Title :
Polarization dependent loss in a Ti:LiNbO3 polarization scrambler/controller
Author :
Fujiwara, Toshihito ; Watanabe, A. ; Mori, Hisamichi
Author_Institution :
Central Lab., Sumitomo Metal Min. Co. Ltd., Tokyo, Japan
fDate :
4/1/1996 12:00:00 AM
Abstract :
We have investigated the polarization dependent loss (PDL) of a waveguide-type polarization scrambler/controller consisting of a half-wave plate (HWP) and a quarter-wave plate (QWP) in series fabricated in x-cut/z-propagating Ti-diffused LiNbO3 optical waveguides. Based on the polarization dependences of both the propagation loss coefficient and mode-mismatch loss with fiber at 1.55 μm combined with a numerical analysis, the PDL of the fabricated device is estimated to be 0.063 dB. It is shown that the low PDL is a direct consequence of a special anisotropy relation between the propagation loss and waveguide-fiber mode-mismatch loss.
Keywords :
light polarisation; lithium compounds; optical couplers; optical fabrication; optical fibre couplers; optical losses; optical planar waveguides; titanium; 0.063 dB; 1.55 mum; LiNbO/sub 3/:Ti; Ti:LiNbO/sub 3/; anisotropy relation; fabricated device; half-wave plate; mode-mismatch loss; numerical analysis; optical waveguides; polarization dependences; polarization dependent loss; polarization scrambler/controller; propagation loss; propagation loss coefficient; quarter-wave plate; waveguide-fiber mode-mismatch loss; waveguide-type polarization scrambler/controller; Optical control; Optical fiber devices; Optical fiber losses; Optical fiber polarization; Optical losses; Optical polarization; Optical retarders; Optical waveguides; Page description languages; Propagation losses;
Journal_Title :
Photonics Technology Letters, IEEE
