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Experience Using Low Loss Fiber Optic Cable
- Feb 05, 2018 -

Hunan light al - : reported recently, according to the three network integration, IPTV new affairs, and the information such as large data processing need breakthrough, communication network bandwidth to the explosive increasing trend, the average annual increase rate of transmission bandwidth of backbone network to reach more than 50%. In 2013, with the continuous launch of 100G collection by the three operators, the backbone network has entered the 100G era. In order to get used to the rapid increase of network traffic, the fiber optic cable is expected to reach the 400G period by 2017. And fiber as fiber network construction of infrastructure, the use of full beyond 20 years, laying construction in place after it is difficult to change, so choose fiber need to think about its stature within the time limit for all network needs, so a low loss optical fiber market.

The development of ultra-low loss fiber.

In the category of ultra-low loss fiber, corning is the first. In 1970, the United States corning corporation has successfully developed a loss of 17 db/km low-loss quartz optical fiber, corning in 1972 and the loss of the fiber to 7 db/km, 1973, bell LABS invented by MCVD method of manufacturing optical fiber, optical fiber loss and drop to 2. 5 db/km. In 2011, at “ Electric power road ” In the project of the qinghai-tibet dc network, the state grid applies the ultra-low-loss fiber of corning to the longest span. The ultra-low loss optical fiber system has been recognized by the industry for its smooth operation and substantial decline in construction cost.

Domestic companies are also reluctant to show weakness in ultra-low-loss fiber. In 2014, two large useful areas were officially introduced to the market (the useful area is 110μ 130 m2, & mu; M2), the attenuation is less than 0. Low loss fiber of 184dB/km; Ultra low loss large usable area G. 654 fiber, G. 657. B3 fiber; A 400G ultra-low loss optical fiber was introduced. The low loss fiber of ztt-alf was introduced. Super low loss optical fiber, a major project of the 2016 industrial strong foundation project …

The application of ultra-low loss fiber.

According to fiber optic cable loss, the fiber can be divided into three types: general optical fiber, low loss fiber and ultra-low loss fiber. In the meantime, the general optical fiber attenuation is 0. 20dB/km, the attenuation of low loss fiber and ultra-low loss fiber is less than 0. 185dB/km, 0. 170 db/km. Compared with the general optical fiber, low loss and ultra-low loss fiber can be separated from the cutting cross section loss of 2dB and 3dB. Even if the span is constant, it increases the interval by 17 per cent and the total transmission interval by 17 per cent. About high-speed transmission network, 100 g, under the transmission rate of general optical fiber and low loss optical fiber, low loss optical fiber can transmit 1000 kilometers above, in addition to the individual long period, the existing general optical fiber can cope with; With respect to the transmission rate of 400G, the low loss fiber can reduce the number of regenerated stations by about 20%, and the ultra-low loss fiber can reduce the number of regenerated stations by about 40%, and the benefit is significant.

Compared with general optical fiber, outstanding characteristics of low loss optical fiber can provide network allowance, to expand the network transition span, amplification loci, upgrade to a faster bit rate, increase the flexibility of the network components, or extend the gap between the regenerator, thereby can end longer and wide area network, to need to satisfied with the global increasing bandwidth. The low loss characteristics of ultra-low loss fiber are very suitable for the application of ultra-long interval and large capacity, high rate network transmission, and thus produce a series of record application results. In 2010, China telecom, huawei and end by corning 100 g long interval of wavelength division multiplexing transmission experiment, the use of ultra low loss optical fiber over beyond 3000 km long transmission interval, invented the global terrestrial transmission system 100 GWDM transmission interval of the latest record. In addition, the low loss optical fiber not only widely used by the operators, thinking to low attenuation characteristics, state grid corporation in 2011 and put into production of qinghai-tibet ac/dc network engineering supporting use of ultra-low loss in optical fiber communication engineering, tuotuo river on end to & ndash; Ando's 300km super-long, non-electric relay light transmission.

In addition to the above advantages, the use of ultra-low loss fiber can greatly reduce the cost. The increase in transmission interval means that a reduction in the system's regeneration stations means that cutting a renewable station means saving tens of millions of yuan. "After 100G, the higher the system capacity, the greater the number of regeneration stations that can be saved by low-loss, ultra-low loss fiber." Wei leping, director of the China telecom science and technology commission, speculated in 2013 that "in the 400G period, compared to the general optical fiber, the low-loss fiber could be reduced by 20 per cent (about 2.5 billion RMB) of the 400G regeneration station. Ultra-low loss fiber can be cut by 40%.

With the advent of the 400G, the huge cost advantage of ultra-low loss fiber optic cable will become more and more obvious. The industry chain is in good condition, and ultra-low loss fiber will usher in a large-scale commercial era, and ultra-low loss optical fiber technology will be an important factor to advance the early arrival of the 400G. Trust ultra low loss fiber will be more widely used in future communication.