Abstract
An experimental approach to directly measure acoustic dispersion for a single-mode-fiber-based acoustooptic tunable filter excited by flexural acoustic wave has been proposed and experimentally demonstrated. The cladding modes that participate in the mode coupling process have been ascertained by using the phase matching condition. And based on experimental observation of transmission spectral response to applied frequency, acoustic phase velocity as a function of applied radiation frequency signal frequency has been obtained. Furthermore, averaged acoustic dispersion across different cladding modes indicates that acoustic round frequency linearly increases with the increment of acoustic propagation constant with a coefficient of determination of 0.99941.
| Original language | English |
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| Pages (from-to) | 1281-1285 |
| Number of pages | 5 |
| Journal | Microwave and Optical Technology Letters |
| Volume | 54 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 2012 |
Keywords
- acoustic dispersion measurement
- fiber-based acoustooptic tunable filter (fiber-based AOTF)
- flexural acoustic wave
- long period grating
- mode coupling