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Domains of integration highlighted in yellow and light blue where the conditions of r(τ − χ/β) = r0 and r(τ + χ/β) = r0 are satisfied, respectively. ξ1 = β(τ − τi) and ξ2 = β(τe − τ). Their overlapping domain is shaded in green. β is the sweep rate of the angular frequency of the employed tunable laser output, τi and τe are round trip times from the origin at τ = 0 to the input and output ends of the fiber under test, respectively.
