Pub Date : 2014-12-18DOI: 10.1109/ICOCN.2014.6987142
Minghua Cao, Jianqiang Li, Feifei Yin, Yitang Dai, Kun Xu
The performance of using bandpass sampling technique in optical phase-modulated and coherent detection (PM-CD) radio-over-fiber (RoF) links is analyzed. Additionally, a method to select aliasing-free bandpass sampling frequency is derived. This method is suitable for subcarrier multiplexing (SCM) scenario with the presence of independent free-running optical local oscillator (LO) caused frequency offset. Analytical assessment and simulations are used to determine the ultimate performance with respect to ADC bits resolution and laser linewidth. The simulation result shows that 8 bit resolution and narrow laser linewidth (less than 100kHz) are expected to achieve high performance link for undersampling applications in the PM-CD RoF links.
{"title":"Digital coherent detection with bandpass sampling in multiband phase-modulated radio-over-fiber links","authors":"Minghua Cao, Jianqiang Li, Feifei Yin, Yitang Dai, Kun Xu","doi":"10.1109/ICOCN.2014.6987142","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987142","url":null,"abstract":"The performance of using bandpass sampling technique in optical phase-modulated and coherent detection (PM-CD) radio-over-fiber (RoF) links is analyzed. Additionally, a method to select aliasing-free bandpass sampling frequency is derived. This method is suitable for subcarrier multiplexing (SCM) scenario with the presence of independent free-running optical local oscillator (LO) caused frequency offset. Analytical assessment and simulations are used to determine the ultimate performance with respect to ADC bits resolution and laser linewidth. The simulation result shows that 8 bit resolution and narrow laser linewidth (less than 100kHz) are expected to achieve high performance link for undersampling applications in the PM-CD RoF links.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"43 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":"122034692","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.2014.6987101
X. Yi, Dengke Zeng, Xuemei Chen, J. Zhang, K. Qiu
We have recently demonstrated the improved phase noise tolerance in coherent optical OFDM by digital coherent superposition of optical OFDM subcarriers, which are phase-conjugated pairs with Hermitan symmetry. In this approach, we realized DCS of OFDM subcarriers in single polarization (or channel), denoted as SP-DCS-OFDM. In this paper, we show that another approach is in dual polarizations, or DP-DCS-OFDM. We prove that both approaches can reduce the ICI due to phase noise, including laser phase noise and nonlinear phase noise. We discuss their improved phase noise tolerance in simulation. We also discuss their difference in terms of complexity and performance.
{"title":"Improved phase noise tolerance using phase-conjugated OFDM subcarriers","authors":"X. Yi, Dengke Zeng, Xuemei Chen, J. Zhang, K. Qiu","doi":"10.1109/ICOCN.2014.6987101","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987101","url":null,"abstract":"We have recently demonstrated the improved phase noise tolerance in coherent optical OFDM by digital coherent superposition of optical OFDM subcarriers, which are phase-conjugated pairs with Hermitan symmetry. In this approach, we realized DCS of OFDM subcarriers in single polarization (or channel), denoted as SP-DCS-OFDM. In this paper, we show that another approach is in dual polarizations, or DP-DCS-OFDM. We prove that both approaches can reduce the ICI due to phase noise, including laser phase noise and nonlinear phase noise. We discuss their improved phase noise tolerance in simulation. We also discuss their difference in terms of complexity and performance.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"32 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":"131078068","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.2014.6987091
G. Cong, T. Matsukawa, T. Chiba, H. Tadokoro, M. Yanagihara, M. Ohno, H. Kuwatsuka, Y. Igarashi, M. Masahara, H. Ishikawa, S. Namiki, H. Kawashima
This invited talk will review our work on the monolithic integration of the MOSFET and the thermo-optic (TO) based Mach-Zehnder switch (MZS) using the front-end process on the photonic SOI platform. This MOSFET was capable of driving the TO phase shifter because of its large current capability. By tuning the gate voltage of the MOSFET, the switching state of MZS was successfully controlled. We will also present our work on the robust switch design with the intention to minimize the negative influences on switching performance due to so many MOSFET process steps. For this purpose, we had proposed a new 3dB directional coupler which was more robust to the gap variation than the conventional one. Our monolithic MOSFET is promising in simplifying the driver circuits and in developing on-chip drivers for TO-based silicon photonics devices.
{"title":"Monolithically integrated MOSFET for controlling silicon optical switch: Is an on-chip transistor capable of driving a thermo-optic phase shifter?","authors":"G. Cong, T. Matsukawa, T. Chiba, H. Tadokoro, M. Yanagihara, M. Ohno, H. Kuwatsuka, Y. Igarashi, M. Masahara, H. Ishikawa, S. Namiki, H. Kawashima","doi":"10.1109/ICOCN.2014.6987091","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987091","url":null,"abstract":"This invited talk will review our work on the monolithic integration of the MOSFET and the thermo-optic (TO) based Mach-Zehnder switch (MZS) using the front-end process on the photonic SOI platform. This MOSFET was capable of driving the TO phase shifter because of its large current capability. By tuning the gate voltage of the MOSFET, the switching state of MZS was successfully controlled. We will also present our work on the robust switch design with the intention to minimize the negative influences on switching performance due to so many MOSFET process steps. For this purpose, we had proposed a new 3dB directional coupler which was more robust to the gap variation than the conventional one. Our monolithic MOSFET is promising in simplifying the driver circuits and in developing on-chip drivers for TO-based silicon photonics devices.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"14 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":"131119707","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.2014.6987061
G. Lu, T. Sakamoto, T. Kawanishi
With the recent trend of employing spectrally efficient multi-level modulation formats in optical communication systems, it is highly desirable to exploit the all-optical wavelength conversion (AOWC) schemes for formats, such as 16- or 64-quadrature amplitude modulation (QAM) signals. Since the linear and nonlinear phase noise is transferred with the data to the converted wavelength in AOWC subsystem, it is imperative to optimize the operation condition in AOWC to suppress noise to allow compatibility phase-noise sensitive high-order QAM formats. We first investigate the performance optimization of AOWC for high-order QAMs like 64QAM through four-wave mixing in highly nonlinear fiber, and then discuss our proposed AOWCs schemes for high-order QAM signals such as 16/64-QAM using coherent pumps which is free of phase noise from pumps.
{"title":"Wavelength conversion of high-order QAM signals for future transparent all-optical networks","authors":"G. Lu, T. Sakamoto, T. Kawanishi","doi":"10.1109/ICOCN.2014.6987061","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987061","url":null,"abstract":"With the recent trend of employing spectrally efficient multi-level modulation formats in optical communication systems, it is highly desirable to exploit the all-optical wavelength conversion (AOWC) schemes for formats, such as 16- or 64-quadrature amplitude modulation (QAM) signals. Since the linear and nonlinear phase noise is transferred with the data to the converted wavelength in AOWC subsystem, it is imperative to optimize the operation condition in AOWC to suppress noise to allow compatibility phase-noise sensitive high-order QAM formats. We first investigate the performance optimization of AOWC for high-order QAMs like 64QAM through four-wave mixing in highly nonlinear fiber, and then discuss our proposed AOWCs schemes for high-order QAM signals such as 16/64-QAM using coherent pumps which is free of phase noise from pumps.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"13 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":"116293526","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.2014.6987146
Bangjiang Lin, Juhao Li, Y. Wan, Yongqi He, Zhangyuan Chen
We propose a polarization division multiplexing (PDM) WDM-PON architecture based on intensity modulation and coherent detection. Single carrier frequency domain equalization (SCFDE) technique is used to effectively combat the linear distortion. And 2×2 multiple inputs multiple outputs (MIMO) algorithm is used to remove the crosstalk between the two orthogonal polarizations. 20-Gb/s PDM-BPSK transmission over 50-km SSMF is experimentally demonstrated.
{"title":"Experimental demonstration of 20-GB/S PDM upstream transmission using intensity modulator and SCFDE for coherent WDM-PON","authors":"Bangjiang Lin, Juhao Li, Y. Wan, Yongqi He, Zhangyuan Chen","doi":"10.1109/ICOCN.2014.6987146","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987146","url":null,"abstract":"We propose a polarization division multiplexing (PDM) WDM-PON architecture based on intensity modulation and coherent detection. Single carrier frequency domain equalization (SCFDE) technique is used to effectively combat the linear distortion. And 2×2 multiple inputs multiple outputs (MIMO) algorithm is used to remove the crosstalk between the two orthogonal polarizations. 20-Gb/s PDM-BPSK transmission over 50-km SSMF is experimentally demonstrated.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"126 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":"116545400","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.2014.6987059
Jian Zhao
In this paper, we review the multicarrier technology using offset quadrature amplitude modulation (QAM) for optical communication systems and networks. We investigate the orthogonality condition of this technology and discuss its electronic and optical domain implementation. It is shown that discrete-Fourier-transform based offset-QAM orthogonal frequency division multiplexing (OFDM) can greatly relax the required length of guard interval for dispersion compensation compared to conventional OFDM, and reduce the implementation complexity compared to Nyquist FDM. Optically-multiplexed offset-QAM super-channels exhibit improved performance, and relaxed device specifications for minimizing inter-channel crosstalk compared to all-optical OFDM and Nyquist WDM.
{"title":"Offset-QAM multicarrier technology for optical systems and networks (Invited)","authors":"Jian Zhao","doi":"10.1109/ICOCN.2014.6987059","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987059","url":null,"abstract":"In this paper, we review the multicarrier technology using offset quadrature amplitude modulation (QAM) for optical communication systems and networks. We investigate the orthogonality condition of this technology and discuss its electronic and optical domain implementation. It is shown that discrete-Fourier-transform based offset-QAM orthogonal frequency division multiplexing (OFDM) can greatly relax the required length of guard interval for dispersion compensation compared to conventional OFDM, and reduce the implementation complexity compared to Nyquist FDM. Optically-multiplexed offset-QAM super-channels exhibit improved performance, and relaxed device specifications for minimizing inter-channel crosstalk compared to all-optical OFDM and Nyquist WDM.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"60 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":"132230948","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}
Next generation passive optical network (NG-PON), which aims at providing cost-effective solutions to the ever-increasing bandwidth demand of the end-customers with data rate of 100-Gb/s, is attracting more and more attentions. In this paper, a symmetric 100-Gb/s DSP-enhanced TWDM-PON architecture with four pairs of wavelengths is proposed. 4×25-Gb/s TWDM-OFDM-PON is experimentally demonstrated over 26.7 km fiber using double sideband (DSB) modulation. The employment of RSOA is also investigated to enhance the receiver sensitivity.
{"title":"DSP-enhanced TWDM-PON with DSB modulation towards 100-GB/S","authors":"Juhao Li, Bangjiang Lin, Yongqi He, Zhangyuan Chen","doi":"10.1109/ICOCN.2014.6987100","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987100","url":null,"abstract":"Next generation passive optical network (NG-PON), which aims at providing cost-effective solutions to the ever-increasing bandwidth demand of the end-customers with data rate of 100-Gb/s, is attracting more and more attentions. In this paper, a symmetric 100-Gb/s DSP-enhanced TWDM-PON architecture with four pairs of wavelengths is proposed. 4×25-Gb/s TWDM-OFDM-PON is experimentally demonstrated over 26.7 km fiber using double sideband (DSB) modulation. The employment of RSOA is also investigated to enhance the receiver sensitivity.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"61 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":"114950334","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 : 2014-11-01DOI: 10.1109/ICOCN.2014.6987104
N. Fontaine
The adoption and success of space-division multiplexing (SDM) depends on highly integrated and cost effective devices and components. We compare the strengths and weaknesses of SDM components including silicon photonics, 3D waveguides, all-fiber devices, and bulk-optics wavelength selective switches.
{"title":"Integrated photonics and components for space-division multiplexing systems","authors":"N. Fontaine","doi":"10.1109/ICOCN.2014.6987104","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987104","url":null,"abstract":"The adoption and success of space-division multiplexing (SDM) depends on highly integrated and cost effective devices and components. We compare the strengths and weaknesses of SDM components including silicon photonics, 3D waveguides, all-fiber devices, and bulk-optics wavelength selective switches.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129885745","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 : 2014-11-01DOI: 10.1109/ICOCN.2014.6987109
Xiaozhong Ge, Fangzheng Zhang, S. Pan
A novel approach to generating an optical frequency comb (OFC) based on stimulated Brillouin scattering (SBS) in optical fiber is proposed using a stocks wave recycling loop. Thanh to the stocks wave recycling loop, the SBS threshold is reduced and the SBS conversion efficiency is greatly improved, leading to increased number and enhanced flatness of the generated comb lines. An experiment is carried out. An OFC with a frequency spacing of 9.5 GHz is generated. The comb line number is increased from 6 to 9 by using the stocks wave recycling loop, and the flatness is also significantly improved. In addition, the self-lasing cavity modes are well suppressed.
{"title":"Stimulated Brillouin scattering based optical frequency comb generation using a stocks wave recycling loop","authors":"Xiaozhong Ge, Fangzheng Zhang, S. Pan","doi":"10.1109/ICOCN.2014.6987109","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987109","url":null,"abstract":"A novel approach to generating an optical frequency comb (OFC) based on stimulated Brillouin scattering (SBS) in optical fiber is proposed using a stocks wave recycling loop. Thanh to the stocks wave recycling loop, the SBS threshold is reduced and the SBS conversion efficiency is greatly improved, leading to increased number and enhanced flatness of the generated comb lines. An experiment is carried out. An OFC with a frequency spacing of 9.5 GHz is generated. The comb line number is increased from 6 to 9 by using the stocks wave recycling loop, and the flatness is also significantly improved. In addition, the self-lasing cavity modes are well suppressed.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"518 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123113613","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 : 2014-11-01DOI: 10.1109/ICOCN.2014.6987130
Bo Zhang
Next generation coherent optical communication systems can potentially employ new architectures such as colorless, filterless, gridless and highly-sensitive features. This paper discusses and demonstrates advanced receiver design that is targeted for such applications.
{"title":"Advanced receiver design for next generation coherent optical system","authors":"Bo Zhang","doi":"10.1109/ICOCN.2014.6987130","DOIUrl":"https://doi.org/10.1109/ICOCN.2014.6987130","url":null,"abstract":"Next generation coherent optical communication systems can potentially employ new architectures such as colorless, filterless, gridless and highly-sensitive features. This paper discusses and demonstrates advanced receiver design that is targeted for such applications.","PeriodicalId":364683,"journal":{"name":"2014 13th International Conference on Optical Communications and Networks (ICOCN)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125069148","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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