Polarization rotator based on silicon wire waveguides.
We describe a polarization rotator based on an off-axis double-core structure consisting of a silicon wire waveguide and a silicon-oxinitride waveguide. The rotator can be made by planar fabrication technology and do not require complex processes, such as three-dimensional structure formation. A rotator with 35-microm long provides the polarization rotation angle of 72 degrees and the polarization extinction ratio of 11 dB with the excess loss of about 1 dB. Our polarization rotator represents a significant step towards accomplishing an optical circuit with polarization diversity based on silicon wire waveguides.
NTT Microsystem Integration Laboratories, 3-1, Morinosato-Wakamiya, Atsugi-Shi, Kanagawa, Japan. hfukuda@aecl.ntt.co.jp
Hiroshi
H
Fukuda
Koji
K
Yamada
Tai
T
Tsuchizawa
Toshifumi
T
Watanabe
Hiroyuki
H
Shinojima
Sei-ichi
S
Itabashi