We propose U nove1,fubricutioii method to suppress PDL oflong-peviod,fiber gruting~s by rotating esposure technique. with U theoreticul considerution ofthe PDL origins ofIoiig-j,eriod,fiher grutiizgs.
The nonlinear refractive index coefficient n2 dependence on the GeO, concentration in optical fibers is quantitatively shown for SiO, core fibers and Ge0,-Si02 core/Si02 clad fibers with A = 0.35-2.2% using an XPM measurement method where the phase change in the fiber of a probe signal caused by a pump signal is found from' the delay self-heterodyne spectrum. The GeO, concentration distribution which determines the n2 distribution in the fiber is not uniform, and the measured % is the average of the product of the local n2 and the fourth power of the electric field in the fiber. In this work, this relationship of the measured n,, the cross sectional distribution of %, and the electric field distribution in the fiber is used to define an effective GeO, concentration, qew This effective GeO, concentration level is used to evaluate n2. The measured % increases proportionally to qefi by the relationship %[x 10-20 m2/w1 = 0.0552q,~[mol~] + 2.44.Furthermore, the measured n2 in the fiber agrees well with the of bulk glass obtained a semiempiridy for the nonlinear refractive index coefficient derived from linear refractive index data.
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