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Control of resonant peak depths of tunable long-period fiber gratings using overcoupling
Authors:Sung Hyun Nam  Jonathan Lee  Shizhuo Yin
Affiliation:
  • Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
  • Abstract:We present a method to reduce changes in the resonant peak depth of a long-period fiber grating (LPFG) as the resonant band is tuned by varying the external refractive index. We theoretically analyze the effects of the initial coupling strength on the peak depth change as external refractive index is varied. By controlling the initial coupling strength, it is experimentally demonstrated that an optimum peak depth can be obtained over a range of operating wavelengths that will maximize the sensitivity and stability of LPFG based sensors and tunable filters.
    Keywords:Long-period fiber gratings   Tunable filters   Electro-optic tuning   Mode coupling
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