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:
Oct. 20, 1998
Filed:
Sep. 16, 1994
Applicant:
Inventors:
Akira Ajisawa, Tokyo, JP;
Tomoji Terakado, Tokyo, JP;
Masayuki Yamaguchi, Tokyo, JP;
Keiro Komatsu, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
257 12 ; 372 26 ; 372 50 ;
Abstract
An optical semiconductor device comprises a stripe-mesa structure provided on a semi-insulating substrate. The stripe-mesa structure comprises an undoped light absorption layer sandwiched by cladding layers, and by burying layers on both sides. With this structure, the device capacitance is decreased to provide wide bandwidth and ultra-high speed operation properties. This device can be applied to an optical modulator, an integrated type optical modulator, and an optical detector.