Fiber is a core refractive index higher than that of the cladding of the coaxial cylindrical dielectric waveguide. The main component of the core material is doped silica or plastic.

Dispersion is due to light waves in different frequency components at different transmission speeds to produce a physical effect of different time delays. Digital transmission, dispersion caused by the optical pulse broadening, resulting in around pulse overlap, causing ISI mathematics signals, resulting in increased error rate; for analog transmission, it will limit the bandwidth, harmonic distortion, making SNR system decreases. Dispersion including material dispersion, waveguide dispersion, mode dispersion, polarization mode dispersion, and other.

Data center / cloud computing system needs higher bandwidth and lower power consumption and more urgent, AOC is one of the best solutions to meet this demand. AOC (active optical cables) compared with the copper interconnect has many significant advantages, such as lower on the system link transmission power, weighs only a quarter of direct-attached copper, copper-half volume slightly, and room cabling system has better air flow heat dissipation than copper cable bend radius can be made smaller, over longer distances (up to 100 to 300 meters), and the error rate is also better transmission performance , BER can reach 10 ^ -15. Compared with the optical transceiver module, AOC is not exposed due to the presence of optical interface, optical interface clean and contaminated problem does not exist, the system greatly enhanced stability and reliability, and reduce maintenance costs the engine room.

Active Optical Cable Products is one of the main interconnection between these core devices, the active optical cable market research report from CIR's display, its market size in 2012 reached $ 720 million, this figure is expected to double by 2017, reaching $ 1.9 billion, promising.

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

Now a lot of the network, subject to the fiber aging, terrain reasons, loaded dimensional factors and other reasons, PON network led to the loss of light is too large, making it impossible to meet the receiver sensitivity between ONU or near zero cutoff, so that the terminal network connection is unstable or can not opening and so on.

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.

DWDM Transceiver, as its name suggests, is a kind of optical transceiver which combines the DWDM 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.