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:
Apr. 13, 1993
Filed:
Nov. 07, 1991
Hajime Suhara, Yokohama, JP;
Akira Tanioka, Kawaguchi, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
Traveling-wave type light amplifier having a waveguide region, both end portions of which are tapered such that the tip of each end has a width and a thickness which are equal to each other. Due to the shape of an end portion of the waveguide region, the output light of the amplifier hardly depends on two linearly polarized wave components. Hence, the near-field pattern of the light-emitting point and the far-field pattern of the output beam are of rotation symmetry. Thus, the light amplifier can be optically coupled to an optical fiber with high efficiency. In addition, since the center portion of the waveguide region has a uniform width, just like the waveguide of the conventional light amplifier, device characteristics such as a current density are not changed.