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    • 7. 发明专利
    • Optical fiber line testing system and an optical line test method
    • JP5291908B2
    • 2013-09-18
    • JP2007230611
    • 2007-09-05
    • 日本電信電話株式会社
    • 晃次 圓佛則幸 荒木裕司 東
    • G01M11/00
    • PROBLEM TO BE SOLVED: To provide inexpensively an optical line test system and an optical line test method capable of measuring individually the state of a branch fiber on the downstream of an optical splitter. SOLUTION: In this optical branch line system equipped with the optical splitter 14 for branching an optical line 13 into, for example, four systems, each FBG filter 20 is connected to each branch fiber 15. Each FBG filter 20 reflects light having each specific wavelength, and each reflected wavelength is presented as λ1-λ4. An OTDR (Optical Time Domain Reflectometer)18 is connected to the optical line 13, and an OTDR waveform is acquired individually by a test optical pulse having each wavelength λ1-λ4. In the OTDR waveform, a waveform showing back scattered light of test light reflected by the FBG filter 20 specifies a wavelength showing a characteristic shape. For example, if a waveform showing the back scattered light of the test light reflected by the FBG filter 20 does not exist in the OTDR waveform, it is concluded that a branch fiber 15 to which the FBG filter 20 reflecting the corresponding wavelength is connected is broken. COPYRIGHT: (C)2009,JPO&INPIT