Abstract
In this paper, we have numerically and experimentally investigated the radiation mode of 45° tilted fiber grating (45° TFG). By introducing the axial distributions into the volume current method, we have established a three-dimensional theoretical model to analyze spatial distributions of the radiation mode of 45° TFG, and measured the radiation mode spatial distributions in experiment. Both numerical and experimental results show that the radiation mode of 45° TFG exhibits an exponential reduction along the fiber axial direction, and a quasi-Gaussian profile along the radial direction of fiber. Additionally, we have also measured the detailed polarization-dependent azimuthal intensity distributions of radiation modes of both s-and p-polarized core modes. The degree of polarization of radiation mode is around 99.886%, which is independent of the length and the polarization extinction ratio of the grating. Moreover, for the first time, we have experimentally observed a very weak p-polarized component existing in the radiation mode, which has matched well with the simulation results.
| Original language | English |
|---|---|
| Article number | 8728142 |
| Pages (from-to) | 3777-3783 |
| Number of pages | 7 |
| Journal | Journal of Lightwave Technology |
| Volume | 37 |
| Issue number | 15 |
| Early online date | 3 Jun 2019 |
| DOIs | |
| Publication status | Published - 1 Aug 2019 |
Bibliographical note
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- Exponential distribution
- fiber gratings
- fiber optics
- polarization
- radiation