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A Second-Order Feedforward Optical Power Control Scheme for Automotive VCSEL Drivers

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4 Author(s)
Xin Yin ; INTEC/IMEC, Ghent Univ., Ghent, Belgium ; Bauwelinck, J. ; Xing-Zhi Qiu ; Vandewege, J.

This letter presents a feedforward optical power control scheme for automotive 150-Mb/s vertical-cavity surface-emitting laser (VCSEL) transmitters. The bias current exhibits a second-order dependence upon temperature, while the modulation current is provided with a piecewise linear compensation of temperature variations. The resulting VCSEL modulation performance was analyzed in detail and experimentally validated. Over the harsh automotive temperature range from -40°C to 105°C, a high extinction ratio was maintained despite very tight tolerances on pulsewidth distortion (PWD); the variation of the emitted optical power was measured to be less than 1.2 dB, while maintaining an extinction ratio better than 12 dB and a PWD less than ±2%.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 22 )

Date of Publication:

Nov.15, 2010

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