Direct modulation of semiconductor lasers is to modulate the laser by superimposing the pre-modulated (AM, FM, PCM) signal current on the bias current of the laser. Because it is to change the intensity of light, it is also called intensity modulation. For digital transmission, although the speed is very high, only two working states of optical signal or non-optical signal are ...

Erbium-doped fiber amplifier (EDFA) uses Erbium ion as medium to realize energy conversion. The working wavelength window of energy amplification is 1550 nm and the width is 50 am, which coincides with the low loss window of optical fiber. The energy injection window is 980 nm and 1480 nm.

TDLAS is the abbreviation of Tunable Diode Laser Absorption Spectroscopy.

TDLAS technology is essentially a spectral absorption technology. The concentration of gas can be obtained by analyzing the selective absorption of laser by gas. It differs from traditional infrared absorption technology in that the spectral width of semiconductor lasers is much smaller than that of gas absorption lines.

Although both spectrum and spectrum are electromagnetic spectra, the analysis methods and testing instruments of spectrum and spectrum are quite different because of the difference of frequency. Some problems are difficult to solve in the optical domain, but it is easier to solve them by frequency conversion to the electrical domain.

DFB: Distributed Feedback Laser.

Local Area Network (LAN) refers to a group of computers interconnected by multiple computers and other devices in a certain area. They are physically apart from each other to allow users to communicate with each other and share such as printers and storage. A system in which computing resources such as devices are interconnected.

The parameters affecting the cutting quality are: cutting height, cutting nozzle model, focus position, cutting power, cutting frequency, cutting duty ratio, cutting pressure and cutting speed. Hardware conditions include: protective lens, gas purity, sheet quality, focusing mirror and collimating mirror.