reflection-type parametric amplifier

reflection-type parametric amplifier: отражательный параметрический усилитель, параметрический усилитель отражательного типа

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Optical amplifier — An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from… … Wikipedia
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