According to the "CCTV News" reported the day before yesterday, the Ministry of Industry and Information Technology comments on the implementation of the "Broadband China" 2015 special operations, said this year will add fiber to the home covered 80 million families, the new 4G base stations more than 600,000.

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.