22 April 2006 Numerical investigation of multimode interference in a multimode fiber and its applications in optical sensing
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Abstract
Multimode interference occurring in a singlemode-multimode-singlemode fiber structure is numerically investigated with a wide-angle beam propagation method using the cylindrical coordinate. Two application examples in optical sensing are presented. 1) The wavelength sensitivity of the singlemode-multimode-singlemode structure is utilized and with an appropriate length of the multimode fiber section, the device is developed as an edge filter for a ratiometric wavelength measurement system. 2) When the multimode fiber cladding is removed, it becomes the singlemode-multimode core-singlemode structure and can be developed as an all-fiber refractometer sensor with an optimal length of multimode core section. The designed refractometer can offer an estimated resolution of about 5.4x10-5 for refractive index from 1.33 to 1.45, which is competitive as compared to existing waveguide based optical refractometer sensors while offering a much simpler configuration.
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Qian Wang, Qian Wang, Gerald Farrell, Gerald Farrell, } "Numerical investigation of multimode interference in a multimode fiber and its applications in optical sensing", Proc. SPIE 6189, Optical Sensing II, 61891N (22 April 2006); doi: 10.1117/12.662197; https://doi.org/10.1117/12.662197
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