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Multicore polymer waveguides and multistep 45° mirrors for 3D photonic integration

: Zhang, Z.; Kleinert, M.; Maese-Novo, A.; Irmscher, G.; Schwartz, E.; Zawadzki, C.; Keil, N.


IEEE Photonics Technology Letters 26 (2014), Nr.19, S.1986-1989
ISSN: 1041-1135
Fraunhofer HHI ()

Multicore, compact, and low-crosstalk polymer waveguides have been designed, fabricated, and characterized. These single-mode waveguides are arranged in five layers following a hexagonal lattice with 20- m pitch. The waveguides exhibit similar propagation loss of <1 dB/cm (at 1550 nm) without any polarization-dependent effect. The interwaveguide crosstalk remains below -40 dB at 3.8-cm propagation length. A series of multistep 45° mirrors have been introduced to extract light from each of the individual layers. The mirror loss ranges from 1.5 to 1.9 dB, with deep mirrors being gradually more loss-prone due to the free-space beam broadening.