05115338 is referenced by 77 patents and cites 8 patents.

This invention relates to an Erbium-doped fiber amplifier having multiple stages of amplification for providing enhanced performance. More specifically, optical means is located intermediate first and second stages of doped optical amplifying fibers adapted to receive a pump signal at a pump wavelength where the optical means is adapted to modify the net gain characteristics of the multi-stage amplifier. Presently, all known Erbium-doped fiber amplifiers utilize relatively simple single stage amplifiers which support required ancillary optically passive components such as isolators, filters, pump multiplexers, power monitors and the like at either end of the amplifier. This requirement of having the passive optical element at an end of thhe optical amplifier not only lends to relatively stringent design and fabrication tolerances for a high performance optical amplifier, but it restricts the design of the Erbium-doped fiber amplifier to an embodiment which prevents exploitation of the various unique properties of the Erbium-doped fiber amplifier.

Title
Multi-stage optical amplifier
Application Number
530665
Publication Number
5115338
Application Date
April 12, 1991
Publication Date
May 19, 1992
Inventor
Clinton R Giles
Holmdel
NJ, US
David J DiGiovanni
Scotch Plains
NJ, US
Agent
Eli Weiss
Assignee
AT&T Bell Laboratories
NJ, US
IPC
H01L 15/00
G02B 6/26
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