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Proceedings Paper

Large off-resonance nonlinear index changes at 1310 nm and 1545 nm observed in ytterbium-doped fiber
Author(s): John W. Arkwright; Pitchaimuth Elango; Trevor Whitbread; Graham R. Atkins
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Paper Abstract

The resonant nonlinearity observed in rare-earth doped fiber is of interest for all-optical switching due to the very low pump powers needed to achieve complete switching. Large nonlinear effects have been observed previously in both erbium and neodymium doped fibers, however, these large effects cannot be explained by taking into account the change in absorption of local transitions alone. Two mechanisms have been suggested to account for these anomalously large index changes, namely thermally induced effects and far from resonance population dependent effects. In this work, an ytterbium doped twin-core fiber is used to investigate the tow possible mechanisms, and by allowing the doped fiber to lase and observing the clamping of the induced phase change, it is demonstrated that the effect is population dependent in nature. The observed wavelength response of the effect shows an increase in induced phase towards shorter wavelengths, which suggests that the effect is due principally to changes in strong absorptions in the UV. This far-from-resonance effect has been used to demonstrate large phase changes at the preferred telecommunications windows of 1300nm and 1550nm.

Paper Details

Date Published: 20 November 1996
PDF: 12 pages
Proc. SPIE 2841, Doped Fiber Devices, (20 November 1996); doi: 10.1117/12.258972
Show Author Affiliations
John W. Arkwright, Siemens (Victoria) Ltd. and Australian Photonics CRC (Australia)
Pitchaimuth Elango, Australian Photonics CRC/Univ. of New South Wales (Australia)
Trevor Whitbread, Australian Photonics CRC/Univ. of New South Wales (Australia)
Graham R. Atkins, Optical Fibre Technology Ctr. and Australian Photonics CRC (Australia)

Published in SPIE Proceedings Vol. 2841:
Doped Fiber Devices
Michel J. F. Digonnet; Francois Ouellette, Editor(s)

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