Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1994-02-24
1996-04-09
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359134, 359160, 372 6, H01S 313, H01S 3091
Patent
active
055067239
ABSTRACT:
In an optical receiver of the prior art, a multistage fiber-optic amplifier in which optical signal components propagating along different paths in the same direction beat with one another generate noise in addition to the noise due to spontaneous emission in the amplifier. A two-stage fiber-optic amplifier, according to the invention is provided in which a first section of optical fiber (F1) is pumped opposite to or in the direction of propagation of the optical signal and a second section of optical fiber (F2) is pumped in or opposite to the direction of propagation. A pump-light source (1), the sections of optical fiber (F1, F2), and couplers (K1, K2, K3) are arranged in such a way that any signal components propagating along different paths in the same direction will not beat with one another.
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patent: 5253104 (1993-10-01), Delavaux
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"High Sensitivity Optical Pre-Amplifier at 10 Gbit/s Employing A Low Noise Composite EDFA with 46 dB Gain" by R. I. Laming et al.
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ALCATEL N.V.
Moskowitz Nelson
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