A. Marculescu

Simple all-optical FFT scheme enabling Tbit/s real-time signal processing

A practical scheme to perform the fast Fourier transform in the optical domain is introduced. Optical real-time FFT signal processing is performed at speeds far beyond the limits of electronic digital processing, and with negligible energy consumption. To illustrate the power of the method we demonstrate an optical 400 Gbit/s OFDM receiver. It performs an optical real-time FFT on the consolidated OFDM data stream, thereby demultiplexing the signal into lower bit rate subcarrier tributaries, which can then be processed electronically.

Single source optical OFDM transmitter and optical FFT receiver demonstrated at line rates of 5.4 and 10.8 Tbit/s

OFDM data with line rates of 5.4 Tbit/s or 10.8 Tbit/s are generated and decoded with a new real-time all-optical FFT receiver. Each of 75 carriers of a comb source is encoded with 18 GBd QPSK or 16-QAM.

Cascadability and Regenerative Properties of SOA All-Optical DPSK Wavelength Converters

A novel all-optical differential phase-shift keying wavelength converter based on semiconductor optical amplifier nonlinearities is demonstrated in the 25- to 40-Gb/s range with pseudorandom binary sequence of 27-1, and its regenerative properties as well as the cascadability are discussed

Pattern Effect Removal Technique for Semiconductor-Optical-Amplifier-Based Wavelength Conversion

A technique to overcome pattern dependence in semiconductor-optical-amplifier-based wavelength converters is presented. The technique is based on a careful selection of red- and blue-shifted spectral components having complementary pattern effects in the output spectrum of a wavelength-converted signal. Significant signal quality improvements are reported at a bit rate of 40 Gb/s.

Filter Assisted Wavelength Conversion With Quantum-Dot SOAs

The nonlinear operation regimes of quantum-dot semiconductor optical amplifiers (QD-SOAs) are investigated and the ideal filter providing the best all-optical wavelength conversion efficiency is derived theoretically. Results are confirmed by experiments with Q2-factors amounting to 16 dB.

All-optical DPSK wavelength converter based on MZI with integrated SOAs and phase shifters

An integrated MZI-SOA device is developed for all-optical wavelength conversion of DPSK signals. The functionality is investigated close to 40 Gb/s and error free operation with less then 1 dB penalty is demonstrated.

Dual output SOA based amplifier for PON extenders

A novel two-output PON amplifier is demonstrated to provide over 8-dB output power budget improvement over a conventional SOA, with negligible ASE noise. With an additional preamplifier it can accommodate up to 30 dB burst-to-burst power variation.

Novel optical fast fourier transform scheme enabling real-time OFDM processing at 392 Gbit/s and beyond

An optical FFT scheme is implemented and tested at 392 Gbit/s. It enables OFDM signal processing way beyond the bandwidth limits of electronics. The scheme operates with little energy as it exploits passive optical components.

New Approaches to Perform All-Optical Signal Regeneration

Insights into nonlinear material properties of bulk semiconductor optical amplifiers (SOAs) and novel quantum-dot (QD) SOA nonlinear materials have led to novel device configuration for all-optical wavelength conversion and signal regeneration. The paper will review latest developments and discuss novel configurations.

Optimum filter for wavelength conversion with QD-SOA

High-quality all-optical wavelength conversion is demonstrated with a single QD-SOA followed by a filter. The operation regimes of QD-SOA are identified. It is shown that different filter schemes are needed for the respective regimes.