With a Rotary Sets fiber pigtailed electro-optic modulator as the active Q-switch, mode-hopping-free single-longitudinal-mode pulses are generated by a ring cavity fiber laser based on the injection seeding technique.The experimental results show that the single-longitudinal-mode oscillating properties of the laser may be determined by the power an

In order to provide a constant and complete operational picture of the maritime situation in the Exclusive Economic Zone (EEZ) at over the horizon (OTH) distances, a network of high frequency surface-wave-radars (HFSWR) slowly becomes a necessity.Since each HFSWR in the network tracks all the targets it detects independently of other radars in the