The invention discloses a hollow-core
photonic crystal fiber resonant
gyroscope based on free-form surface lens
coupling. In the present invention, the light emitted by the narrow-linewidth
laser light source passes through the first polarization-maintaining
optical fiber and then modulated by the phase modulator to reach the Y
waveguide. The Y
waveguide divides the light into two beams of light with equal
light intensity. After the
circulator exits from the corresponding second polarization-maintaining
fiber, it passes through the free-form surface lens coupler and the polarization
beam splitting prism to couple and then enters the hollow-core
fiber ring; a part of the light in the hollow-core
fiber ring is reflected by the free-form surface lens coupler in the
Resonance occurs in the ring of the hollow-core
fiber ring, and another part of the light in the hollow-core
fiber ring passes through the free-form surface lens coupler and then returns to the second polarization-maintaining fiber, passes through the corresponding
circulator, and then reaches the corresponding
photodetector. The invention has high integration, fewer
coupling parts, reduces relative
position error between components, has a more compact overall structure, improves the reliability and environmental adaptability of the fiber optic
gyroscope, and has simple manufacturing process and high stability.