1580nm DFB Butterfly Laser Diodes Manufacturers

Coarse Wavelength Division Multiplexing (CWDM) allows multiple signals to be transmitted simultaneously over a single optical fiber by using a different wavelength of light to carry each signal. CWDM operates in the wavelength range of 1270nm to 1610nm, with each CWDM channel typically spaced 20nm apart.

A pump laser is a laser used to provide an excitation light source for a fiber laser or fiber amplifier. The emission wavelength of a 980nm pump laser is approximately 980 nanometers (nm).

Raman fiber amplifier (RFA) is an important part of dense wavelength division multiplexing (DWDM) communication system. In many nonlinear optical media, the scattering of pump light with a shorter wavelength causes a small part of the incident power to be transferred to another beam whose frequency is shifted down. The amount of frequency shift down is determined by the vibration mode of the medium. This process is called pulling Mann effect. If a weak signal and a strong pump light wave are simultaneously transmitted in the fiber, and the weak signal wavelength is placed within the Raman gain bandwidth of the pump light, the weak signal light can be amplified. This mechanism is based on stimulated Raman scattering The optical amplifier is called RFA.

Laser welding technology is a fusion welding technology that uses a laser beam as an energy source to make it impinge on the weldment joint to achieve the purpose of welding.

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.

Operators are making efforts to build 5G base stations, and the demand for optical modules continues to expand. In 2019, my country has built more than 130,000 5G base stations. 2020 is the first year of large-scale construction of 5G base stations, which mainly cover urban areas. In 2020, 5G network construction will focus on more SA networking, with higher commercial value. During the two sessions in 2020, the Ministry of Industry and Information Technology stated that my country added more than 10,000 base stations every week. According to the operator's investment plan, the three major operators will build 700,000 base stations in September 2020, and the construction will not stop from September to December. With China Radio and Television as a new entrant, the joint construction of 700MHZ 5G base stations with China Mobile is expected to be further expanded.