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:
Dec. 12, 1995
Filed:
May. 06, 1993
Applicant:
Inventor:
Rolf Heidemann, Tamm, DE;
Assignee:
Alcatel SEL Aktiengesellschaft, Stuttgart, DE;
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
359177 ; 359174 ; 359179 ; 359110 ;
Abstract
If, in optical communication systems using fiber-optic amplifiers, the optical isolator at the input is omitted on cost grounds and because of the deterioration of the noise characteristics caused by the insertion loss, a giant pulse may be developed when a fiber-optic connector at the input is being separated. To avoid this occurrence, use is made of a monitoring device (7) which, when the power input to the fiber-optic amplifier (4, 5, 3, 6) drops below a given threshold, quickly turns off the current of the pump laser (4) or interrupts the light path of the pump laser (4).