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:
Nov. 01, 1994
Filed:
Nov. 04, 1993
Applicant:
Inventor:
Hideo Kosaka, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 50 ; 372 96 ; 257 85 ; 257 84 ; 257 97 ;
Abstract
The invention provides a semiconductor optical surface transmission device comprising a laser element and a photo-transistor element formed on a semiconductor substrate through which light transmissions are made. Each of the laser element and the photo-transistor element has top and bottom reflective mirrors, but the bottom reflective mirror of the photo-transistor element includes a phase inversion layer to form a double resonator for detecting injection lights in a wide range of those wavelength at a high efficiency of absorption of the injection lights.