We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF betwe...We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF between two pieces of multimode fiber(MMF)and single-mode fiber(SMF)at the ends of the MMF as lead-in and lead-out.Due to the first segment of the MMF,the transmitted light is coupled into the ring core,silica center,and cladding of the RCF,exciting multiple modes in the RCF.By the modal interferences in the structure,bending sensing can be realized by interrogating the intensity of the interference dip.Experimental results show a high bending sensitivity of-25.63 dB/m^(-1)in the range of 1.0954 m^(-1)to1.4696 m^(-1).In addition,the advantages of the bend sensor,such as small size,low temperature sensitivity,and simple fabrication process,can be used for curvature measurement in building health monitoring.展开更多
Much attention has been focused on the use of scalar modes for space division multiplexing （SDM）. Alternative vector mode bases offer another solution set for SDM, expanding the available trade-offs in system perfor...Much attention has been focused on the use of scalar modes for space division multiplexing （SDM）. Alternative vector mode bases offer another solution set for SDM, expanding the available trade-offs in system performance and complexity. We present two types of ring core fiber conceived and designed to explore SDM with fibers exhibiting low interactions between supported modes. We review demonstrations of fiber data transmis- sion tbr two separate vector mode bases： one for orbital angular momentum （OAM） modes and one for linearly polarized vector （LPV） modes. The OAM mode demon- strations include short transmissions using commercially available transceivers, as well as kilometer length transmission at extended data rates. The LPV demonstra- tions span kilometer length transmissions at high data rate with coherent detection, as well as a radio over fiber experiment with direct detection of narrowband signals.展开更多
基金supported by the National Key R&D Program of China(No.2018YFB1800903)the National Natural Science Foundation of China(No.62005052)+2 种基金the Guangdong Introducing Innovative and Entrepreneurial Teams of“The Pearl River Talent Recruitment Program”(No.2019ZT08X340)the Guangdong Provincial Key Laboratory of Photonics Information Technology(No.2020B121201011)the Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education(Beijing Jiaotong University)(No.AON2019002)。
文摘We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber(RCF)modal interferometer.The sensor was fabricated by splicing a segment of RCF between two pieces of multimode fiber(MMF)and single-mode fiber(SMF)at the ends of the MMF as lead-in and lead-out.Due to the first segment of the MMF,the transmitted light is coupled into the ring core,silica center,and cladding of the RCF,exciting multiple modes in the RCF.By the modal interferences in the structure,bending sensing can be realized by interrogating the intensity of the interference dip.Experimental results show a high bending sensitivity of-25.63 dB/m^(-1)in the range of 1.0954 m^(-1)to1.4696 m^(-1).In addition,the advantages of the bend sensor,such as small size,low temperature sensitivity,and simple fabrication process,can be used for curvature measurement in building health monitoring.
文摘Much attention has been focused on the use of scalar modes for space division multiplexing （SDM）. Alternative vector mode bases offer another solution set for SDM, expanding the available trade-offs in system performance and complexity. We present two types of ring core fiber conceived and designed to explore SDM with fibers exhibiting low interactions between supported modes. We review demonstrations of fiber data transmis- sion tbr two separate vector mode bases： one for orbital angular momentum （OAM） modes and one for linearly polarized vector （LPV） modes. The OAM mode demon- strations include short transmissions using commercially available transceivers, as well as kilometer length transmission at extended data rates. The LPV demonstra- tions span kilometer length transmissions at high data rate with coherent detection, as well as a radio over fiber experiment with direct detection of narrowband signals.
