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:
Jul. 28, 1998
Filed:
Jan. 24, 1997
Ando Electric Co., Ltd., Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical frequency sweep signal generator using an optical frequency variable bandpass filter which can be practically used is provided. The optical frequency sweep signal generator comprises: a circulation control circuit for generating a first electric signal which indicates the start and the end of a sweep; an optical loop circuit; an optical frequency variable bandpass filter, provided in the loop circuit, for suppressing circulation of natural emission light output from an optical amplifier; a light receiving element for converting a part of light output from the optical loop circuit into a second electric signal; a sweep signal analyzing circuit for outputting a set value for compensating for a difference between the center frequency of the optical frequency variable bandpass filter and the optical frequency of the pulsed light based on the first and second electric signals; and a driving circuit for supplying a driving signal for determining the center frequency of the optical frequency variable bandpass filter to the optical frequency variable bandpass filter, based on the first electric signal and the set value.