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. 23, 1999
Filed:
Jul. 09, 1997
Applicant:
Inventors:
Kazuaki Nishikata, Kanagawa, JP;
Michinori Irikawa, Kanagawa, JP;
Assignee:
The Furukawa Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 14 ; 385131 ; 257188 ; 257441 ;
Abstract
A waveguide type semiconductor photodetector comprises a n-InP substrate, and a laminate including a first and second optical confinement layers and an undoped optical absorption layer interposed therebetween. The optical absorption layer has a thickness between 0.2 and 0.5 .mu.m, and a bandgap wavelength smaller than the bandgap wavelength of the first and second optical confinement layers. The photodetector has a large mode field diameter and a small coupling loss between the same and a glass fiber.