Measurement of the pump-induced phase change in Yb/sup 3+//Al/sup 3+/ co-doped optical fibers using a long-period fiber grating pair

摘要

Summary form only given. We proposed a new measurement method for the nonlinear optical (NLO) property of the Yb/sup 3+//Al/sup 3+/ co-doped optical fibers with low cost, high reliability, and simple measurement setup. A long-period fiber grating (LPG) pair was used as a sensing part of the NLO property measurement together with the target fiber spliced between the pair. The pump-induced phase change of the Yb/sup 3+//Al/sup 3+/ co-doped fibers was measured and the effect of fiber length on the NLO property was investigated. The measured phase change of the Yb/sup 3+//Al/sup 3+/ co-doped fiber around 1580 nm upon pumping with laser diode was found to increase and saturate with increase of the pump power.