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:
Aug. 13, 1991
Filed:
Apr. 16, 1990
Robert Lang, Pasadena, CA (US);
Albrecht Mozer, Bietigheim, DE;
Alcatel N.V., Amsterdam, NL;
Abstract
A switchable DFB (distributed feedback) laser which includes a waveguide layer having an impressed diffraction grating composed of two or more superposed subgratings having different respective grating constants. The diffraction grating is either frequency modulated (FIG. 3a) or amplitude modulated (FIG. 3b) or is a mixed form of these two types of modulation. Each subgrating can be employed to generate an emission wavelength that is a function of the grating period. By changing the temperature or changing the injection current, the effective index of refraction of the laser is changed, thus enabling the setting of an emission wavelength which is a function of the modulated diffraction grating. The switchable DFB laser according to the present invention may be employed for optical data transmission and particularly in narrowband wavelength multiplex operation.