Abstract

We demonstrate fast and accurate measurements of fiber Bragg grating dispersion and spectral reflectance using low-coherence interferometry. Both dispersion and spectral reflectance are obtained in less than 60 seconds, rendering the results immune to errors caused by temperature variations and instrumental drift. To examine the accuracy of the low-coherence technique, we compare the results with independent measurements and demonstrate an agreement better than 1.5 ps for dispersion and 25 pm for spectral reflectance wavelength. This manuscript describes work of the US Government and therefore is not subject to copyright.

© Optical Society of America

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References

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  1. P. -L. Francois, M. Monerie, C. Vassallo, Y. Durteste, and F. R. Alard, "Three ways to implement interferencial techniques: application to measurements of chromatic dispersion, birefringence, and nonlinear susceptibilities," J. Lightwave Technol. 7, 500-513 (1989).
    [CrossRef]
  2. W.H. Knox, N.M. Pearson, K.D. Li, and C.A. Hirlimann, "Interferometric measurements of femtosecond group delay in optical components," Opt. Lett. 13, 574-576 (1988).
    [CrossRef] [PubMed]
  3. J. Gehler, W. Spahn, and K. L�sch, "Dispersion measurement of arrayed waveguide gratings by Fourier transform spectroscopy," in Proceedings of the 25th European Conference on Optical Communications, (Institution of Electrical Engineers, London, 1999), pp. I-368.
  4. R. Kashyap, Fiber Bragg Gratings (Academic Press, New York, 1999), pp. 418-426.
  5. S.E. Mechels, J.B. Schlager, and D.L. Franzen, "Accurate measurements of the zero-dispersion wavelength in optical fibers," J. of Research of the National Institute of Standards and Technology, 102, 333-347 (1997).
    [CrossRef]
  6. P. Lambelet, P.Y. Fonjallaz, H.G. Limberger, R.P. Salath�, Ch. Zimmer, and H.H. Gilgen, "Bragg grating characterization by optical low-coherence reflectometry," IEEE Photonics Technol. Lett. 5, 565-567 (1993).
    [CrossRef]
  7. U. Wiedmann, P. Gallion, and G.-H. Duan, "A generalized approach to optical low-coherence reflectometry including spectral filtering effects," J. Lightwave Technol. 16, 1343-1347 (1998).
    [CrossRef]
  8. S.D. Dyer and K.B. Rochford, "Low-coherence interferometric measurements of fiber Bragg grating dispersion," Electron. Lett. 35, 1485-1486 (1999).
    [CrossRef]

Other

P. -L. Francois, M. Monerie, C. Vassallo, Y. Durteste, and F. R. Alard, "Three ways to implement interferencial techniques: application to measurements of chromatic dispersion, birefringence, and nonlinear susceptibilities," J. Lightwave Technol. 7, 500-513 (1989).
[CrossRef]

W.H. Knox, N.M. Pearson, K.D. Li, and C.A. Hirlimann, "Interferometric measurements of femtosecond group delay in optical components," Opt. Lett. 13, 574-576 (1988).
[CrossRef] [PubMed]

J. Gehler, W. Spahn, and K. L�sch, "Dispersion measurement of arrayed waveguide gratings by Fourier transform spectroscopy," in Proceedings of the 25th European Conference on Optical Communications, (Institution of Electrical Engineers, London, 1999), pp. I-368.

R. Kashyap, Fiber Bragg Gratings (Academic Press, New York, 1999), pp. 418-426.

S.E. Mechels, J.B. Schlager, and D.L. Franzen, "Accurate measurements of the zero-dispersion wavelength in optical fibers," J. of Research of the National Institute of Standards and Technology, 102, 333-347 (1997).
[CrossRef]

P. Lambelet, P.Y. Fonjallaz, H.G. Limberger, R.P. Salath�, Ch. Zimmer, and H.H. Gilgen, "Bragg grating characterization by optical low-coherence reflectometry," IEEE Photonics Technol. Lett. 5, 565-567 (1993).
[CrossRef]

U. Wiedmann, P. Gallion, and G.-H. Duan, "A generalized approach to optical low-coherence reflectometry including spectral filtering effects," J. Lightwave Technol. 16, 1343-1347 (1998).
[CrossRef]

S.D. Dyer and K.B. Rochford, "Low-coherence interferometric measurements of fiber Bragg grating dispersion," Electron. Lett. 35, 1485-1486 (1999).
[CrossRef]

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Figures (3)

Fig. 1.
Fig. 1.

Diagram of low-coherence interferometer. AR=antireflection (index-matching) gel; BS=beamsplitter; DBS=dichroic beamsplitter; GL=grin lens; M=mirror; PC=polarization controller; TS=translation stage.

Fig. 2.
Fig. 2.

Comparison of group delay obtained from low-coherence interferometric and modulation-phase shift measurements. The difference between the modulation-phase shift and low-coherence results over the grating’s 3 dB bandwidth is also shown.

Fig. 3.
Fig. 3.

Comparison of reflectance spectra measured with low-coherence interferometry and with a tunable laser system.

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