Wavelength division multiplexing refers to a technology in which signals of different wavelengths are transmitted together and separated again. At most, it is used in optical fiber communication to transmit data in multiple channels with slightly different wavelengths. Using this method can greatly improve the transmission capacity of the optical fiber link, and the use efficiency can be improved by combining active devices such as optical fiber amplifiers. In addition to applications in telecommunications, wavelength division multiplexing can also be applied to the case where a single fiber controls multiple fiber optic sensors.
Ultrafast amplifiers are optical amplifiers used to amplify ultrashort pulses. Some ultrafast amplifiers are used to amplify high repetition rate pulse trains to get very high average power while the pulse energy is still at moderate levels, in other cases lower repetition rate pulses get more gain and get very high pulses energy and relatively large peak power. When these intense pulses are focused on some targets, very high light intensities are obtained, sometimes even greater than 1016 W/cm2.
Definition: The pump power when the laser oscillation threshold is reached. The pumping threshold power of the laser refers to the pumping power when the laser threshold is satisfied. At this time, the loss in the laser resonator is equal to the small-signal gain. Similar threshold powers exist in other light sources, such as Raman lasers and optical parametric oscillators.
The main oscillator fiber amplifier (MOFA, MOPFA or fiber MOPA) is different from the main oscillator power amplifier (MOPA), which means that the power amplifier in the system is a fiber amplifier. The latter are usually high-power pumped cladding amplifiers, commonly produced using ytterbium-doped fibers.
The output power of the first fiber laser was only a few milliwatts. Recently, fiber lasers have developed rapidly, and high-power fiber amplifiers have been obtained. In particular, the output power of the amplifiers can reach tens of hundreds of watts, even in some single-mode fibers. on kilowatts. This is due to the large surface area to volume ratio of the fiber (to avoid excess heat) and the guided wave (waveguide) nature, which avoids the problem of thermo-optic effects at very high temperatures. Fiber laser technology is very competitive with other high-power solid-state lasers, thin-disk lasers, etc.
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