Christos Stamatiadis

Optical Static RAM Cell

We demonstrate an optical static random access memory cell that provides read and write functionality at 5 Gb/s. The circuit comprises a hybridly integrated semiconductor optical amplifier-Mach-Zehnder interferometer (SOA-MZI) flip-flop serving as the memory unit and two additional SOA-based cross-gain modulation switches for controlling access to the memory cell.

First monolithic GaAs IQ electro-optic modulator, demonstrated at 150 Gbit/s with 64-QAM

We report on the first experimental demonstration of a GaAs IQ-modulator. Data rates of up to 150 Gbit/s are generated using QPSK, 16-QAM, 32-QAM and 64-QAM on a single carrier and polarization.

Silicon-on-Insulator Nanowire Resonators for Compact and Ultra-High Speed All-Optical Wavelength Converters

We present the development of application-specific silicon-on-insulator SOI nanowire ring and racetrack resonators designed to assist semiconductor optical amplifier (SOA)-based all-optical wavelength conversion. We demonstrate the fabrication of fix resonance racetrack resonators exhibiting coupling gaps as low as 160 nm and tunable ring resonators with coupling gaps <; 90 nm. The resonators are cascaded after commercial 40 Gb/s SOAs to realize chirp filtering of the optical data signals through high-resolution spectral sampling. We experimentally demonstrate inverted and non-inverted SOI resonator-assisted all-optical wavelength conversion at 40 Gb/s and 160 Gb/s with power penalties <; 3 dB.

Microring-Resonator-Assisted, All-Optical Wavelength Conversion Using a Single SOA and a Second-Order Si

We present the first microring-resonator-assisted wavelength converter employing a semiconductor optical amplifier and a tunable, Si3N4-SiO2 microring-resonator-reconfigurable optical add-drop multiplexer. We demonstrate inverted, noninverted, and wavelength-division-multiplexing-enabled wavelength conversion with low power penalties.

_{3}

We present the RAWC, the first Ring Resonator Assisted Wavelength Converter employing a SOA and a tunable, Si<inf>3</inf>N<inf>4</inf>-SiO<inf>2</inf> micro-ring resonator ROADM. We demonstrate inverted, non-inverted and WDM-enabled wavelength conversion with low power penalties.

N

We develop a method for the repetition rate multiplication by a factor of 2 n of pseudorandom bit sequences (PRBSs). It makes recursive use of an optical or-gate in feedback and ensures that the complexity of the resulting circuit is independent of the multiplication factor or the PRBS order to be rate multiplied. We employ an all-optical circuit comprising of two nonlinear fiber Sagnac interferometers and show error-free quadrupling of 12.5-Gb/s PRBSs to 50 Gb/s.

_{4}

We investigate the use of 4-pulsed amplitude modulation (PAM) in reflective semiconductor optical amplifier (RSOA)-based PON implementations. The performance of low-bandwidth RSOAs can be significantly upgraded using 4-PAM together with pre-equalization. We demonstrate 4-PAM external modulation up to 8 Gb/s using a RSOA with a 3-dB bandwidth of 1.2-GHz and 10-km 4-PAM transmission at 8 Gb/s with bit-error-rate below the forward-error-correction (FEC) limit. In the full-duplex 4-PAM transmission, 10-km symmetric performance up to 4 Gb/s is experimentally demonstrated using a downstream signal with strong DC offset for data cancellation and upstream remodulation.

–SiO

We present a new forwarding-gate scheme using a single SOA-MZI. We show a bi-stable behavior with a 13.6 dB extinction-ratio and rise and fall times below 30ps. Error-free operation is achieved at 40 Gb/s.

_{2}

High-precision hybrid integration on SOI photonic circuit was developed. The technology was applied to fabricate an integrated high-speed all-optical wavelength converter. Potential of the platform was demonstrated by 40Gb/s all-optical wavelength switching.

ROADM

Experimental and numerical results of an integrated optical fiber grating coupler on SOI capable of exciting LP₀₁, LP_{11, a} and LP_{11, b} modes in a standard few mode fiber in both TE and TM polarization are presented.