Optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection

Abstract

The invention discloses an optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection. According to the optical fiber ring eigen frequency measurement device and method, modulation is applied to by adopting a sine wave, and a second harmonic amplitude in an output signal is interfered through detecting an optical fiber ring, thus an eigen frequency is measured. The optical fiber ring eigen frequency measurement device has the technical effect that the modulation is applied by using the sine wave instead of a square wave, multiple defects caused by modulation of the square wave are overcome, the amplitude of the second harmonic of the output signal is detected, and high signal to noise ratio can be obtained by adopting a correlation detection technology.

Description

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AI Technical Summary

Benefits of technology

This patented technology uses sinusoidal signals rather than rectangular ones because they are easier to measure with less expensive components compared to other methods like quadrature phase shift keying. By applying different types of modulations on both sides of each carrier pair, it becomes more accurate at determining its duty cycles or pulses within certain limits without increasing their complexity. Additionally, this method allows for precise measurements when changing frequencies between two carriers, further improving upon existing techniques such as time division multiplexed systems. Overall, these technical improvements make better quality control processes possible during production.

Problems solved by technology

This patented technical problem addressed by this patents relates to accurately determining the phase difference between two different signals (light) transmitted within a looped fiberglass optic sensor system with circular polarization rotation.

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