Hitless tunable filter

Details Hitless tunable filter Hitless tunable filter

2007-07-24

2007-07-24

Leung, Quyen (Department: 2874)

Optical waveguides

With optical coupler

C385S016000, C385S024000

Reexamination Certificate

active

11147214

ABSTRACT:
A method for implementing a truly hitless tunable filter for use in adding and/or dropping channels in a wavelength division multiplexed (WDM) network is disclosed. An exemplary method for filtering an optical signal may include providing a composite optical signal having several wavelengths including a first wavelength, a second wavelength and other wavelengths. The method may include passing the first wavelength through a filter and reflecting the second wavelength and the other wavelengths with the filter. The method may include making the first wavelength available to a drop port, and making the second wavelength and the other wavelengths available to an output port.

REFERENCES:
patent: 6219474 (2001-04-01), Cai et al.
patent: 6292299 (2001-09-01), Liou
patent: 6320996 (2001-11-01), Scobey et al.
patent: 6594059 (2003-07-01), Flanders
patent: 6718086 (2004-04-01), Ford et al.
patent: 6980713 (2005-12-01), Hwang et al.
patent: 2003/0063842 (2003-04-01), Cormack et al.
patent: 2004/0247239 (2004-12-01), Eldada

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