Matthew B Abrams

US Patent:

6947456, Sep 20, 2005

Filed:

Dec 12, 2000

Appl. No.:

09/735315

Inventors:

Jesse Chin - Hillsborough CA, US
Miaobin Gao - San Jose CA, US
Robert Elsheimer - San Jose CA, US
Matthew Scott Abrams - Santa Clara CA, US
Heng-ju Cheng - Mountain View CA, US
Takashi Hidai - Palo Alto CA, US
Myunghee Lee - San Jose CA, US
Song Liu - San Jose CA, US

Assignee:

Agilent Technologies, Inc. - Palo Alto CA

International Classification:

H01S003/00
H01S003/30
H01S003/13

US Classification:

372 3802, 372 8, 372 381, 372 3801, 372 3808, 372 2901

Abstract:

A laser driver for generating drive waveforms that are suitable for driving a single VCSEL or an array of VCSELs. A digital controller is integrated into the laser driver and is utilized to initially program and selectively adjust during the operation of the driver one or more of the following VCSEL drive waveform parameters: (1) bias current, (2) modulation current, (3) negative peaking depth, and (4) negative peaking duration. The laser driver has an aging compensation mechanism for monitoring the age of the laser and for selectively adjusting the dc and ac parameters of the VCSEL drive waveform to compensate for the aging of the laser. The laser driver also has a temperature compensation mechanism for monitoring the temperature of the driver IC and selectively adjusting the dc and ac parameters of the VCSEL drive waveform to compensate for the changes in temperature.