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14 June 2004 Fully integrated CMOS VCSEL driver with nonlinearity suppression for RF optical fiber links
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Abstract
A CMOS optical fibre transmitter front-end with an analogue predistortion technique is proposed for reducing laser nonlinearity distortion to achieve broadband linearisation of radio frequency (RF) optical fibre communication systems. The technique uses a nonlinearity having the inverse transfer characteristic of the directly modulated vertical cavity surface emitting laser (VCSEL). The analogue predistortion lineariser comprises a linear and a non-linear transconductance differential amplifier. The combined linear and non-linear transconductance differential amplifiers provide the transfer characteristic to counteract the characteristic of the VCSEL laser diode. The post-layout simulation of the linearity of RF optical fibre systems using the predistortion linearisation technique shows 12dBm improvement. The integrated CMOS optical fibre transmitter circuit with the predistortion lineariser is being implemented using the austriamicrosystems (AMS) 0.35μm CMOS technology.
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Fu-Chuan Lin, Vinod A. Lalithambika, David M. Holburn, Robert J. Mears, Chak H. Hum, and Stuart D. Walker "Fully integrated CMOS VCSEL driver with nonlinearity suppression for RF optical fiber links", Proc. SPIE 5356, Optoelectronic Integrated Circuits VI, (14 June 2004); https://doi.org/10.1117/12.528368
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