Title :
40-Gb/s Widely Tunable Low-Drive-Voltage Electroabsorption-Modulated Transmitters
Author :
Raring, James W. ; Johansson, Leif A. ; Skogen, Erik J. ; Sysak, Matthew N. ; Poulsen, Henrik N. ; DenBaars, Steven P. ; Coldren, Larry A.
Author_Institution :
Electr. & Comput. Eng. Dept., California Univ., Santa Barbara, CA
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 VPtoP), 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
Keywords :
chirp modulation; diffraction gratings; distributed Bragg reflector lasers; electro-optical modulation; electroabsorption; error statistics; integrated optics; laser tuning; optical fibre communication; optical transmitters; quantum well lasers; wavelength division multiplexing; 2.3 km; 35 mW; 35 to 39 GHz; 40 Gbit/s; axial waveguide; bit-error rate measurements; blanket regrowth; electroabsorption modulator; electroabsorption-modulated transmitters; laser tuning; low-chirp operation; low-drive-voltage transmitters; multiple-band-edge-quantum-well-intermixing; negative-chirp operation; optical modulation; power penalty; quantum well active-region designs; sampled-grating distributed Bragg reflector laser; standard fiber transmission; wavelength division multiplexing; widely tunable transmitters; Distributed Bragg reflectors; Laser tuning; Optical transmitters; Optical tuning; Optical waveguides; Power lasers; Quantum well devices; Quantum well lasers; Tunable circuits and devices; Waveguide lasers; Chirp; electroabsorption modulators (EAMs); laser tuning; optical-fiber communication; quantum-well-intermixing (QWI); s emiconductor lasers; wavelength-division multiplexing (WDM);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2006.886722
