Page 242 - Introduction to Information Optics

4.3. Fast Electro-optic Switches: Modulators

Electrodes

Fig. 4.20. Waveguide phase modulator with two different electrode arrangements.

Setting |A0| = n, Eq. (4.37) can be inverted to provide the half-wave voltage-
length product.

V.L (4.38)

4.3.2.1.2. Bandwidth Considerations
In many practical applications, we need modulators with high bandwidth
for high-speed communications. There are several factors limiting the highest
modulation bandwidth for different configurations of modulators. The main
parameters characterizing a waveguide modulator are the modulation band-
width and the drive voltage required to obtain a given modulation depth.