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. 28, 2000
Filed:
Sep. 03, 1998
Applicant:
Inventors:
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
257461 ; 257233 ; 257462 ; 438 48 ;
Abstract
A photodiode which senses only .lambda.2 without WDM in optical communication systems containing two signals of different wavelengths .lambda.1 and .lambda.2. The photodiode has a filter layer whose band gap wavelength .lambda.g satisfies an inequality of .lambda.1<.lambda.g<.lambda.2 for annihilating .lambda.1. For vanishing tails of signals, the peripheral pn-junction is formed around the central pn-junction. In the case, an n-electrode is mounted on both the peripheral p-region and the peripheral n-region.