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利用周期为600μm的刻槽板,采用单面受压的方式包层对经过HF溶液腐蚀后的单模光纤施加压力,形成机械写制长周期光纤光栅(LPFG)。通过测量具有不同包层直径的机械写制LPFG在各种压力下的透射光谱,研究包层直径对纤芯基模与包层模LP12、LP13间耦合特性的影响。实验结果表明,随着包层直径的减小,谐振波长发生红移,耦合系数增大;当包层直径大于107μm时,LP13先于LP12发生过耦合;当包层直径小于107μm时,情况相反。说明腐蚀包层是提高机械LPFG中纤芯基模与包层模间耦合效率的有效方法。
Using a grooved plate with a period of 600 μm, the single-mode fiber corroded by the HF solution is clad by a one-sided compression method to form a mechanical written long-period fiber grating (LPFG). The influence of the cladding diameter on the coupling characteristics between the core and cladding modes LP12 and LP13 was investigated by measuring the transmission spectra of mechanically written LPFG with different cladding diameters under various pressures. Experimental results show that as the cladding diameter decreases, the resonant wavelength shifts red and the coupling coefficient increases. When the cladding diameter is larger than 107μm, LP13 pre-LP12 is over-coupled. When the cladding diameter is less than 107μm, . Corrosion cladding is an effective way to improve the coupling efficiency between core mode and cladding mode in mechanical LPFG.