Pub Date : 2014-12-18DOI: 10.1109/ICOCN.2014.6987067
Mingjie Li, Lijia Zhang, Bo Liu, Qi Zhang, Yongjun Wang, Qinghua Tian, Xiaoli Yin, X. Xin, Kai Wang, Jiaxiu Zou
A new method to optimize the gain spectrum of a multi-pumped fibre Raman amplifier (FRA) is proposed, based on differential evolution algorithm (DE). In this method, when the wavelengths of the signals, the number of the pumps, the number of iterations and the range of pump wavelength and power are given in advance, it is possible to get an optimized gain spectrum. With two pumps in FRA, we can get a flat gain spectrum, whose gain ripple is 1.6dB and range is from 1530nm to 1558nm, by using this method.
{"title":"Design of multi-pumped Raman fiber amplifier by differential evolution optimization","authors":"Mingjie Li, Lijia Zhang, Bo Liu, Qi Zhang, Yongjun Wang, Qinghua Tian, Xiaoli Yin, X. Xin, Kai Wang, Jiaxiu Zou","doi":"10.1109/ICOCN.2014.6987067","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987067","url":null,"abstract":"A new method to optimize the gain spectrum of a multi-pumped fibre Raman amplifier (FRA) is proposed, based on differential evolution algorithm (DE). In this method, when the wavelengths of the signals, the number of the pumps, the number of iterations and the range of pump wavelength and power are given in advance, it is possible to get an optimized gain spectrum. With two pumps in FRA, we can get a flat gain spectrum, whose gain ripple is 1.6dB and range is from 1530nm to 1558nm, by using this method.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129758415","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 : 2014-12-18DOI: 10.1109/ICOCN.2014.6987123
Xiaoxue Gong, Yejun Liu, Lei Guo
Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON) has been considered as a promising candidate for the next generation access network due to its high spectrum efficiency, flexible resource allocation and natural compatibility with Digital Signal Processing (DSP) implementation. In the OFDM-PON, power efficiency is one of important topics attained extensive attentions because the access network is a main power contributor in the whole infrastructure. The previous works focused on reducing the power consumption of OFDM-PON in the Media Access Control (MAC) layer. In this paper, we investigate the joint optimization of bit and power loading for saving power consumptions in the OFDM-PON from the algorithm level perspective. With the constraints of the total bit rate requirement and the acceptable Bit Error Rate (BER), we aim to minimize the transmitted power of ONUs in the OFDM-PON. We transformed this problem into a mathematic model, and then we proposed an efficient algorithm to jointly optimize the bit and power loading, according to our model. Simulation results demonstrate the performances of our proposed algorithm.
{"title":"Joint optimization of bit and power loading for power efficient OFDM-PON","authors":"Xiaoxue Gong, Yejun Liu, Lei Guo","doi":"10.1109/ICOCN.2014.6987123","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987123","url":null,"abstract":"Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON) has been considered as a promising candidate for the next generation access network due to its high spectrum efficiency, flexible resource allocation and natural compatibility with Digital Signal Processing (DSP) implementation. In the OFDM-PON, power efficiency is one of important topics attained extensive attentions because the access network is a main power contributor in the whole infrastructure. The previous works focused on reducing the power consumption of OFDM-PON in the Media Access Control (MAC) layer. In this paper, we investigate the joint optimization of bit and power loading for saving power consumptions in the OFDM-PON from the algorithm level perspective. With the constraints of the total bit rate requirement and the acceptable Bit Error Rate (BER), we aim to minimize the transmitted power of ONUs in the OFDM-PON. We transformed this problem into a mathematic model, and then we proposed an efficient algorithm to jointly optimize the bit and power loading, according to our model. Simulation results demonstrate the performances of our proposed algorithm.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125164582","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}
The continuous growth of IP traffic in combination with emerging applications with various bandwidth demands is driving the introduction of elastic optical network (EON) with flex grid. EON can increase spectrum utilization by better matching data rate with the allocated bandwidth and improve the spectral efficiency by multi-carrier and high-order modulation solutions. In this article the architecture and key technologies for physical layers of EON will be introduced. We propose optical-comb based bandwidth-variable optical transponder and optical switching node supporting software definition. Key technologies for physical layer of elastic optical networks are experimentally demonstrated, including bandwidth-variable add/drop, subband switching, spectrum conversion, defragmentation and multicasting for optical superchannel.
{"title":"Key technologies for elastic optical networks","authors":"Zhangyuan Chen, Paikun Zhu, Juhao Li, Yingying Xu, Zhongying Wu, Xin Chen, Yuanxiang Chen, Yongqi He","doi":"10.1109/ICOCN.2014.6987060","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987060","url":null,"abstract":"The continuous growth of IP traffic in combination with emerging applications with various bandwidth demands is driving the introduction of elastic optical network (EON) with flex grid. EON can increase spectrum utilization by better matching data rate with the allocated bandwidth and improve the spectral efficiency by multi-carrier and high-order modulation solutions. In this article the architecture and key technologies for physical layers of EON will be introduced. We propose optical-comb based bandwidth-variable optical transponder and optical switching node supporting software definition. Key technologies for physical layer of elastic optical networks are experimentally demonstrated, including bandwidth-variable add/drop, subband switching, spectrum conversion, defragmentation and multicasting for optical superchannel.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116248622","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 : 2014-12-18DOI: 10.1109/ICOCN.2014.6987138
Shanqing Chen, Shanguo Huang, Qian Kong, Jun Liu, S. Yin, Min Zhang, Jie Zhang
We propose an AWGR and SOA based scalable optical packet switch architecture with modular structure and highly distributed control scheme for data center networks. Numerical results show this architecture can achieve high throughput with low blocking probability and latency.
{"title":"A distributed and scalable optical packet switch architecture for data centers","authors":"Shanqing Chen, Shanguo Huang, Qian Kong, Jun Liu, S. Yin, Min Zhang, Jie Zhang","doi":"10.1109/ICOCN.2014.6987138","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987138","url":null,"abstract":"We propose an AWGR and SOA based scalable optical packet switch architecture with modular structure and highly distributed control scheme for data center networks. Numerical results show this architecture can achieve high throughput with low blocking probability and latency.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"515 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116333619","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 : 2014-12-18DOI: 10.1109/ICOCN.2014.6987105
Fan Zhang, Rui Ding, Dan-Bing Wang, Tingting Zhang
In this paper, we review optical switching experiments of Nyquist superchannel with flexible bit rate. The various switching data capacities of 40,100 and 400-Gb/s are achieved by employing adaptive multi-level or hybrid quadrature amplitude modulation (QAM) formats. We aggregate superchannels with enough guard bands for optical superchannel switching with slight error vector magnitude (EVM) penalty. We also demonstrate Terabit optical switching functionality of polarization division multiplexed (PDM) 64-QAM signals with Nyquist pulse shaping.
{"title":"Optical switching of Nyquist superchannel with flexible bit rate","authors":"Fan Zhang, Rui Ding, Dan-Bing Wang, Tingting Zhang","doi":"10.1109/ICOCN.2014.6987105","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987105","url":null,"abstract":"In this paper, we review optical switching experiments of Nyquist superchannel with flexible bit rate. The various switching data capacities of 40,100 and 400-Gb/s are achieved by employing adaptive multi-level or hybrid quadrature amplitude modulation (QAM) formats. We aggregate superchannels with enough guard bands for optical superchannel switching with slight error vector magnitude (EVM) penalty. We also demonstrate Terabit optical switching functionality of polarization division multiplexed (PDM) 64-QAM signals with Nyquist pulse shaping.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126359134","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}
We discuss the role of multi-layer plan in PON design and introduce a PON planning tool. Starting from the multi-layer mapping and routing mechanism, the automatic plan algorithm of multi-layers and related failure simulation are analyzed. Automatic planning and failure simulation based on the multi-layer model are experimentally demonstrated.
{"title":"Automatic multi-layer planning for PON design and failure simulation","authors":"Yaocheng Yu, Yangxiao Wang, Hui Li, Guojun Liu, Rentao Gu, Yuefeng Ji","doi":"10.1109/ICOCN.2014.6987122","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987122","url":null,"abstract":"We discuss the role of multi-layer plan in PON design and introduce a PON planning tool. Starting from the multi-layer mapping and routing mechanism, the automatic plan algorithm of multi-layers and related failure simulation are analyzed. Automatic planning and failure simulation based on the multi-layer model are experimentally demonstrated.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125755160","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}
This work studies how to take the advantage of the centralized network control and management (NC&M) provided by OpenFlow-controlled software-defined elastic optical networks (SD-EONs) for online spectrum defragmentation. We design a control plane framework, and conduct control plane experiments in an SD-EON testbed to demonstrate the effectiveness of the framework. Experimental results indicate that the framework can improve the network performance in an effective way.
{"title":"OpenFlow-controlled online spectrum defragmentation in software-defined elastic optical networks","authors":"Cen Chen, Xiaoliang Chen, Shoujiang Ma, Zuqing Zhu","doi":"10.1109/ICOCN.2014.6987110","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987110","url":null,"abstract":"This work studies how to take the advantage of the centralized network control and management (NC&M) provided by OpenFlow-controlled software-defined elastic optical networks (SD-EONs) for online spectrum defragmentation. We design a control plane framework, and conduct control plane experiments in an SD-EON testbed to demonstrate the effectiveness of the framework. Experimental results indicate that the framework can improve the network performance in an effective way.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132143558","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 : 2014-12-18DOI: 10.1109/ICOCN.2014.6987141
Shuchao Zhang, Xiaodi You, Zhu Hua, Yulong Wang
Free space optical (FSO) communication technology has received significant attention because of its advantages, including free spectrum license, secure transmission, high capacity and low deployment cost. However, optical beams carried with information could be absorbed or scattered during transmission through atmosphere, that makes attenuation and fluctuation to be the main challenges for FSO system, and lots of researches have been done to improve the performance. Recently, we have investigated the reference continuous wave light (RCWL) assisted detection technique in BPSK subcarrier intensity modulated (SIM) free-space optical communication system which can be a supplementary technology for Radio-over-Fiber (RoF). In this paper, we present the simulation results of the bit error rate (BER), and analyze the performance improvement by RCWL in detail.
{"title":"BPSK-SIM free-space optical communication with reference continuous wave light","authors":"Shuchao Zhang, Xiaodi You, Zhu Hua, Yulong Wang","doi":"10.1109/ICOCN.2014.6987141","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987141","url":null,"abstract":"Free space optical (FSO) communication technology has received significant attention because of its advantages, including free spectrum license, secure transmission, high capacity and low deployment cost. However, optical beams carried with information could be absorbed or scattered during transmission through atmosphere, that makes attenuation and fluctuation to be the main challenges for FSO system, and lots of researches have been done to improve the performance. Recently, we have investigated the reference continuous wave light (RCWL) assisted detection technique in BPSK subcarrier intensity modulated (SIM) free-space optical communication system which can be a supplementary technology for Radio-over-Fiber (RoF). In this paper, we present the simulation results of the bit error rate (BER), and analyze the performance improvement by RCWL in detail.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130502579","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 : 2014-12-18DOI: 10.1109/ICOCN.2014.6987108
Xiaoli Yin, Ji Hao, Jing-jing Han, Can Xu, X. Xin, Li Li, Chongxiu Yu
We propose a method to generate vortex beam with sidelobe suppression by adding an axicon before the spiral phase plate (SPP). In this paper, the far-field diffraction model of the SPP is theoretically analyzed in detail. The numerical simulation results show that the quality of the generated beam which carries the orbital angular momentum is improved dramatically. What's more, we also study the effect of the radius of the annular beam on the performance of sidelobe suppression.
{"title":"Sidelobe suppression in the generation of beam carrying orbital angular momentum","authors":"Xiaoli Yin, Ji Hao, Jing-jing Han, Can Xu, X. Xin, Li Li, Chongxiu Yu","doi":"10.1109/ICOCN.2014.6987108","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987108","url":null,"abstract":"We propose a method to generate vortex beam with sidelobe suppression by adding an axicon before the spiral phase plate (SPP). In this paper, the far-field diffraction model of the SPP is theoretically analyzed in detail. The numerical simulation results show that the quality of the generated beam which carries the orbital angular momentum is improved dramatically. What's more, we also study the effect of the radius of the annular beam on the performance of sidelobe suppression.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122239729","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 : 2014-12-18DOI: 10.1109/ICOCN.2014.6987073
Z. Pan, Y. Weng, Xuan He
Nonlinear effects in few-mode fibers (FMF) have been explored in the early years of optical communication. Due to the development of space-division multiplexing (SDM) technology for fiber transmission in FMF, the nonlinearity in FMF has attracted significant research interests recently. Analogous to single-mode fiber, nonlinear effects may eventually limit the information capacity in FMF transmission systems. In this paper, we first reviewed the past and current research in this area. The paper then concentrates on the theoretical and numerical investigation of inter-modal four-wave mixing (IM-FWM) among up to four spatial modes in FMFs. Different forms of multi-mode non-linear Schrödinger equation (MM-NLSE) for two, three and four spatial modes are derived, along with up to twelve types of wave/mode distributions and their corresponding phase matching conditions. We analyze the mixed effects of differential mode group delay (DMGD), chromatic dispersion (CD), random mode coupling (RMC) and wavelength separation upon IM-FWM efficiency in FMF. In addition, intermodal nonlinear effects in FMFs may potentially provide a variety of innovative optical signal processing functionality for fiber network applications through this additional spatial dimension. For example, we show simultaneous mode and wavelength conversion based on IM-FWM, and explore the effects of group velocity dispersions in order to achieve higher conversion efficiency.
{"title":"Investigation of the nonlinearity in few mode fibers","authors":"Z. Pan, Y. Weng, Xuan He","doi":"10.1109/ICOCN.2014.6987073","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987073","url":null,"abstract":"Nonlinear effects in few-mode fibers (FMF) have been explored in the early years of optical communication. Due to the development of space-division multiplexing (SDM) technology for fiber transmission in FMF, the nonlinearity in FMF has attracted significant research interests recently. Analogous to single-mode fiber, nonlinear effects may eventually limit the information capacity in FMF transmission systems. In this paper, we first reviewed the past and current research in this area. The paper then concentrates on the theoretical and numerical investigation of inter-modal four-wave mixing (IM-FWM) among up to four spatial modes in FMFs. Different forms of multi-mode non-linear Schrödinger equation (MM-NLSE) for two, three and four spatial modes are derived, along with up to twelve types of wave/mode distributions and their corresponding phase matching conditions. We analyze the mixed effects of differential mode group delay (DMGD), chromatic dispersion (CD), random mode coupling (RMC) and wavelength separation upon IM-FWM efficiency in FMF. In addition, intermodal nonlinear effects in FMFs may potentially provide a variety of innovative optical signal processing functionality for fiber network applications through this additional spatial dimension. For example, we show simultaneous mode and wavelength conversion based on IM-FWM, and explore the effects of group velocity dispersions in order to achieve higher conversion efficiency.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116216205","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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