The wavelength conversion of 4-ary quadrature amplitude modulation (4-QAM) optical carriers is ac... more The wavelength conversion of 4-ary quadrature amplitude modulation (4-QAM) optical carriers is achieved for small input powers (< −15 dBm) and symbol rates of 32 GBd using a highly nonlinear semiconductor optical amplifier (SOA). The degenerated four-wave mixing (FWM) phenomena was used in order to avoid secondary FWM products and gain saturation. With optimized input powers and wavelengths to achieve maximum FWM efficiency, error-free operation was achieved with negligible penalties employing conventional digital signal processing (DSP) algorithms for signal recovering, demodulation, and analysis.
Abstract A technique to characterize amplitude distortions and optical carrier frequency variatio... more Abstract A technique to characterize amplitude distortions and optical carrier frequency variations (chirp) using optical heterodyne reception and data post-processing is presented. Predominantly, dynamic performances of electro-optical switching action based on semiconductor optical amplifiers (SOA) are analyzed, through the measuring of the SOA chirp imposed on the switched optical carrier. The employment of nearly linear SOAs is preferable in comparison with its nonlinear counterparts since the slower operational state transitions are compensated by narrower guard times and less drastic transient behaviors. At its best operational condition, the most linear SOA achieved chirp oscillations below 0 . 4 GHz . Its short transient behavior indicates the possibility to achieve optical package switching with low latency and low amplitude and frequency distortions.
2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2015
Numerical results for distortion and further regeneration of optical 32QAM by SOAs are presented.... more Numerical results for distortion and further regeneration of optical 32QAM by SOAs are presented. The distortions caused by the first SOA were reduced by a second device acting as a saturable absorber. EVM is reduced from 36% to 16% for 10 Gbaud, and from 24% to 12% for 20 Gbaud (Pin = -10.5 dBm). It is demonstrated that the two SOAs, if properly operated, can work as a quasi-linear amplifier and so be eligible to be used in middle range links employing multilevel and/or phase encoded optical signal.
Latin America Optics and Photonics Conference, 2014
Ultra-fast electro-optical amplified space switching below 150 ps using semiconductor optical amp... more Ultra-fast electro-optical amplified space switching below 150 ps using semiconductor optical amplifiers are achieved using pre-emphasis techniques. In addition, multi-gigabit/s optical carrier-reuse techniques based on deep saturated ultra-long semiconductor optical amplifiers are presented.
Impedance measurements of an encapsulated semiconductor optical amplifier (SOA) were used to obta... more Impedance measurements of an encapsulated semiconductor optical amplifier (SOA) were used to obtain the SOA equivalent circuit parameters. The effect of decreasing the packaging inductances and stray capacitances are then analyzed aiming the SOA enhancement as a high-speed electro-optical switch.
2006 Ieee Mtt-S International Microwave Symposium Digest, Vols 1-5, 2006
ABSTRACT A fast electro-optical amplified switch with high contrast and large bandwidth based on ... more ABSTRACT A fast electro-optical amplified switch with high contrast and large bandwidth based on semiconductor optical amplifiers has been developed. The switch is driven by a microwave resistive combiner and voltage to current converter that is capable of generating a fast current formatted pulse from the addition of tree pulse generators voltage signals. The formatted pulse contains a fast impulse whose time position, width and amplitude can be optimized in order to enhance the switching time and the optical output gain excursion. The experimental electro-optical off-on switching time is 650 ps and the on-off is 450 ps, with an optical gain variation from -8 dB to 18 dB over all operating wavelengths. Simulation results are also presented, with good correspondence to practice
2007 Sbmo/ieee Mtt-S International Microwave and Optoelectronics Conference, Vols 1 and 2, 2007
ABSTRACT A time resolved chirp measurement technique is introduced to measure optical carrier fre... more ABSTRACT A time resolved chirp measurement technique is introduced to measure optical carrier frequency fluctuations during the sub-nanosecond off-on and on-off transition of electro- optical switches based on semiconductor optical amplifiers. A periodic injected current signal was used for the switching action and a high performance optical bandpass filter for frequency discrimination. The results show a chirp peak of 3 GHz for injected current excursion of 80 mA.
Latin America Optics and Photonics Conference, 2010
Page 1. Periodic Time-Components in Spontaneous Ultra-Weak Photon Emission of Wheat Seedlings in ... more Page 1. Periodic Time-Components in Spontaneous Ultra-Weak Photon Emission of Wheat Seedlings in Stressing Solutions Bertonha E.1,2,3, Moraes TA1, Conforti E.2 and Gallep CM1 1Faculty of Technology, 2Faculty of Electrical ...
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
We have designed and implemented an UWPE (ultra-weak photon emission) measurement system — a dark... more We have designed and implemented an UWPE (ultra-weak photon emission) measurement system — a dark chamber and low dark count PMT module — oriented to environmental control studies. The system is totally controlled by software — power supply, counting board, temperature control and shutter for light excitation. The system&amp;amp;#39;s architecture and performance are described here. In terms of SNR the
The wavelength conversion of 4-ary quadrature amplitude modulation (4-QAM) optical carriers is ac... more The wavelength conversion of 4-ary quadrature amplitude modulation (4-QAM) optical carriers is achieved for small input powers (< −15 dBm) and symbol rates of 32 GBd using a highly nonlinear semiconductor optical amplifier (SOA). The degenerated four-wave mixing (FWM) phenomena was used in order to avoid secondary FWM products and gain saturation. With optimized input powers and wavelengths to achieve maximum FWM efficiency, error-free operation was achieved with negligible penalties employing conventional digital signal processing (DSP) algorithms for signal recovering, demodulation, and analysis.
Abstract A technique to characterize amplitude distortions and optical carrier frequency variatio... more Abstract A technique to characterize amplitude distortions and optical carrier frequency variations (chirp) using optical heterodyne reception and data post-processing is presented. Predominantly, dynamic performances of electro-optical switching action based on semiconductor optical amplifiers (SOA) are analyzed, through the measuring of the SOA chirp imposed on the switched optical carrier. The employment of nearly linear SOAs is preferable in comparison with its nonlinear counterparts since the slower operational state transitions are compensated by narrower guard times and less drastic transient behaviors. At its best operational condition, the most linear SOA achieved chirp oscillations below 0 . 4 GHz . Its short transient behavior indicates the possibility to achieve optical package switching with low latency and low amplitude and frequency distortions.
2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2015
Numerical results for distortion and further regeneration of optical 32QAM by SOAs are presented.... more Numerical results for distortion and further regeneration of optical 32QAM by SOAs are presented. The distortions caused by the first SOA were reduced by a second device acting as a saturable absorber. EVM is reduced from 36% to 16% for 10 Gbaud, and from 24% to 12% for 20 Gbaud (Pin = -10.5 dBm). It is demonstrated that the two SOAs, if properly operated, can work as a quasi-linear amplifier and so be eligible to be used in middle range links employing multilevel and/or phase encoded optical signal.
Latin America Optics and Photonics Conference, 2014
Ultra-fast electro-optical amplified space switching below 150 ps using semiconductor optical amp... more Ultra-fast electro-optical amplified space switching below 150 ps using semiconductor optical amplifiers are achieved using pre-emphasis techniques. In addition, multi-gigabit/s optical carrier-reuse techniques based on deep saturated ultra-long semiconductor optical amplifiers are presented.
Impedance measurements of an encapsulated semiconductor optical amplifier (SOA) were used to obta... more Impedance measurements of an encapsulated semiconductor optical amplifier (SOA) were used to obtain the SOA equivalent circuit parameters. The effect of decreasing the packaging inductances and stray capacitances are then analyzed aiming the SOA enhancement as a high-speed electro-optical switch.
2006 Ieee Mtt-S International Microwave Symposium Digest, Vols 1-5, 2006
ABSTRACT A fast electro-optical amplified switch with high contrast and large bandwidth based on ... more ABSTRACT A fast electro-optical amplified switch with high contrast and large bandwidth based on semiconductor optical amplifiers has been developed. The switch is driven by a microwave resistive combiner and voltage to current converter that is capable of generating a fast current formatted pulse from the addition of tree pulse generators voltage signals. The formatted pulse contains a fast impulse whose time position, width and amplitude can be optimized in order to enhance the switching time and the optical output gain excursion. The experimental electro-optical off-on switching time is 650 ps and the on-off is 450 ps, with an optical gain variation from -8 dB to 18 dB over all operating wavelengths. Simulation results are also presented, with good correspondence to practice
2007 Sbmo/ieee Mtt-S International Microwave and Optoelectronics Conference, Vols 1 and 2, 2007
ABSTRACT A time resolved chirp measurement technique is introduced to measure optical carrier fre... more ABSTRACT A time resolved chirp measurement technique is introduced to measure optical carrier frequency fluctuations during the sub-nanosecond off-on and on-off transition of electro- optical switches based on semiconductor optical amplifiers. A periodic injected current signal was used for the switching action and a high performance optical bandpass filter for frequency discrimination. The results show a chirp peak of 3 GHz for injected current excursion of 80 mA.
Latin America Optics and Photonics Conference, 2010
Page 1. Periodic Time-Components in Spontaneous Ultra-Weak Photon Emission of Wheat Seedlings in ... more Page 1. Periodic Time-Components in Spontaneous Ultra-Weak Photon Emission of Wheat Seedlings in Stressing Solutions Bertonha E.1,2,3, Moraes TA1, Conforti E.2 and Gallep CM1 1Faculty of Technology, 2Faculty of Electrical ...
2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011), 2011
We have designed and implemented an UWPE (ultra-weak photon emission) measurement system — a dark... more We have designed and implemented an UWPE (ultra-weak photon emission) measurement system — a dark chamber and low dark count PMT module — oriented to environmental control studies. The system is totally controlled by software — power supply, counting board, temperature control and shutter for light excitation. The system&amp;amp;#39;s architecture and performance are described here. In terms of SNR the
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