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.
|Patent number||WO2005106550 A1|
|Publication status||Published - 10 Nov 2005|
|MoE publication type||Not Eligible|