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:
Aug. 17, 1993
Filed:
Jan. 17, 1992
Applicant:
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; H01S / ; H01L / ;
U.S. Cl.
CPC ...
385131 ; 385 14 ; 385130 ; 372 43 ; 372 50 ; 372 44 ; 437 51 ; 437129 ;
Abstract
An optical waveguide is fabricated on a substrate of n-type indium phosphide, and comprises a guiding layer of intentionally undoped indium gallium arsenide sandwiched between lower and upper cladding layers of intentionally undoped indium phosphide, wherein the upper cladding layer has a ridge epitaxially grown on a part of an upper surface of the upper cladding layer so that the optical waveguide achieves low propagation losses.