Continuous wave generated nanosecond electrical and optical pulses from photorefractive lithium niobate fibers

We have observed nanosecond electrical and optical pulsations from photorefractive lithium-niobate optical fibers using low-power lasers (/spl sim/=532 nm). Fourier spectra of the pulsations have a maximum at /spl sim/900 MHz with peaks separated by /spl sim/30 MHz.