A precise measurement method for linewidth enhancement factor of SOA by Sagnac interferometer when considering XGM is presented. It needs neither spacial interference nor optical spectrum analysis, has simple configuration and better measurement stability than existing methods.
The survivability is one of the important issues in Resilient Packet Ring (RPR) networks. This article analyzes a new failure scenario and put forward a new restoration mechanism named as C-steering. The mathematical model has been established to investigate the survivability of the RPR network in three operation methods. The throughput-delay performance and link utilization are discussed theoretically and experimentally.
This paper reports the progress of the 863 high-technology project of China "Optical Resilient Packet Ring (O-RPR) Based on All-optical Buffering Techniques". In this ring network, for the packet through an intermediate node the conversion of O/E/O is not needed in order to overcome the bottleneck of O/E/O. In all-optical node a Dual Loop Optical Buffer (DLOB) is used to revolve the collision between the packet, which pass through the node, and add packet from local user to ring. The principle of DLOB is introduced. The bit-rate of head of optical frame is lower than the bit-rate of payload in a packet, in order to increase the efficiency of transmission link. This paper will introduce the network topology, layers and the structure of optical node. It includes an optical splitter, optical delay line as input buffer, a SOA as optical switch, which switch the packet dropping down form the ring or pass through the node, a DLOB and an electric buffer. An ARM is used for regulation of different buffers. The experiment results of a demonstrate network including 3 nodes are given.
This article has put forward a new optical fiber strain sensor, based on the spiral bending loss of single mode fiber. It uses the theory of backward Rayleigh scatter and anlong with OTDR composes of distributed fiber optic sensing system so as to realize the measurement at a certain precision. The paper has also proceeded the theory analysis and experimental investigation on the optical fiber sensing system, and has proved its good sensing characteristics.