Rebecca C Jordan

US Patent:

6389203, May 14, 2002

Filed:

May 17, 2000

Appl. No.:

09/573086

Inventors:

Rebecca Jordan - Millington NJ
Christi Kay Madsen - South Plainfield NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 612

US Classification:

385 50, 385131, 385 14

Abstract:

In accordance with the invention, a tunable optical all-pass filter with a substrate-supported multilayer waveguiding structure. A first layer including a waveguiding optical ring resonator, a second layer for spacing, and a third layer including a curved waveguide. The curved waveguide is optically coupled to the resonator by two spaced apart optical couplers extending through the spacing layer, and tunability is provided by a first phase-shifter to control the optical pathlength of the resonator and a second phase-shifter operative on the waveguide to control the strength of coupling between the waveguide and the resonator. In one embodiment, the waveguide and the resonator are horizontally spaced apart in the non-coupling regions to provide optical isolation. In another, the waveguide and resonator can overlap horizontally, but the spacer layer is thicker in the non-coupling regions to provide optical isolation.

US Patent:

6522795, Feb 18, 2003

Filed:

May 17, 2000

Appl. No.:

09/573988

Inventors:

Rebecca Jordan - Millington NJ 07946
Christi Kay Madsen - South Plainfield NJ 07080

International Classification:

G02B 634

US Classification:

385 10, 385 37

Abstract:

In accordance with the present invention, a waveguide grating comprises a core and a first cladding material adjacent the core. The first cladding is configured, as by etching, to provide a periodic grating, and a second cladding material having a controllable refractive index overlies the first cladding material. If the index of the second cladding is different from that of the first cladding, the configuration of the first cladding provides an optical grating. If, however, the controllable index of the second cladding is adjusted to equal that of the first cladding, the grating becomes essentially transparent. This grating is particularly useful as a reconfigurable add/drop filter in a WDM optical communication system. It is also useful in grating-assisted couplers and variable optical delay lines.