Optical modulators

Optical modulators

Devices that serve to vary some property of a light beam. The direction of the beam may be scanned as in an optical deflector, or the phase or frequency of an optical wave may be modulated. Most often, however, the intensity of the light is modulated.

Rotating or oscillating mirrors and mechanical shutters can be used at relatively low frequencies (less than 105 Hz). However, these devices have too much inertia to operate at much higher frequencies. At higher frequencies it is necessary to take advantage of the motions of the low-mass electrons and atoms in liquids or solids. These motions are controlled by modulating the applied electric fields, magnetic fields, or acoustic waves in phenomena known as the electrooptic, magnetooptic, or acoustooptic effect, respectively. See Acoustooptics, Electrooptics, Kerr effect, Magnetooptics

Optical modulators

Devices that serve to vary some property of a light beam. The direction of the beam may be scanned as in an optical deflector, or the phase or frequency of an optical wave may be modulated. Most often, however, the intensity of the light is modulated.

Rotating or oscillating mirrors and mechanical shutters can be used at relatively low frequencies (less than 105 Hz). However, these devices have too much inertia to operate at much higher frequencies. At higher frequencies it is necessary to take advantage of the motions of the low-mass electrons and atoms in liquids or solids. These motions are controlled by modulating the applied electric fields, magnetic fields, or acoustic waves in phenomena known as the electrooptic, magnetooptic, or acoustooptic effect, respectively.

References in periodicals archive ?
Integrated Silicon-Based Optical Modulators: 100 Gb/s and Beyond
Tenders invited for Integrated optical modulators please see the attachment uploded
The NetPark firm has developed specialised optical modulators, which put a high-frequency electrical signal on to fibre for demanding, high-capacity transmission systems.
The Mo[Te.sub.2] has been prepared via chemical vapor deposition method and then integrated with D-shaped fiber to act as the nonlinear optical modulators. Maximum output pulse energy of 150.6 nJ has been obtained at a repetition rate of 13.9 kHz from the laser cavity under the input pump power of 180 mW at 980 nm.
Analysis of optical modulators for radio over free space communication systems and radio over fiber systems.
We set the [V.sub.[pi]] value to 5 V, and the insertion loss to 3 dB in the intensity optical modulators.
Because data is characterized by its I and Q components, four separate bit streams are required to drive Mach-Zehnder I/Q optical modulators for both polarizations, as shown in Figure 1.
[UKPRwire, Mon Feb 23 2015] Silicon Photonics Market by Product (Photonic Wavelength, Optical Modulators, Optical Interconnects, WDMF, LED, and Others), Application (Telecommunication, Data Communication, and Others) and by Geography - Global Trends and Forecasts to 2014 - 2020
This research study on the Silicon Photonics market focuses on various product segments such as Silicon Photonic Waveguides, Optical modulators, Optical Interconnects, Wavelength division multiplexer filters, Silicon LED's and Silicon Photo-detectors.
All these optical modulators are [LiNbO.sub.3] Mach-Zehnder modulators (LN-MZMs).
The fundamental mode of the i-th channel is converted to the i-th higher-order mode by using a mode converter, and then modulated with subsequently cascaded optical modulators. These modulated N-channel data are then multiplexed with a mode multiplexer.
Popovic and his colleagues created two different optical modulators -- structures that detect electrical signals and translate them into optical waves -- that can be fabricated within the same processes already used in industry to create today's state-of-the-art electronic microprocessors.