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2. Optical amplifier - Wikipedia

   en.wikipedia.org/wiki/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 the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics.

3. Transimpedance amplifier - Wikipedia

   en.wikipedia.org/wiki/Transimpedance_amplifier

   Fig. 2. Transimpedance amplifier with a reverse-biased photodiode. In the circuit shown in figure 1 the photodiode (shown as a current source) is connected between ground and the inverting input of the op-amp. The other input of the op-amp is also connected to ground.

4. Quantum amplifier - Wikipedia

   en.wikipedia.org/wiki/Quantum_amplifier

   In physics, a quantum amplifier is an amplifier that uses quantum mechanical methods to amplify a signal; examples include the active elements of lasers and optical amplifiers. The main properties of the quantum amplifier are its amplification coefficient and uncertainty .

5. Optical parametric amplifier - Wikipedia

   en.wikipedia.org/wiki/Optical_parametric_amplifier

   An optical parametric amplifier, abbreviated OPA, is a laser light source that emits light of variable wavelengths by an optical parametric amplification process. It is essentially the same as an optical parametric oscillator , but without the optical cavity (i.e., the light beams pass through the apparatus just once or twice, rather than many ...

6. Lock-in amplifier - Wikipedia

   en.wikipedia.org/wiki/Lock-in_amplifier

   Today's digital lock-in amplifiers outperform analog models in all relevant performance parameters, such as frequency range, input noise, stability and dynamic reserve. In addition to better performance, digital lock-in amplifiers can include multiple demodulators, which allows analyzing a signal with different filter settings or at multiple ...

7. Variable-gain amplifier - Wikipedia

   en.wikipedia.org/wiki/Variable-gain_amplifier

   A variable-gain (VGA) or voltage-controlled amplifier (VCA) is an electronic amplifier that varies its gain depending on a control voltage (often abbreviated CV). VCAs have many applications, including audio level compression , synthesizers and amplitude modulation .