Hannover 2003 – scientific programme
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Q: Quantenoptik
Q 49: Poster: Photonik
Q 49.17: Poster
Thursday, March 27, 2003, 16:30–18:30, Lichthof
Spectral characterisation of wavelength references based on Fibre Bragg gratings — •Gesine Grosche1, Michael Eggert1, and Johann Meissner2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Advanced Optics Solutions, Dresden, Germany
Special fibre Bragg gratings (FBG) are investigated as potential wavelength references in the near-infrared, especially for optical telecommunications around 1550 nm [1]. A wavelength accuracy of about Δ λ / λ<10−6 may enable their use as calibrators of measuring equipment. We present and compare two complementary methods for the characterisation of spectral properties of such FBGs. The first is based on a custom-built SI- traceable Fourier-Transform Spectrometer with down to 80 MHz resolution [2]. To maximise the signal to noise ratio, broad band light from a powerful fibre based source is pre-filtered with a tunable grating. Reflection and transmission spectra of FBGs in the C- and L-band (near 1550 nm and 1582 nm) have been obtained with 300 MHz resolution. The second method uses a commercial DFB-laser near 1550 nm which is temperature tuned while reflection, transmission, laser power and laser wavelength are continuously monitored. This approach also allows measurements of polarisation effects.
The work is part of the project CREW funded by the European Commission under Contract G6RD-CT-2001-00425.
[1] E. G. Grosche et al. in: Proc. Opt. Fibre Meas. Conf. 2001, pp. 189- 192 [ISBN 0 946754 40 3]
[2] U. Sterr et al., "A high accuracy Fourier transform wavelengthmeter", in prep.