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We demonstrate ultra fast tuning of the optical quality factor of a resonator on a silicon chip using electro-optic tuning. We tune the cavity quality factor from 20,000 to 6,000 in 100 ps.
Analytical models for bandwidth and bandwidth-efficiency product (BEP) of microring waveguide photodetectors (MRWPDs) are presented. In addition to carrier transport and charging processes, the photon lifetime effect is included in the bandwidth model. This effect is characterized by the ODB of microring resonators. It is shown that the short cavities and partially overcoupled structures are suitable...
A high-speed silicon optical modulator based on the free carrier plasma dispersion effect is presented. It is based on carrier depletion of a pn diode embedded inside a silicon-on-insulator waveguide. To achieve high-speed performance, a travelling-wave design is used to allow co-propagation of the electrical and optical signals along the length of the device. The resulting modulator has a 3 dB bandwidth...
A low-loss silicon photonic wire waveguide with low-impedance p-i-n carrier injection structures was developed. The propagation loss of the waveguide was less than 2 dB/cm and the input-impedance was adjustable around a few ten ohms. In a compact variable optical attenuator using this waveguide, the power consumption giving 30-dB attenuation was about 55 mW, and the response time was about 2 ns. A...
The two-photon absorption (TPA), the free-carrier absorption (FCA), and the carrier plasma effect play important roles in Si-based photonic devices. These effects have been incorporated directly into a finite-difference time-domain (FDTD) simulator for the first time. To check the validity of the FDTD simulator, it has been applied to the simulation of nonlinear transmission of an ultrashort optical...
The extremely strong crystalline-Si optical nonlinearity allows a wide variety of fs-pulse propagation effects to be readily seen at low input powers on Si chips. This talk presents a theoretical and experimental investigation using ultrasmall, Si-wire waveguides
The optical properties of photonic crystals can be altered most rapidly if a refractive index is altered using ultrashort optical pulses. I review several experiments in which we have used the Kerr effect or the Drude effect to switch optical properties of 2-D silicon photonic or GaAs photonic crystals on a picosecond or subpicosecond time scale. Tuning of the optical properties of a photonic crystal...
We experimentally observed the self-distortion of picosecond pulses propagating in silicon wire waveguides. The asymmetry of output pulse shape was due to two-photon absorption generated free carriers within the pulse duration.
We present the first full theoretical study of femtosecond pulse propagation in silicon wires. Dispersion effects up to the third order, Kerr nonlinearity, intrinsic losses, free carrier and two-photon absorption effects are included.
We demonstrate for the first time an all-optical logic NOR gate in submicron size silicon wire waveguides. High speed operation at equivalent 80 Gbps data rate was achieved using pump induced non-degenerate two-photon absorption inside the waveguides. The device requires low pulse energy (few pJ) for logic gate operation
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