A 3.8-Gb/s CMOS laser driver with automatic power control using thermistors

Day-Uei Li, Wen-Hui Chen, Long-Xi Chang, Chueh-Hao Yu

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)


A 3.8-Gb/s laser driver with automatic power control (APC) using thermistors is presented. The chip was fabricated in 0.25mum 1P5M CMOS process. With a waveform shaping circuit, the driver could generate a 5mA to 60mA modulation current with its duty cycle maintained at 50%. A modified MUX circuit is also introduced to improve the jitter performance of both the direct and latched data output. And with a thermistor-APC compensation circuit, the laser power could be maintained within a temperature range from -30 degC to 80degC without using any monitor photodiode. Measurements on mounted chips show clear electrical eye diagrams operating over 3.8-Gb/s data rate with typical rise/fall times (20% to 80%) of 104/109ps. Moreover, an optical eye diagram is also demonstrated by connecting the driver with a 2.5-Gb/s 1310nm laser diode.
Original languageEnglish
Title of host publicationIEEE International Symposium on Circuits and Systems (ISCAS), 2007
Number of pages4
ISBN (Print)1424409209
Publication statusPublished - 25 Jun 2007

Publication series

ISSN (Print)0271-4302
ISSN (Electronic)2158-1525


  • power lasers
  • thermistors
  • driver circuits
  • CMOS process
  • jitter

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