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. 28, 1992
Filed:
Jun. 20, 1990
Applicant:
Inventor:
Eiji Yamamoto, Oume, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 50 ; 372 26 ; 372 46 ; 372 96 ;
Abstract
An optical semiconductor device which can independently control optical gains or optical characteristics electrically by forming two layers on two pn junctions with either a pnp structure or an npn structure of a band gap energy narrower than adjacent layers thereto to enable increase of modulation width of a monolithic integrated laser with an optical modulator such as wavlength tunable laser or control of spectrum forms of a semiconductor optical amplifier.