Optical waveguides – With optical coupler – Plural
Patent
1993-11-16
1996-02-20
Healy, Brian
Optical waveguides
With optical coupler
Plural
385 14, 385 16, 385 20, 385 39, 385 40, 385 41, 385 42, 385 46, 359115, 359117, 359124, 359127, 359128, G02B 624, G02B 628
Patent
active
054936250
ABSTRACT:
A channel dropping filter includes three frequency routing devices, one which functions as an input device and two which function as output devices. The first frequency routing device has one input for receiving the input signal and at least N outputs, where N corresponds to the number of frequencies that compose the input signal. The N outputs of the first frequency routing device are each coupled to an optical switch. Each optical switch has a first output coupled in consecutive order to one of the N inputs of the first output frequency routing device and a second output coupled in consecutive order to one of the N inputs of the second output frequency routing device. A controller is employed to selectively switch the optical switches between first and second states for directing each optical frequency component demultiplexed by the first frequency routing device to the first and second output frequency routing device, respectively.
REFERENCES:
patent: 4673270 (1987-06-01), Gordon
patent: 5002350 (1991-03-01), Dragone
patent: 5093876 (1992-03-01), Henry et al.
patent: 5136671 (1992-08-01), Dragone
patent: 5233453 (1993-08-01), Sivarajan et al.
patent: 5309534 (1994-05-01), Cohen et al.
patent: 5339157 (1994-08-01), Glance et al.
AT&T Corp.
Healy Brian
Mayer Stuart H.
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