Abstract

Light-induced refractive-index change in Er3+−Ge-doped optical fiber is reported for the first time to the authors' knowledge. Evidence of the change is observed when UV light (λ = 249 nm) irradiates one arm of an unbalanced Mach–Zehnder interferometer made from Er3+−Ge-doped fiber. From a measurement of the change in the spectral response of the interferometer with UV exposure, the change in fiber core index as a function of wavelength is determined. The equilibrium change in core index is found to vary between 2.3 × 10−5 and 3.7 × 10−5 over the measured wavelength region of 800 to 1700 nm. Also for the first time to our knowledge, fused couplers made of Er3+-doped fiber are reported. These identical fiber couplers are used in a novel all-fiber unbalanced Mach–Zehnder interferometer.

© 1990 Optical Society of America

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