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中文摘要：
利用两个交替放置的周期性刻槽板对单模光纤（SMF）施力，形成了机械微弯长周期光纤光栅（LPFG）。实验研究了LPFG的偏振相关损耗（PDL）、刻槽板空间周期和压力等参数对透射谱的影响。结果表明，压力可改变LPFG的透射谱特性，最大损耗峰值可达24．6dB；在1551．9nm处，LP13包层模的最大PDL约为7．42dB，谐振波长分离值约为1．9nm，优于采用类似法在边孔SMF里写入的LPFG。
英文摘要：
The mechanically-induced long period fiber grating （LPFG） is formed by pressing a single mode fiber from double sides with two identical periodically grooved plates. The polarization dependent loss （PDL） of the LPFG is investigated experimentally, together with effects of the spacing period of the grooved plates and the pressure on the transmission spectrum. The results show that the characteristics of the LPFG can be modified by adjusting the pressure and a peak transmission loss of 24.6 dB has been achieved. A maximum PDL of 7.42 dB at 1 551.9 nm for LP13 cladding mode and the resonance wave- length separation of 1.9 nm are measured,which are superior to the inscription of a LPFG in a side-hole single mode fiber with a similar fabrication method.
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