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Compact polarization rotator on silicon for polarization-diversified circuits

2011; Optica Publishing Group; Volume: 36; Issue: 4 Linguagem: Inglês

10.1364/ol.36.000469

1539-4794

Long Chen, C.R. Doerr, Young-Kai Chen,

Photonic Crystals and Applications

We demonstrate a polarization rotator based on adiabatic mode evolution on silicon for polarization-diversified circuits. The rotator has a device length of 420 μm, a polarization-conversion efficiency of more than 90%, and an insertion loss less than 1 dB for a wavelength range of 80 nm. Combining the rotator with a compact, broadband polarization beam splitter based on cascaded directional couplers enhances the polarization conversion extinction ratio to over 30 dB with less than 1.5 dB total insertion loss over a 60 nm spectral range.