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Accurate tuning of mismatched twin-core fibre filters
Departamento de Comunicaciones, ETSl Telecomunicacion, Universidad de Valencia, Camino de Vera s.n 46071, Valencia, Spain
Optoelectronics Research Centre, University of Southampton, UK
We have demonstrated a reproducible and accurate way of tuning the coupling wavelength of a mismatched twin-core filter. This method allows high quality all-fiber filters to be implemented with low loss at any desired wavelength over a range of few hundred nanometers from the same fiber. An ~500-nm tuning range is demonstrated, limited only by the measurement setup and not by the technique itself. Highly accurate control of the filtering wavelength in combination with control of filtering strength by adjustment of the length of the twin-core fibers allows complex filter profiles to be implemented by cascading of several different filters. These filters are also very stable to a change in temperature (~0.26 nm/100 °C at 1.55 μm) and strain (less than 0.3 nm/mstrain at 1.55 μm), permitting easy packaging.
Optics Letters (1998) Vol.23(16) pp.1277-1279
Copyright University of Southampton 2006