Title :
Evidence of space-charge effects in thermal poling
Author :
Xu, W. ; Arentoft, J. ; Wong, D. ; Fleming, S.
Author_Institution :
Opt. Fiber Technol. Centre, Sydney Univ., NSW, Australia
Abstract :
The in situ thermal poling processes in germanosilicate fibers for positive and negative poling voltages are significantly different. Thermal poling of silica fibers consists of two processes: the faster linear process of charge migration and the subsequent single exponential process of charge ionization. Both the shielding electrical field due to charge migration and the ionization electrical field due to charge ionization are able to be frozen-in at room temperature and lead to the residual linear electrooptic effects. The observations support that the mechanism of the induced electrooptic effects is based on space charge electrical fields instead of dipole/bond orientation.
Keywords :
electro-optical devices; electro-optical effects; ionisation; optical fibre fabrication; space charge; thermo-optical effects; charge ionization; charge migration; frozen-i; germanosilicate fibers; in situ thermal poling processes; induced electrooptic effects; ionization electrical field; negative poling voltages; positive poling voltages; residual linear electrooptic effects; room temperature; shielding electrical field; single exponential process; space charge electrical fields; space-charge effects; thermal poling; Australia; Electrooptic effects; Ionization; Low earth orbit satellites; Optical fiber devices; Optical fibers; Silicon compounds; Space charge; Temperature; Voltage;
Journal_Title :
Photonics Technology Letters, IEEE
