Optical fiber communication wavelength range: 0.8μm ~ 1.7μm (frequency 1.76 * (10 ^ 14) to 4.75 * (10 ^ 14))

Optical fiber communication: it refers to the light as an information carrier, optical fiber as the transmission medium of communication. 

 The so-called all-optical network, refers to the entire process of data transmission between the exchange from the source node to the end-user nodes in the optical domain, namely a complete end to end optical path with no electrical intervention.

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DWDM is an optical fiber communication transmission technology, it is the use of an optical fiber can simultaneously transmit a plurality of different wavelengths of light characteristic wavelength range into the fiber may be applied to a number of bands, each band used a separate channel to transmit a predetermined wavelength of the optical signal technology.

According to the Ministry statistics, from January to June this year, the national new 1.386 million kilometers of optical cable, optical cable line total length of 18.838 million kilometers, an increase of 18.1%, 4G network to promote the rapid development of optical fiber and cable industry.

By 2014, broadband policy progresses, broadband infrastructure has improved, continue to promote the construction of transmission network, "Light of Copper" trend more apparent, while 4G construction in full swing, the optical communications industry steadily.

Optical communication is the physical basis of the entire Internet economy. The beginning of the century, the Internet bubble crisis, the optical communication industry closely related also suffered heavy losses, optical communications giant great loss of strength, Nortel, Lucent since almost brought to its knees. That time foreign optical communications giants are mostly vertically integrated development model, from device to device chips are able to completely independent research and design. After the bubble crisis, in order to preserve the core competitiveness, equipment manufacturers have stripped optical components businesses to form an independent company, or sold to independent manufacturers of optical devices, optical fiber business has been stripped. Optical Communication born light system equipment - fiber-optic cable - optical devices - optical chips complete industrial ecology.

It is well known in the optical communications optical module dominate, and photonic chip is the heart of the optical module is the core of the optical communication system. Photonic chip strength, represents a country, a company's optical communications technology. Therefore, when the industry proud, "Optical communication is a Chinese high-tech and advanced level in the gap in the world one of the smallest fields," when we need a critical analysis of this sentence.

Single-mode fiber is only a single path, and generally used for long-distancetransmission, there are multiple propagation paths of Multimode Fiber, multimodefiber bandwidth for 50MHz~500MHz/km, single mode fiber optic bandwidth up to2000MHz/km, optical fiber wavelength 1550nm and 850nm,1310nm, etc.