Design And Realization Of Optical Fiber Automatic Bypass Device

The construction of Chinese long-distance backbone network has changed from the industrial monopoly of China Telecom to the competition between China Unicom, CMCC (China Mobile Communication Corporation) and China Telecom. All operators have been already built or are building their individual backbone transmission networks in accordance with their own corporate situation and development planning; meanwhile, they are taking different safeguarding means and measures to guarantee the normal operation of all kinds of businesses. Smooth communication is an issue concerning the national economy and the people’s livelihood; therefore, to guarantee the normal operation of communication is of significant importance. However, potential safety hazards are inevitable in the current communication network. We should give priority to the improvement of user perception and the security of transmission network in order to build an excellent network. The constructed transmission network must have strong survivability and self-healing property to guarantee the normal operation of business when the electricity is turned off.Optical fiber protection method existing in our country is mainly based on optical protection, i.e. optical power real-time monitoring of equipment optical terminal value, if the broken fiber from device to switch to the standby line, in order to guarantee the normal communication, but this approach also appeared a lot of problems, when the base station itself occurred when power cut device is not working properly, cannot switch to the standby line, make the communication interrupt. This paper designed a optical bypass device, which is an intelligent optical path switching system applied in the field of optical fiber communication and can automatically bypass the fault node in the network, can automatically identify the network node power supply state and optical signal output state, when the failure of a local optical equipment (including power supply interruption, hardware or software failure etc. after a moment,) can switch to bypass the light path. This design takes LPC1768as the core processor, a circuit to measure the optical power through the PIN photodiode design, and with the software to achieve the purpose of accurate monitoring of optical power. Through the DP83848C to realize the Ethernet communication function, and produced the Web server, can convenient parameter user by remote clients to real-time monitoring to modify the optical bypass device, and auxiliary configuration of the keyboard and LCD display module, through the matching of software users can also can change or situation monitoring device in the field.This thesis has designed a light bypass protector as required above, so that the system can instantly switch to a bypass when there is a power failure of the base station or the light path is abnormal, so that major failure of the base station caused by the outage or failure of the transmission device can be effectively avoided. The device, with the advantage of high reliability, fast switching speed and low cost, is a simple and effective solution.