Abstract

Twin-hole fibers were provided with Au-Sn alloy electrodes and thermally poled at 255 °C. The evolution of the depletion layer was studied by etching fibers poled at varying poling temperatures. The electro-optic response was measured for different poling times. When the depletion region did not overlap the core the direction of the recorded field was opposite to the applied poling field. Poling for a longer time made the depletion region extend through the core and changed the sign of the recorded field.

© 2005 Optical Society of America

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References

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Appl. Phys. Lett. (1)

D. Faccio, V. Pruneri and P. G. Kazansky, "Dynamics of the second-order nonlinearity in thermally poled silica glass," Appl. Phys. Lett. 79, 2687 (2001)
[CrossRef]

Electron. Lett. (1)

P. G. Kazansky, P. St. J. Russell and C. N. Pannell, "Optical fibre elecrets: observation of electro-acousto-optic transduction," Electron. Lett. 30, 1436 (1994)
[CrossRef]

IEEE Coll. on Adv. Fibre Waveguide Dev. (1)

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IEEE Phot. Tech. Lett. (1)

X.-C. Long, R. A. Myers and S. R. J. Brueck, "A Poled Electrooptic Fiber," IEEE Phot. Tech. Lett. 8, 227 (1996)
[CrossRef]

J. Lightwave Technol. (1)

J. Non-Cryst. Solids (1)

T. G. Alley, S. R. J. Brueck and R. A. Myers, "Space charge dynamics in thermally poled fused silica," J. Non-Cryst. Solids 242, 165 (1998)
[CrossRef]

J. Opt. Soc. Am. B (2)

Opt. Express (1)

Opt. Fib. Tech. (1)

D. Wong, W. Xu, S. Fleming, M. Janos and K.-M. Lo, "Frozen-in Electrical Field in Thermally Poled Fibers," Opt. Fib. Tech. 5, 235 (1999)
[CrossRef]

Opt. Lett. (3)

Phot. Tech. Lett. (2)

T. Fujiwara, D. Wong and S. Fleming, "Large Electrooptic Modulation in a Thermally-Poled Germanosilicate Fiber,�?? Phot. Tech. Lett. 7, 1177 (1995)
[CrossRef]

W. Xu, J. Arentoft, D. Wong, and S. Fleming, "Evidence of Space-charge Effects in Thermal Poling," Phot. Tech. Lett. 11, 1265 (1999)
[CrossRef]

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Figures (3)

Fig. 1.
Fig. 1.

After poling, when the voltage bias is switched off, positive charges are attracted from the metal surfaces of both anode and cathode to shield the field in the metal. If the negative charges recorded in the poled fiber are closer to the cathode side, the field outside the depletion region is larger than inside it [8].

Fig. 2.
Fig. 2.

Spatial evolution of the depletion region measured by etching, temperature is increasing from upper left to lower right picture. The overlap with the core improves with increasing temperature until the region encompasses the entire core. Note the substructure in the lower right picture indicating that the core is slowing down the evolution of the depletion layer.

Fig. 3.
Fig. 3.

(left figure) Intensity vs. voltage response to find recorded field. The arrow indicates a symmetry point in the Mach-Zehnder interferometer where the applied voltage cancels the recorded field. (right figure) Time evolution of the recorded electric field. The recorded field first has negative sign. After 23 minutes of poling the recorded field is zero after which the sign changes to be the same as that of the applied voltage.

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