Wavelength demultiplexers, based on the two-mode interference principle, are demonstrated for the first time in the AlGaInAs/InP material system. Wavelength separation between 35 and 100nm has been achieved in the 1.3–1.6μm spectral range, with channel isolation as high as 17dB for unpolarised light
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Bernardi et al. (1989) studied this question.
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