4 results about "Star coupler" patented technology

The present application relates to an array waveguide grating. The array waveguide grating comprises an input coupler, a waveguide array and an output coupler, wherein the waveguide array is coupled between the input coupler and the output coupler, and the waveguide array comprises a plurality of waveguides; the input coupler is used for allocating received optical signals to the plurality of waveguides, and the waveguides are used for guiding the allocated optical signals; and the output coupler is used for coupling the optical signals, which are transmitted on the plurality of waveguides. The input coupler has a first refractive index, each waveguide has a second refractive index, and the output coupler has a third refractive index, wherein the first refractive index and the third refractive index are both greater than the second refractive index. The array waveguide grating can solve both the problem of an insertion loss of a star coupler being relatively high and the problem of a phase error being relatively large due to the roughness of a side wall of a waveguide, and insertion loss of the array waveguide grating is relatively low.

The invention provides a receiving and transmitting integrated optical phased array chip based on grating lobe demodulation, which relates to the technical field of photon integrated circuits and comprises an optical input end, a multimode interference beam splitter, a transmitting phase shifter array, a transmitting grating antenna array, a receiving grating antenna array, a receiving phase shifter array, an equal-length waveguide array, a star coupler and a receiving channel. Wherein the multimode interference beam splitter, the star coupler, the transmitting and receiving phase shifter array, the pair of coaxial receiving and transmitting grating antenna arrays with mismatched array spacing and the equilong array waveguides form a deep coupling and indispensable collaborative design chip structure, so that a parallel transmitting and receiving function based on grating lobe demodulation is realized. According to the receiving and transmitting integrated optical phased array chip based on grating lobe demodulation, the main lobe and the grating lobe are demodulated to different channels, the problem that a traditional OPA cannot utilize grating lobe energy is solved, parallel receiving and transmitting distance measurement based on grating lobe demodulation is achieved, the control complexity is reduced, and the light energy utilization efficiency is improved.

Multi-directional optical devices are disclosed. The optical device may employ a multiple input / multiple output optical coupling structure to determine propagation direction of received light (in receiver configuration), and / or control the propagation direction of transmitted light (in transmitter configuration). Propagation direction can be determined without the need for moving parts. In accordance with some embodiments, designs of solid-state photonic integrated circuits (PICs) are disclosed herein that utilize N×M star couplers to perform Fourier transformations to light traversing between the N ports and M ports such that light arriving at one or more of the N ports is distributed with a linear phase profile across the M ports. The slope of the linear phase profile is dependent on which of the N ports that light was received from. The light exits from waveguides coupled to the M ports at one or more propagation directions dependent on the linear phase profile.

This invention proposes an integrated optical phased array chip based on grating lobe demodulation, belonging to the field of photonic integrated circuit technology. It includes: an optical input terminal, a multimode interferometric beamsplitter, a transmit phase shifter array, a transmit grating antenna array, a receive grating antenna array, a receive phase shifter array, an equal-length waveguide array, a star coupler, and a receive channel. The multimode interferometric beamsplitter, star coupler, transmit and receive phase shifter arrays, a pair of coaxial arrays with mismatched transmit and receive grating antenna arrays, and equal-length waveguide arrays constitute a deeply coupled and indispensable collaboratively designed chip structure, realizing parallel transceiver functionality based on grating lobe demodulation. The proposed integrated optical phased array chip based on grating lobe demodulation demodulates the main lobe and grating lobes to different channels, solving the problem that traditional OPAs cannot utilize grating lobe energy, realizing parallel transceiver ranging based on grating lobe demodulation, reducing control complexity, and improving optical energy utilization efficiency.