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State-of-the-art RF front-end circuits are typically designed to operate at a single frequency. With an increasing number of available wireless standards, personal mobile communication devices require...
Power amplifiers (PAs) convert energy from DC to high frequencies in all radio and microwave transmitter systems be they wireless base stations, handsets, radars, heaters, and so on. PAs are the domin...
This thesis presents the design, layout, and measurements of a bi-directional amplifier with variable vector (in-phase / quadrature) gain control that will be part of an electronically steered phased ...
We have developed a novel optical fiber ring laser using a semiconductor optical amplifier (SOA) as the gain medium, and taking advantage of polarization anisotropy of its gain. The frequency differen...
Differential cross-polarization modulation (DXPoM) wavelength conversion using a semiconductor optical amplifier has been proposed to outperform substantially traditional cross-polarization modulation...
A multiwavelength fiber ring laser that is based on an S-band erbium-doped fiber amplifier (EDFA) and a semiconductor optical amplifier (SOA) is developed. An optical switch is used to switch the mult...
This investigation experimentally demonstrates a 40 GHz phase shifter based on a semiconductor laser. The phase shift is achieved by adjusting the bias current and wavelength detuning. The device has ...
We demonstrated a semiconductor optical amplifier hybrid-integrated with a silica-based planar lightwave circuits. With deploying polarization diversity circuit, polarization dependent gain was reduce...
We present a phase locking scheme that enables the demonstration of the first black-box dual pump degenerate phase sensitive amplifier for 10 Gbit/s NRZ-ASK signals.
We propose and demonstrate the use of a PSA as a modulation signal enhancer for the first time. It can generate both phase- and amplitude modulated signals from low-extinction inputs.
We investigate the feasibility of optical gain-clamping a fiber-optic parametric-amplifier to prevent cross gain saturation in multi-channel systems. We measure only moderate improvement but identify ...
We investigate the feasibility of optical gain-clamping a fiber-optic parametric-amplifier to prevent cross gain saturation in multi-channel systems. We measure only moderate improvement but identify ...
We introduce a novel input-idler-free non-degenerate phase sensitive amplifier (PSA) configuration and use it for simultaneous phase and amplitude regeneration of quadrature phase shift keyed (QPSK) s...
We present a monolithic all-fiber, counter-propagating pumped, single-frequency amplifier with an output power of 47 W.

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