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Integrated polarization beam splitter for 100/400 GE polarization multiplexed coherent optical communications

: Perez-Galacho, D.; Zhang, R.; Ortega-Monux, A.; Halir, R.; Alonso-Ramos, C.; Runge, P.; Janiak, K.; Zhou, G.; Bach, H.-G.; Steffan, A.G.; Molina-Fernandez, I.


Journal of Lightwave Technology 32 (2014), No.3, pp.361-368
ISSN: 0733-8724
Journal Article
Fraunhofer HHI ()

Monolithically integrated polarization management is a key objective for the next generation of high speed optical coherent receivers, and will enable transmission rates up to 400 Gbps. In this work we present a polarization beam splitter (PBS) based on an asymmetrical Mach-Zehnder interferometer (MZI) monolithically integrated with a coherent receiver. Thermal tuning is incorporated on the MZI arms to partially compensate fabrication errors. We propose a complete model that predicts that thermal tuning can furthermore be used to adjust the wavelength response of the PBS. Measurements on a fully integrated receiver validate this model. We show full tunability of the PBS response within the C-band, with a polarization extinction ratio in excess of 16 dB for devices with an estimated width error up to 75 nm.