Spectral Characteristics of Square-Wave-Modulated Type II Long-Period Fiber Gratings Inscribed by a Femtosecond Laser

Spectral Characteristics of Square-Wave-Modulated Type II Long-Period Fiber Gratings Inscribed by a Femtosecond Laser

We study here the spectral characteristics of square-wave-modulated type II long-period fiber gratings (LPFGs) inscribed by a femtosecond laser. Both theoretical and experimental results indicate that higher-order harmonics refractive index (RI) modulation commonly exists together with the fundament...

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Bibliographic Details
Main Authors: Xiaofan Zhao, Hongye Li, Binyu Rao, Meng Wang, Baiyi Wu, Zefeng Wang
Format: Article
Language:English
Published: MDPI AG 2021-05-01
Series:Sensors
Subjects:
long-period fiber gratings
higher-order harmonics
femtosecond laser
Online Access:https://www.mdpi.com/1424-8220/21/9/3278

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https://www.mdpi.com/1424-8220/21/9/3278

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