Polarization-independent lithium niobate optical isolator

Abstract

The invention provides a polarization-independent lithium niobate optical isolator, which comprises a first interference arm (1), a second interference arm (2), a first coupler (3) and a second coupler (4) which are integrally formed; the first coupler (3) and the second coupler (4) are formed at the two ends of the first interference arm (1) and the two ends of the second interference arm (2) respectively. Each of the first interference arm (1) and the second interference arm (2) at least comprises a reciprocal waveguide and a non-reciprocal waveguide along the length direction, and the reciprocal waveguide of the first interference arm (1) and the reciprocal waveguide of the second interference arm (2) are different in length; the nonreciprocal waveguide comprises a magneto-optical waveguide and a lithium niobate ridge waveguide, the magneto-optical waveguide is located above the planar waveguide of the lithium niobate ridge waveguide, and the magneto-optical waveguide and the ridge of the lithium niobate ridge waveguide are formed side by side in the width direction; the first coupler (3) and the second coupler (4) are lithium niobate ridge waveguides, so that reverse input light of a transverse mode and reverse input light of a longitudinal mode are isolated at the same time. The polarization-independent lithium niobate optical isolator has the characteristics of polarization independence, high waveguide coupling efficiency, easiness in integration and the like.

Description

technical field [0001] The invention relates to the technical field of micro-nano optoelectronics integration, in particular to a lithium niobate optical isolator which has nothing to do with polarization. Background technique [0002] With the development of the information age, in order to better meet its "explosive growth" information transmission needs, the performance requirements for optical fiber communication modules, links and systems are gradually increasing. In the optical path, due to various reasons, the reflected light opposite to the direction of the forward transmission light will be generated. For example, when the light is coupled into the optical fiber, due to the existence of connectors and fusion points, there will be reflections at these end faces and points that are different from the original transmission direction. Opposite reflected light. When the photons of the reflected wave return to the device, they have a secondary interaction with the semico...

AI Technical Summary

Problems solved by technology

However, due to the lack of an effective and practical integration method for optical isolators, the integration of complex active devices on photonic integrated chips has also been hindered.

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