The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Antonella Bogoni - One of the best experts on this subject based on the ideXlab platform.
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Wavelength transparent and power level tolerant all-optical packet Envelope Detection circuit for packet switched networks applications
Conference on Lasers and Electro-Optics International Quantum Electronics Conference, 2009Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Paolo Ghelfi, Luca Poti, Antonella BogoniAbstract:We performed extensive characterization of all-optical packet Envelope Detection circuit for ultra-fast packet switched networks. Correct operation with RZ-format data pulses is experimentally demonstrated over a broad range of input packets' wavelengths and power levels.
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Wavelength Transparency of All-Optical Packet Envelope Detection Circuit for RZ-Format Optical Packet Switching Applications
IEEE Photonics Technology Letters, 2009Co-Authors: Francesco Fresi, Claudio Porzi, Mircea Guina, Luca Poti, L. Orsila, Antonella BogoniAbstract:We present results of an extensive characterization of all-optical packet Envelope Detection circuit for packet switched networks. We experimentally demonstrated correct operation with return-to-zero-format data pulses at 10 and 40 Gb/s for a broad range of input wavelengths and power levels.
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All-Optical Packet Envelope Detection Using a Slow Semiconductor Saturable Absorber Gate and a Semiconductor Optical Amplifier
IEEE Journal of Selected Topics in Quantum Electronics, 2008Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Luca Poti, Antonella Bogoni, L. Orsila, Oleg G. Okhotnikov, Nicola CalabrettaAbstract:We propose a simple and effective scheme for all-optical packet Envelope Detection (AO-PED), exploiting a slow saturable absorber-based vertical cavity semiconductor gate and a semiconductor optical amplifier. A high extinction ratio of 15 dB was measured for the recovered Envelope signal. The scheme is suitable for photonic integration, and is transparent to the packet polarization state and data rate. It also shows relatively low sensitivity to the input packet wavelength compared to previous all-optical schemes. AO-PED is experimentally demonstrated at 12.5 and 40 Gb/s; the recovered Envelope was used to drive a 1 2 all-optical switch for low-priority packets deflection in case of contention occurring between time-slotted synchronous packets. The deflected packets could be routed to a buffering stage or to a different path, depending on network topology, allowing thus contention resolution without packet loss. Error-free bit-error rate (BER) was achieved for packet payload data at the switch output.
Claudio Porzi - One of the best experts on this subject based on the ideXlab platform.
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Wavelength transparent and power level tolerant all-optical packet Envelope Detection circuit for packet switched networks applications
Conference on Lasers and Electro-Optics International Quantum Electronics Conference, 2009Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Paolo Ghelfi, Luca Poti, Antonella BogoniAbstract:We performed extensive characterization of all-optical packet Envelope Detection circuit for ultra-fast packet switched networks. Correct operation with RZ-format data pulses is experimentally demonstrated over a broad range of input packets' wavelengths and power levels.
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Wavelength Transparency of All-Optical Packet Envelope Detection Circuit for RZ-Format Optical Packet Switching Applications
IEEE Photonics Technology Letters, 2009Co-Authors: Francesco Fresi, Claudio Porzi, Mircea Guina, Luca Poti, L. Orsila, Antonella BogoniAbstract:We present results of an extensive characterization of all-optical packet Envelope Detection circuit for packet switched networks. We experimentally demonstrated correct operation with return-to-zero-format data pulses at 10 and 40 Gb/s for a broad range of input wavelengths and power levels.
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All-Optical Packet Envelope Detection Using a Slow Semiconductor Saturable Absorber Gate and a Semiconductor Optical Amplifier
IEEE Journal of Selected Topics in Quantum Electronics, 2008Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Luca Poti, Antonella Bogoni, L. Orsila, Oleg G. Okhotnikov, Nicola CalabrettaAbstract:We propose a simple and effective scheme for all-optical packet Envelope Detection (AO-PED), exploiting a slow saturable absorber-based vertical cavity semiconductor gate and a semiconductor optical amplifier. A high extinction ratio of 15 dB was measured for the recovered Envelope signal. The scheme is suitable for photonic integration, and is transparent to the packet polarization state and data rate. It also shows relatively low sensitivity to the input packet wavelength compared to previous all-optical schemes. AO-PED is experimentally demonstrated at 12.5 and 40 Gb/s; the recovered Envelope was used to drive a 1 2 all-optical switch for low-priority packets deflection in case of contention occurring between time-slotted synchronous packets. The deflected packets could be routed to a buffering stage or to a different path, depending on network topology, allowing thus contention resolution without packet loss. Error-free bit-error rate (BER) was achieved for packet payload data at the switch output.
Francesco Fresi - One of the best experts on this subject based on the ideXlab platform.
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Wavelength transparent and power level tolerant all-optical packet Envelope Detection circuit for packet switched networks applications
Conference on Lasers and Electro-Optics International Quantum Electronics Conference, 2009Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Paolo Ghelfi, Luca Poti, Antonella BogoniAbstract:We performed extensive characterization of all-optical packet Envelope Detection circuit for ultra-fast packet switched networks. Correct operation with RZ-format data pulses is experimentally demonstrated over a broad range of input packets' wavelengths and power levels.
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Wavelength Transparency of All-Optical Packet Envelope Detection Circuit for RZ-Format Optical Packet Switching Applications
IEEE Photonics Technology Letters, 2009Co-Authors: Francesco Fresi, Claudio Porzi, Mircea Guina, Luca Poti, L. Orsila, Antonella BogoniAbstract:We present results of an extensive characterization of all-optical packet Envelope Detection circuit for packet switched networks. We experimentally demonstrated correct operation with return-to-zero-format data pulses at 10 and 40 Gb/s for a broad range of input wavelengths and power levels.
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All-Optical Packet Envelope Detection Using a Slow Semiconductor Saturable Absorber Gate and a Semiconductor Optical Amplifier
IEEE Journal of Selected Topics in Quantum Electronics, 2008Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Luca Poti, Antonella Bogoni, L. Orsila, Oleg G. Okhotnikov, Nicola CalabrettaAbstract:We propose a simple and effective scheme for all-optical packet Envelope Detection (AO-PED), exploiting a slow saturable absorber-based vertical cavity semiconductor gate and a semiconductor optical amplifier. A high extinction ratio of 15 dB was measured for the recovered Envelope signal. The scheme is suitable for photonic integration, and is transparent to the packet polarization state and data rate. It also shows relatively low sensitivity to the input packet wavelength compared to previous all-optical schemes. AO-PED is experimentally demonstrated at 12.5 and 40 Gb/s; the recovered Envelope was used to drive a 1 2 all-optical switch for low-priority packets deflection in case of contention occurring between time-slotted synchronous packets. The deflected packets could be routed to a buffering stage or to a different path, depending on network topology, allowing thus contention resolution without packet loss. Error-free bit-error rate (BER) was achieved for packet payload data at the switch output.
Idelfonso Tafur Monroy - One of the best experts on this subject based on the ideXlab platform.
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5 GHz 200 Mbit/s radio over polymer fiber link with Envelope Detection at 650 nm wavelength
Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, 2009Co-Authors: A Caballero, Jesper Bevensee Jensen, Idelfonso Tafur MonroyAbstract:All-optical Envelope Detection of a 5 GHz 200 Mbit/s modulated RF signal and error free transmission over 50 m POF link is achieved by using a 650 nm RCLED.
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All-optical Envelope Detection for Radio-over-Fiber links using external optical injection of a DFB laser
Optics express, 2008Co-Authors: K. Prince, Idelfonso Tafur Monroy, Jorge Seoane, Palle JeppesenAbstract:We outline a novel method performing all-optical Envelope Detection of radio-frequency signals for radio-over-fiber links. A high frequency modulated signal with a slower-varying Envelope is injected into a DFB laser which, due to gain suppression effects, recovers only the Envelope of the optical signal. We characterize the DFB gain suppression effect in terms of injected signal wavelength and power level requirements. System performance is assessed, including experimental bit-error rate results; these illustrate successful Envelope Detection for a 20 GHz carrier with ASK modulation operating at 2.5 Gbit/second. Preliminary results at 5.5 Gbit/s show significant potential for application in hybrid optical-wireless communications networks.
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All-Optical Envelope Detection and Fiber Transmission of Wireless Signals by External Injection of a DFB Laser
IEEE Photonics Technology Letters, 2008Co-Authors: K. Prince, Idelfonso Tafur MonroyAbstract:We outline a novel method for all-optical Envelope Detection of wireless signals by exploiting cross-gain modulation effects in a distributed feedback laser operating with optical injection. We successfully demonstrate Envelope Detection of a 20-GHz carrier amplitude-shift-keying modulated signal at 2.5 Gb/s and its transmission over a 70-km optical fiber link. We present results including bit-error-rate measurements, signal waveforms, and receiver sensitivity penalties associated with Envelope Detection and fiber transmission.
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Optical coherent and Envelope Detection for photonic wireless communication links
2008Co-Authors: K. Prince, Darko Zibar, Idelfonso Tafur MonroyAbstract:We present two novel optical Detection techniques for radio over fiber (RoF) communication links. Firstly, we present recent results obtained with optical digital coherent Detection of optical phase-modulated ROF signals supporting error-free transmission over 25 km standard SMF with BPSK and QPSK encoded data at bit rates of 50 Msymbol/s. We also present an alternative scheme, which implements all-optical frequency down-conversion of a RoF signal while simultaneously supporting baseband OOK transmissions.. Introduction – Recent trends indicate that the rapid expansion of optical access networks, through increases in the coverage and number of network subscribers should continue for at least the shortto medium-term future. The natural implication of these trends is that network stakeholders will seek to exploit the latent bandwidth available in these growing optical communications networks to transport traffic ultimately destined for delivery via wireless access networks [1,2]. Since its introduction [3], much effort has been made into the adaptation of optical communications networks systems for the delivery of so-called Radio over Fibre (RoF) transmissions [4]. A significant portion of these prior art solutions have focussed on supporting existing communications technologies, even achieving varying levels of commercial success [5]. However, as demands continue to drive the development of higher-throughput connectivity to mobile user terminals, network designers have been advocating the migration into higher spectral bands while also increasing the density of wireless access points – technologies ultimately aimed at satisfying the demand for faster content delivery. For any practical impact therefore, it is imperative that architectures developed for RoF systems be optimised to support a diverse range of radio access infrastructure, spread over varying geographic conditions, while meeting or exceeding the quality of service levels to which the end user has become accustomed and offering a reasonable total (installation, maintenance, upgrade) cost to network operators. We assess the requirements for such a converged access network as robust and sophisticated, while being low-power, low-cost, protocol-agnostic and offering low-complexity, low-profile outdoor equipment. The next section presets recent results obtained with optical coherent Detection at the central office. We then present results obtained when cross gain modulation is exploited in a DFB laser implemented at the RN to perform alloptical Envelope Detection. Coherent Detection – We have implemented [6] a coherent Detection scheme using DSP for linear signal demodulation and carrier recovery in phase-modulated RoF links. The proposed technique exploits the increased spectral efficiency offered by angle modulation formats and the linearity offered by optical phase modulation; it also allows the implementation of simplified remote antenna stations since phase modulators may be operated without bias. Experimental results indicating demodulated eye diagrams and Q-factor values are presented in Fig. 2. Eye diagrams for BPSK were obtained after back to back (2a) and with 25 km of transmission using SSMF (2b); QPSK eye diagrams after 25 km SSMF are also presented for II (2c) and IQ (2d). We also present the receiver sensitivity Fig. 1. Converged access network model under consideration. Baseband signals originating at outdoor network unit (ONU), and pass-band signals originating at wireless access point (WAP), nodes sent to central office (CO) via the remote node (RN). results obtained for 50 Mbaud transmissions with this scheme as Fig. 2e. We observe that for the considered values of received optical power, the Q-factor values exceed the value for the error free transmission. All-optical Envelope Detection – Following our previous work with all-optical halfwave rectification [7], and the exploitation of cross-gain modulation for RoF signal frequency downconversion [8], we investigated its application in a converged all-optical access network. This scheme relies on only common, simple optical components, with no electronic RF signal processing, and allows re-use of optical and RF carrier signals [9]. Our results are presented in Fig. 3 and indicate that a good quality signal is obtained at the output of the 70 km optical network. Conclusion – We have developed novel schemes for providing converged wireless and fixed connectivity solutions. We have obtained error free signal demodulation (based on Q factor evaluation) for coherently detected BPSK and QPSK modulation formats with 5 GHz RF carrier after 25 km of transmission through SMF. Clear eye diagrams were also obtained for the all-optical Envelope Detection and transmission through 70 km of various types of transmission media: this indicates the feasibility of this novel scheme. Further work includes the evaluation of the ultimate benefits and performance limitations of both optical Detection techniques presented and identification of the most suitable networking scenarios for their applications. References [1] G.K. Chang, “Convergence of Optical and Wireless Access Networks,” in OFC, San Diego, USA, 2008, OMC workshop. [2] S. Trigila et al., “A service architecture for fixed and mobile convergence,” Computer Commun., vol. 25, no. 2, pp. 133–48. [3] A. Cooper, “‘Fibre/Radio’ for the provision of cordless/mobile telephony services in the access network,” Electron. Lett., vol. 26, no. 24, pp. 2054–2056, Nov 1990. [4] J. Capmany , D Novak,. “Microwave photonics combines two worlds” Nature Photon., vol. 1, no.6, pp. 319-330, Jun 2007 [5] D. Wake, “Trends and prospects for radio over fibre picocells,” Intl. Topical Meet. Microw. Photon., Nov 2002, pp. 21–24. [6] D. Zibar et al, “DSP based Coherent Receiver for Phase-Modulated Radio-over-Fiber Optical Links” OFC 2008 [7] I. Tafur Monroy et al., “All-optical Envelope Detection for wireless photonic communication,” in Proc. ECOC, Berlin, 2007 [8] K. Prince et al., “All-optical Envelope Detection for radio-over-fiber links using external optical injection of a DFB laser” Opt. Express, vol. 16, pp 2005-2014, 2008 [9] J. Soeane et al., “Local-Oscillator-Free Wireless-Optical-Wireless Data Link at 1.25 Gbit/s over a 40 GHz Carrier Employing Carrier Preservation and Envelope Detection,” in Proc. OFC, San Diego, USA, 2008 Fig. 2. Showing a sample of eye diagrams obtained with Coherent Detector System; BPSK back to back (a), BPSK via 25 km SSMF; as well as QPSK sent via 25 km SSMF, resolved as II (c) and IQ (d) components. Receiver sensitivity is also shown (e). Fig. 3. Sample showing evolution of RoF signals through network: (a) Optical halfwave rectified signals leaving WAP, (b) received at RN after 20 km SSMF; signals received at CO (c and d) and after post-photoDetection filtering (e and f), when 50 km (NZDSF and SSMF respectively) implemented between RN and CO.
Mircea Guina - One of the best experts on this subject based on the ideXlab platform.
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Wavelength transparent and power level tolerant all-optical packet Envelope Detection circuit for packet switched networks applications
Conference on Lasers and Electro-Optics International Quantum Electronics Conference, 2009Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Paolo Ghelfi, Luca Poti, Antonella BogoniAbstract:We performed extensive characterization of all-optical packet Envelope Detection circuit for ultra-fast packet switched networks. Correct operation with RZ-format data pulses is experimentally demonstrated over a broad range of input packets' wavelengths and power levels.
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Wavelength Transparency of All-Optical Packet Envelope Detection Circuit for RZ-Format Optical Packet Switching Applications
IEEE Photonics Technology Letters, 2009Co-Authors: Francesco Fresi, Claudio Porzi, Mircea Guina, Luca Poti, L. Orsila, Antonella BogoniAbstract:We present results of an extensive characterization of all-optical packet Envelope Detection circuit for packet switched networks. We experimentally demonstrated correct operation with return-to-zero-format data pulses at 10 and 40 Gb/s for a broad range of input wavelengths and power levels.
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All-Optical Packet Envelope Detection Using a Slow Semiconductor Saturable Absorber Gate and a Semiconductor Optical Amplifier
IEEE Journal of Selected Topics in Quantum Electronics, 2008Co-Authors: Claudio Porzi, Francesco Fresi, Mircea Guina, Luca Poti, Antonella Bogoni, L. Orsila, Oleg G. Okhotnikov, Nicola CalabrettaAbstract:We propose a simple and effective scheme for all-optical packet Envelope Detection (AO-PED), exploiting a slow saturable absorber-based vertical cavity semiconductor gate and a semiconductor optical amplifier. A high extinction ratio of 15 dB was measured for the recovered Envelope signal. The scheme is suitable for photonic integration, and is transparent to the packet polarization state and data rate. It also shows relatively low sensitivity to the input packet wavelength compared to previous all-optical schemes. AO-PED is experimentally demonstrated at 12.5 and 40 Gb/s; the recovered Envelope was used to drive a 1 2 all-optical switch for low-priority packets deflection in case of contention occurring between time-slotted synchronous packets. The deflected packets could be routed to a buffering stage or to a different path, depending on network topology, allowing thus contention resolution without packet loss. Error-free bit-error rate (BER) was achieved for packet payload data at the switch output.