Title :
A short polarization splitter without metal overlays on InGaAsP-InP
Author :
van der Tol, J.J.G.M. ; Pedersen, J.W. ; Metaal, E.G. ; van Gaalen, J.J.W. ; Oei, Y.S. ; Groen, F.H.
Author_Institution :
R. PPT Nederland, Leidschendam, Netherlands
Abstract :
A new and very short polarization splitter on InGaAsP-InP is designed and realized for the first time. The component contains a ridge waveguide directional coupler of 0.4 mm length and an output section of 0.7 mm. It uses the large waveguide birefringence of the first-order TE and TM modes to obtain polarization selective directional coupling. In this way, additional metal layers on the waveguides to create birefringence are avoided and fabrication becomes very simple. Components are realized, which show splitting ratios close to -20 dB. Excess losses are below 1 dB. The polarization splitting is investigated in the wavelength region of 1525-1560 nm and found to be better than -9 dB.
Keywords :
III-V semiconductors; birefringence; gallium arsenide; gallium compounds; indium compounds; integrated optics; optical couplers; optical design techniques; optical directional couplers; optical fabrication; optical losses; optical polarisers; ridge waveguides; 0.4 mm; 0.7 mm; 1 dB; 1525 to 1560 nm; InGaAsP-InP; birefringence; excess losses; first-order TE modes; first-order TM modes; large waveguide birefringence; metal layers; metal overlays; optical fabrication; output section; polarization selective directional coupling; polarization splitting; ridge waveguide directional coupler; short polarization splitter; wavelength region; Birefringence; Directional couplers; Indium phosphide; Interference; Optical device fabrication; Optical polarization; Optical waveguides; Semiconductor waveguides; Tellurium; Waveguide components;
Journal_Title :
Photonics Technology Letters, IEEE
