Barcelos, S., Zervas, M.N., Laming, R.I., Payne, D.N. and Reekie, L.
Time delay characterization of a tunable chirped fibre grating for dispersion compensation.
In, 12th UK National Quantum Electronics Conference (QE12), Southampton, GB,
04 - 08 Sep 1995.
The development of chirped fibre grating filters for dispersion compensation in long fibre telecommunications links requires full and accurate amplitude and time delay characterisation of these devices. We have recently demonstrated a wavelength scanning interferometric technique with sub-picosecond time-delay and 3µm wavelength resolutions to provide such measurements. The system is based on an all-fibre Michelson interferometer. The reference arm of the interferometer is phase-modulated to generate an electric signal at the photodetector which carries the optical phase and amplitude information of the reflective fibre device under test, which is included in the signal arm. The amplitude response of the interferometer is directly proportional to the field reflection coefficient whilst the time delay is given by the derivative of the relative phase with respect to wavelength. A high wavelength resolution tunable laser source (HP8168A/C) is used in conjunction with a fully automated set-up to provide sub-picosecond resolution.
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