We present an experimental demonstration of an all optical memory consisting of a single semiconductor optical amplifier as the active medium based on wave mixing. The circuit is a fiber ring consisting of a semiconductor amplifier, a bi-directional 2x2 fiber coupler, an isolator, a polarization controller, and a Faraday mirror. The output is observed on the spectrum analyzer, which consists of the peak wavelength of the SOA plus an additional signal generated through wave mixing, which is tunable within the band gap of the SOA. We shall demonstrate two modes of operation of the device, which will consist of a flip flop switch between three states, as well as a single data storage memory. The stable states consist of two modes, where the mode amplitude represents the state. Mode 1 corresponds to 1500 nanometers and mode 2 corresponds to 1530 nanometers. A contrast ratio between an “on” and “off” state is measured for each mode and the mode of operation is based on the polarization. We shall present the states for the circuit, the effect of drive current on the system, the effect of the SOA structure, wave mixing effects, and how to operate the device for both logic operation and data storage.
We present experimental demonstration of passively modelocked laser with pulse-repetition
frequency tunable using semiconductor optical amplifier as the gain medium. The principle
of operation is based on normal mode competition of a coupled cavity comprised of a
quantum cavity and an optical cavity represented by a semiconductor gain medium, and a
high-birefringence fiber in line with a Faraday mirror respectively. Experimental results are
presented for pulse-repetition frequency shows stable tunability over a frequency decade of
93MHz and 1400MHz.
We present an experimental demonstration of an all optical memory consisting of a coupled system of a semiconductor
optical amplifier and a super continuum generator operating in the 1500 nm range. The circuit is designed as a fiber
ring consisting of the semiconductor amplifier, a polarization beam splitter, a digital polarization controller, a
polarization maintaining fiber and a super continuum generator in series. The P or the S output of the beam splitter is
sent to an optical spectrum analyzer to measure the output while the other output completes the ring. The linear
polarization is adjusted with a digital polarization controller. The stable state consists of two modes, where the mode
amplitude represents the state. Mode 1 corresponds to 1530 nanometers and mode 2 corresponds to 1550 nanometers. A
contrast ratio between an "on" and "off" state is measured for each mode. The stable states of the flip flop are [mode1-
ON, mode2- ON], [mode 1-ON, mode 2-OFF], [mode1-OFF, mode 2-ON] and [mode 1-OFF, mode 2-OFF] and are
controlled by the polarization. We shall present the state diagram for these four states of the flip flop, the effect of
power on the system, the effect of the SOA drive current, and the effect of polarization fluctuations.