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. 08, 2005
Filed:
Oct. 30, 2002
Darin James Douma, Monrovia, CA (US);
James Walter Stewart, San Jose, CA (US);
Rudy Hofmeister, Sunnyvale, CA (US);
Anthony W. Ho, Sunnyvale, CA (US);
Lucy G. Hosking, Santa Cruz, CA (US);
Darin James Douma, Monrovia, CA (US);
James Walter Stewart, San Jose, CA (US);
Rudy Hofmeister, Sunnyvale, CA (US);
Anthony W. Ho, Sunnyvale, CA (US);
Lucy G. Hosking, Santa Cruz, CA (US);
Finisar Corporation, Sunnyvale, CA (US);
Abstract
The method and apparatus for compensating a photo-detector allows both regulation and monitoring of the photo-detector to be performed with a common digital controller. The controller accepts input of monitored operational parameters including received signal strength and temperature. The controller provides as an output a bias control signal which regulates a positive the positive or negative side bias voltage power supply for the photo-detector. The controller maintains the bias voltage to the photo-detector at levels which optimize the gain and signal-to-noise ratios for the photo-detector thereby facilitating the decoding of the received signal over a broad range of signal strengths and temperatures. The controller includes a corresponding digital signal strength and temperature compensators the outputs of which summed with a summer to provide the bias control signal. The digital signal strength compensator also provides as an output a monitor signal a level of which corresponds to the actual signal strength received by the photo-detector after compensation for the variable gain of the photo-detector resulting from the bias voltage level. A transceiver as well as methods and means for monitoring a photo-detector are also disclosed.