High-frequency guided acoustic Brillouin modes have recently been<br> observed in small-core silica photonic crystal fibers. In this paper, we<br> investigate the temperature dependence of the optical sideband frequency<br> generated by one of these guided acoustic waves. The experimental<br> results show a temperature coefficient of 100 kHz/degrees C at an<br> acoustic resonance frequency of 1.15GHz and are in very good agreement<br> with the theoretical predictions. This coefficient demonstrates a<br> temperature sensitivity 10 times larger than that previously reported in<br> conventional single-mode fibers, which is promising in view of potential<br> applications to optical fiber sensors. (C) 2011 Optical Society of<br> America
Frequency-selective excitation of guided acoustic modes in a photonic crystal fiber
Birgit Stiller,
M. Delqué,
J.-C. Beugnot,
M. W. Lee,
G. Mélin,
H. Maillotte,
V. Laude,
T. Sylvestre
We present experimental and numerical results demonstrating the simultaneous frequency-selective excitation of several guided acoustic Brillouin modes in a photonic crystal fiber with a multi-scale structure design. These guided acoustic modes are identified by using a full vector finite-element model to result from elastic radial vibrations confined by the wavelength-scale air-silica microstructure. We further show the strong impact of structural irregularities of the fiber on the frequency and modal shape of these acoustic resonances.
Son et lumière dans les fibres optiques microstructurées
Birgit Stiller
Prix A'Doc de la jeune recherche en Franche-Comté n° 2011
123-142
(2011)
Contact
Research Group Birgit Stiller
Max Planck Institute for the Science of Light Staudtstr. 2 91058 Erlangen, Germany
