In communications, Four Wave Mixing (FWM) is a coupling effect between light waves caused by the third-order polarization real part of the fiber medium. It is caused by the interaction of two or three light waves of different wavelengths at other wavelengths. The production of so-called mixing products, or new light waves in the sidebands, is a parametric nonlinear process. The reason for the four-wave mixing is that the light at a certain wavelength of the incident light will change the refractive index of the optical fiber, and the phase of the light wave will be changed at different frequencies, resulting in a new wavelength.
Optical fiber splice, which connects two optical fibers permanently or detachably, and has a splice part for protecting the components. The optical fiber splice is the end device of the optical fiber. The optical fiber connector is a physical interface used to connect an optical fiber cable. FC is the abbreviation of Ferrule Connector. The external reinforcement method is a metal sleeve and the fastening method is a turnbuckle. The ST connector is usually used for 10Base-F, and the SC connector is usually used for 100Base-FX.
Single-frequency fiber lasers have unique properties such as ultra-narrow linewidth, adjustable frequency, ultra-long coherence length, and ultra-low noise. The FMCW technology on microwave radar can be used for ultra-high-precision coherent detection of ultra-long-distance targets. Change the market's inherent concepts of fiber sensing, lidar and laser ranging, and continue to carry out the revolution in laser applications to the end.
Ultrafast laser is a kind of laser based on SESAM, Kerr lens and other mode-locking technology, the pulse width is in the order of ps or even fs.
When the incident light flux leaves from the illuminated surface or the incident surface of the medium to the other side, the ratio of the radiant energy projected and transmitted through the object to the total radiant energy projected on the object is called the transmittance of the object. The percentage of radiant energy reflected by an object to the total radiant energy is called reflectivity.
Semiconductor laser is a kind of laser developed in the 1960s, using semiconductor materials as working materials. Since the end of the 1970s, semiconductor lasers have clearly developed in two directions. One type is information-type lasers for the purpose of transmitting information, and the other type is power-type lasers for the purpose of directly using the optical power of the output laser.
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