H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 14/02 (2006.01) G02B 5/20 (2006.01) G02B 6/34 (2006.01) H04B 10/12 (2006.01) H04Q 11/00 (2006.01)
Patent
CA 2135223
An optical filter is formed from an optical frequency routing device having N inputs and N outputs, where N > 1. A plurality of waveguides each couple one of the outputs to one of the inputs of the frequency routing device in a consecutive order to form a series of optically transmissive feedback loops. As a result of this arrangement, an input signal composed of a plurality of multiplexed optical frequencies directed to an input of the routing device is first demultiplexed to yield a sequence of demultiplexed frequency components which are directed to the outputs of the routing device. The demultiplexed frequencies may be rerouted back to the inputs of the routing device via the optical feedback loops between the outputs and the inputs. A remaining output that is not incorporated into one of the feedback loops is provided for receiving the resulting multiplexed output signal. Rather than rerouting the demultiplexed frequency components back through the routing device via optical loops, one or more of the loops may be opened up to either drop, add, or drop and add a frequency component.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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