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Circumventing the data rate bottleneck due to the bandwidth limitation of optical devices is an imperative for today&#x2019;s fiber-optic communication systems. This paper investigates a two-stage laser driver consisting of a precoder and an encoder stage, capable of applying duobinary modulation to a bandwidth-limited vertical-cavity surface-emitting laser (VCSEL). Thus, the transmitter&#x2019;s data rate capacity per cycle of bandwidth is significantly increased. By employing a cross-coupled architecture for the precoder stage, the output data rate of the driver is doubled with respect to the input data rate. Electro-optical measurements of the driver bonded to a VCSEL with inherent bandwidth of 20 GHz yielded duobinary eye diagrams at data rates up to 56 Gb/s, which represents a significant speed enhancement with regard to the laser&#x2019;s own bandwidth. To the best of the authors&#x2019; knowledge, this is the fastest integrated duobinary VCSEL driver reported so far, as well as the first chip-to-chip integration of such an electrical driver with a VCSEL device.

A High-Speed 130-nm SiGe BiCMOS Integrated Duobinary Driver for Data Rate Capacity Enhancement in VCSEL-Based Optical Links