Four-port polarization dependent optical circulator

Abstract

The invention provides a four-port polarization dependent optical circulator. The optical circulator comprises a first double-tail fiber collimator, a first polarization beam splitting element, a magnetic rotation element, a second polarization beam splitting element and a second double-tail fiber collimator which are sequentially arranged in the light path direction. In projection in the light path direction, a first polarization maintaining optical fiber and a second polarization maintaining optical fiber are connected to form a first fiber core connection line; the third polarization maintaining optical fiber and the fourth polarization maintaining optical fiber are connected to form a second fiber core connecting line, a preset included angle is formed between the first fiber core connecting line and the second fiber core connecting line; in projection in the light path direction, a preset included angle is formed between the optical axis of the first polarization splitting elementand the optical axis of the second polarization splitting element. According to the scheme, a wave plate is omitted, the cost is greatly saved, the size of the whole optical circulator is smaller, and due to the fact that the double-tail collimator is used and optical fiber ports are evenly distributed on the two sides, the structure is simple, the occupied space is small, and fiber coiling is easier.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a four-port polarization-dependent optical circulator. Background technique [0002] Optical circulators are widely used in the field of fiber lasers or fiber optic sensors, while traditional polarization-dependent optical circulators generally use PBS cubes to change the optical path such as figure 1 , not only is it expensive and bulky, but also needs to use multiple PBS cubes, and also uses wave plates for optical rotation, which does not take advantage of cost control, and has a complex structure. The four ports must be separated independently, resulting in a large volume occupied by the package. , and the separation of the outlet direction of the port is also not conducive to the placement of the device. Contents of the invention [0003] The object of the present invention is to provide a polarization-dependent optical circulator with lower cost, simple structure and optim...

AI Technical Summary

Problems solved by technology

[0002] Optical circulators are widely used in the field of fiber lasers or fiber optic sensors, while traditional polarization-dependent optical circulators generally use PBS cubes to change the optical path such as figure 1 , not only is it expensive and bulky, but also needs to use multiple PBS cubes, and also uses wave plates for optical rotation, which does not take advantage of cost control, and has a complex structure. The four ports must be separated independently, resulting in a large volume occupied by the package. , and the separation of the outlet direction of the port is also not conducive to the placement of the device

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