Single-polarization transmission type photonic crystal fiber resonant cavity

Abstract

The invention discloses a single-polarization transmission type photonic crystal fiber resonant cavity comprising a first optical fiber collimator, a second optical fiber collimator, a first photonic crystal fiber collimator, a second photonic crystal fiber collimator, a double-refraction optical beam splitter, and a fixation device. According to the invention, when a resonant cavity is built, a birefringent crystal is used for manufacturing the optical beam splitter and o light and e light in incident light are separated, so that the polarization extinction ratio of the resonant cavity is increased and thus the application potential of the photonic crystal fiber resonant cavity in a gyroscopic system can be improved substantially. On the basis of the polarizing design inside the cavity, the requirement on the alignment precision of the polarization axis of the fiber is low and thus the process difficulty of the resonance cavity is reduced substantially. A transmission resonant cavity structure is realized only by using one beam splitter, so that the total losses inside the cavity can be reduced effectively and the definition of the resonant cavity is enhanced. Meanwhile, the overall size of the resonant cavity can be reduced and miniaturization of the gyroscopic system can be realized.

Description

technical field [0001] The invention relates to a single-polarization transmission photonic crystal fiber resonant cavity, which belongs to the technical field of light interference and optical sensing. Background technique [0002] Optical resonators are research hotspots in the fields of lasers, optical sensing, and inertia. One of the key indicators is clarity or quality factor, which often determines the performance of the entire system. In the resonant optical gyroscope, the definition of the passive resonant cavity determines the limit sensitivity of the gyro, and the non-reciprocal error of the transmissive resonant cavity is smaller than that of the reflective resonant cavity. Therefore, the high-definition transmissive resonant cavity is developed The key to high-precision resonant optical gyroscope. [0003] Photonic crystal fibers have many excellent properties, but they are quite different from traditional optical fibers. Developing high-performance photonic cry...

AI Technical Summary

Problems solved by technology

Due to the large polarization crosstalk transmitted by photonic crystal fiber, the overall polarization extinction ratio of the existing photonic crystal fiber resonator is poor, which will introduce a huge polarization noise, which limits the further improvement of gyroscope performance

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