Abstract
We present the first 40-Gb/s widely tunable electroabsorption modulator (EAM)-based transmitters. The
sampled-grating Distributed Bragg Reflector (SG-DBR) laser/EAM devices were fabricated using a
multiple-band-edge-quantum-well-intermixing (QWI) technique, which requires only simple blanket regrowth and avoids
disruption of the axial waveguide. Devices were fabricated from two different multiple quantum well (MQW)
active-region designs for direct comparison. The SG-DBR lasers demonstrated 30 nm of tuning with output powers up to
35 mW. The integrated QW EAMs provided 3-dB optical modulation bandwidths in the 35–39 GHz range, low-drive
voltage (1.0–1.5 V<sub>PtoP</sub>), and
low/negative-chirp operation. Bit-error-rate measurements at 40 Gb/s demonstrated 0.2–1.1 dB of power penalty
for transmission through 2.3 km of standard fiber.
© 2007 IEEE
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