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采用改进的全矢量有效折射率法和耦合模理论,研究了光子晶体光纤布拉格光栅长度、占空比、光栅周期与慢光的变化规律。结果表明当光栅长度和光栅周期不变时,随着包层空气孔占空比的增大,光栅的慢光峰值波长出现蓝移,且时延量逐渐减小;1.06 cm长的光子晶体光纤布拉格光栅可以产生约52 ps的线性时延;光栅长度越大,慢光时延量越大;优化结构参数,在光子晶体光纤布拉格光栅的时延谱的侧瓣附近会产生最大群速度为c/371的慢光峰。
The modified full-vector effective refractive index method and coupled-mode theory are used to study the variation of photonic crystal fiber Bragg grating length, duty cycle, grating period and slow light. The results show that when the grating length and the grating period remain unchanged, the slow-light peak wavelength of the grating appears blue-shift and the time delay decreases with the increase of the duty cycle of the cladding air hole. The 1.06 cm long photonic crystal fiber Bragg grating can produce a linear delay of about 52 ps; the larger the grating length, the greater the slow light delay; optimization of the structure parameters, the maximum group velocity will be generated near the side lobe of the photonic crystal fiber Bragg grating delay spectrum c / 371 slow light peak.