Dual frequency probe based coherent optical time domain reflectometry |
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| Authors: | Lidong Lu Yuejiang Song Fan Zhu Xuping Zhang |
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| Institution: | 1. Center for Telecommunications Studies, CETUC, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil;2. Ericsson Research, Ericsson AB, Stockholm 164-83, Sweden;3. KTH Royal Institute of Technology, The School of ICT, Electrum 229,164 40 Kista, Sweden;4. Department of Electrical Engineering, Federal University of Pará, Belém, PA 66.075-900, Brazil;1. Department of Opto-Electronics Engineering, School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China;2. Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute of Shandong Academy of Sciences, Jinan, Shandong 250014, China;3. School of Electrical Engineering & Telecommunications, The University of New South Wales, NSW 2052, Australia;1. Institute of Optical Communication Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China;2. Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China;3. Key Laboratory of Advanced Transducers and Intelligent Control Systems, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | A new approach to enhance the performance of coherent optical time domain reflectometry(C-OTDR) is proposed. In this approach, single frequency light is converted to multi-frequency light using phase modulator (PM), while only two frequencies with the same light power level are adopted as the probe .Coherent heterodyne between the dual frequency probe and original single frequency local oscillator (LO) generates the same intermediate frequency (IF), which equals two IF signals automatically synthesizing in the process of coherent detection other than in IF signal processing circuit, so it doubles measurement speed. Experimental results show that compared with conventional single frequency probe based C-OTDR the dual frequency probe based C-OTDR has more quickly coherent Rayleigh noise (CRN) reduction capability and can bring a 3.0 dB dynamic range improvement. |
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