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Your search keyword '"telecomunicació"' showing total 4 results
Start Over Descriptor "telecomunicació" Journal ieee photonics technology letters
4 results on '"telecomunicació"'

1. Performance monitor for all-optical networks based on homodyne spectroscopy

Author

A. Amrani, Josep Prat, Jaume Comellas, A. Rafel, Gabriel Junyent, I. Ramdani, J. Roldan, Vicent Sales, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. GCO - Grup de Comunicacions Òptiques

Subjects
Multiwavelength optical networking, spectroscopy, Engineering, Monitoring, business.industry, Optical fibre networks, Optical cross-connect, Telecommunication network reliability, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Optical performance monitoring, Fault (power engineering), Passive optical network, Signal, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Telecomunicació, Optical fibre testing, Optical Transport Network, Telecommunication, Electronic engineering, Electrical and Electronic Engineering, business, Telecommunication network management, Optical communications repeater
Abstract

The ability to transparently detect performance degradations in all-optical networks is highly desirable. We present an optical signal monitor, based on a frequency supervision system, which can participate in some tasks for fault and performance management of transparent optical networks.

Published
2000
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2. Limitation to WDM transmission distance due to cross-phase modulation induced spectral broadening in dispersion compensated standard fiber systems

Author

Polina Bayvel, Vitaly Mikhailov, Robert I. Killey, J. Prat, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. GCO - Grup de Comunicacions Òptiques

Subjects
Materials science, business.industry, Cross-phase modulation, Optical communication, Physics::Optics, Self-phase modulation, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Telecomunicació, Optical fibre communication, Optics, Modulation, Wavelength division multiplexing, Wavelength-division multiplexing, Optical fibre dispersion, Dispersion (optics), Telecommunication, Dispersion-shifted fiber, Electrical and Electronic Engineering, business, Compensation, Doppler broadening
Abstract

We describe large spectral broadening due to the interaction of cross-phase modulation/self-phase modulation and fiber dispersion, and explain its contribution to the penalties in standard fiber systems pre- and postcompensated by dispersion compensating fiber. To our knowledge, this is the first measurement of this effect in a dense WDM transmission system at 10 Gb/s with this dispersion management scheme and good agreement is reported with the numerical modeling results.

Published
1999
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3. Dispersion-shifted fiber polarization scrambler based on Faraday effect

Author

J. Prat, Jaume Comellas, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. GCO - Grup de Comunicacions Òptiques

Subjects
Mode scrambler, Materials science, Optical fibre polarisation, Polarization-maintaining optical fiber, Optical communication equipment, Scrambler, Telecomunicació, symbols.namesake, Optics, Optical fibre losses, Faraday effect, Dispersion-shifted fiber, Heterodyne detection, Electrical and Electronic Engineering, Verdet constant, business.industry, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Polarization (waves), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Optical fibre amplifiers, Optical fibre dispersion, Telecommunication, symbols, business
Abstract

Demonstration of an all-fiber polarization scrambler based on the Faraday effect is carried out. The device has been constructed using dispersion-shifted fiber that has a major tolerance to bends than standard single-mode fiber. Results about the fiber Verdet constant when 1550-nm light is launched are presented. The performance of the constructed device is also shown. Main features are insertion losses as low as 0.4 dB and scrambling frequency up to 20 kHz. Although here we emphasize its application to low-frequency heterodyne detection, the scrambler is applicable to other systems that are polarization dependent. In particular, it would be useful to overcome problems originated by polarization dependent gain in erbium-doped fiber amplified systems.

Published
1999
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4. Experimental demonstration of an all-fiber endless polarization controller based on Faraday rotation

Author

J. Prat, Gabriel Junyent, Jaume Comellas, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. GCO - Grup de Comunicacions Òptiques

Subjects
Optical fiber, Optical fibre polarisation, law.invention, Telecomunicació, symbols.namesake, Optical fibre communication, Polarization controller, Optics, Optical fibres, Time response, Optical fibre losses, law, Faraday effect, Electrical and Electronic Engineering, Faraday cage, Physics, Frequency-shift keying, business.industry, Optical polarisers, Frequency shift keying, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC], Polarization (waves), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, All fiber, Telecommunication, symbols, Magneto-optical devices, business
Abstract

An all-fiber device for the control of the state of polarization (SOP) is presented. The controller is high speed (its time response is less than 50 ms in the worst case), low loss (insertion losses are 2.5 dB independently of the input SOP), and low cost (is constructed with standard single-mode fiber). The polarization controller has been implemented using two Faraday rotators and works at 1550 nm. We have also designed an algorithm that confers an endless performance to the device. The controller has been included in a 2.5 Gb/s CPFSK optical coherent system and results are presented here.

Published
1995
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