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. 19, 1991
Filed:
Sep. 06, 1990
Karsten Droegemueller, Feldkirchen-Westerham, DE;
Ekkehard Klement, Graefelfing, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An optical arrangement for the feedback-free coupling of the laser emission emitted by a semiconductor laser into an optical fiber, characterized by a first optical lens for receiving the output of the semiconductor laser, a first optical isolator composed of a Faraday rotator and a polarizer following in the propagation direction of the laser emission, a second optical isolator being composed of a second Faraday rotator and a second polarizer that has a higher blocking attenuation compared to the blocking attenuation of the first polarizer being arranged between the first lens and the optical isolator. In order to use the optical arrangement in an optical heterodyne system, the blocking attenuation of at least -70 dB is obtainable in this arrangement.