The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 1996
Filed:
Feb. 24, 1994
Bernhard Junginger, Herrenberg, DE;
Alcatel N.V., Amsterdam, NL;
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.