Pub Date : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582867
J. Lewoc, A. Izworski, Slawomir Skowronski, A. Kieleczawa, E. Leitgeb, Vesna Oileska
From the very beginning of optical networks, there has been a severe lack of analytical techniques enabling effective performance evaluation/prediction for actual networks. The analytical and simulation methods applied have been based on inadequate models. The paper shows the basic inadequacy in the models proposed usually for optical networks, applying so called open system and network approach. The authors propose the approach needed, in particular, for the systems developed in rather poorly countries where the hardware available for the designers was obsolete in comparison to that available in well developed countries. The paper describes some experience in ICT system modeling and the network modeling tool and technique worked out.
{"title":"Optical network modeling techniques: A case study","authors":"J. Lewoc, A. Izworski, Slawomir Skowronski, A. Kieleczawa, E. Leitgeb, Vesna Oileska","doi":"10.1109/NOC-OCI.2013.6582867","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582867","url":null,"abstract":"From the very beginning of optical networks, there has been a severe lack of analytical techniques enabling effective performance evaluation/prediction for actual networks. The analytical and simulation methods applied have been based on inadequate models. The paper shows the basic inadequacy in the models proposed usually for optical networks, applying so called open system and network approach. The authors propose the approach needed, in particular, for the systems developed in rather poorly countries where the hardware available for the designers was obsolete in comparison to that available in well developed countries. The paper describes some experience in ICT system modeling and the network modeling tool and technique worked out.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"6 1","pages":"49-54"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90240749","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582894
P. Garfias, S. Sallent, L. Gutierrez, M. De Andrade, M. Tornatore, A. Buttaboni
Even if Passive Optical Networks (PONs) have proven to be more energy-efficient that other access solutions, energy consumption minimization is becoming an important research target also in PON. In particular, to sustain the increased bandwidth demand of emerging applications in the access section of the network, new hybrid PON solutions employing WDM/TDM are being investigated. Compared with classics PON, the architecture of WDM/TDM-PONs requires more transceivers/receivers, hence they are expected to be more energy hungry than classical PONs. In this paper, we focus on the power consumption minimization in WDM/TDM-PONs and we propose an energy-efficient mechanism based on Dynamic Bandwidth and Wavelength Allocation whose objective is to switch off, whenever possible, the unnecessary receivers for upstream traffic at the Optical Line Terminal (OLT). Our proposed energy saving mechanism is able to decrease energy consumption at the OLT of about 30%, while maintaining the penalty introduced in terms of channel utilization and packet delay within an acceptable range. Detailed implementation of the proposed algorithm is presented, and simulation results are reported to quantify energy savings and effects on network performance on different network scenarios.
{"title":"A novel traffic-aware mechanism for energy-saving at the OLT in WDM/TDM-PON","authors":"P. Garfias, S. Sallent, L. Gutierrez, M. De Andrade, M. Tornatore, A. Buttaboni","doi":"10.1109/NOC-OCI.2013.6582894","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582894","url":null,"abstract":"Even if Passive Optical Networks (PONs) have proven to be more energy-efficient that other access solutions, energy consumption minimization is becoming an important research target also in PON. In particular, to sustain the increased bandwidth demand of emerging applications in the access section of the network, new hybrid PON solutions employing WDM/TDM are being investigated. Compared with classics PON, the architecture of WDM/TDM-PONs requires more transceivers/receivers, hence they are expected to be more energy hungry than classical PONs. In this paper, we focus on the power consumption minimization in WDM/TDM-PONs and we propose an energy-efficient mechanism based on Dynamic Bandwidth and Wavelength Allocation whose objective is to switch off, whenever possible, the unnecessary receivers for upstream traffic at the Optical Line Terminal (OLT). Our proposed energy saving mechanism is able to decrease energy consumption at the OLT of about 30%, while maintaining the penalty introduced in terms of channel utilization and packet delay within an acceptable range. Detailed implementation of the proposed algorithm is presented, and simulation results are reported to quantify energy savings and effects on network performance on different network scenarios.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"92 1","pages":"225-232"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85682813","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582889
I. Jurdana, V. Sucic
The paper presents a novel algorithm for the availability calculation of a ship optical communication network. The impact of the configuration of optical cable paths on the overall network availability is presented. By using availability data from existing networks, a modified expression for availability calculation is developed. It includes impact factors based on the cable network configuration. The applicability of the here proposed method in real-life situations is illustrated on a reference optical network of a ferryboat.
{"title":"A novel algorithm for the availability calculation of a ship optical communication network","authors":"I. Jurdana, V. Sucic","doi":"10.1109/NOC-OCI.2013.6582889","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582889","url":null,"abstract":"The paper presents a novel algorithm for the availability calculation of a ship optical communication network. The impact of the configuration of optical cable paths on the overall network availability is presented. By using availability data from existing networks, a modified expression for availability calculation is developed. It includes impact factors based on the cable network configuration. The applicability of the here proposed method in real-life situations is illustrated on a reference optical network of a ferryboat.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"34 1","pages":"191-198"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74077623","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582901
A. Gatri, Zabih Ghassemlooy, A. Valenzuela, O. Strobel, R. Rejeb, E. Leitgeb
This paper reports experimental results for the performance of a free space optical (FSO) communication link employing a binary-phase-shift-keying subcarrier modulation (BPSK) scheme under the influence of the atmospheric scintillation. A dedicated experimental atmospheric simulation chamber has been built where the effects of weak turbulence regimes on the FSO link can be investigated. The experimental data obtained is compared to the theoretical prevision. The paper also presents how data transmission performance depends on the position of turbulence source within the chamber.
{"title":"Experimental study of the performance for BPSK subcarrier intensity modulation free space optics communications in a laboratory controlled turbulence channel","authors":"A. Gatri, Zabih Ghassemlooy, A. Valenzuela, O. Strobel, R. Rejeb, E. Leitgeb","doi":"10.1109/NOC-OCI.2013.6582901","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582901","url":null,"abstract":"This paper reports experimental results for the performance of a free space optical (FSO) communication link employing a binary-phase-shift-keying subcarrier modulation (BPSK) scheme under the influence of the atmospheric scintillation. A dedicated experimental atmospheric simulation chamber has been built where the effects of weak turbulence regimes on the FSO link can be investigated. The experimental data obtained is compared to the theoretical prevision. The paper also presents how data transmission performance depends on the position of turbulence source within the chamber.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"31 1","pages":"287-292"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91169292","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582884
E. Katz, A. Laufer, Y. Bar-Ness
Single Carrier Decomposed-Quadrature Optical (SC-DQO) modulation has been suggested in the past, as a possible method for use in Optical Wireless (OW) Intensity Modulation with Direct Detection (IM-DD) communication systems. This method has lower peak-to-average power ratio (PAPR) when compared to Asymmetrically-Clipped Optical OFDM (ACO-OFDM). It was shown that its receiver utilizes only 50% of the signal power, while the other 50% is discarded. A new receiving method, based on an estimator which utilizes the discarded portion of the signal, is proposed in this paper, to generate an improved estimator for the transmitted signal. It is shown both theoretically and numerically that the new approach improves the receiver performance of the system by up to 3dB, achieving the efficiency of the latest ACO-OFDM methods, while preserving the PAPR advantage. With this approach, both the transmitter and the modulated signal are not changed while the additional receiver computational complexity is negligible.
{"title":"A new improved-performance receiver for Single-Carrier-Decomposed Quadrature optical wireless communication systems","authors":"E. Katz, A. Laufer, Y. Bar-Ness","doi":"10.1109/NOC-OCI.2013.6582884","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582884","url":null,"abstract":"Single Carrier Decomposed-Quadrature Optical (SC-DQO) modulation has been suggested in the past, as a possible method for use in Optical Wireless (OW) Intensity Modulation with Direct Detection (IM-DD) communication systems. This method has lower peak-to-average power ratio (PAPR) when compared to Asymmetrically-Clipped Optical OFDM (ACO-OFDM). It was shown that its receiver utilizes only 50% of the signal power, while the other 50% is discarded. A new receiving method, based on an estimator which utilizes the discarded portion of the signal, is proposed in this paper, to generate an improved estimator for the transmitted signal. It is shown both theoretically and numerically that the new approach improves the receiver performance of the system by up to 3dB, achieving the efficiency of the latest ACO-OFDM methods, while preserving the PAPR advantage. With this approach, both the transmitter and the modulated signal are not changed while the additional receiver computational complexity is negligible.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"31 1","pages":"163-170"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75360034","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582887
B. Milivojevic, S. Wiese, C. Raabe, A. Shastri, M. Webster, P. Metz, B. Chattin, B. Dama, K. Shastri
We report on the smallest Silicon Photonic modulator and lowest power Complementary Metal-Oxide-Semiconductor Mach-Zehnder Modulator (CMOS MZM) Driver for next generation Coherent Transceivers. Bit-Error-Ratio (BER) characterization of this device demonstrates comparable performance relative to a commercial Lithium Niobate (LN) modulator and capability of highperformance transmission for long-haul applications.
{"title":"Small-size Silicon Photonic IQ modulator and low-power CMOS driver for next generation Coherent Transceivers","authors":"B. Milivojevic, S. Wiese, C. Raabe, A. Shastri, M. Webster, P. Metz, B. Chattin, B. Dama, K. Shastri","doi":"10.1109/NOC-OCI.2013.6582887","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582887","url":null,"abstract":"We report on the smallest Silicon Photonic modulator and lowest power Complementary Metal-Oxide-Semiconductor Mach-Zehnder Modulator (CMOS MZM) Driver for next generation Coherent Transceivers. Bit-Error-Ratio (BER) characterization of this device demonstrates comparable performance relative to a commercial Lithium Niobate (LN) modulator and capability of highperformance transmission for long-haul applications.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"37 1","pages":"181-184"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75622624","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582863
T. Cseh, T. Berceli
Multimode fiber links can offer a useful approach for low cost and short Radio over Fiber (RoF) systems. However, in these connections the distortion effects are higher than in a singlemode fiber system. These effects can be compensated by a suitable optical receiver. In this paper an improved receiver structure is investigated for Radio over Multimode fiber systems. N-QAM radio signal transmission is simulated and measured on multimode fiber connections. Several improved compensating reception methods are compared with simple detection. From the different improved methods and installations an optimum solution is chosen for Radio over Multimode Fiber systems.
{"title":"Improved receiver techniques for Radio over Multimode fiber systems","authors":"T. Cseh, T. Berceli","doi":"10.1109/NOC-OCI.2013.6582863","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582863","url":null,"abstract":"Multimode fiber links can offer a useful approach for low cost and short Radio over Fiber (RoF) systems. However, in these connections the distortion effects are higher than in a singlemode fiber system. These effects can be compensated by a suitable optical receiver. In this paper an improved receiver structure is investigated for Radio over Multimode fiber systems. N-QAM radio signal transmission is simulated and measured on multimode fiber connections. Several improved compensating reception methods are compared with simple detection. From the different improved methods and installations an optimum solution is chosen for Radio over Multimode Fiber systems.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"48 1","pages":"23-26"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/NOC-OCI.2013.6582863","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72522779","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582865
R. Ribeiro, Frédéric Lucarz, B. Fracasso
In this paper it is proposed and designed an original all-optical Encoder (o-Encoder) intended, but not exclusively, to be part of future optical digitising radio-over-fibre (o-DRoF) transceiver. It is based on the Semiconductor Laser Amplifier Loop Mirror (SLALOM) configuration exploiting the nonlinearities of a semiconductor optical amplifier (SOA) in cross-switching regime. The proof-of-principle is established using 40-ps RZ control pulses at 2.5 GHz in the C-band. It outputs serially encoded, quantized and amplified optical RZ bits. Computer simulations of the proposed o-Encoder have shown promising results. The proposed device is rather compact, potentially optically integrable and requires much less input optical power (by several orders of magnitude) than other photonic-encoders and can also naturally convert wavelengths in the optical domain.
{"title":"Proposal and design of an all-optical encoder for digitising radio-over-fibre transceivers","authors":"R. Ribeiro, Frédéric Lucarz, B. Fracasso","doi":"10.1109/NOC-OCI.2013.6582865","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582865","url":null,"abstract":"In this paper it is proposed and designed an original all-optical Encoder (o-Encoder) intended, but not exclusively, to be part of future optical digitising radio-over-fibre (o-DRoF) transceiver. It is based on the Semiconductor Laser Amplifier Loop Mirror (SLALOM) configuration exploiting the nonlinearities of a semiconductor optical amplifier (SOA) in cross-switching regime. The proof-of-principle is established using 40-ps RZ control pulses at 2.5 GHz in the C-band. It outputs serially encoded, quantized and amplified optical RZ bits. Computer simulations of the proposed o-Encoder have shown promising results. The proposed device is rather compact, potentially optically integrable and requires much less input optical power (by several orders of magnitude) than other photonic-encoders and can also naturally convert wavelengths in the optical domain.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"63 1","pages":"35-42"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82073642","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582870
A. Kos, Urban Sedlar, J. Sterle, M. Volk, J. Bester, M. Bajec
We present applications for network monitoring based on intelligent communication platform that can also be used to support various usage scenarios related to future internet of things. Applications presented include real time DSL access line monitoring and IPTV monitoring, correlated with lightning reports. The solution is used in the field of proactive monitoring, enabling the operator's helpdesk and field technical teams to pinpoint the cause of service degradations.
{"title":"Network monitoring applications based on IoT system","authors":"A. Kos, Urban Sedlar, J. Sterle, M. Volk, J. Bester, M. Bajec","doi":"10.1109/NOC-OCI.2013.6582870","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582870","url":null,"abstract":"We present applications for network monitoring based on intelligent communication platform that can also be used to support various usage scenarios related to future internet of things. Applications presented include real time DSL access line monitoring and IPTV monitoring, correlated with lightning reports. The solution is used in the field of proactive monitoring, enabling the operator's helpdesk and field technical teams to pinpoint the cause of service degradations.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"43 1","pages":"69-74"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83592507","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 : 2013-07-10DOI: 10.1109/NOC-OCI.2013.6582873
Ahmed E. Morra, Haitham S. Khallaf, H. Shalaby, Z. Kawasaki
Atmospheric turbulence, also called scintillation, is one of the major challenges that face free space optics (FSO) communications. In this paper, we derive both exact and approximate expressions for the average symbol-error rate (SER) of free-space optics systems adopting multipulse PPM (MPPM) technique in gamma-gamma channels. Our expressions are then verified by getting the same results using lognormal and exponential channel expressions where lognormal and exponential distributions are valid only for weak and strong turbulence, respectively. As the computation of the exact expression is time consuming, we get an approximate expression based on Gauss-Laguerre quadrature. Both expressions produce almost the same results. Finally, we make a comparison between the average SER performance of MPPM and PPM assuming equal average energy per bit and equal data rate. We found that the performance of MPPM is better than that of PPM in case of weak turbulence but at strong turbulence both MPPM and PPM have nearly the same performance.
{"title":"An exact expression for symbol-error rate of multipulse PPM technique in free-space optics with gamma-gamma channels","authors":"Ahmed E. Morra, Haitham S. Khallaf, H. Shalaby, Z. Kawasaki","doi":"10.1109/NOC-OCI.2013.6582873","DOIUrl":"https://doi.org/10.1109/NOC-OCI.2013.6582873","url":null,"abstract":"Atmospheric turbulence, also called scintillation, is one of the major challenges that face free space optics (FSO) communications. In this paper, we derive both exact and approximate expressions for the average symbol-error rate (SER) of free-space optics systems adopting multipulse PPM (MPPM) technique in gamma-gamma channels. Our expressions are then verified by getting the same results using lognormal and exponential channel expressions where lognormal and exponential distributions are valid only for weak and strong turbulence, respectively. As the computation of the exact expression is time consuming, we get an approximate expression based on Gauss-Laguerre quadrature. Both expressions produce almost the same results. Finally, we make a comparison between the average SER performance of MPPM and PPM assuming equal average energy per bit and equal data rate. We found that the performance of MPPM is better than that of PPM in case of weak turbulence but at strong turbulence both MPPM and PPM have nearly the same performance.","PeriodicalId":57196,"journal":{"name":"光通信研究","volume":"32 1","pages":"93-98"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85584721","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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