| 摘要 |
An optical demultiplexing structure for demultiplexing channels from a wavelength multiplexed optical signal comprising a first optical filter (115, 215, 315) , a second optical filter (117, 217, 317), and at least one third optical filter (120, 220, 415, 520, 123, 223, 515, 615), wherein the first optical filter (115, 215, 315) has a band-pass characteristic for extracting a first set of channels from the optical signal, and the second optical filter (117, 217, 317) has a cut-off wavelength that corresponds to a wavelength that is within the pass-band of the first optical filter, and wherein the first optical filter (115, 215, 315) is connected to the second optical filter (117, 217, 317) such that the channels that remain after extraction of the set of channels by the first optical filter are filtered by the second optical filter (117, 217, 317) such that a second set of channels remains, and wherein the at least one third optical filter (120, 220, 415, 520, 123, 223, 515, 615) has a pass-band arranged to extract a subset of channels from the second set of channels that is spaced apart from the first set of channels. A multiplexing structure and demultiplexing and multiplexing methods are also described. |
