Optimization of Optical Band-Pass Filters for All-Optical Wavelength Conversion Using Genetic Algorithms

Abstract

We propose using genetic algorithms to numerically optimize optical band-pass filters (OBFs) for inverted and noninverted wavelength conversion based on semiconductor optical amplifiers. A fourth order Hermite-Gaussian sum series is used to describe the filter transfer function. Signal eye openings greater than 30 dB are obtained for both inverted and noninverted output signals. The dependence of the eye opening, overshoot and pulse amplitude fluctuation on variations in the filter center frequency and bandwidth is explored. We find that for an optimized eye opening in the noninverted signal the filter should be detuned towards lower frequency with respect to the probe frequency. Finally, we show that the optimum filter transfer function obtained with the genetic algorithm can be approximated with good agreement using an asymmetric Mach-Zehnder interferometer combined with a Gaussian OBF.Index Terms-Genetic algorithms, optical band-pass filters (OBFs), semiconductor optical amplifiers (SOAs), wavelength conversion. 150 papers, invited papers, and chapters in books. His professional activities include many conferences, where he has served in technical committees, management committees, and advisory committees as a member or chairman.

Analysis of bit rate dependence up to 80Gbit/s of a simple wavelength converter based on XPM in a SOA and a shifted filtering

“…However these papers do not consider the dependence of the wavelength converted pulses for both blue and red shifting techniques on the increasing bit rate. In order to achieve high bit rate performances, the addition of an interferometer to the bandpass filter in order to optimize the filtering has also been proposed [20,21] achieving wavelength conversion up to 160 Gbit/s [22,23]. However the use of an interferometer impacts negatively the stability and the simplicity of the device.…”

Single and Multicasting Inverted-Wavelength Conversion at 80 Gb/s Based on a Single Semiconductor Optical Amplifier

“…The detailed explanation can be referred to Refs. [9,10]. The amplified spontaneous emission (ASE) spectra of the SOA with different bias currents are plotted in Fig.…”

Suppression of Nonlinear Patterning Effect in Wavelength Conversion Based on Transient Cross-Phase Modulation in Semiconductor Optical Amplifier Assisted with a Detuning Filter

“…An optimal design for the optical filter to obtain large eye opening and suppressed overshoot of output probe light has been theoretically investigated in Ref. [8] by utilizing genetic algorithm. However, the NLP partly mitigated by the optimized filter can not be eliminated without further consideration of the amplifier itself where the NLP is generated.…”