| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for evaluating the effective Raman gain coefficient of a single mode optical fiber, capable of evaluating an effective Raman gain coefficient of the single mode optical fiber from one end and simply in an optical fiber transmission path constituted of the single mode optical fiber. SOLUTION: The evaluation device of the effective Raman gain coefficient of the single mode optical fiber comprises: a back scattering light intensity measuring instrument 11 which measures back scattering light intensity S1(λ, z, P<SB>p1</SB>) at an arbitrary position z of the single mode optical fiber 16 when excitation light power P<SB>p1</SB>of wavelengthλp and OTDR light of wavelengthλare multiplexed and made incident on a single mode optical fiber transmission path 16 by a WDM coupler and the back scattering light intensity S2(λ, z, P<SB>p2</SB>) when changing the excitation light power into P<SB>p2</SB>; and an analyzing device and/or an adjusting computer device which calculates the effective Raman gain coefficient of the single mode optical fiber 16 by using the difference between both back scattering light intensities, the loss coefficient at excitation light wavelengthλp and the difference (P<SB>p1</SB>-P<SB>p2</SB>) of the excitation powers. COPYRIGHT: (C)2008,JPO&INPIT
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