Optical Waveguide Modulation Techniques
In the following chapter we will briefly review some physical effects useful in the construction of optical modulators. A description of how these effects are put to use in constructing “bulk” modulators will lay the groundwork for a description of the principles of optical waveguide modulators. It will be seen that because the available physical effects are small it is necessary to have a relatively long interaction length to accumulate a useful effect. In “bulk” modulators the diffraction properties of light limit the available interaction length for a given optical beam cross-sectional area. This, in turn, causes the bulk devices to require very high drive powers and voltages and/or currents. Optical waveguide modulators are able to avoid this limitation and thus exhibit much lower power-voltage-current requirements than the bulk devices.
KeywordsSurface Acoustic Wave Extinction Ratio Refractive Index Change Acoustic Power Interaction Length
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