Figure 1.Schematic diagram of the proposed http://www.selleckchem.com/products/Temsirolimus.html fiber sensor system. [central office (CO), remote node (RN), optical switch (SW), sensor (S)].Each remote node has three 2 �� 2 optical switches (Figure 2). Bus subnets are attached to ring subnets via remote nodes. The remote node in each bus subnet can be controlled by the time-division Inhibitors,Modulators,Libraries multiplexing signal to enhance sensor network capacity.Figure 2.Schematic diagram of a remote node.For instance, the dashed line in Figures 3(a�Cd) indicates schematically the situation when sensing regions A, B, C and D are selected, respectively, using the time-division multiplexing signal. Because this bus topology is combined with the time-division multiplexing technology, the proposed system supports a large number of sensors.

Moreover, for such a large sensor network, this work applies the reconfigurable function for the sensor network by controlling remote nodes and optical switches. Such an architecture offers a survival function under link failure by reconfiguring the sensor network. Figure Inhibitors,Modulators,Libraries 4 shows schematically a situation in which a fiber link in the ring subnets fails. In this case, the sensing signals Inhibitors,Modulators,Libraries from sensing Region 8 are lost. However, remote nodes 1 and 8 (RN1 and RN8) can be modified to retransmit sensing signals in sensing Region 8. If the corresponding link in the upper-level star subnet is broken, the control circuit reconfigures the remote node function (Figure 5) such that the network can be modified to retransmit the sensing signals.Figure 3.

Schematic of the situations (indicated by the dashed line) Inhibitors,Modulators,Libraries (a) when sensing Region A is selected by the time-division multiplexing signal, (b) when sensing Region B is selected by the time-division multiplexing signal, (c) when sensing Region C is selected …Figure 4.Schematic diagram breakpoints in the ring subnet.Figure 5.Schematic diagram of breakpoints in the star subnet.Figure 6 shows schematically a situation in which a fiber link fails in the bus subnet and the ring subnet. In this case, the sensing signals from sensing Region 5 are lost. Nevertheless, remote nodes 3 and 5 (RN3 and RN5) can be modified to retransmit sensing signals in sensing Region 5, as shown in Figure 6. Moreover the reconfigurable function can be improved by increasing the number of remote nodes and optical switches (Figure 7).Figure 6.Schematic Brefeldin_A diagram of breakpoints in the bus and ring subnets.Figure 7.Schematic diagram of proposed sensor network.3.?Experimental example ResultsFigure 8 shows the experimental setup for the proposed FBG sensor system. This work examined two subnets in the star-ring-bus architecture. The central office (CO) in this system has a tunable bandpass filter (TF), erbium-doped fiber amplifier (EDFA), optical circulator (OC) and optical coupler (C).