Optical transmission link with low slope, raman amplified fiber
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United States of America Patent
Stats
-
Sep 6, 2005
Grant Date -
Feb 12, 2004
app pub date -
Aug 22, 2001
filing date -
Aug 31, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An optical fiber transmission link has a first optical fiber with a high effective area coupled to a second, downstream optical fiber with a low effective area. The downstream fiber has non-zero dispersion and low dispersion slope. Characteristics of the upstream fiber permit the launching of high power channels in a wavelength division multiplexing, and characteristics of the downstream fiber enable Raman amplification along that fiber to extend the transmission distance before a need for discrete amplification. The downstream fiber has a non-zero dispersion in the C-band wavelengths and a low dispersion slope and has low attenuation at the signal and pump wavelengths. Refractive-index profiles include variations of W-type fibers that may include outer rings of positive or negative index. Pumping of the downstream fiber may occur either co-directionally to the signals, counter-directionally to the signals, or in both directions.
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