About Optical Communication
Oct 20, 2022| About Optical Communication
With the continuous development of communication technology, optical communication has been developed to meet the growing demand of people for broadband services such as integrated communication services and multimedia communication services. It solves the bottleneck of the transmission bandwidth of the transmission system in the communication network.
Throughout the development experience of the transmission system in the communication network, in order to meet the growing demand for transmission bandwidth, the transmission system has generally experienced a cycle of wireless communication → wired communication -+wireless communication → wired communication, and this cycle of process just reflects the continuous and rapid increase of transmission bandwidth. The representative of the - th wireless communication era is the telegraph communication technology, which was developed many centuries ago. Its transmission bandwidth is only a few hundred baud, and its business is very simple. The representative of the - th cable communication era is the carrier communication technology, which was a thing of the last century. At that time, the open line (iron, aluminum, copper) carrier and cable (coaxial) carrier equipment were the main force of long-distance transmission. The open line carrier can provide dozens of sessions, and the cable carrier can provide up to 10000 sessions. The services provided are mainly voice based, and can also provide low baud data services. The representative of the second wireless communication era is microwave communication technology, which should be in the middle and late last century. The transmission bandwidth of microwave communication has been greatly improved. One of its wireless channels can transmit nearly 200 Mbit/s (the fourth power group of PDH). It can not only provide voice and data communication services, but also provide broadcast level TV signal transmission. The representative of the second wired communication era is optical fiber communication technology. The large-scale application should be at the turn of the 20th and 21st centuries. The bandwidth capacity provided by optical communication is unimaginable (at present, the total information transmission rate of a pair of optical fibers can reach thousands of Gbit/s, which is expected to be improved). The services provided can include all current communication services. The communicator should note that when the communication transmission technology is developed to the optical fiber communication technology, it is not only a wide transmission band and large transmission capacity, but also the networking and application capabilities of optical fiber communication. Both carrier communication and microwave communication mentioned above are mainly used for point-to-point long-distance transmission. The networking is simple and the use is simple. Optical fiber communication can not only form a chain network, but also form a ring network (self-healing ring). Self healing ring technology in optical communication is a very important and useful technology. In addition, from the perspective of application, optical communication can be used for subscriber local area network (CPN), local area network (LAN), metropolitan area network (MAN), access network (AN), long-distance backbone transmission network, etc. It can be predicted that the optical communication network in the future will not only be used for optical transmission, but also can realize optical switching, thus forming an all-optical network.