Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169368
F. Andrade, L. da Silva Mello, M. Rodrigues
Radio propagation at frequencies above 10 GHz suffers severe impairments in tropical regions, especially due to rain attenuation. To design and optimize Fade Mitigation Techniques, the use of attenuation time series is required. Time series synthesizers already developed and in study, for terrestrial and satellite links, are presented and tested in this paper.
{"title":"Development of rain attenuation synthesizers for earth-space and terrestrial links in tropical climates","authors":"F. Andrade, L. da Silva Mello, M. Rodrigues","doi":"10.1109/IMOC.2011.6169368","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169368","url":null,"abstract":"Radio propagation at frequencies above 10 GHz suffers severe impairments in tropical regions, especially due to rain attenuation. To design and optimize Fade Mitigation Techniques, the use of attenuation time series is required. Time series synthesizers already developed and in study, for terrestrial and satellite links, are presented and tested in this paper.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130450474","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169282
U. R. Duarte, G. E. R. de Paiva, F. R. Pereira, E. W. Bezerra, J. Rosolem, M. Romero
In this work we propose a novel wavelength division multiplexing passive optical network (WDM-PON) configuration. The system is based on a colorless optical source employing the injection of amplified spontaneous emission (ASE) into a reflective SOA (R-SOA). In addition, optical detection at the ONTs is carried out by PIN based receivers, without decision threshold level adjustment (DTLA). We investigated the system performance for four directly modulated 1.25 Gb/s channels at the C-band in the presence of chromatic dispersion and experimentally demonstrated error free operation for downstream traffic in a 20 km reach, with 1.0 dB penalty.
{"title":"A WDM-PON implementation employing spectrum sliced ASE source, dispersion management and PIN receivers","authors":"U. R. Duarte, G. E. R. de Paiva, F. R. Pereira, E. W. Bezerra, J. Rosolem, M. Romero","doi":"10.1109/IMOC.2011.6169282","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169282","url":null,"abstract":"In this work we propose a novel wavelength division multiplexing passive optical network (WDM-PON) configuration. The system is based on a colorless optical source employing the injection of amplified spontaneous emission (ASE) into a reflective SOA (R-SOA). In addition, optical detection at the ONTs is carried out by PIN based receivers, without decision threshold level adjustment (DTLA). We investigated the system performance for four directly modulated 1.25 Gb/s channels at the C-band in the presence of chromatic dispersion and experimentally demonstrated error free operation for downstream traffic in a 20 km reach, with 1.0 dB penalty.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130491963","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169272
G. E. R. de Paiva, M. Freire, U. R. Duarte, A. B. Sassi, A. C. Bizetti, J. F. Pozzuto, J. Rosolem, M. Romero
This work describes the experimental demonstration of a 80 km-reach PON system, with a 1:128 split ratio, using a conventional Gigabit-Capable Passive Optical Network (GPON) equipment. The experiment was made possible by the use of bidirectional 1310/1490 nm semiconductor optical amplifiers (SOAs) as well as by a change on the medium access control (MAC) protocol. Results for packet-loss ratio and power budget are given as a function of split ratio and network reach of a field-trial PON.
{"title":"80 km extended Gigabit Passive Optical Network","authors":"G. E. R. de Paiva, M. Freire, U. R. Duarte, A. B. Sassi, A. C. Bizetti, J. F. Pozzuto, J. Rosolem, M. Romero","doi":"10.1109/IMOC.2011.6169272","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169272","url":null,"abstract":"This work describes the experimental demonstration of a 80 km-reach PON system, with a 1:128 split ratio, using a conventional Gigabit-Capable Passive Optical Network (GPON) equipment. The experiment was made possible by the use of bidirectional 1310/1490 nm semiconductor optical amplifiers (SOAs) as well as by a change on the medium access control (MAC) protocol. Results for packet-loss ratio and power budget are given as a function of split ratio and network reach of a field-trial PON.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123366557","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169357
J. Oliveira, Alexandre P. Freitas, U. Moura, E. S. Rosa, J. Diniz, Julio Oliveira, M. Romero
This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM distributed Raman amplified system evaluated in the following scenario: three different channel loads located at the C-Band, advanced modulation formats for 46 and 112 Gb/s data rates, chromatic dispersion compensation across the span and signal re-amplification carried out through optimized distributed Raman amplifiers (DRAs), in three distinct amplifiers configurations. The 46 Gb/s NRZ/DQPSK and 112 Gb/s NRZ/DPQPSK modulation formats show superior performances as well as insensitiveness to the filtering effects. The worst channel Q-Factor after the band pass filters is 3.09 which corresponds to an uncorrected BER threshold of 10−3 for the 12% overhead FEC used.
{"title":"Advanced modulation formats and receiver filtering analysis of optical WDM systems with optimized distributed Raman amplifiers","authors":"J. Oliveira, Alexandre P. Freitas, U. Moura, E. S. Rosa, J. Diniz, Julio Oliveira, M. Romero","doi":"10.1109/IMOC.2011.6169357","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169357","url":null,"abstract":"This paper presents a systemic simulation analysis to find the maximum reach of an optical WDM distributed Raman amplified system evaluated in the following scenario: three different channel loads located at the C-Band, advanced modulation formats for 46 and 112 Gb/s data rates, chromatic dispersion compensation across the span and signal re-amplification carried out through optimized distributed Raman amplifiers (DRAs), in three distinct amplifiers configurations. The 46 Gb/s NRZ/DQPSK and 112 Gb/s NRZ/DPQPSK modulation formats show superior performances as well as insensitiveness to the filtering effects. The worst channel Q-Factor after the band pass filters is 3.09 which corresponds to an uncorrected BER threshold of 10−3 for the 12% overhead FEC used.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129886168","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169371
D. Brito, H. Fernandes, A. D’assunção, X. Begaud
The frequency selectivity that characterizes the response of resonant-type metamaterial transmission lines lend themselves to their applications in filtering devices. In this paper, it is demonstrated that Complementary Split Ring Resonators (CSRRs) can be used for the design of metamaterial transmission lines. The CSRR is used to design a microstrip stop-band filter for Ultra-Wideband (UWB) applications. In CSRRs the main driving mechanism is the electric coupling, and a significant component of the electric field parallel to the axis of the rings is required. So, by etching the CSRRs in the dielectric ground plane of a transmission line, in close proximity to the conductor strip, the required conditions for CSRR excitation are fulfilled.
{"title":"Complementary Split Ring Resonator stop-band filter for UWB applications","authors":"D. Brito, H. Fernandes, A. D’assunção, X. Begaud","doi":"10.1109/IMOC.2011.6169371","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169371","url":null,"abstract":"The frequency selectivity that characterizes the response of resonant-type metamaterial transmission lines lend themselves to their applications in filtering devices. In this paper, it is demonstrated that Complementary Split Ring Resonators (CSRRs) can be used for the design of metamaterial transmission lines. The CSRR is used to design a microstrip stop-band filter for Ultra-Wideband (UWB) applications. In CSRRs the main driving mechanism is the electric coupling, and a significant component of the electric field parallel to the axis of the rings is required. So, by etching the CSRRs in the dielectric ground plane of a transmission line, in close proximity to the conductor strip, the required conditions for CSRR excitation are fulfilled.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125707990","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169415
Ana Carolina S. Ourique, A. J. F. Vieira, Vitor F. Barros, S. da Silva, A. D’assunção
The characteristics of a microstrip filter with a tilted ground plane are investigated. An analysis is performed to compare the properties of a microstrip filter with a flat ground plane to those of microstrip filters with tilted ground plane with different inclination angles, as well as types. The performed computational tests in laboratory showed an improvement of up to 22% in the bandwidth of the filter prototypes with tilted ground planes, while maintaining the impedance matching at a satisfactory level. It is shown that is possible to improve the filter bandwidth by varying the angles and dimensions of the tilted ground plane.
{"title":"Microstrip filters with tilted ground plane","authors":"Ana Carolina S. Ourique, A. J. F. Vieira, Vitor F. Barros, S. da Silva, A. D’assunção","doi":"10.1109/IMOC.2011.6169415","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169415","url":null,"abstract":"The characteristics of a microstrip filter with a tilted ground plane are investigated. An analysis is performed to compare the properties of a microstrip filter with a flat ground plane to those of microstrip filters with tilted ground plane with different inclination angles, as well as types. The performed computational tests in laboratory showed an improvement of up to 22% in the bandwidth of the filter prototypes with tilted ground planes, while maintaining the impedance matching at a satisfactory level. It is shown that is possible to improve the filter bandwidth by varying the angles and dimensions of the tilted ground plane.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131156326","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169325
L. P. Ribeiro, M. Barros, M.S. de Alencar
This paper present the performance analysis of the wavelength assignment four heuristics First-Fit, Random, Least-Used and Most-Used, considering adaptive routing and traffic grooming capabilities in the network. The goal of this comparison is to verify if some of those algorithms present a better performance with relation to First-Fit, considering these capabilities.
{"title":"Performance of wavelength assignment heuristics in a dynamic optical network with adaptive routing and traffic grooming","authors":"L. P. Ribeiro, M. Barros, M.S. de Alencar","doi":"10.1109/IMOC.2011.6169325","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169325","url":null,"abstract":"This paper present the performance analysis of the wavelength assignment four heuristics First-Fit, Random, Least-Used and Most-Used, considering adaptive routing and traffic grooming capabilities in the network. The goal of this comparison is to verify if some of those algorithms present a better performance with relation to First-Fit, considering these capabilities.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131969779","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169239
Ricardo E. Silva, Roberson A. Oliveira, A. Pohl
The development of an optical fiber sensor for measuring resonances and characterizing the amplitude response of piezoelectric transducers is reported. The method based on the use of an extrinsic Fabry-Perot interferometer allows the detection of the transducer deflection peaks which correspond to the piezo resonances. Amplitude response for 1–10 V excitation range is achieved by monitoring the piezoelectric amplitude variations. Linear response with 9.7% amplitude variation/V sensitivity and resonances measurement with a < 1% error comparing with the impedance analysis method are achieved.
{"title":"Optical fiber sensor for characterization of piezoelectric transducers","authors":"Ricardo E. Silva, Roberson A. Oliveira, A. Pohl","doi":"10.1109/IMOC.2011.6169239","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169239","url":null,"abstract":"The development of an optical fiber sensor for measuring resonances and characterizing the amplitude response of piezoelectric transducers is reported. The method based on the use of an extrinsic Fabry-Perot interferometer allows the detection of the transducer deflection peaks which correspond to the piezo resonances. Amplitude response for 1–10 V excitation range is achieved by monitoring the piezoelectric amplitude variations. Linear response with 9.7% amplitude variation/V sensitivity and resonances measurement with a < 1% error comparing with the impedance analysis method are achieved.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129841178","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169384
A. Mussi, T. Abrão
Communication techniques based on multiple-input multiple-output (MIMO) have been increasingly exploited in order to obtain communication systems with high capacity and throughput, against the scenario of increasing scarcity of spectrum. In this context, the semidefinite relaxation (SDR) based-signal detector has attracted enormous interest. The sub-optimal SDR detection strategy is very promising due to its very near-optimal maximum-likelihood (ML) performance combined with polynomial time complexity cost. This work analyzes the SDR detector under MIMO channels, considering its robustness to imperfect channel coefficients estimation, as well as its performance under antenna selection technique.
{"title":"Analysis of semidefinite relaxation detector in MIMO channel","authors":"A. Mussi, T. Abrão","doi":"10.1109/IMOC.2011.6169384","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169384","url":null,"abstract":"Communication techniques based on multiple-input multiple-output (MIMO) have been increasingly exploited in order to obtain communication systems with high capacity and throughput, against the scenario of increasing scarcity of spectrum. In this context, the semidefinite relaxation (SDR) based-signal detector has attracted enormous interest. The sub-optimal SDR detection strategy is very promising due to its very near-optimal maximum-likelihood (ML) performance combined with polynomial time complexity cost. This work analyzes the SDR detector under MIMO channels, considering its robustness to imperfect channel coefficients estimation, as well as its performance under antenna selection technique.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130065176","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 : 2011-10-01DOI: 10.1109/IMOC.2011.6169408
A. S. Teixeira, R. Oliveira, J. S. Furtado, F. N. Barauna, P. S. Cavalcante
In this paper the Parabolic Equation (PE) for narrow angles is presented as a method for electric field prediction in a semi-rural environment. It is located in the two neighboring cities of Brasilia, Brazil's capital. Original data used was obtained by the Brazilian Telecommunications Agency (ANATEL) and Radiobrás through a measurement campaign performed at those cities and compared with the PE simulation.
{"title":"Electric field prediction for medium waves radio broadcasting using parabolic equations","authors":"A. S. Teixeira, R. Oliveira, J. S. Furtado, F. N. Barauna, P. S. Cavalcante","doi":"10.1109/IMOC.2011.6169408","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169408","url":null,"abstract":"In this paper the Parabolic Equation (PE) for narrow angles is presented as a method for electric field prediction in a semi-rural environment. It is located in the two neighboring cities of Brasilia, Brazil's capital. Original data used was obtained by the Brazilian Telecommunications Agency (ANATEL) and Radiobrás through a measurement campaign performed at those cities and compared with the PE simulation.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114208426","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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