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—In this paper, we present integrated circuit solutions that enable high-speed data transmission over legacy systems such as short reach optics and electrical backplanes. These circuits compensate for the most critical signal impairments, intersymbol interference and crosstalk. The finite impulse response (FIR) filter is the cornerstone of our architecture,… (More)
We demonstrate near-transform-limited pulse generation through spectral compression arising from nonlinear propagation of negatively chirped pulses in optical fiber. The output pulse intensity and phase were quantified by use of second-harmonic generation frequency-resolved optical gating. Spectral compression from 8.4 to 2.4 nm was obtained. Furthermore,… (More)
We report significant improvement in terahertz (THz) power and efficiency using photoconductive sources by use of a spatially extended line source excitation and the trap enhanced field effect that occurs in sources made on semi-insulating GaAs. The combination of high electric fields and reduced screening effects allows 10 microW of THz power to be… (More)
Ultra-high-speed optical communication systems which can support ≥ 1Tb/s per channel transmission will soon be required to meet the increasing capacity demand. However, 1Tb/s over a single carrier requires either or both a high-level modulation format (i.e. 1024QAM) and a high baud rate. Alternatively, grouping a number of tightly spaced "sub-carriers" to… (More)
This is dedicated to my family and everyone else who helped me along my way just so they could see me succeed. This is also dedicated to the innocent students and faculty who lost their lives at Virginia Tech on April 16, 2007 doing what I am doing now: pursuing a higher education. iv ACKNOWLEDGEMENTS I would like to thank Dr. Ali Adibi for being my… (More)
We propose a new passive optical thresholding device that combines the principles of multimode interference (MMI) with self-guiding. The multimode region is composed of a nonlinear optical material that will support a self-guided beam (i.e., a material with a positive Kerr nonlinearity). The device operates by switching between the MMI mode of operation and… (More)
We report the direct measurement of the intrinsic photocurrent response of both top and back illuminated planar metal–semiconductor–metal structures. We directly observe the temporal dynamics of the hole transport dependence on applied bias and the initial spatial distribution using a near infrared tunable femtosecond light source and electrically biased… (More)
Penalties from in-band crosstalk for 112 Gb/s PolMux-QPSK systems are shown to be readily determined by use of a spectrally weighted crosstalk. Experimental results demonstrate that the method is robust for linear and nonlinear regimes.
We report the first statistical evaluation of the calculated effective modal bandwidth and 10Gb/s ISI penalty of graded-index perfluorinated plastic optical fiber under VCSEL illumination, utilizing high temporal-resolution differential modal delay measurements.