Abstract
Aiming efficient multiple simultaneous detection, two different designs of 1×N power splitters for single source feeding of an N-array biosensors operating at 1550 nm are here proposed and thoroughly compared and discussed. Taking into account the need for micro guiding structures, simpler and cheaper manufacturing processes, SU-8 polymer is adopted as the core material. Our first proposal is based on a cascade arranged directional couplers (DC) with a footprint of 4.2×0.42 mm2, uniform power division and losses of 0.54 dB. The second proposal is based on a multimode interference device (MMI) exhibiting a compact footprint of 1.25×0.23 mm2, highly uniform power division and significant low losses of 0.16 dB.
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