| 摘要 |
The present invention relates to an apparatus and method of making a Dense Wavelength-Division Multiplexer (DWDM) using a Fused-Biconical Taper ("FBT") technique. The DWDM according to the present invention comprises a multiple of Multi-window Wavelength-Division Multiplexers ("MWDMs") which cascade together in several stages, each stage has several MWDMs having an identical window spacing. For a N-channel DWDM, there are 2m-1 MWDMs cascaded in m-th stage, and the window spacing of the m-th stage MWDMs is 2m-1 DELTA lambda , where m is from 1 to (logN/log2), for example, the first stage(m=1) having 1 MWDM and the window spacing is DELTA lambda , the second stage(m=2) having 2 MWDMs and the window spacing is 2 DELTA lambda , the third stage(m=3) having 4 MWDMs and the window spacing is 4 DELTA lambda , etc., and the (logN/log2)-th stage has (N/2) MWDMs with a window spacing (N/2) DELTA lambda . The number N could be 2, 4, 8, 16 or more.
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