An optical fiber sensor is a sensor that converts the state of the measured object into a measurable light signal. The working principle of the optical fiber sensor is to send the incident light beam from the light source into the modulator through the optical fiber. The interaction between the modulator and the external measured parameters determines the optical properties of the light, such as the intensity, wavelength, frequency, phase, polarization state, etc. It changes and becomes a modulated optical signal, which is then sent to the optoelectronic device through the optical fiber and passed through the demodulator to obtain the measured parameters. During the whole process, the light beam is introduced through the optical fiber, passes through the modulator, and then emitted. The role of the optical fiber is first to transmit the light beam, and secondly to act as an optical modulator.
Laser is a laser generating device and one of the core components in laser application equipment. As the core component of laser technology, lasers are strongly driven by downstream demand and have huge growth potential and broad application scenarios.
Fiber amplifier in a fiber optic data link, the amplification process that occurs over a very long transmission fiber.
A diode laser in which the light generated is coupled into an optical fiber.
Energy is absorbed in the medium, creating excited states in the atoms. Population inversion is achieved when the number of particles in an excited state exceeds the number of particles in the ground state or less excited states. In this case, a mechanism of stimulated emission can occur and the medium can be used as a laser or optical amplifier.
Some laser applications require the laser to have a very narrow linewidth, that is, a narrow spectrum. Narrow linewidth lasers refer to single-frequency lasers, that is, there is a resonant cavity mode in the laser value, and the phase noise is very low, so the spectral purity is very high. Typically such lasers have very low intensity noise.
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