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.
Fiber laser refers to a laser that uses rare-earth-doped glass fiber as the gain medium. Fiber laser can be developed on the basis of fiber amplifier: high power density is easily formed in the fiber under the action of pump light, resulting in laser The laser energy level of the working substance is "number inversion", and when a positive feedback loop (to form a resonant cavity) is properly added, the laser oscillation output can be formed.
Optical fiber is the abbreviation of optical fiber, and its structure is shown in the figure: the inner layer is the core, which has a high refractive index, and is used to transmit light; the middle layer is the cladding, and the refractive index is low, forming a total reflection condition with the core; the outermost The layer is a protective layer to protect the optical fiber.
Fiber coupled diode lasers provide researchers with a convenient way to couple the output of the laser to the fiber. This allows it to be delivered to specific areas, for example, fiber-coupled lasers used for skin treatment in specific areas of the skin.
Optical fiber amplifier is a new all-optical amplifier used in optical fiber communication line to realize signal amplification. According to its position and function in the optical fiber line, it is generally divided into relay amplification, pre amplification and power amplification.
As an important part of optical fiber communication system, optical module plays the role of photoelectric conversion. This article will introduce the core devices of the optical module.
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