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A new digital architecture combining a spatial light modulator written dynamic hologram and a fixed diffractive grating has been demonstrated to produce a tunable wavelength filter with a tuning resolution of 2.5 nm over a 160 nm range. Three modes of a broadband 1.45 µm laser diode have been isolated using the filter and selectively coupled into singlemode communications fibre.
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Warr et al. (1995) studied this question.
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