All-Passive Optical Fiber Sensor Network With Self-Healing Functionality

Abstract

An all-passive optical fiber sensor network is proposed based on a novel singleline bidirectional optical add-drop multiplexer (SBOADM). By reasonably employing fiber Bragg gratings and optical circulators to compose the self-developed SBOADM, single-line bidirectional transmission can be easily achieved by the SBOADM without the assistance of a power supply or optical switch. Experimental results prove that when optical signals are fed into the proposed SBOADM in clockwise or counterclockwise direction, the insertion loss of the dropped optical signals is roughly 3.7 dB or 4.5 dB, respectively, and the attenuation of each added signal is about 3.6 dB. When the SBOADM is employed to bridge a hybrid tree-based and ring-based optical fiber sensor network, self-healing functionality can be easily embedded into the network. Once an interruption occurs in the network, the only thing that the system maintainer needs to do is to adjust one optical switch pre-installed in the remote node of the sensor network. Simulation results show that the maximum power penalty caused by the self-healing function is roughly 6 dB. That is to say, the proposal can easily overcome any one fiber-link failure without adjusting the network deploying setting or employing complex control management.

Fiber Link Health Detection and Self-Healing Algorithm for Two-Ring-Based RoF Transport Systems

“…To drop dedicated RoF signals into the connected RoF groups in both CW and CCW directions, the SBOADM published in [13] was modified as shown in Figure 2. A 2*2 SW and optical switch trigger (OST) were inserted into each SBOADM to bridge the two add/drop ports with the connected RoF group.…”

“…To address these bottlenecks, a novel SBOADM was proposed in our previous research [13] for building a large-scale optical fiber sensor network. Based on two FBGs, two three-port OCs, and three four-port OCs, the novel SBOADM can drop dedicated light waves from the fiber ring regardless of whether the light waves are transmitted in either the CW or CCW direction of the ring and can add and route upstream light waves back to the CO along the reverse transmission direction of the downstream light waves.…”

Self-Healing and Shortest Path in Optical Fiber Sensor Network

“…Chang et al devised a fully passive OFSN based on a single-line bidirectional optical addition multiplexer (SBOADM), which can easily accomplish single-line bidirectional transmission without a power supply or optical switch; once the network fails, the preinstalled remote node of the sensor network must be adjusted. [11] Zhu et al proposed a real-time parallel data acquisition and big data processing method that can reuse different optical fiber sensors with a sampling frequency of up to 6.4 MHz, and data throughput of up to 13.8 MB/s; this method was three times faster than the general method [12]. In 2020, Manie et al proposed a deep learning algorithm that improves the measurement accuracy of sensor signals for sensor systems.…”

Single-Line Bidirectional Optical Add/Drop Multiplexer for Ring Topology Optical Fiber Networks

“…However, building ROADM in the access network is not suitable due to its high cost and complex structure [ 15 , 16 ]. Several types of single-line bidirectional add/drop multiplexers (SBOADMs) [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], which can operate bidirectional transmissions on a single fiber loop, are later developed. The overall network construction cost can be reduced by removing the spare optical fiber loop.…”