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Mode evolution type polarization splitter on InGaAsP/InP

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6 Author(s)
Van Der Tol, J.J.G.M. ; PTT Res. Neher Labs., Leidschendam, Netherlands ; Pedersen, J.W. ; Metaal, E.G. ; Oei, Y.S.
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A new type of mode-evolution polarization-splitter based on InGaAsP/lnP has been designed and realized. The component uses the large waveguide birefringence of the first-order TE and TM modes in a ridge waveguide made in a heterostructure, In the input section an asymmetric Y-junction acts as a mode converter in order to inject first-order TE- and TM-modes in a polarization-splitting section, which consists of a Y-junction formed by a bimodal and a monomodal waveguide. In the output section a third Y-junction is connected to the bimodal waveguide to couple the first-order mode to a monomodal output waveguide. Components that are 6-mm long and show polarization splitting at a wavelength of 1.55 mu m have been realized. The best splitting ratios are close to -20 dB, which is in agreement with BPM simulations. Excess losses are below 1 dB.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 12 )