Abstract
We propose and experimentally demonstrate a method for fault location in optical communication network. This method utilizes the traffic signal transmitted across the network as probe signal, and then locates the fault by correlation technique. Compared with conventional techniques, our method has a simple structure and low operation expenditure, because no additional device is used, such as light source, modulator and signal generator. The correlation detection in this method overcomes the tradeoff between spatial resolution and measurement range in pulse ranging technique. Moreover, signal extraction process can improve the location result considerably. Experimental results show that we achieve a spatial resolution of 8 cm and detection range of over 23 km with -8-dBm mean launched power in optical network based on synchronous digital hierarchy protocols.
Highlights
For the high-speed, large-capacity communication networks at present, instantaneous faults in transmission line will lead to service interruption and mass data loss
We propose and experimentally demonstrate a method for fault location in optical communication network
This method utilizes the traffic signal transmitted across the network as probe signal, and locates the fault by correlation technique
Summary
For the high-speed, large-capacity communication networks at present, instantaneous faults in transmission line will lead to service interruption and mass data loss. The troubleshooting in optical networks has attracted extensive attentions [1,2,3]. Conventional method uses optical time-domain reflectometer (OTDR) to detect faults. An OTDR usually excites an optical pulse at a fixed wavelength as probe light, which is only suitable for locating the fault in single transmission line. Some wavelength-tunable OTDR has been proposed recently for wavelength-division-multiplexing passive optical network (WDM-PON) [4,5,6,7,8]. Considering the wide constructed optical access networks like fiber-to-the-home/building, the fault location requires a large number of OTDRs which will incur great maintaining cost
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