic Integrated Circuits (ASPICs) where a particular circuit and chip configuration is designed to optimally perform a particular MWP functionality. ASPICs have been developed in three main technologies: Indium Phosphide (InP) [13][14][15], Silicon on Insulator (SOI) [16,17] and Silicon Nitride (Si3N4) for a number of applications [18][19][20][21][22]. As a result, there are almost as many technologies as applications and, due to this considerable fragmentation, the market for many of these application-specific technologies is too small to justify their further development into low-cost industrial mass-volume manufacturing processes.…”