By using the thermo-optical effect of fluorinated polyimide to modulate the index in partial region of multimode waveguide,a tunable polyimide-based multimode interference(MMI) waveguide power splitter is designed.
Recently various types of attenuators have been realized which include the use of mechanism, magnetic-optical effect, thermo-optical effect, electro-optic effect, acoustic-optical effect, MEMS, optical wave-guide and so on.
A Si Fabry-Perot tunable filter by the technique of bonding and lapping and its design and fabrication are reported,where tuning is realized by thermal-optical effect from the heat of the forward carrier injection.
By analyzing the relation between the refractive index and the temperature and the stress field of the optical window in the aero-dynamic environment,according to the thermal-optical effect and the elasto-optical effect,we obtained the relationship of the index-of-refraction and temperature and stress,and explored the further study method of the aero-optical effect.
Due to relatively strong thermo-optical effect, we can change the refractive index of the LC by changing its temperature.
When the temperature varies, not only the refractive index of the optical medium is changed because of the thermo-optical effect, but also the thickness of the optical medium is changed due to the thermal-expansion effect.
In this paper a new Z-scan theory is introduced, which is applicable to the thermo-optical effect in the presence of both linear and nonlinear absorption and an arbitrary extent of optical nonlinearity.
In the active on-state, low-loss waveguiding is sustained when an electrode causes an appropriate refractive index change, e.g., due to the thermo-optical effect.