| Presentation | 2005-08-25 High-accuracy high-speed optical reflectometry by synthesis of optical coherence function with adaptive carrier Xinyu Fan, Zuyuan He, Kazuo Hotate, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In fiber optic manufacturing, troubleshooting for fiber optic assembly modules is a long-time headache. To use an optical reflectometry in this application, ～10-cm spatial resolution, 10～100-m distance measurement range, ～0.1-dB reflectance resolution, and short measurement time are required. Based on the technique of synthesis of optical coherence function (SOCF), we have developed an optical reflectometry, which synthesizes and scans a coherence peak along the device under test (DUT) to obtain distributed reflection and backscattering information. To decrease the fading noise caused by interference of multiple-reflection and Rayleigh backscattering in the fiber, frequency shift averaging technique (FSAV) was introduced into SOCF to enhance the reflectance accuracy. Furthermore, by applying continuous sweeping of the center wavelength and continuous integration into SOCF, high-accuracy and high-speed measurement has been realized simultaneously. In this method, when we scan the synthesized coherence peak along the DUT, the heterodyne detection carrier frequency changes because of the center frequency sweeping. In this presentation, we propose and demonstrate a novel system that sweeps the center frequency of the bandpass filter (BPF) in photodetection adaptively in accordance with the carrier frequency change accompanying the scanning the coherence peak along the DUT. The new method also decreases the sidelobes in SOCF. We demonstrated that the dynamic range of the new adaptive reflectometry system is improved ～20dB. By using the continuous frequency sweeping averaging, the standard deviation of the fading noise is reduced to 0.022dB. Also, the measuring time for measuring 50-m DUT at the resolution of 10cm is improved to less than 1 minute. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | synthesis of optical coherence function / adaptive carrier / optical reflectometry |
| Paper # | OFT2005-18 |
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| Conference Information | |
| Committee | OFT |
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| Conference Date | 2005/8/18(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Optical Fiber Technology (OFT) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | High-accuracy high-speed optical reflectometry by synthesis of optical coherence function with adaptive carrier |
| Sub Title (in English) | |
| Keyword(1) | synthesis of optical coherence function |
| Keyword(2) | adaptive carrier |
| Keyword(3) | optical reflectometry |
| 1st Author's Name | Xinyu Fan |
| 1st Author's Affiliation | Department of Electronics Engineering, School of Engineering, The University of Tokyo() |
| 2nd Author's Name | Zuyuan He |
| 2nd Author's Affiliation | Department of Electronics Engineering, School of Engineering, The University of Tokyo |
| 3rd Author's Name | Kazuo Hotate |
| 3rd Author's Affiliation | Department of Electronics Engineering, School of Engineering, The University of Tokyo |
| Date | 2005-08-25 |
| Paper # | OFT2005-18 |
| Volume (vol) | vol.105 |
| Number (no) | 242 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |