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Integrated transversal equalizers in high-speed fiber-optic systems

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7 Author(s)
Hui Wu ; Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA ; Tierno, J.A. ; Pepeljugoski, P. ; Schaub, J.
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Intersymbol interference (ISI) caused by intermodal dispersion in multimode fibers is the major limiting factor in the achievable data rate or transmission distance in high-speed multimode fiber-optic links for local area networks applications. Compared with optical-domain and other electrical-domain dispersion compensation methods, equalization with transversal filters based on distributed circuit techniques presents a cost-effective and low-power solution. The design of integrated distributed transversal equalizers is described in detail with focus on delay lines and gain stages. This seven-tap distributed transversal equalizer prototype has been implemented in a commercial 0.18-μm SiGe BiCMOS process for 10-Gb/s multimode fiber-optic links. A seven-tap distributed transversal equalizer reduces the ISI of a 10-Gb/s signal after 800 m of 50-μm multimode fiber from 5 to 1.38 dB, and improves the bit-error rate from about 10-5 to less than 10-12.

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Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 12 )