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利用两个相同且交替放置的周期性相移锯齿槽对单模光纤(SMF)施力,形成了基于机械微弯力学效应的多个π相移长周期光纤光栅(π-PS-LPFG)。实验研究了压力和π相移个数对光栅光谱的影响。结果表明,在1420～1440nm、1475～1500nm和1536～15709nm的波长范围内相移光栅光谱分别呈现出带通特性,阻带出现在通带两侧;相移光栅光谱的凹谷深度由压力确定,LP12模的最大损耗峰值可达-30dB;两损耗峰间的间距取决于π相移个数。本文方法操作简单,容易控制,使π-PS-LPFG的制作更加灵活。
A number of π-phase extended-period fiber gratings (π-PS-LPFGs) based on mechanical micro-bending mechanical effects were formed by using two identical and alternating periodic phase jagged slots to apply SMF. The effects of pressure and π phase shift on the grating spectra were experimentally studied. The results show that the phase shift grating spectra show bandpass characteristics in the wavelength range of 1420 ~ 1440nm, 1475 ~ 1500nm and 1536 ~ 15709nm, respectively. The stop bands appear on both sides of the passband. The valley depth of the phase shift grating is determined by the pressure , LP12 mode maximum loss peak up to-30dB; loss interval between two peaks depends on the number of π phase shift. This method is simple and easy to control, making π-PS-LPFG more flexible.