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:
Mar. 24, 1998
Filed:
Jul. 15, 1996
Masayuki Yamaguchi, Tokyo, JP;
Nobutaka Watanabe, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A modulating circuit for a semiconductor optical modulator is composed of a driver 3 DC-coupled to an optical modulator 2, a load resistor 4 connected in parallel to the modulator 2, and a constant current source 5 connected in parallel to the optical modulator 2 for drawing out the photo-current generated in the optical modulator 2 by absorption of light emitted from a semiconductor laser. The modulating circuit can perform light intensity modulation with low wavelength chirping using a driver DC-coupled to the optical modulator 2. The drawing out current is approximately equal to or more than an average of photo-current which is generated in the optical modulator 2 by light absorption at the time of modulation.