The micro fiber is encapsulated in a plastic jacket, which makes it bent rather than broken. Usually one end of the optical fiber transmitting device using a light emitting diode (light emitting diode, LED) or a laser light pulses will be sent to the optical fiber and the other end of the optical fiber receiving device using photosensitive element to detect pulse.In daily life, the transmission loss of light in the optical fiber is much lower than that of the conduction in the wire, and the optical fiber is used as the long-distance transmission of the information.. The two terms of the fiber optic cable and fiber optic cable are often confused. Most must be covered by several layers of optical fiber protection structure before use, the coated cable is called cable. The protective layer and the insulation layer of the fiber optic layer can prevent the damage of the fiber from the surrounding environment, such as water, fire, electric shock, etc.. Cable is divided into: cable skin, aramid fiber, buffer layer and fiber optic. The fiber is similar to the coaxial cable, but no mesh shielding layer is. The center is the glass core of the light.. In the multimode fiber, the core diameter is 50 m and 62.5 m two kinds, roughly with the thickness of the human hair is quite. The diameter of the single mode fiber core is 8 m~10 m, which is usually 9 / 125 m. The core is surrounded by a layer of glass envelope of low refractive index than the core, commonly known as the cladding, cladding layer makes the light remain in the core. Outside is a thin layer of plastic jacket, that is, the coating layer, used to protect the cladding layer. Fiber is usually bundled into a beam, outside the shell protection. The core is usually made of quartz glass cross-sectional area of a very small double concentric cylinder, it is brittle, easy to fracture, so need a protective layer. Explanation: 9 / 125 m refers to the core of the fiber is 9 m, the cladding is 125 m, 9 / 125 m is single-mode fiber is an important feature of the. 50 / 125 m pointed to the fiber core is 50 m, the cladding is 125 m, 50 / 125 m is one of the important characters of multimode fiber.

Which BRIC national fiber cable program is directly connected with the 5 BRIC countries submarine cable project, will start in early 2014, opening in 2015. The total length of the project is 34000 km, which directly connected 5 BRIC countries submarine cable length of about 24000 km.2013, the global 100G fiber optic revenue is expected to exceed 00000000 for the first time. The analysis in the first quarter of 2013 the global market for optical network financial results, found a number of trends, including a disappointing trend, that is, the overall market growth is still difficult and only the Japanese Fuji company profit is increasing year by year. Although fiber market in the first quarter appear recession is not uncommon, but the decline is concern is because the fifth quarter in a market decline, and revenue in the quarter reached the lowest value in six years.100G fiber situation is more optimistic, regardless of the chain, compared with the same period show strong growth. 2013 first quarter, 100G fiber shipments increased by 41% compared with the four quarter of 2012, revenue increased by four compared with the 24% quarter of 2012. In this calculation, the annual revenue is expected to exceed 00000000 for the first time. In the first quarter of 2013, 20 suppliers for sale of 100G fiber, there will be more manufacturers to join the market competition. Suppliers cautiously optimistic attitude, short-term orders bullish, long-term orders is not optimistic.