A Large-Capacity Micro-Cavity Array Fiber With Randomly Distributed Characteristic Parameters

This paper proposes a large-capacity micro-cavity array (MCA) fiber structure with randomly distributed characteristic parameters, which improves the reuse capacity of the entire micro-cavity array. The effect of multiple reflections on the signal-to-noise ratio of the system can reduce by random grating spacing in the micro-cavity array. Thereby increasing the reuse capacity of the entire micro-cavity array. The feasibility of the method is verified by simulating the signal-to-noise ratio and multiple reflection power of the micro-cavity unit under different random intervals. The three random intervals of 10%, 20%, and 30% are simulated. The power of the input grating optical is 0 dB At the lowest signal-to-noise ratio of 12 dB, the multiplexing capacity of the three randomly spaced fiber Bragg grating (FBG) micro-cavity arrays has been increased by 1112, 1094, and 1111, which is more than 10% higher than that of the equally spaced micro-cavity array fibers. The micro-cavity array fiber proposed in this paper is composed of the ultrashort weak grating. A micro-cavity (MC) is constructed between two adjacent gratings to form a fully distributed micro-cavity array, which has the characteristics of full distribution and high precision. Increasing the multiplexing capacity of micro-cavity arrays can apply to large range, long distance and high spatial resolution structural state monitoring better.