Optical waveguides – With optical coupler – Particular coupling structure
Patent
1998-05-19
1999-11-16
Ullah, Akm E.
Optical waveguides
With optical coupler
Particular coupling structure
65409, G02B 600, G02B 626
Patent
active
059872012
ABSTRACT:
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 2.sup.m-1 MWDMs cascaded in m-th stage, and the window spacing of the m-th stage MWDMs is 2.sup.m-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.
REFERENCES:
patent: 5295210 (1994-03-01), Nolan et al.
patent: 5408554 (1995-04-01), Cryan et al.
patent: 5450804 (1995-09-01), Stowe
patent: 5754720 (1998-05-01), Quinn et al.
patent: 5809190 (1998-09-01), Chen
Applied Fiber Optics, Inc.
Chang Chi Ping
Ullah Akm E.
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