Novel fiber optical rotary joint based on photonic crystal

Abstract

The invention discloses a novel fiber optical rotary joint based on photonic crystal. The novel fiber optical rotary joint comprises an incidence end, a photonic crystal with composite defects and a receiving end. The incidence end comprises paraxial rotary incidence light, and forms a rotor of the fiber optical rotary joint. The photonic crystal with the composite defects comprises a photonic crystal substrate, a composite annular defect, a point defect, a linear defect and a cycle dielectric cylinder array with a 45-degree inclined angle, wherein a dielectric cylinder is arranged on the outer side of the composite annular defect, and the distance between the dielectric cylinder and the composite annular defect is equal to the cycle of the photonic crystal substrate formed by dielectrics arranged in a cycle mode so that perpendicular incidence light is bent for 90 degrees, and transmission of optical signals in the composite annular defect is achieved. The receiving end comprises output optical signals, and forms a stator of the fiber optical rotary joint. The structure is expanded to obtain the novel multi-channel fiber optical rotary joint. The novel fiber optical rotary joint is low in loss of optical signal transmission, strong in magnetic interference resisting capacity, and capable of achieving continuous input and fixed output of dynamic annular optical signals.

Description

technical field [0001] The invention relates to the technical field of optical signal transmission in optical fiber communication, in particular to a novel optical fiber rotary connector based on photonic crystals. Background technique [0002] Optical fiber rotary connector, as a kind of optical fiber communication device that realizes the transmission requirements of rotating optical signals between different signal platforms, is widely used in different technical fields, such as marine exploration and scanning systems, aerospace vehicles, industrial manipulators and oil exploration platforms, etc. For swivel connections. The application of signal rotation transmission in the military field is particularly prominent. The omnidirectional target scanning system, radar system, night vision system and other systems on the naval, land and air armaments all need related rotating signal transmission devices. [0003] Conventional optical fiber rotary connectors mainly rely on tr...

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Problems solved by technology

[0005] Chinese patent ZL201010103099.X discloses a hollow optical fiber rotary connector, but it is difficult to manufacture the radiation blazed grating used, and it is difficult to realize the overall device. At the same time, due to the multiple reflections of the optical signal inside the waveguide, the signal transmission efficiency is reduced. decline

[0006] In summary, although the relevant hollow-state optical fiber rotary connectors at home and abroad have realized the transmission of "hollow-state" optical signals in function, they all have relatively large transmission losses.

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