Dual-channel edge characteristic analysis of all-fiber structure based on micro-ring resonator in wavelength demodulation system

We present an all-fiber dual-channel edge demodulation structure consisting of a micro-ring resonator and an asymmetric M–Z interferometer. In order to achieve dual-channel edge detection, the characteristics of the wavelength demodulation system of fiber Bragg grating need to be analyzed. The transmission curve is theoretically studied and simulated by the Jones matrix method. Our simulation results show that the prerequisite for dual-channel wavelength demodulation is δ=0.5Δϕ. When the micro-ring is lossless, the demodulation precision increases with the decrease of K, but the wavelength range becomes narrow; The output characteristics satisfy the mathematical expression [Formula presented]. Furthermore, the influence of different α on the transmission spectrum is also dissimilar. By adjusting various parameters, the discrepancy between the wavelength demodulation range and accuracy of the two ports was explored in detail.