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. 15, 1998
Filed:
Dec. 30, 1996
Hiroaki Yamamoto, Higashiosaka, JP;
Hiroyuki Sasai, Katano, JP;
Susumu Morikura, Yawata, JP;
Katsuyuki Fujito, Higashiosaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A signal processing circuit 113 subjects a transmission signal outputted from a signal source 111 and a carrier outputted from a carrier generation circuit 112 to predetermined signal processing, to generate a modulation signal amplitude-modulated by the transmission signal and so adapted that its envelop on the high level side (or on the low level side) has a shape analogous to the waveform of the transmission signal and its envelope on the low level side (or on the high level side) is at an approximately constant level. A light source 114 converts the modulation signal into a light intensity modulation signal, and outputs the light intensity modulation signal to an optical coupler 120. The above-mentioned signal processing is performed by the signal processing circuit 113, whereby the spectrum distribution of the light signal outputted from the light source 114 is dispersed, and the peak value of light spectra is decreased. The peak value of beat noise produced after receiving is proportional to the peak value of the light spectra, whereby the peak value of the beat noise is also decreased.