Pub Date : 2011-07-18DOI: 10.5220/0003437201280132
A. Ahrens, J. Pankow, S. Aust, S. Lochmann
Wireless communication is nowadays one of the areas attracting a lot of research activity due to the strongly increasing demand in high-data rate transmission systems. The use of multiple antennas at both the transmitter and receiver side has stimulated one of the most important technical breakthroughs in recent communications allowing increasing the capacity and dropping the bit-error rate. However, multiple-input multiple-output (MIMO) systems are not limited to wireless MIMO systems and can be observed in a huge variety of transmission links and network parts and have attracted a lot of attention since the mid 90's. In the field of optical MIMO transmission systems, multi-mode (MM) fibre offers the possibility to transmit different signals by different mode groups. The perspective of the MIMO philosophy within the field of optical transmission systems is elaborated in this contribution based on channel measurements within a (2 × 2) MIMO system. For the channel measurements the second optical window and a fibre length of 1.4 km was chosen. Computer simulations on an overall data rate of 10.24 Gbps underline the potential of multi-mode fibres in optical high-data rate MIMO communication systems and show that in order to achieve the best bit-error rate, not necessarily all MIMO layers have to be activated.
{"title":"Optical MIMO multimode fiber links channel measurements and system performance analysis","authors":"A. Ahrens, J. Pankow, S. Aust, S. Lochmann","doi":"10.5220/0003437201280132","DOIUrl":"https://doi.org/10.5220/0003437201280132","url":null,"abstract":"Wireless communication is nowadays one of the areas attracting a lot of research activity due to the strongly increasing demand in high-data rate transmission systems. The use of multiple antennas at both the transmitter and receiver side has stimulated one of the most important technical breakthroughs in recent communications allowing increasing the capacity and dropping the bit-error rate. However, multiple-input multiple-output (MIMO) systems are not limited to wireless MIMO systems and can be observed in a huge variety of transmission links and network parts and have attracted a lot of attention since the mid 90's. In the field of optical MIMO transmission systems, multi-mode (MM) fibre offers the possibility to transmit different signals by different mode groups. The perspective of the MIMO philosophy within the field of optical transmission systems is elaborated in this contribution based on channel measurements within a (2 × 2) MIMO system. For the channel measurements the second optical window and a fibre length of 1.4 km was chosen. Computer simulations on an overall data rate of 10.24 Gbps underline the potential of multi-mode fibres in optical high-data rate MIMO communication systems and show that in order to achieve the best bit-error rate, not necessarily all MIMO layers have to be activated.","PeriodicalId":255339,"journal":{"name":"Proceedings of the International Conference on Optical Communication Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126909058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-07-18DOI: 10.5220/0003551501110120
T. Alves, A. Cartaxo
A photonic (Ph) analogue-to-digital (ADC) converter architecture based on the wavelength division multiplexing (WDM) technique used to provide compressed spectrum of the ultra wideband radio signals that are being used in a given pico-cell area for monitoring purposes is presented. The signal at the different points of the WDM Ph-ADC architecture is analyzed and discussed in detail. The advantages/disadvantages of the WDM architecture are identified and compared with its time division multiplexing (TDM) counterpart. It is shown that the WDM Ph-ADC architecture provides adequate time stretching of the wireless signals captured in a given pico-cell. This system enables relaxing the bandwidth requirements of the electrical ADCs used to digitize the wireless signals prior digital signal processing is applied for spectrum and transceivers localization monitoring. In addition, it is concluded that the WDM Ph-ADC architecture supports higher pulse repetition rates than the TDM Ph-ADC architecture being of special interest when a fast up-date of the radio channel monitoring is required.
{"title":"Photonic analogue-to-digital converter based on wavelength division multiplexing technique","authors":"T. Alves, A. Cartaxo","doi":"10.5220/0003551501110120","DOIUrl":"https://doi.org/10.5220/0003551501110120","url":null,"abstract":"A photonic (Ph) analogue-to-digital (ADC) converter architecture based on the wavelength division multiplexing (WDM) technique used to provide compressed spectrum of the ultra wideband radio signals that are being used in a given pico-cell area for monitoring purposes is presented. The signal at the different points of the WDM Ph-ADC architecture is analyzed and discussed in detail. The advantages/disadvantages of the WDM architecture are identified and compared with its time division multiplexing (TDM) counterpart. It is shown that the WDM Ph-ADC architecture provides adequate time stretching of the wireless signals captured in a given pico-cell. This system enables relaxing the bandwidth requirements of the electrical ADCs used to digitize the wireless signals prior digital signal processing is applied for spectrum and transceivers localization monitoring. In addition, it is concluded that the WDM Ph-ADC architecture supports higher pulse repetition rates than the TDM Ph-ADC architecture being of special interest when a fast up-date of the radio channel monitoring is required.","PeriodicalId":255339,"journal":{"name":"Proceedings of the International Conference on Optical Communication Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127559127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-07-18DOI: 10.5220/0003433501230127
Xiaoying He, D. N. Wang, C. Liao
A simple linear cavity erbium-doped linear-cavity laser is proposed and experimentally demonstrated, with tunable and switchable multi-wavelength SLM operation. The main mode-selection components of our system include an FBG Sagnac loop, an umpumped EDF together with a tunable FBG. The unpumped EDF together with the tunable FBG form a super narrow-band self-tracking FBG around the reflection peak of such tunable FBG, which ensures the SLM laser operation. By simple adjustment of two polarization controller, the laser can be designed to operate in a stable single-wavelength or dual-wavelength with a wavelength spacing of 0.05 nm at room temperature.
{"title":"A stable tunable and switchable dual-wavelength single-longitudinal-mode erbium-doped fiber linear-cavity laser","authors":"Xiaoying He, D. N. Wang, C. Liao","doi":"10.5220/0003433501230127","DOIUrl":"https://doi.org/10.5220/0003433501230127","url":null,"abstract":"A simple linear cavity erbium-doped linear-cavity laser is proposed and experimentally demonstrated, with tunable and switchable multi-wavelength SLM operation. The main mode-selection components of our system include an FBG Sagnac loop, an umpumped EDF together with a tunable FBG. The unpumped EDF together with the tunable FBG form a super narrow-band self-tracking FBG around the reflection peak of such tunable FBG, which ensures the SLM laser operation. By simple adjustment of two polarization controller, the laser can be designed to operate in a stable single-wavelength or dual-wavelength with a wavelength spacing of 0.05 nm at room temperature.","PeriodicalId":255339,"journal":{"name":"Proceedings of the International Conference on Optical Communication Systems","volume":"38-40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116768046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-07-18DOI: 10.5220/0003488701330138
Bruno M. M. Meireles, J. Rebola
Due to its spectral efficiency, dispersion robustness, simplicity and transparency to electrical modulation format, orthogonal frequency division multiplexing (OFDM) is a promising technique that allows to increase the capacity and to make the upgrade of optical telecommunications systems already installed. In this work, the study and optimization of OFDM transmission in an optical communication system using direct detection with a short and medium range (metropolitan and regional networks) for a target bit rate of 10 Gbps will be performed exhaustively. The optimization is carried out taking into account the impact of noise accumulation and of signal distortion resulting from bandwidth narrowing introduced by the cascade of add-drop multiplexing nodes on the network performance. Optical transmission of single sideband OFDM signals is considered and the carrier-to-signal power ratio of the OFDM signal is optimized in order to achieve the best network performance.
{"title":"Optimization of optical SSB-OFDM system with direct detection for application in metropolitan/regional networks","authors":"Bruno M. M. Meireles, J. Rebola","doi":"10.5220/0003488701330138","DOIUrl":"https://doi.org/10.5220/0003488701330138","url":null,"abstract":"Due to its spectral efficiency, dispersion robustness, simplicity and transparency to electrical modulation format, orthogonal frequency division multiplexing (OFDM) is a promising technique that allows to increase the capacity and to make the upgrade of optical telecommunications systems already installed. In this work, the study and optimization of OFDM transmission in an optical communication system using direct detection with a short and medium range (metropolitan and regional networks) for a target bit rate of 10 Gbps will be performed exhaustively. The optimization is carried out taking into account the impact of noise accumulation and of signal distortion resulting from bandwidth narrowing introduced by the cascade of add-drop multiplexing nodes on the network performance. Optical transmission of single sideband OFDM signals is considered and the carrier-to-signal power ratio of the OFDM signal is optimized in order to achieve the best network performance.","PeriodicalId":255339,"journal":{"name":"Proceedings of the International Conference on Optical Communication Systems","volume":"55 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127585338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-07-18DOI: 10.5220/0003512101410145
N. I. Khan, S. H. Choudhury, Arif Ahmed Roni
Semiconductor lasers are the integral parts of optical communication systems. The temperature dependence of the lasing wavelength of a laser is an important issue because it is used in different environment with varying thermal conditions. In this paper, a comparative study of the temperature dependence of lasing wavelength of two types of laser diode has been presented. The comparison was made between an InGaAsP/InP stripe geometry edge-emitting laser and vertical cavity surface emitting laser (VCSEL) with GaAs in the active region. For both cases, the temperature dependence was observed for different heat sink temperatures ranging from 20°C to 50°Cat an interval of 5°C for an operating current of 0.763A and 1.88mA respectively. The lasing wavelength shifts for stripe laser and VCSEL have been found to be 0.3nm/K and 0.06nm/K respectively. VCSEL exhibits significantly greater thermal stability than stripe laser. The result has also been elucidated with a comprehensive theoretical excerpt.
{"title":"A comparative study of the temperature dependence of lasing wavelength of conventional edge emitting stripe laser and vertical cavity surface emitting laser","authors":"N. I. Khan, S. H. Choudhury, Arif Ahmed Roni","doi":"10.5220/0003512101410145","DOIUrl":"https://doi.org/10.5220/0003512101410145","url":null,"abstract":"Semiconductor lasers are the integral parts of optical communication systems. The temperature dependence of the lasing wavelength of a laser is an important issue because it is used in different environment with varying thermal conditions. In this paper, a comparative study of the temperature dependence of lasing wavelength of two types of laser diode has been presented. The comparison was made between an InGaAsP/InP stripe geometry edge-emitting laser and vertical cavity surface emitting laser (VCSEL) with GaAs in the active region. For both cases, the temperature dependence was observed for different heat sink temperatures ranging from 20°C to 50°Cat an interval of 5°C for an operating current of 0.763A and 1.88mA respectively. The lasing wavelength shifts for stripe laser and VCSEL have been found to be 0.3nm/K and 0.06nm/K respectively. VCSEL exhibits significantly greater thermal stability than stripe laser. The result has also been elucidated with a comprehensive theoretical excerpt.","PeriodicalId":255339,"journal":{"name":"Proceedings of the International Conference on Optical Communication Systems","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130811623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-07-01DOI: 10.1007/978-3-642-35755-8_3
W. Lamersdorf
{"title":"Paradigms of distributed software systems: Services, processes, and self-organization","authors":"W. Lamersdorf","doi":"10.1007/978-3-642-35755-8_3","DOIUrl":"https://doi.org/10.1007/978-3-642-35755-8_3","url":null,"abstract":"","PeriodicalId":255339,"journal":{"name":"Proceedings of the International Conference on Optical Communication Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117151283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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