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. 03, 2006
Filed:
Feb. 05, 2003
Tomoyoshi Kataoka, Yokohama, JP;
Akira Hirano, Yokohama, JP;
Akihiko Matsuura, Yokosuka, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
The optical transmission circuit of the present invention has an optical modulatorwhich modulates continuous light at wavelength λo with a signal at repetition frequency fo Hz and outputs alternating phase-inverted pulse light; a bias voltage applying unitwhich applies a bias voltage to the optical modulator; an optical power spectrum measuring unithaving frequency resolution of less than fo Hz which measures the optical power spectrum of light output from the optical modulator; and a control circuit which controls the bias voltage via the bias voltage applying unitbased on measurements of the power spectrum of the output light of the optical modulator, so as to minimize the power intensity of the carrier spectrum component of wavelength λo, or to maximize the power intensity of the spectrum component in both side bands.