Polarization-independent optical directional coupler based on slot waveguides.
A polarization-independent optical directional coupler based on slot waveguides is proposed and analyzed by using rigorous full-vectorial analysis methods based on a finite-element scheme. Properly choosing materials and structural parameters makes the coupling length for quasi-TE modes become equal to that for quasi-TM modes. Tolerances to operating wavelength and structural parameters are also discussed. The proposed coupler can be used for highly integrated optical circuits without polarization diversity schemes.
Fujisawa
Takeshi
T
Division of Media and Network Technologies, Hokkaido University, Sapporo 060-0814, Japan. fujisawa@dpo7.ice.eng.hokudai.ac.jp
Koshiba
Masanori
M