Optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing

Abstract

The invention discloses an optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing. The signal light is input into a connecting waveguide through a tunable laser; a TE mode or a TM mode is selected through a polarization selection switch, and then a cascaded optical splitter is input through the connecting waveguide to enable optical power to be divided equally; then the light is input to a phase modulation array through the connecting waveguide; phase modulation can be carried out on a waveguide array element by adopting an external circuit application voltage; an optical field with different phases is input into an output coupling grating array of one-dimensional arrangement through an output connecting waveguide to be transmitted, and the two-dimensional scanning of the emergent wave beam is realized; the light field with an inclined near field phase surface is subjected to beam deflection in a far field coherent superposition mode in one dimensionality, so that the dynamic scanning of the light beam can be controlled through external voltage regulation; and the light beam scanning of the other dimensionality is realized by changing thewavelength of the input light through the tunable laser. The laser radar scanning chip has the advantages of low cost, high stability, easiness in single-chip photoelectric integration and the like, and is beneficial to realizing the laser radar controlled by all-solid-state light beams.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, in particular to an optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing. Background technique [0002] Optical Phased Array (Optical Phased Array, OPA) is an array composed of coherent optical transmitter units, analogous to the well-known phased array antenna concept in radio wave and microwave technology. By controlling the phase and / or amplitude of these emitters, it is possible to fully control the electromagnetic field in the vicinity of the emitters, known as the near field. Optical phased arrays can be integrated on a chip with small size and low power consumption. On-chip integrated optics in particular offer low-cost technology that can be integrated with CMOS electronics and lasers. [0003] Integrated optical phased arrays have been extensively studied due to their solid-state beam-steering capabilities and hold promise in areas such...

AI Technical Summary

Problems solved by technology

[0004] Current optical phased arrays, despite increasing array size and element count, are still limited in beam quality and steering angle

In order to realize the angular scanning of the optical phased array in two-dimensional space, there are currently two methods: one is to directly design the optical phased array arranged in a two-dimensional array, but due to size limitations, it is currently impossible to achieve a large scanning angle; the second is to Realization of two-dimensional optical phased array scanning by using one-dimensional grating array plus wavelength scanning

However, the angles of the reported methods are all limited by various conditions.

Images