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:
Jan. 14, 1992
Filed:
May. 01, 1990
Peter J de Groot, Bethel, CT (US);
Francis X D'Amato, Danbury, CT (US);
Kotik Lee, Danbury, CT (US);
Hughes Danbury Optical Systems, Inc., Danbury, CT (US);
Abstract
An optical transmitter includes at least one single-mode type laser diode for producing laser emission, and an external cavity with a partial reflector for reflecting a portion of the emission back into the laser. A DC current operates the laser in a first mode with a first frequency of emission. The laser is pulsed with a predetermined sequence of signal pulses each shifting the laser to a second mode with a second frequency different than the first frequency. The frequency shifting thereby constitutes information in a laser beam corresponding to the sequence of signal pulses. The laser system may be formed of a plurality of laser diodes in an array, so that the reflector reflects emission back into the diodes to lock them in the alternate modes of operation.