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:
Jan. 11, 2000
Filed:
Sep. 10, 1998
Naoto Saeki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An input signal input to a 180 degree distributor is distributed as two signals, one of which with its phase inverted 180 degrees is input to a first modulation light source and the other with its phase unchanged is input to a second modulation light source; both signals are modulated with the intensity and the frequency of the light emission dependent on signal amplitude. The modulated signals are coupled by an optical coupler and subjected to heterodyne detection through a photodetector, where their light intensity modulation components offset each other when added and the multiplication of their light frequency components results in the frequency transition quantity doubling.
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