SFP series forty-fourth Week News Abstract 8

2011-10-28 17:05:16

Week News Abstract For SFP Series in 10GTEK
The abstract is mainly about the optical communication related products,including: FTTH,GPON,EPON,SFPPLC,PTN,ODN,Optical module,Optical devices,optical communications,Optical transceiver module,Etc.

FTTD the rapid development of plastic optical fiber
According to market research analysis in the next few years, the European optical manufacturers and other latest technologies to promote the company's strong, plastic optical fiber will show explosive forward.Plastic optical fiber to protect the smooth implementation of FTTH, PON equipment has been used in the case of a very mature, the capture of buildings and indoor FTTH fiber optic cabling into the promotion last storm. Community fiber to the desktop (FTTD) upgrade project, China's information infrastructure is greatly improved the ability to strive to achieve within three years, fiber-optic broadband network construction investment of more than 150 billion yuan, more than 50 million new broadband users development goals. At present, plastic optical fiber applications increasingly wide range of plastic optical fiber with a green, cheap, easy to operate and so, in addition to optical fiber into the outdoors, especially for China's optical fiber industry is also actively market opportunities, promote the ubiquitous plastic optical fiber network, Internet of Things related applications.At the same time, new energy technology, connectors, and the continuous development of optical fiber, which extends the field of plastic optical fiber in a number of applications. Applied to short distance transport of plastic optical fiber for the factory continued to bring in revenue. It is reported that less than 100 meters transmission distance high-speed network link speeds up to 20Gbps but also its use of plastic optical fiber.It is obvious that the current domestic and international markets are very optimistic about the prospects for the development of plastic optical fiber market, both domestic triple play, FTTH advance, or foreign demand for industrial control and medical applications, will contain a great market demand for plastic optical fiber, the excellent characteristics of plastic optical fiber, optical fiber has been making it at home and abroad market, "Beloved." Plastic optical fiber-based products already have the technical conditions, technical upgrading and proved to be a combination of environmental protection, appropriate to develop.The past two years with the communications industry, the implementation of national policy, China's FTTH pilot project from the beginning to the present scale deployment has been rapid development. It bears great potential for growth, will become the main driver of market growth, optical communications industry will undoubtedly bring to life and challenges, but also to optical communication enterprises once again the rapid development of space.
Single-mode fiber – Characteristics
 1 attenuation coefficient a: the physical meaning of its provisions with the same multi-mode fiber.(2) dispersion coefficient D (?): the fiber dispersion can be divided into three parts, mode dispersion, material dispersion and waveguide dispersion. For single-mode fiber, since the implementation of the single-mode transmission so there is no mode dispersion problems, so the dispersion mainly as material dispersion and waveguide dispersion (collectively referred to within the dispersion model). Considering the single-mode fiber dispersion and waveguide dispersion of the material, referred to the dispersion coefficient. Dispersion coefficient can be understood: as units per kilometer of fiber-optic spectral width of the pulse broadening caused by the value. Thus, L km of optical fiber dispersion caused by the pulse broadening values??: ? = ?? · D (?) · L (2.17) of which: ?? as the light source spectral width ? is the root mean square value of the dispersion coefficient of broadening the smaller the better. The fiber dispersion coefficient, the greater the coefficient means that the bandwidth the greater transmission capacity.3 mode field diameter d: characterization of single-mode fiber mode field diameter of concentrated light energy level. Since only the fundamental mode in single-mode fiber during the transmission, so roughly speaking, is the mode field diameter single-mode fiber receiver in the fundamental mode spot diameter of the surface (in fact there is no apparent fundamental mode spot boundary), mode field diameter d and similar to single-mode fiber core diameter.4 cut-off wavelength ?c: When the fiber normalized frequency V is less than the normalized cutoff frequency Vc, the single-mode transmission can be achieved, that is only in the fundamental mode in fiber transmission, all the rest of the high-order mode cut-off. In addition to fiber parameters such as core radius, numerical aperture must meet certain conditions, to achieve single-mode light-wave transmission must also grew up in a value, that is, ? ? ?c, this value is called the single-mode optical fiber cut-off wavelength. Therefore, the cutoff wavelength ?c is the meaning, can achieve single-mode optical fiber transmission minimum operating wavelength. In other words, even though other conditions are met, but if you grow up in single-mode fiber optical wave cut-off wavelength, still can not be achieved single-mode transmission.5 Return Loss --- ReturnLoss: reflection loss, also known as return loss, it is pointed out that the light side, after the reflected light relative to the input ratio in decibels of light, the greater the return loss as possible to reduce the reflected light of the light source and the impact of the system.
Optical network architecture
The basic structure of the type of optical network with a star, bus type (including ring) and the other three tree species, can be combined into a variety of complex network structures. Transverse optical network can be divided into the core network, metro / access networks and local networks. Network structure tend to use the core network, metro / local network to use more ring structures, access network will be a combination of ring and star-shaped composite structure. Optical network can be vertical stratification of client layer, optical channel layer (OCH), optical multiplex section layer (OMS) and optical transmission section layer (OTS) and other layers. Between two adjacent layers constitute a client / server layer relationship.Client tier: customers from a variety of different signal formats (such as SDH, PDH, ATM, IP, etc.).Optical channel layer: a variety of different formats for the transparent transport layer signals to customers to provide end to end networking of optical channels, this layer is also generated and inserted the optical channel configuration overhead, such as wavelength markers, port connectivity, load signs (rate , format, line coding) and wavelength protection, etc. this layer contains OXC and OADM-related functions.Recovery of the layer: the multi-wavelength optical signal to provide networking capabilities, including the insertion of various sections to ensure signal integrity layer overhead, and multiplex section layer provides survivability, wavelength multiplexers and efficient cross-connector is this layer.Optical transmission section layer: optical signals in a variety of optical media (such as G.652, G.653, G.655 fiber) to provide transfer functions, the functions provided by optical amplifiers belong to this layer.From the applications point of view, optical network will follow the "local network backbone network ? ? ? Metro ? CPN access network," the gradual penetration of the order.
The above information is edited by 10GTEK.

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