Three-port optical circulator

Abstract

The invention relates to the field of optics, and provides a three-port optical circulator. The three-port optical circulator comprises a dual-fiber collimator, a ridge prism, a first light splitting crystal, a first half-wave plate assembly, a second light splitting crystal, a second half-wave plate assembly, an optical rotation crystal, a third light splitting crystal and a single-fiber collimator, which are all disposed in sequence in an optical path direction. A magnet ring sleeves the periphery of the optical rotation crystal. The first half-wave plate assembly comprises a first half-wave plate and a second half-wave plate, which are disposed in the first quadrant and in the third quadrant, perpendicular to the optical path direction, of a two-dimensional rectangular coordinate system respectively. The optical axis of the first half-wave plate and the optical axis of the second half-wave plate are parallel to each other, and each optical axis is at an angle of 45 degrees to a horizontal plane. The second half-wave plate assembly comprises a third half-wave plate and a fourth half-wave plate, which are arranged side by side on a plane perpendicular to the optical path direction. Compared with a conventional three-port optical circulator, the three-port optical circulator of the invention has the advantages that only one optical rotation crystal is adopted, people do not need to arrange multiple stacked magnetic fields for an optical rotation crystal occasion that can only adopt a nonsaturated magnetic field, and the circulator is compactor in structure, small in size and low in cost.

Description

technical field [0001] The invention belongs to the field of fiber laser systems and detection systems, in particular to a three-port optical circulator. Background technique [0002] An optical circulator is a multi-port non-reciprocal optical device. Optical signals can only be transmitted sequentially along a specific port in the device, that is, when an optical signal is input from a specified port, it can only be transmitted from another specific port. If the output is not transmitted according to the specified port sequence, the loss of the optical signal of the device will be very large, which plays the role of isolating the optical signal. Optical circulators are widely used in laser systems, coherent detection, and hydrophones. Two optically active crystals are used in existing optical circulators. For optically active crystals that use unsaturated magnetic fields, the superposition of multiple magnetic fields is required. , so the volume is huge, and its cost is c...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a three-port optical circulator, aiming to solve the problem of large volume due to the need for multiple magnetic field superposition due to the use of two optically active crystals

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