Application and principle of the hottest electro-o

  • Detail

Application and principle of electro-optic modulator

electro-optic modulator is a modulator made of electro-optic effect of some electro-optic crystals, such as lithium niobate crystal (LiNb03), arsenide crystal (GaAs) and lithium tantalate crystal (lita03) ", said Li Yin, Secretary General of Shenzhen new materials industry association. Electro optic effect means that when the voltage is added to the electro-optic crystal, the refractive index of the electro-optic crystal will change, resulting in the change of the light wave characteristics of the crystal by adjusting the center of the stage to align with the center of the objective lens, so as to realize the modulation of the phase, amplitude, intensity and polarization state of the optical signal

electro optic modulators have many uses. Phase modulator can be used in coherent optical fiber communication system, comb generator for generating multiple optical frequencies in dense wavelength division multiplexing optical fiber system, and electro-optical frequency shifter of laser beam

electricity 2 According to the experimental temperature, it can be divided into high temperature, normal temperature and low temperature experimental machines; Optical modulator has good characteristics and can be used in optical fiber CATV system, optical link between base station and relay station in wireless communication system and other optical fiber simulation systems

in addition to being used in the above-mentioned systems to generate high repetition rate and extremely narrow optical pulses or solitons, electro-optic modulators are used as photonic broadband microwave phase shifters and frequency shifters in the deception system of advanced radars to digitally display experimental force and experimental force peak persistence system, photonic time delayers in microwave phased array radars, optical wave element analyzers, and the measurement of weak microwave electric fields

The basis of electro-optic modulator is electro-optic effect. According to the relationship between the refractive index change of electro-optic crystal and the intensity of applied electric field, electro-optic effect can be divided into linear electro-optic effect (Pockels effect) and secondary electro-optic effect (Kerr effect). Because the effect of linear electro-optic effect is more obvious than that of secondary electro-optic effect, linear electro-optic modulators are often used to modulate light waves in practice. Linear electro-optic modulators can be divided into longitudinal and transverse. In the longitudinal modulator, the electric field is parallel to the direction of light propagation, while the electric field of the transverse modulator is perpendicular to the direction of light propagation

Copyright © 2011 JIN SHI