Optical amplifiers
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United States of America Patent
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-
Apr 26, 1988
Grant Date -
N/A
app pub date -
Dec 11, 1985
filing date -
Dec 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical signal pulse to be amplified and a pump signal pulse are launched consecutively into one end of an optical fiber, which may comprise a separate fibre or part of a transmission line. The pulses differ in wavelength by one or more Stokes shift and the order of launch is determined by the relative group velocities in the fibre. Owing to dispersion in the fibre the pulses overlap and overtake one another while they are transmitted along the fibre, the signal pulse being amplified as a result of Raman stimulated emission and compressed as a result of power depletion from the pump pulse, thus increasing the bandwidth of the transmission line.
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