Transmitting fiber grating sensing signal to remote monitoring center by existing GPON communication network can avoid laying large-scale special sensing nets

reduce cost

and form network flexibly.In order to merge multiple optical fiber grating sensing nets with GPON

design of access node between sensing subnets and GPON is one of the key problems.Access node accesses sensing subnets signal by adopting TDMA technology

and data of subnets are assembled into multiplexed sensing frame.Design of the frame structure reduces the bit number of control overhead of the load of the GEM frame

saves time for remote monitoring center to extract useful sensing information and makes optical fiber grating sensor signals transmit effectively in high-speed communications network.