Optical isolator with high bandwidth isolation and low insertion loss

• Main Authors: WU SHUYU, XU YUNBING, LIN DONG
• Format: Patent
• Language: Chinese; English
• Published: 16.08.2022
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

An input optical fiber collimator, a two-stage optical isolator core and an output optical fiber collimator are sequentially arranged along the direction of an optical path, and small platforms are respectively cast at acute angle ends of wedge angle surfaces of lenses and optical fiber heads of the input optical fiber collimator and the output optical fiber collimator; the Faraday optical rotation crystals adopted by the first-stage optical isolation assembly and the second-stage optical isolation assembly are different in wavelength, and the birefringent wedge angle pieces adopted by the first-stage optical isolation assembly and the second-stage optical isolation assembly are different in wedge angle. The optical axis of the birefringent wedge angle sheet at the emergent end of the first-stage optical isolation assembly is perpendicular to the optical axis of the birefringent wedge angle sheet at the incident end of the second-stage optical isolation assembly. The isolation performance in the bandwidth can