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:
Feb. 16, 1988
Filed:
Oct. 04, 1985
Kiyohide Wakao, Atsugi, JP;
Haruhisa Soda, Atsugi, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A semiconductor laser including a stripe-shaped active layer, a clad region, and a diffraction grating. The stripe-shaped active layer has a thickness in a first direction, has a first energy gap, and extends in a second direction orthogonal to the first direction. The clad region surrounds the stripe-shaped active layer, and has a second energy band gap greater than the first energy band gap. The diffraction grating is provided in parallel with and adjacent to, the stripe-shaped active layer. The stripe-shaped active layer has a first portion with a first light propagation constant and with a first dimension in a third direction orthogonal to the first and second directions, and has a second portion with a second light propagation constant and with a second dimension in the third direction. The first dimension and the second dimension are different from each other. The second portion has a length L in the second direction. The stripe-shaped active layer satisfies the condition that a product of .DELTA..beta. and L is an odd multiple of .pi./2, where .DELTA..beta. is a difference between the first and second light propagation constants.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile