Hong Tao, Yuean Mi, Hao Gu, Xuejian Li, Wenhua Ren, Wei Jian, Guobin Ren. Properties of Vector Mode Coupling in Mechanically Induced Microbend Long-Period Fiber Gratings[J]. Acta Optica Sinica, 2020, 40(12): 1206003
- Acta Optica Sinica
- Vol. 40, Issue 12, 1206003 (2020)
Fig. 1. Mechanically induced microbend LPG. (a) Mechanism of manufacture; (b)principle of adjusting grating period
Fig. 2. Effective refractive indices of four vector modes of the step-index fiber and phase matching curves
Fig. 3. Transmission spectra of vector modes. (a) Transmission spectra; (b) theoretical value of resonant wavelength
Fig. 4. Transmission spectra of high-order vector modes with different microbend amplitudes. (a) TM01; (b) H
Fig. 5. Properties the inverse-parabolic index fiber. (a) Refractive index profile; (b) effective indices of four vector modes and phase matching curves
Fig. 6. Transmission spectra of vector modes in the mechanically induced microbend LPG based on the inverse-parabolic index fiber. (a) Transmission spectra; (b) theoretical value of resonant wavelength
Fig. 7. Transmission spectra of high-order modes and coupling coefficients as functions of microbend amplitude. (a) Transmission spectra of high-order modes; (b) coupling coefficients
Fig. 8. Transmission spectra of TE01 mode and resonant wavelength versus angle θ. (a) Transmission spectra of TE01 mode; (b) resonant wavelength
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