Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-01-21
1996-06-11
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
H04J 1402
Patent
active
055261531
ABSTRACT:
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.
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AT&T Corp.
Mayer Stuart H.
Pascal Leslie
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