EVALUATION METHOD AND EVALUATION DEVICE OF RAMAN GAIN EFFICIENCY DISTRIBUTION OF SINGLE MODE OPTICAL FIBER TRANSMISSION LINE

摘要

PROBLEM TO BE SOLVED: To provide an evaluation method and an evaluation device of a Raman gain efficiency distribution of a single mode optical fiber capable of evaluating simply from one side, the Raman gain efficiency distribution of an optical fiber transmission line constituted of the single mode optical fiber. SOLUTION: This device has a back scattered light intensity measuring device 11 for measuring the back scattered light intensity S(λ, z, PP) on an optional position z of the single mode optical fiber 16 when excitation light power PPhaving a wavelengthλPand OTDR light having a wavelengthλare coupled together by a WDM coupler and allowed to enter a single mode optical fiber transmission line 16, and S(λ, z, 0) in the case of no excitation power; and a back scattered light intensity waveform analyzer 12 for operating the Raman gain efficiency of the single mode optical fiber 16 by using a first-order differential coefficient at the position z and a loss coefficient of an excitation light wavelengthλPfrom the back scattered light intensity difference thereof. COPYRIGHT: (C)2009,JPO&INPIT