Optical modulators using semiconductor nano-structures: Difference between revisions

Revision as of 09:44, 3 June 2009

Revision as of 09:45, 3 June 2009

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The crystal which is covered by electrode may be considered to be a voltage-variable wave-plate. When a voltage is applied, the retardation of laser polarization of the light would be changed while a beam passes through an ADP crystal. This variation in polarization results in intensity modulation downstream from the output polarizer. The output polarizer converts the phase shift into an amplitude modulation. The ideal electro-optic material possesses all of the following properties:

• large change in refractive index per volt.

• high optical quality and transmission

• low dielectric constant (low capacitance).

• low dielectric loss tangent (no dielectric heating due to a high-frequency electric field)

• low dielectric constant (low capacitance).

• no distortions in modulators output from piezoelectric resonances.

• low dielectric loss tangent (no dielectric heating due to a high-frequency electric field)

• no distortions in modulators output from piezoelectric resonances.