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Compact 1×2 wavelength multiplexer modules employing thin-film filters integrated into polymer planar waveguide circuits are presented. The modules also feature on-chip deep-etched U-grooves for precise fibre-chip coupling. Insertion loss <1 dB, crosstalk <−30 dB, and return loss <−50 dB have been achieved by various technological optimisations.
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Keil et al. (2009) studied this question.
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