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Wavelength-insensitive couplers are made by an all-fibre Mach-Zehnder interferometer forming two couplers in series. The splitting ratio of about 0 dB of a fabricated coupler is constant to within +or-1 dB over the large wavelength region of 1.31-1.53 mu m. The fluctuations of a produced coupler with about a 10 dB splitting ratio are within +or-1 dB in the 1.22-1.34 mu m region.<<ETX>>
It is shown that optical fibre filters can be made by choosing core and cladding materials having appropriate dispersive characteristics. The bending loss of the dispersive optical fibres is calculated, and proves them to be useful for short- and long-wavelength-pass filters.
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