Abstract

Highly integrated electronic driver and receiver ICs with low-power consumption are essential for the development of cost-effective multichannel fiber-optic transceivers with small form factor. This paper presents the latest results of a two-channel 28 Gb/s driver array for optical duobinary modulation and a four-channel 25 Gb/s TIA array suited for both NRZ and optical duobinary detection. This paper demonstrated that 28 Gb/s duobinary signals can be efficiently generated on chip with a delay-and-add digital filter and that the driver power consumption can be significantly reduced by optimizing the drive impedance well above 50 ${\Omega }$ , without degrading the signal quality. To the best of our knowledge, this is the fastest modulator driver with on-chip duobinary encoding and precoding, consuming only 652 mW per channel at a differential output swing of 6 Vpp. The 4 $\times$ 25 Gb/s TIA shows a good sensitivity of −10.3 dBm average optical input power at 25 Gb/s for PRBS $2^{31}\hbox{-1}$ and low power consumption of 77 mW per channel. Both ICs were developed in a 130 nm SiGe BiCMOS process.

© 2014 IEEE

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