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:
Feb. 28, 1995
Filed:
May. 11, 1994
Gordon W Ries, Plano, TX (US);
Alcatel Network Systems, Inc., Richardson, TX (US);
Abstract
A laser modulation controller (10) provides laser modulation control by DC bias (54) to a laser (22) with a first control tone (32), amplitude modulating (70) a non-return to zero (NRZ) input working signal (18) to be converted to light output with a second control tone (30), detecting the first control tone from a portion of the light output of the laser (88, 26) as a third signal (58) which is proportional to laser gain, detecting the second control tone (30) from a portion of the light output of the laser as a fourth signal (60) which occurs only if the laser is being modulated in or below the lasing threshold region, and substantively combining the third (58) and fourth (60) signals to generate a fifth signal (84) for use as a control of the amplitude of the NRZ working signal (18).