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:
Oct. 29, 1996
Filed:
Aug. 31, 1994
Applicant:
Inventors:
Yoshio Nabeyama, Fukuoka, JP;
Hirofumi Araki, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; H01S / ; G02F / ;
U.S. Cl.
CPC ...
359341 ; 359337 ;
Abstract
Disclosed is a method and apparatus for preventing the occurrence of surge light that may be caused by an off-to-on transition of input signal light in an optical amplifier using an erbium-doped optical fiber. An input electrical signal, optical modulator output, leakage light, or light output is monitored to detect the off-to-on transition of the signal light, and the energy level of the input signal light or pumping light is gradually increased from a low level to an operating level.