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1. (WO2005106550) DUAL BAND OPTICAL MUX/DEMUX AND APPARATUS COMPRISING THE SAME

Pub. No.:    WO/2005/106550    International Application No.:    PCT/EP2004/004583
Publication Date: Nov 10, 2005 International Filing Date: Apr 30, 2004
IPC: G02B 6/293
Applicants: PIRELLI & C. S.P.A.
CHERCHI, Matteo
Inventors: CHERCHI, Matteo
Title: DUAL BAND OPTICAL MUX/DEMUX AND APPARATUS COMPRISING THE SAME
Abstract:
An optical device for splitting/combining a first and a second optical wavelength band has a first, a second and a third optical splitting device optically coupled in cascade and a first and a second differential optical delay device optically coupled to, and interleaved between, the optical splitting devices. This structure together with a suitable choice of the coupling coefficients of the splitting devices and of the differential delays of the differential optical delay devices achieves flattened pass bands and stop-bands and makes the optical device tolerant fluctuations of the structural parameters. An apparatus comprising the optical device is also disclosed for use in fiber-to-the-premises networks.