Communication system comprising a low cost optical filter

Details Communication system comprising a low cost optical filter Communication system comprising a low cost optical filter

1996-05-28

1997-09-30

Ullah, Akm E.

Optical waveguides

With optical coupler

Plural

G02B 626, G02B 642

Patent

active

056733429

ABSTRACT:
An optical fiber communication system according to the invention comprises an optical fiber filter that can be manufactured at low cost and that can be conveniently incorporated into the system, substantially like a conventional fiber jumper. The filter comprises a length L of axially uniform optical fiber selected to have substantially no loss (e.g., <1 dB) at a wavelength .lambda..sub.1, and to have relatively high loss (e.g., >20 dB) at a wavelength .lambda..sub.2. The length L will typically be less than 100 m. In one embodiment the optical fiber is a single mode optical fiber at .lambda..sub.1 (e.g., 1.3 .mu.m) that does not have a guided mode at .lambda..sub.2 (e.g., 1.55 .mu.m). In another embodiment the fiber contains a dopant that does substantially not absorb radiation of wavelength .lambda..sub.1, but substantially absorbs at .lambda..sub.2. In the second embodiment, .lambda..sub.1 can be greater than .lambda..sub.2. Fiber filters according to the invention can be advantageously used in a variety of communication systems, and exemplary systems are disclosed.

REFERENCES:
patent: 4592619 (1986-06-01), Weidel
patent: 4621929 (1986-11-01), Phillips
patent: 4946250 (1990-08-01), Gonthier
patent: 5475780 (1995-12-01), Mizrahi
patent: 5570440 (1996-10-01), Mizrahi
patent: 5606332 (1997-02-01), Darden et al.
patent: 5606434 (1997-02-01), Feldman et al.
"Fabrication and Characterization of Low-Loss Optical Fibers Containing Rare-Earth Ions", by S.B. Poole, Journal of Lightwave Technology, vol. LT-4, No. 7, Jul. 1986.
Proceedings of IOOC-95, paper WA 2-5, author --J. Nishimura et al., p. 26. This reference is unavailable. We will continue to try to obtain it. If it comes to us, we will submit it to the Patent Office.

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