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:
Dec. 27, 1988
Filed:
Sep. 12, 1986
Georg Boeck, Munich, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
An external optical resonator for use with a semiconductor laser has a high selectivity and phase steepness for the input reflection factor in the region of the resonance frequency and is highly stable. An optical directional coupler is coupled to the semiconductor laser and two gates of the coupler are connected to one another by a radiation transmission path for externally transmitting radiant power. The coupling factor of the directional coupler is selected such that the radiation coupled into one waveguide of the coupler is nearly completely coupled over to the other waveguide of the coupler. Nearly complete suppression of all secondary modes is obtained by using a wavelength selective directional coupler in place of a broad band directional coupler.