Optical phased array radiator
a phased array and radiator technology, applied in non-linear optics, instruments, wave based measurement systems, etc., can solve the problems of phase non-uniformity of laser light, instability of laser light, and inability to expect uniform temperature variation in the entire region of the grating radiator array according to the related ar
Pending Publication Date: 2022-08-04
HYUNDAI MOTOR CO LTD +2
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Benefits of technology
The present patent is about an optical device that can efficiently move a beam of light in a vertical direction using an optical phased array (OPA). The technical effect of this device is to create an efficient and precise way to control the movement of light beams.
Problems solved by technology
The resistor arrangement according to the related art cannot expect a uniform temperature variation in the entire region of the grating radiator array.
That is, due to a physical structure of the intrinsic silicon region (i region) and non-uniform resistance, a non-uniform temperature distribution occurs to cause phase non-uniformity of laser light.
Thus, as shown in FIG. 4, instability of the laser light may occur.
However, as the overall width of the grating radiator array is increased, a probability of occurrence of an unbalance in resistance is further increased due to a process error and the like.
When a higher voltage is applied to heat the grating radiator array, non-uniformity in temperature occurs due to an imbalance in resistance and thus an effective refractive index of each portion is varied.
Thus, since local heating due to an imbalance of resistance affects durability of the grating radiator array, damage may occur in a grating radiator.
Method used
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[0040]It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
[0041]The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a,”“an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It wil...
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Abstract
An optical phased array (OPA) radiator includes a plurality of unit radiators configured to serve as optical waveguides, each of the unit radiators being made of a silicon material and each having a predetermined length, where the unit radiators are disposed in parallel; a cladding portion configured to cover the plurality of unit radiators; and a plurality of electrodes arranged in parallel with the plurality of unit radiators on the cladding portion, where the plurality of electrodes are arranged so as not to overlap the plurality of unit radiators in a vertical direction. A beam radiated through the unit radiators using a phased array can be efficiently vertically steered.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)[0001]This application claims under 35 U.S.C. § 119(a) the benefit of Korean Patent Application No. 10-2021-0015562, filed on Feb. 3, 2021, the entire contents of which are incorporated herein by reference.BACKGROUND(a) Technical Field[0002]The present disclosure relates to an optical phased array (OPA) radiator using a thermo-optical effect based on optical phased arrays.(b) Description of the Related Art[0003]In order to detect a location or shape of an object at a long distance, a radio detection and ranging (RADAR) technique using electromagnetic waves has been used in various fields for a long period of time. Recently, by developing such a detection technique, a more precise, faster, and miniaturized light detection and ranging (LiDAR) technique has been developed. The LiDAR technique using light is regarded as a core technique of next-generation major industry fields such as an autonomous vehicle field, a wireless optical communication ...
Claims
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IPC IPC(8): G02F1/295
CPCG02F1/2955G02F1/292G01S7/481
Inventor KANG, CHAN-HEERHEE, HYUN-WOOYOON, HYEON-HOKWON, NAM-HYUNPARK, HYO-HOONKANG, GEUM-BONG
Owner HYUNDAI MOTOR CO LTD