The mechanically-induced phase-shifted long period fiber grating(PS-LPFG) is formed by pressing a single mode fiber from double sides with two identical periodically phase-shifted grooved plates.The influence of pressure applied on the fiber and the number Nof the π phase-shifts on the transmission spectrum of the PS-LPFG is investigated experimentally.The results show that the depth of the notch of the PS-LPFG can be determined by adjusting the pressure,and a peak transmission loss of-30 dB for...