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Optics Letters

Optics Letters


  • Vol. 15, Iss. 2 — Jan. 15, 1990
  • pp: 102–104

Photoinduced refractive-index changes in germanosilicate fibers

D. P. Hand and P. St. J. Russell  »View Author Affiliations

Optics Letters, Vol. 15, Issue 2, pp. 102-104 (1990)

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Photoinduced guided index changes approaching 10−4 in the range 488–784 nm, measured using a simple interferometric technique, are reported in germanosilicate single-mode optical fibers exposed to the 488-nm line of an Ar+ laser running multifrequency. The wavelength dependence and dynamics of the writing process are characterized, and the material dispersion of the induced Δn(λ) is shown to be weak. The effect is placed in the context of related research on color centers in these fibers, and two different mechanisms are proposed that lead to quantitative estimates in rough agreement with the measured Δn values.

© 1990 Optical Society of America

Original Manuscript: August 7, 1989
Manuscript Accepted: November 6, 1989
Published: January 15, 1990

D. P. Hand and P. St. J. Russell, "Photoinduced refractive-index changes in germanosilicate fibers," Opt. Lett. 15, 102-104 (1990)

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  1. B. S. Kawasaki, K. O. Hill, D. C. Johnson, Y. Fujii, Opt. Lett. 3, 66 (1978). [CrossRef] [PubMed]
  2. J. Stone, J. Appl. Phys. 62, 4371 (1987). [CrossRef]
  3. D. P. Hand, P. St. J. Russell, in Proceedings of International Conference on Integrated Optics and Optical Fiber Communication (IOOC, Kobe, Japan, 1989), paper 21C3–4.
  4. M. A. Saifi, Y. Silberberg, H. Fouckhardt, A. M. Weiner, M. J. Andrejco, in Proceedings of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1989), paper THH3.
  5. Assuming that P = 100 mW in the core and an induced loss of α = 0.23 m−1 (1000 dB/km), the temperature rise in the core would be (αP/2πk)ln[rf/w(488)] ∼ 0.0016 K, where k = 9.2 W/mK, rf = 40 μm is the fiber outer radius, and w(488) = 0.76 μm is the spot radius at 488 nm. Given that dn/dT = 1.3 × 10−5 K−1, this predicts a thermal Δn of 2 × 10−8.
  6. SeeL. J. Poyntz-Wright, P. St. J. Russell, Electron. Lett. 25, 478 (1989), and references therein. [CrossRef]
  7. M.-V. Bergot, M. C. Farries, M. E. Fermann, L. Li, L. J. Poyntz-Wright, P. St. J. Russell, A. Smithson, Opt. Lett 13, 592 (1988). [CrossRef] [PubMed]
  8. E. J. Friebele, D. L. Griscom, in Proceedings of the Materials Research Society Symposium (Materials Research Society, Pittsburgh, Pa., 1986), p. 319.
  9. P. D. Townsend, J. C. Kelly, Colour Centres and Imperfections in Insulators and Semiconductors (Chatto and Windus, London, 1973), pp. 35ff.

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