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An electro-optic phase modulator for free-space beams An optical intensity modulator for optical telecommunications. An electro-optic modulator (EOM) is an optical device in which a signal-controlled element exhibiting an electro-optic effect is used to modulate a beam of light.
This sort of modulation is called direct modulation, as opposed to the external modulation performed by a light modulator. For this reason, light modulators are called external light modulators. According to manipulation of the properties of material modulators are divided into two groups, absorptive modulators ( absorption coefficient ) and ...
The output of the photodetector is amplified and filtered and fed back to the electric port of the modulator. This configuration supports self-sustained oscillations, at a frequency determined by the fiber delay length, the bias setting of the modulator, and the band pass characteristics of the filter. It also provides for both electric and ...
Optical homodyne detection. In electrical engineering, homodyne detection is a method of extracting information encoded as modulation of the phase and/or frequency of an oscillating signal, by comparing that signal with a standard oscillation that would be identical to the signal if it carried null information.
Long-haul Optical Transport Network (OTN) networks were the traditional users of coherent modulation. Cloud scale data centers have become an important consumer of coherent optical modules, particularly in the Ethernet connectivity space for reaches greater than 10 km where the advantages of coherent modulation can outweigh the increased cost.
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Load Modulation is a method of conveying a signal from one device to another by means of modulating the load that the transmitting device imposes on a radio signal provided by the receiving device. This is used, for example, to allow ISO/IEC 14443 and ISO/IEC 15693 NFC cards to reply to the reading device without the need for the NFC card to ...
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