New fiber optic cable

In order to adapt to the need of the market, optical fiber technology indexes in the continuous improvement, all kinds of new fiber to emerge.

1, long distance of optical fiber
Main are some great effective area, low dispersion maintenance of new G-655 optical fiber, the PMD value is extremely low, can make the existing transmission system capacity easily upgrade to 10 ~ 40 Gbit/s, and facilitate the distributed on optical fiber Raman effect amplifier, make the light signal transmission distance greatly extended. Used for 10 Gbit/s more DWDM systems, very suitable for allegedly Raman amplifiers development and application. Alcatel cable launched Teralight Ultra optical fiber, according to have transmission 100 km above the length of single channel 40 Gbit/s, a total capacity of 10.2 Tbit/s record. And some companies develop effective area of big negative dispersion of optical fiber, improve the nonlinear index of the requirements, and the dispersion compensation scheme of simplification, in long distance without regeneration of transmission performance very good performance, in long distance communication of undersea optical cable effect is very good also.

2, low water peak optical fiber
In the design of man need to consider the simplified equipment and cost reduction, also need to consider the WDM technology (CWDM) the application possibility. Low water peak optical fiber in 1360 ~ 1460 nm extensions of the band that bandwidth is greatly expand, make CWDM systems are greatly optimization, increased the transmission channel, increase the transmission distance. Some of the design may not only requires the man of optical fiber water peak low, also requires optical fiber has a negative dispersion value, on the one hand, can offset light source the light of the device is dispersion, on the other hand can mix with this negative dispersion optical fiber and the G-652 optical fiber or G-655 standard fiber, and use it to do the dispersion compensation, so as to avoid the complex dispersion compensation design, the cost savings. If in the future man fiber Raman amplification technology, this kind of network will have a clear advantage. But after all the standard of man is not mature yet, so the man of the specifications of the optical fiber will man with the change of pattern of constantly changing.

3, new multimode fiber
Local area network transmission distance is short, although multimode fiber single-mode optical fiber prices than your 50% ~ 100%, but it is the light of the supporting device can choose leds, and the price is much cheaper than laser tube, and multimode fiber have larger core diameter and numerical aperture, easy to connect and coupling, the corresponding connectors, couplers components and much lower prices. ITU-T has not accept 62.5/125 μ m type multimode fiber standards, but due to the needs of the development of the local area network, it still got widely used. And the ITU-T recommend the G-651 optical fiber, namely μ m standard 50/125 multimode fiber, its core diameter, lesser, coupling and connection corresponding some difficulties, although in some European countries and Japan have some applications, but in North America and Europe most countries very rarely used. To solve these problems, the existing company has developed by improving the new type of 5 O / 125 μ m optical fiber gradient type (G1) of optical fiber, different from traditional μ m uv exposure.when 50/125 of the core gradient refractive index distribution, it will bandwidth of normal distribution has been adjusted to match the 850 nm and 1300 nm two window, the application of this improvement is likely to optical fiber in the local area network use 50/125 PM find new markets.

4, hollow fiber
According to reports, some American companies and university research institutes are developing a new wave of optical fiber, namely the air just in optical fiber transmission enough. In theory, this kind of optical fiber no fiber core, reducing the attenuation, increased communication distance, prevent the dispersion of interference phenomenon in, can support more band, and it allows strong light power injection, expects its communication can reach 100 times the current optical fiber. The European and Japanese some industry insiders are also keen on this technology development, more and more studies prove hollow fiber seems to be possible. If really, practical, and can solve the existing optical fiber transmission system of long distance, and greatly reduce the cost of communication. But, this kind of optical fiber use rise will still meet many difficult problems, such as the stability of the optical fiber, side pressure properties and the increase of bending loss, etc.