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A novel integrated optical wavelength division demultiplexer in InGaAlAs-InP is described. It uses interference between the fundamental (zeroth) and second-order modes in a symmetric waveguide structure. Experimental results show that this device is twice as dispersive as two-mode interference (TMI) devices based on interference between the fundamental and antisymmetric modes. Channel spacings between 15 mu m and 40 nm were obtained with channel isolation in excess of +or-10 dB.>
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Croston et al. (1990) studied this question.
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