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Two-wavelength planar add/drop WDM filter employing a three-mode coupling Bragg grating

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3 Author(s)
Gaff, K.W. ; Opt. Sci. Centre, Australian Nat. Univ., Canberra, ACT, Australia ; Ladouceur, F. ; Love, J.D.

A novel six-port planar waveguide device for adding and dropping two wavelengths from a wavelength division multiplexing singlemode fibre using a single blazed grating is presented. By writing a Bragg grating into a multi-moded core at a particular angle to the waveguide propagation direction, power can be coupled from the fundamental mode into only the backward-propagating higher-order modes, which are then separated using an adiabatic mode splitter. Modelling results indicate that >99.9% of the power in the fundamental mode can be transferred to the higher-order modes at their respective Bragg wavelengths, with crosstalk between channels of <-30 dB

Published in:

Electronics Letters  (Volume:36 ,  Issue: 13 )

Date of Publication:

22 Jun 2000

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