Compositional effects on the radiation response of Ge-doped silica-core optical fiber waveguides.

The effect of variations in the Ge, B, P, and OH content on the radiation response of Ge-doped silica-core optical fiber waveguides has been measured at 0.82 and 1.3 microm. It has been established that variations in neither OH content nor Ge concentration affect the response of these fibers. B doping increases the loss at short times following pulsed irradiation, whereas P suppresses the intense Ge-related transient absorption at both 0.82 and 1.3 microm while inhibiting long-term recovery. Since there is a minimum in the induced loss near 1.1-1.2 microm in P-doped fibers, the damage at 1.55 microm is significantly higher than that at 1.3 microm.