US 5,493,625 A · Fast tunable channel dropping filter

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.

Claims12

Dependent claims

An optical channel dropping filter comprising:

an input frequency routing device having an input for receiving a signal composed of a plurality of multiplexed optical frequencies;
and
at least first and second output frequency routing devices responsive to the input frequency routing device, the first and second output frequency routing devices having respective first and second outputs, the first output carrying at least one of the multiplexed optical frequencies and the second output carrying the remainder of the optical frequencies.

Dependencies are inferred from the claim text.

Fast tunable channel dropping filter

Life of this patent

Fast tunable channel dropping filter

Life of this patent

Abstract

Claims12