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. 08, 1995
Filed:
Jun. 28, 1994
Stephane Morin, Lannion, FR;
Franck Giraud, Pleumeur Bodou, FR;
ALCATEL CIT, Paris, FR;
Abstract
A particular embodiment comprises: a semiconductor laser; a Mach-Zehnder type modulator; an analog adder for adding a modulation signal representing binary data with a DC bias voltage; a coupler for taking off a fraction of the modulated light signal; a photodiode; an amplifier; a bandpass filter tuned to a frequency equal to the binary data transmission rate; an amplifier; an amplitude detector; an amplifier; and a microprocessor associated with an analog-to-digital converter and with a digital-to-analog converter to modify the bias voltage so as to cause the amplitude of the spectrum line extracted by the filter and the amplitude detector to remain below a fixed threshold value. The invention is applicable to digital data transmissions.