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Apparatus and method of making a fused dense wavelength-division multiplexer

  • US 5,809,190 A
  • Filed: 02/12/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 11/13/1996
  • Status: Expired due to Term
First Claim
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1. A multi-window wavelength-division multiplexer (MWDM), comprising:

  • a first and a second optical fibers about the same diameter crossed and fused together by a heating source at a mid-position, said two fibers each having a longitudinal core surrounding by claddings and each having a first end and a second end, said two longitudinal cores and claddings gradually tapered at an angle together for a length at said mid-position merging to form a fiber cavity extended therefrom for a distance with a diameter smaller than that of said two fibers, said fused fiber reversely tapered at said angle separating into two fibers to form a fused bi-conical fiber, said fused bi-conical fiber is subsequently fixed by two glue balls on a substrate and covered by a sealed tube to form a 2×

    2 MWDM;

    wherein a first light entering said first end of said first fiber appears on said second end of said first fiber and a second light entering said first end of said first fiber appears on said second end of said second fiber;

    wherein a first light entering said second end of said first fiber appears on said first end of said first fiber and a second light entering said second end of said second fiber appears on said first end of said first fiber;

    wherein said first light has a first set of wavelengths and said second light has a second set of wavelengths, said first set and second set of wavelengths each consisting of a multiple of different wavelengths in the range of 1280 nm to 1380 nm and 1400 nm to 1600 nm; and

    wherein each of said multiple of different wavelengths from said first set and second set of wavelengths has a window spacing identical with another and said wavelengths in said two sets are complemented to each other.

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