title: Integrable microwave filter based on a photonic crystal delay line.
abstract: The availability of a tunable delay line with a chip-size footprint is a crucial step towards the full implementation of integrated microwave photonic signal processors. Achieving a large and tunable group delay on a millimetre-sized chip is not trivial. Slow light concepts are an appropriate solution, if propagation losses are kept acceptable. Here we use a low-loss 1.5 mm-long photonic crystal waveguide to demonstrate both notch and band-pass microwave filters that can be tuned over the 0-50-GHz spectral band. The waveguide is capable of generating a controllable delay with limited signal attenuation (total insertion loss below 10 dB when the delay is below 70 ps) and degradation. Owing to the very small footprint of the delay line, a fully integrated device is feasible, also featuring more complex and elaborate filter functions.
authors.affiliation: ITEAM Research Institute, Optical and Quantum Communications Group, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Sancho
authors.forename: Jerome
authors.initials: J
authors.lastname: Bourderionnet
authors.forename: Juan
authors.initials: J
authors.lastname: Lloret
authors.forename: Sylvain
authors.initials: S
authors.lastname: Combrié
authors.forename: Ivana
authors.initials: I
authors.lastname: Gasulla
authors.forename: Stephane
authors.initials: S
authors.lastname: Xavier
authors.forename: Salvador
authors.initials: S
authors.lastname: Sales
authors.forename: Pierre
authors.initials: P
authors.lastname: Colman
authors.forename: Gaelle
authors.initials: G
authors.lastname: Lehoucq
authors.forename: Daniel
authors.initials: D
authors.lastname: Dolfi
authors.forename: José
authors.initials: J
authors.lastname: Capmany
authors.forename: Alfredo
authors.initials: A
authors.lastname: De Rossi