| 摘要 |
<p>A channel dropping filter includes three frequency routing devices (30,31,32), one which functions as an input device (30) and two which function as output devices (31,32). The first frequency routing device has one input (16) 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 (21). Each optical switch has a first output coupled in consecutive order to one of the N inputs (161,...16N) of the first output frequency routing device (31) and a second output coupled in consecutive order to one of the N inputs (161,...16N) of the second output frequency routing device (32). 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.</p> |
