Optical fiber communication is the main transmission means of modern communication networks. Its development history is only one or two decades. It has experienced three generations: short-wavelength multimode fiber, long-wavelength multimode fiber and long-wavelength single-mode fiber.The use of optical fiber communication is a major change in the history of communications. At present, China’s optical fiber communication has entered a practical stage. In addition, many countries have announced that they will no longer build cable communication lines and are committed to the development of optical fiber communication.
Introduction to Optical Fiber Communication
The so-called optical fiber communication uses optical fiber to transmit light waves carrying information to achieve communication purposes. In order to make a light wave a carrier carrying information, it must be modulated, and the information is detected from the light wave at the receiving end.As a technology, optical fiber communication has a history of 30 to 40 years, but it has completely changed the face of world communication, and its future development is immeasurable.
Principle of optical fiber communication and transmission
The principle of optical fiber communication: at the transmitting end, the transmitted information (such as voice) is first converted into an electrical signal, and then modulated onto the laser beam emitted by the laser, so that the intensity of the light changes with the amplitude (frequency) of the electrical signal, and Send out through the fiber. At the receiving end, the detector receives the optical signal and converts it into an electrical signal, which is demodulated to restore the original information.
Advantage
(1) The communication capacity is large and the transmission distance is long.
(2) The loss of fiber is extremely low.
(3) Small signal interference and good confidentiality.
(4) Anti-electromagnetic interference, good transmission quality.
(5) The fiber is small in size and light in weight, which is easy to lay and transport.
(6) Rich in materials and environmental protection, it is conducive to saving non-ferrous metal copper.
(7) No radiation, it is difficult to eavesdrop.
(8) The cable has strong adaptability and long life.
Disadvantage
(1) The texture is brittle and the mechanical strength is poor.
(2) The cutting and splicing of optical fibers requires certain tools, equipment and techniques.
(3) Splitting and coupling are not flexible.
(4) The bending radius of the fiber optic cable should not be too small (>20cm).
(5) There is a problem with power supply difficulties.
Development forecast of optical fiber communication
Nowadays, the sales volume of optical fiber communication equipment and optical cable in China is increasing every year. In many rural areas of many provinces and cities in China, the construction of mobile communication is still in a blank. In addition, with the development of broadband services and the need for network expansion, future optical fiber communication The market is vast.