The structure of the F-P modulator is shown in the figure. It uses the reflection of both end surfaces to form an F-P cavity. The phase delay of the light wave in the F-P cavity changes with the change of the refractive index caused by the voltage applied to the waveguide electrode, and the output light intensity also changes accordingly, thereby realizing the detection of the incident light. signal modulation.
Compared with other structural forms of modulators (M-Z interference modulators, directional coupling modulators, etc.), F-P modulators have the characteristics of high modulation sensitivity, so they are widely used in optical sensing and optical communications. It has important uses in other aspects. With the development of thin film technology, especially the increase in optional thin film materials, thin film modulator technology has attracted much attention. The research on E/O organic polymer high-speed modulators began in 1990. Due to the advantages of organic polymer materials compared to inorganic materials, It has many advantages, so it is developing very rapidly and is expected to be made into an ultra-high-speed modulator.