Open AccessHighly efficient passive InP polarization rotator-splitter
Author(s) -
Shahram Keyvaninia,
Hendrik Boerma,
Markus Wössner,
Felix Ganzer,
Patrick Runge,
Martin Schell
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.025872
Subject(s) - optics , fabrication , beam splitter , extinction ratio , materials science , polarization rotator , polarization (electrochemistry) , optoelectronics , splitter , adiabatic process , wavelength , birefringence , physics , medicine , laser , chemistry , alternative medicine , pathology , thermodynamics
Monolithically integrated polarization beam splitters (PBSs) are needed to reduce the form-factor and assembly cost of optical coherent receivers. A highly efficient passive polarization rotator and splitter based on mode-evolution is demonstrated. The device is fabricated on InP substrate with a single etch-step and uses an adiabatic mode-converter and an asymmetric Y-coupler. Despite its simple fabrication process, the device shows a polarization extinction ratio (PER) better than 19 dB over 1520 nm to 1620 nm, thus covering both C- and L-band. The peak value of 24 dB is obtained for TE and TM polarizations. Its fabrication tolerance is large, so that even under a width variation of +/- 200 nm the PER remains above 17 dB over the entire C- and L-band.