| 摘要 |
The invention disclosed relates to a device for multiplexing/demultiplexing a multi-band DWDM system, providing reduced insertion losses. The device comprises first and second star couplers, a light dispersive element having a periodic frequency spectrum, interconnecting the first and second star couplers, a plurality of N input waveguides, connected to the first star coupler, and a plurality of M output waveguides, connected to the second star coupler, wherein the M outputs are each separated by a frequency interval .DELTA.f, the N inputs are each separated by M.DELTA.f, the free spectral range(FSR) = NM.DELTA.f, N is ~n integer greater than 1, and M is an integer equal to or greater than N. In o ne embodiment of the invention, wherein the the telecommunications window is divided into a plurality of sub-bands of M channels, a temperature controller is included to provide individual temperature set points for each sub-hand, to reduce wavelength centering errors.
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