Views: 0 Author: Site Editor Publish Time: 2023-03-15 Origin: Site
The FP (Fabry-Perot) laser is a semiconductor luminous device that uses the FP cavity as a resonant cavity and emits a multi-velocity-related light. FP laser is mainly used for low -speed and short distance transmission. For example, the transmission distance is generally within 20 kilometers, the rate is generally within 1.25g, and the FP is divided into two wavelengths, 1310nm/1550nm.
At present, there are also some manufacturers in the market to make a module of Gigabit 40km in order to reduce costs. In order to achieve the corresponding transmission distance, they must adjust the light power. Essence According to the engineer's suggestion 1.25G 40km dual -fiber module, it is more secure to apply DFB devices!
Performance parameters of FP laser:
1) Work wavelength: The central wavelength of the laser emitting spectrum.
2) spectral width: multi -vertical laser, the balance of the root spectrum width.
3) Threshold current: When the operating current of the device exceeds the threshold current, the laser emits a good laser with a good coherent.
4) Output optical power: The light power emitted from the output port of the laser.
The DFB laser is used on the basis of FP laser using a grating consideration to make the device only have one vertical output. DFB (DISTRIBUTED Feedback Laser) generally uses two wavelengths of 1310nm and 1550nm, divided into refrigeration and non -refrigeration, mainly used for high -speed mid -to -long distance transmission. The transmission distance is generally above 40 kilometers or more
Performance parameters of dfb laser:
1) Work wavelength: The central wavelength of the laser emitting spectrum.
2) Side -mode suppression ratio: The power ratio of the main mode of laser work to the maximum edge.
3) -20DB spectrum width: The highest point of the output spectrum output from the laser is reduced by 20DB spectral width.
4) Threshold current: When the operating current of the device exceeds the threshold current, the laser emits a good laser with a good coherent.
5) Output optical power: The light power emitted by the output port of the laser.
