Multimode Fiber Optic Cable for local area network

Multimode Fiber Optic Cable for local area network

Due to the rapid development of local area networks and customer premises networks, a large number of integrated wiring systems also use multi-mode optical fiber cables instead of digital cables, so the market share of multi-mode optical fiber cables will gradually increase. The reason why multi-mode fiber optic cables are selected is that the transmission distance of the local area network is short. Although the price of multi-mode fiber optic cables is 50% to 100% more expensive than that of single-mode fiber optic cables, the optical devices it supports can be light-emitting diodes, and the price is lower than that of lasers. The tube is much cheaper, and the multimode fiber optic cable has a larger core diameter and numerical aperture, which is easy to connect and couple, and the price of corresponding connectors, couplers and other components is much lower. ITU-T has not accepted the 62.5/125μm multimode fiber optic cable standard, but it is still widely used due to the needs of the development of local area networks.

The G.651 optical fiber cable recommended by ITU-T, that is, the standard multimode optical fiber cable of 50/125 μm, has a smaller core diameter and corresponding difficulties in coupling and connection. It is rarely used in most countries in North America and Europe. In response to these questions, some companies have implemented improvements and developed a new type of 5O/125μm fiber optic cable graded (G1) fiber optic cable, which is different from the gradient refractive index distribution of the traditional 50/125μm fiber optic cable core. The normal distribution has been adjusted to match the use of the two windows of 850nm and 1300nm. This improvement may find a new market for the application of 50/125pm fiber optic cable in the local area network.