Method and apparatus for implementing a multi-channel...

Details Method and apparatus for implementing a multi-channel... Method and apparatus for implementing a multi-channel...

2006-11-14

2006-11-14

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Holographic system or element

Having particular recording medium

C359S030000, C359S003000, C359S566000, C359S001000

Reexamination Certificate

active

07136206

ABSTRACT:
The present invention provides a multi-channel tunable filter and methods for making such a filter. In one embodiment, the filter comprises a bank of gratings imprinted into a filter material, such as Lithium Niobate. In another embodiment, the filter comprises a bank of gratings imprinted on a thin-film filter. An optical read-head comprising a pair of lenses is configured to pass light from within an optical fiber carrying multiple wavelengths through an appropriate grating to extract or drop a specific wavelength. To ensure continuous data transmission, the filter is tuned to a wavelength by configuring the read-head to move in a hitless manner. In one embodiment, the gratings are recorded by the interference of two beams. A first plane wave reflects off a first mirror stack and a second plane wave reflects off a second mirror stack. In another embodiment, the gratings are recorded by a phase masking method.

REFERENCES:
patent: 5413884 (1995-05-01), Koch et al.
patent: 5491570 (1996-02-01), Rakuljic et al.
patent: 6760526 (2004-07-01), Ellison et al.
patent: 2001/0021294 (2001-09-01), Cai et al.
patent: 2002/0015919 (2002-02-01), Kristensen et al.
patent: 2003/0077039 (2003-04-01), Kurihara et al.
patent: 2004/0264858 (2004-12-01), Rothenberg

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