What are electro-optic modulators used for?
Overview. Electro-optic amplitude and phase modulators allow you to control the amplitude, phase, and polarization state of an optical beam electrically. For instance, in communications systems, these modulators impress information onto an optical frequency carrier.
What is the principle of electro-optic modulator?
The principle of operation is based on the linear electro-optic effect (also called the Pockels effect), i.e., the modification of the refractive index of a nonlinear crystal by an electric field in proportion to the field strength.
How does an optical modulator work?
An optical modulator is a device which is used to modulate a beam of light. The beam may be carried over free space, or propagated through an optical waveguide (optical fibre). This sort of modulation is called direct modulation, as opposed to the external modulation performed by a light modulator.
What is meant by electro-optic effect?
An electro-optic effect is a change in the optical properties of a material in response to an electric field that varies slowly compared with the frequency of light. The term encompasses a number of distinct phenomena, which can be subdivided into changes in absorption and changes in refractive index.
What are Electro Optic Systems?
Electro Optic Systems is a leading ASX listed Australian owned and operated Defence, Space and Communications company. We are a world leader in space information and intelligence services, optical, microwave and on-the-move satellite products, optical sensor units and remote weapon systems for the land sea and air.
What is electro-optic crystal?
Product Description: Electro-optical Crystals has been widely used for electro-optic modulators and electro-optic deflectors. In service section, we give a specific example of polarization scrambler. It consists of two variable wave plates orientated at a 45 azimuth with each other.
What are electro-optic polymers?
Polymers are engineered, and as such, can be modified to achieve desired optical, electrical, mechanical, and material (dielectric) properties. The active ingredients are molecules classified as chromophores. Guest-host materials are one class of EO polymer in which a chromophore is mixed with a passive host polymer.
How does electro optical camera work?
EO IMAGERY ARE PHOTOGRAPHIC STILLS CAPTURED WITH AN ELECTRO-OPTICAL SENSOR (A HIGH-RESOLUTION CAMERA EQUIPPED WITH A TELEPHOTO ZOOM LENS) THAT DETECTS THE MAGNITUDE AND COLOR OF EMITTED OR REFLECTED LIGHT AND RECORDS THE INFORMATION IN THE FORM OF PIXELS.
What does an electro optical engineer do?
Electro optical engineers are responsible for completing engineering tasks related to electronic and optical devices, as well as creating optical designs and facilitating the user of laser optics.
What is self electro-optic effect?
An optically bistable device used for photonic switching, constructed of a multiple quantum well biased by an external voltage, which creates an external field that shifts the wavelength of the onset of absorption, varying the transmitted light.
Where are electro-optical sensor used?
Electro-optical sensors are used whenever light needs to be converted to energy. Because of this, electro-optical sensors can be seen almost anywhere. Common applications are smartphones where sensors are used to adjust screen brightness, and smartwatches in which sensors are used to measure the wearer’s heartbeat.
What is an electro-optic modulator?
New Focus™ offers a broad line of Electro-Optic Modulators and drivers that are versatile, reliable and easy to use. All of our optical modulators are based on the electro-optic or Pockels’ effect—the linear dependence of the index of refraction on an applied electric field.
How much voltage is required to induce phase change in electro-optic modulators?
In a Pockels-based electro-optic modulator, the voltage necessary to induce a phase change equal to π can run over a thousand volts (the cell basically behaves like a capacitor), requiring a high-voltage amplifier.
What is a laser-controlled modulator?
Laser-controlled modulators are capable of operating in the gigahertz range, and modulation may be imposed on the amplitude, phase, or polarization of the beam.
What is the function of phase modulator?
Phase modulators are used to vary the phase of an optical beam. When driven sinusoidally, phase modulators can generate frequency sidebands on a cw optical beam. Sinusoidal phase modulation at a frequency Ω generates frequency sidebands at multiples of Ω about the central optical frequency, w.