Polarization dependence of Germanium waveguide propagation characteristics in the 1600?1700 nm wavelength regions

Dependence on polarization of optical propagation characteristics in Ge waveguides was investigated to understand the strain state toward operation of a Ge laser. A TE mode light showed a larger waveguide loss with a dry etched Ge waveguide cavity. A significant increase in the propagation signal intensity under optical pumping was observed only in the TE mode in an n-type doped Ge waveguide.