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A fully packaged 40-channel 100-GHz-spacing full-coupler-type synchronized-gratings multiplexer with a 1-dB bandwidth >57 GHz, total adjacent crosstalk /spl plusmn/35 GHz around the ITU grid <-18 dB, and loss <3.5 dB for all channels is presented.
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Doerr et al. (2003) studied this question.
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