We characterize a silicon based wavelength converter using a commercial semiconductor amplifier b... more We characterize a silicon based wavelength converter using a commercial semiconductor amplifier based wavelength converter as a benchmark. Results show that silicon achieves -5.5 dB efficiency, offers broader conversion bandwidth, higher OSNR and negligible channel crosstalk.
We characterize silicon waveguide based wavelength converters using a commercial semiconductor op... more We characterize silicon waveguide based wavelength converters using a commercial semiconductor optical amplifier (SOA) based wavelength converter as a benchmark. Conversion efficiency as high as -5.5 dB can be achieved using a 2.5 cm long sub-micron silicon-on-insulator rib waveguide. Comparison with the SOA reveals that silicon offers broader conversion bandwidth, higher OSNR, and negligible channel crosstalk. The impact of two-photon absorption and free carrier absorption on the conversion efficiency and the dependence of the efficiency on the rib waveguide dimensions are investigated theoretically. Using a nonlinear index coefficient of 4x10(-14) cm(2)/W for silicon, we obtain good agreement between simulations and measurements.
We demonstrate dense SS-WDM uplink over legacy PONs using a novel self-seeded RSOA transmitter an... more We demonstrate dense SS-WDM uplink over legacy PONs using a novel self-seeded RSOA transmitter and a balanced receiver that preserves noise cleaning. 32 colorless ONUs can be supported at 1.25 Gb/s without DCF and FEC.
Using a silicon waveguide based optical phase conjungator, mid-span dispersion compensation has b... more Using a silicon waveguide based optical phase conjungator, mid-span dispersion compensation has been demonstrated by transmitting wavelength multiplexed 4times10 Gb/s data over 320 km standard fiber with < 0.3 dB power penalty at bit error rate of 10-9.
We report a wavelength conversion efficiency of -5.5 dB via four-wave-mixing in a low-loss 2.5 cm... more We report a wavelength conversion efficiency of -5.5 dB via four-wave-mixing in a low-loss 2.5 cm long sub-micron silicon-on-insulator rib waveguide. The impact of non-linear absorption and waveguide dimensions on the conversion efficiency is studied.
A novel state-variable dynamic model for semiconductor linear optical amplifiers (LOA) is used to... more A novel state-variable dynamic model for semiconductor linear optical amplifiers (LOA) is used to describe gain dynamics and stabilization properties of LOAs. Results from the model are verified against experiments
We experimentally compare noise reduction of incoherent spectrum-sliced light using a SOA in both... more We experimentally compare noise reduction of incoherent spectrum-sliced light using a SOA in both direct amplification and incoherent-to-coherent conversion. Results show conversion is more efficient when using fast gain recovery SOAs.
Archives Des Maladies Professionnelles Et De L Environnement, 2004
This paper reports for the first time an all-optical wavelength conversion of an incoherent optic... more This paper reports for the first time an all-optical wavelength conversion of an incoherent optical signal to a coherent optical signal using the cross-gain modulation in semiconductor optical amplifiers. Wavelength division multiplexed networks using broadband sources have performance limited by beat noise; conversion from a noncoherent to a coherent signal eliminates beat noise and enables the elimination of the bit error rate floor.
We report experimental results showing direct current modulation of a commercial semiconductor op... more We report experimental results showing direct current modulation of a commercial semiconductor optical amplifier (SOA) for electrical to optical conversion of a 64-QAM OFDM analog signal at 54 Mbit/s on 2.5 and 5 GHz carriers. This is believed to be the highest frequency yet experimentally reported for RF signal transmission using a directly modulated semiconductor optical amplifier
A novel state-variable model for semiconductor optical amplifiers (SOAs) that is amenable to bloc... more A novel state-variable model for semiconductor optical amplifiers (SOAs) that is amenable to block diagram implementation of wavelength division multiplexed (WDM) signals and fast execution times is presented. The novel model is called the reservoir model, in analogy with similar block-oriented models for Raman and erbium-doped fiber amplifiers (EDFAs). A procedure is proposed to extract the needed reservoir model parameters from the parameters of a detailed and accurate space-resolved SOA model due to Connelly, which was extended to cope with the time-resolved gain transient analysis. Several variations of the reservoir model are considered with increasing complexity, which allow the accurate inclusion of scattering losses and gain saturation induced by amplified spontaneous emission. It is shown that at comparable accuracy, the reservoir model can be 20 times faster than the Connelly model in single-channel operation; much more significant time savings are expected for WDM operation. The model neglects intraband SOA phenomena and is thus limited to modulation rates per channel not exceeding 10 Gb/s. The SOA reservoir model provides a unique tool with reasonably short computation times for a reliable analysis of gain transients in WDM optical networks with complex topologies
We characterize a silicon based wavelength converter using a commercial semiconductor amplifier b... more We characterize a silicon based wavelength converter using a commercial semiconductor amplifier based wavelength converter as a benchmark. Results show that silicon achieves -5.5 dB efficiency, offers broader conversion bandwidth, higher OSNR and negligible channel crosstalk.
We characterize silicon waveguide based wavelength converters using a commercial semiconductor op... more We characterize silicon waveguide based wavelength converters using a commercial semiconductor optical amplifier (SOA) based wavelength converter as a benchmark. Conversion efficiency as high as -5.5 dB can be achieved using a 2.5 cm long sub-micron silicon-on-insulator rib waveguide. Comparison with the SOA reveals that silicon offers broader conversion bandwidth, higher OSNR, and negligible channel crosstalk. The impact of two-photon absorption and free carrier absorption on the conversion efficiency and the dependence of the efficiency on the rib waveguide dimensions are investigated theoretically. Using a nonlinear index coefficient of 4x10(-14) cm(2)/W for silicon, we obtain good agreement between simulations and measurements.
We demonstrate dense SS-WDM uplink over legacy PONs using a novel self-seeded RSOA transmitter an... more We demonstrate dense SS-WDM uplink over legacy PONs using a novel self-seeded RSOA transmitter and a balanced receiver that preserves noise cleaning. 32 colorless ONUs can be supported at 1.25 Gb/s without DCF and FEC.
Using a silicon waveguide based optical phase conjungator, mid-span dispersion compensation has b... more Using a silicon waveguide based optical phase conjungator, mid-span dispersion compensation has been demonstrated by transmitting wavelength multiplexed 4times10 Gb/s data over 320 km standard fiber with < 0.3 dB power penalty at bit error rate of 10-9.
We report a wavelength conversion efficiency of -5.5 dB via four-wave-mixing in a low-loss 2.5 cm... more We report a wavelength conversion efficiency of -5.5 dB via four-wave-mixing in a low-loss 2.5 cm long sub-micron silicon-on-insulator rib waveguide. The impact of non-linear absorption and waveguide dimensions on the conversion efficiency is studied.
A novel state-variable dynamic model for semiconductor linear optical amplifiers (LOA) is used to... more A novel state-variable dynamic model for semiconductor linear optical amplifiers (LOA) is used to describe gain dynamics and stabilization properties of LOAs. Results from the model are verified against experiments
We experimentally compare noise reduction of incoherent spectrum-sliced light using a SOA in both... more We experimentally compare noise reduction of incoherent spectrum-sliced light using a SOA in both direct amplification and incoherent-to-coherent conversion. Results show conversion is more efficient when using fast gain recovery SOAs.
Archives Des Maladies Professionnelles Et De L Environnement, 2004
This paper reports for the first time an all-optical wavelength conversion of an incoherent optic... more This paper reports for the first time an all-optical wavelength conversion of an incoherent optical signal to a coherent optical signal using the cross-gain modulation in semiconductor optical amplifiers. Wavelength division multiplexed networks using broadband sources have performance limited by beat noise; conversion from a noncoherent to a coherent signal eliminates beat noise and enables the elimination of the bit error rate floor.
We report experimental results showing direct current modulation of a commercial semiconductor op... more We report experimental results showing direct current modulation of a commercial semiconductor optical amplifier (SOA) for electrical to optical conversion of a 64-QAM OFDM analog signal at 54 Mbit/s on 2.5 and 5 GHz carriers. This is believed to be the highest frequency yet experimentally reported for RF signal transmission using a directly modulated semiconductor optical amplifier
A novel state-variable model for semiconductor optical amplifiers (SOAs) that is amenable to bloc... more A novel state-variable model for semiconductor optical amplifiers (SOAs) that is amenable to block diagram implementation of wavelength division multiplexed (WDM) signals and fast execution times is presented. The novel model is called the reservoir model, in analogy with similar block-oriented models for Raman and erbium-doped fiber amplifiers (EDFAs). A procedure is proposed to extract the needed reservoir model parameters from the parameters of a detailed and accurate space-resolved SOA model due to Connelly, which was extended to cope with the time-resolved gain transient analysis. Several variations of the reservoir model are considered with increasing complexity, which allow the accurate inclusion of scattering losses and gain saturation induced by amplified spontaneous emission. It is shown that at comparable accuracy, the reservoir model can be 20 times faster than the Connelly model in single-channel operation; much more significant time savings are expected for WDM operation. The model neglects intraband SOA phenomena and is thus limited to modulation rates per channel not exceeding 10 Gb/s. The SOA reservoir model provides a unique tool with reasonably short computation times for a reliable analysis of gain transients in WDM optical networks with complex topologies
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Papers by Walid Mathlouthi