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Add-drop multiplexing by dispersion inverted interference coupling

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4 Author(s)
Aslund, M. ; Opt. Fiber Technol. Centre, Sydney Univ., NSW, Australia ; Poladian, L. ; Canning, J. ; de Sterke, C.M.

We demonstrate experimentally a previously proposed add-drop multiplexer in a two-moded structure with a symmetric Bragg grating. The strong dispersion in the forward direction outside the reflective region of the grating is used to create a phase change for frequencies between the bandgaps of the supermodes of a twin core fiber. The phase change in transmission inverts the interference pattern at the end of the device. Signals within a narrow wavelength range couple out to one core; all other wavelengths couple out to the opposite core. Preliminary experimental results show a crosstalk ratio of 15 dB.

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Lightwave Technology, Journal of  (Volume:20 ,  Issue: 8 )