Monday, July 25th, 2011 at 6:00 am ?
The past and future optical fiber communication ? Optical Fiber Communications ? Communications Industry
History of the world?s optical fiber communication
Fiber invention caused a revolution in communications technology, constitute the coming 21st century information society is a major factor.
1966 was born in Shanghai, China, Chinese British Kao, published papers, ?Optical Frequency Dielectric fiber surface waveguides,? made of quartz glass fiber (fiber) transmitting light signals to communicate, enabling long-distance, large-capacity communication .
20db/km loss in 1970 developed out of fiber. Corning said to cost 30 million U.S. dollars, by 30 m fiber sample, that is very worthwhile. The breakthrough has caused shock throughout the communications industry, the world?s developed countries to put into a huge force of optical fiber communications. In 1976, the United States in Atlanta to Washington, Bell Labs has established a world?s first practical fiber-optic communication lines, rate of 45Mb / s, using the multi-mode fiber, using a LED light source LED, the wavelength is 0.85 microns infrared light. In the late 70s of last century, large-capacity single-mode fiber and long-life semiconductor lasers developed. Optical fiber communication systems are beginning to show long-distance, high-capacity incomparable superiority.
By theoretical calculation: the optical communication wavelength of 1.3 micron and 1.55 commonly used micron wavelength window of the capacity of at least 25000GHz. Naturally think of using multi-wavelength WDM WDM (WavelengthDivisionMultiplex). WDM technology breakthrough in 1996, Bell Labs developed the WDM technology, the U.S. company MCI in 1997, opened a business in the WDM line. Speed optical fiber communication system from a single wavelength of 2.5Gb / s and 10Gb / s to the explosive development of multi-wavelength of the Tb / s (1Tb / s = 1000Gb / s) transmission. Optical Systems Laboratory rate today has reached 10Tb / s, almost inexhaustible, its brilliant future. History of the Chinese optical fiber communication
]]>
1973, the world?s optical fiber communication has not yet practical. Wuhan Research Institute of Posts and Telecommunications Ministry of Posts and Telecommunications (University of Posts and Telecommunications, Wuhan at that time) began to study optical fiber communication. Wuhan Research Institute of Posts and Telecommunications as using quartz optical fiber, semiconductor lasers and the correct coding standard communication equipment technical route, so that optical fiber communication technology in the development of our country less quite a few detours, so that optical fiber communication in high-tech in China and developed countries with smaller gaps.
Our research and development of optical communication is in the period of ten years of chaos, in a closed state. Foreign technology can not learn the basic, purely their own way, everything their practice, including fiber optic, optoelectronic devices and optical fiber communication systems. The development of optical fiber, the raw material purification, melting lathe, wire drawing machines, including fiber optic test instruments and tools are all to continue their development extremely difficult. Wuhan Post and Telecommunications Research Institute, has taken into account the final optical fiber communications can be used in economic construction, the first comprehensive study, in addition to development of optical fiber, it also launched optoelectronic devices and optical fiber communication system, so that our country still has a complete fiber-optic communications industry.
1978, after years of reform and opening up, optical fiber communication greatly accelerate research and development work. Shanghai, Beijing, Wuhan and Guilin have developed a test optical fiber communication systems. Ministry of Posts and Telecommunications in 1982, key research project ?82 Project? launched in Wuhan. The project is called practical projects, and demand is a commercial product, not all test materials, to meet the international CCITT standards, to the Design Institute of design, construction workers, rather than the construction of scientific and technical personnel. Since then, China?s optical fiber communication step.
The mid 80s in the 20th century, the digital optical fiber communication has reached a rate of 144Mb / s, can send 1980 Road, telephone, over coaxial cable carrier. As a result, optical fiber communication widely adopted as a mainstream, replacing all the transmission lines on the cable. Through the state, ?June 5?, ?Plan?, ?Eighth Five-Year? and the ?Ninth Five-Year Plan?, China has established ?eight vertical and eight horizontal? trunk network, connected provinces, regions and municipalities.
I am a professional editor from Hardware Wholesale, and my work is to promote a free online trade platform.
http://www.hardware-wholesale.com/ contain a great deal of information about
chinese exercise ball , fishing reel handle
welcome to visit!
Tagged with: Communication ? Communications ? Fiber ? future ? industry ? Optical ? past
Filed under: Optical Fiber Technology
Like this post? Subscribe to my RSS feed and get loads more!
wilco wilco latest news latest news star news star news todays news
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.