Title :
A 3.8-Gb/s CMOS Laser Driver with Automatic Power Control Using Thermistors
Author :
Li, Day-Uei ; Chen, Wen-Hui ; Chang, Long-Xi ; Yu, Chueh-Hao
Author_Institution :
SoC Technol. Center, Ind. Technol. Res. Inst., Hsinchu
Abstract :
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.
Keywords :
CMOS integrated circuits; compensation; driver circuits; jitter; power control; semiconductor lasers; thermistors; -30 to 80 C; 0.25 micron; 1310 nm; 3.8 Gbit/s; 5 to 60 mA; CMOS laser driver; automatic power control; electrical eye diagrams; laser diodes; modified MUX circuit; optical eye diagram; waveform shaping circuit; CMOS process; Driver circuits; Electric variables measurement; Jitter; Monitoring; Photodiodes; Power control; Power lasers; Temperature distribution; Thermistors;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.377834
