title: Compact, low cross-talk CWDM demultiplexer using photonic crystal superprism.
abstract: This paper addresses the problem of a photonic crystal (PhC) superprism design for coarse wavelength division multiplexing (CWDM) application. The proposed solution consists in using a PhC structure that presents an efficient balance between the wavelength dispersion and the beam divergence. It is shown that a bidimensional rhombohedral lattice PhC displays both a high beam collimation and an important wavelength dependant angular dispersion. We report the design, fabrication and experimental demonstration of a 4-channel optical demultiplexer with a spectral spacing of 25 nm and a cross-talk level of better than -16 dB using a 2800 microm(2) PhC region. The minimum of insertion losses of the demultiplexer is less than 2 dB. The obtained results present an important milestone toward PhC devices for practical applications.
authors.affiliation: Institut d'Electronique Fondamentale, CNRS UMR 8622, Univ Paris Sud, 91405 ORSAY Cedex, France. damien.bernier@u-psud.fr
authors.forename: Damien
authors.initials: D
authors.lastname: Bernier
authors.forename: Xavier
authors.initials: X
authors.lastname: Le Roux
authors.forename: Anatole
authors.initials: A
authors.lastname: Lupu
authors.forename: Delphine
authors.initials: D
authors.lastname: Marris-Morini
authors.forename: Laurent
authors.initials: L
authors.lastname: Vivien
authors.forename: Eric
authors.initials: E
authors.lastname: Cassan