DWDM transmission system composition and technology
he development of optical fiber transmission technology has entered the DWDM (Dense Wavelength Division Multiplexing) stage after PDH and SDH. The DWDM system has constant transmission distance, large capacity, multiple channels, fully transparent transmission, and can form an all-optical layer network. The technical and economic advantages such as relatively low engineering cost have been widely used at home and abroad.
In the intermediate optical signal transmission stage of the DWDM system, after the optical signal is transmitted for a certain distance along the optical fiber, it will be weakened due to the attenuation characteristics of the optical fiber, which limits the transmission distance. In order to make the optical signal transmit farther, the optical signal must be enhanced. This requires the use of erbium-doped fiber amplifier EDFA to realize the optical amplification function. In the DWDM transmission system, the applications of fiber amplifiers include: line amplifiers, preamplifiers and booster amplifiers.
The working principle of the DWDM optical fiber transmission system is that the optical transmitter at the transmitting end sends out optical signals with different wavelengths but with accuracy and stability that meet certain requirements. The optical wavelength multiplexer multiplexes them together and sends them to the erbium-doped fiber power amplifier BA (erbium-doped fiber). The amplifier is mainly used to compensate for the power loss caused by the multiplexer and increase the transmission power of the optical signal), and then send the amplified multiple optical signals into the optical fiber for transmission. In the middle, you can decide whether to add an erbium-doped fiber line amplifier LA according to the situation. After the receiving end is amplified by the erbium-doped fiber preamplifier PA (mainly used to improve the receiving sensitivity to extend the transmission distance), it is sent to the optical wavelength demultiplexer to decompose the original optical signals.
MIC Technology Group is a high-tech enterprise in China. We specialize in the R&D, manufacture and marketing of optical transmission products, all kinds of RF amplifiers and head-end equipment. Our company has set up our own branches and sales agencies to offer our products and after-sales services throughout the country. Moreover, our company has expanded overseas markets, including Southeast Asia and Eastern Europe. Relying on rich experience, we are capable of providing tailor made products and services for each customer. We are making great efforts to strive for the highest quality, the best services and the greatest satisfaction for customers.
Established in 1988, MIC Technology Group has been specializing in the R&D, manufacturer, sales and technical service of optical transmission equipment in the CATV field for more than 20 years. Our Main product include RF ampllifiers, head-end equipment, optical transmitters and receivers. Covering the area of about 2,400 square meters, with more than 150 staffs member, equioped with 4 assembing lines, besides, we also have a strong team of including 20 R&D technicians, which give us strong capacity of providing tailor made products for different customers. Moreover, we have build local offices and agencies throughout the country to provide product with service. Now, our product has been exported to many countries in the world, such as Philippines, Singapore, Thailand, Bulgaria, Russia etc. Believe us, we can make great efforts to provide the highest quality, the reasonable price, the fastest delivery with better service.