Wireless optical charging system and charging method thereof

Abstract

The wireless optical charging system of the present invention comprises: a transmission unit for transmitting a laser beam as light with increased energy through resonance; and a receiving unit for receiving the light transmitted from the transmission unit and converting a part of the energy of the received light into electric energy to charge the device. The present invention has the effect of being able to solve the distance limitation and the harmfulness to the human body by using the laser resonance power transmission technology.

Description

Technical Field

[0001] The present invention relates to a wireless optical charging system and a charging method thereof, and more particularly, to the following wireless optical charging system and a charging method thereof: if the wavelengths of a light source beam in space are divided, and retro-reflectors serving as receiving parts are randomly arranged in two-dimensional light, only wavelengths with consistent light paths will resonate and transmit optical power. Background Art

[0002] The magnetic induction method is the most commercialized wireless charging technology at present. It is a short-distance charging method that requires close contact with the charger within 1 cm to charge. The magnetic resonance method proposed to compensate for this method uses the resonant frequency to transfer magnetism to the same frequency, so charging can be performed even if you are not close. It also has the advantage that charging will not be interfered by other objects in the middle. However, there is a problem that the efficiency will drop sharply if the distance from the charger exceeds 1m.

[0003] As another method, the problem with the radio frequency (RF) electromagnetic wave wireless charging method is that its application field is limited due to the harmfulness of electromagnetic waves.

[0004] In order to charge multiple fixed and mobile devices at long distances and at the same time in a limited space, a new technology other than the currently developed methods is required. Summary of the invention

[0005] In view of the problems and actual conditions as described above, the purpose of the present invention is to provide a wireless optical charging system and a charging method thereof as follows: unlike the magnetic induction and radio frequency technology proximity methods, by using infrared light and laser resonance technology to develop a long-range optical wireless charging technology that is harmless to the human body, it is completely free from the traditional way of electrical power supply and can completely solve the battery charging problem of mobile devices (e.g., consumer electronics, drones).

[0006] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that it includes: a transmission unit, which transmits a wireless optical charging light source beam as energy-increased light through resonance; and a receiving unit, which is used to receive the light transmitted from the above-mentioned transmission unit and convert a part of the energy of the received light into electrical energy to charge the device.

[0007] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit includes: a light source part; a diffraction grating, a prism or an arrayed waveguide grating (arrayed waveguide grating), which is used to divide the light received from the above-mentioned light source part into wavelengths in a specified range and output them to space; and a collimator, which is arranged between the above-mentioned light source part and the above-mentioned diffraction grating, and is used to convert the light output from the above-mentioned light source part into parallel light.

[0008] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit further includes a direction control unit, and the direction control unit controls the direction of the diffraction grating by receiving output information of the light output from the light source unit. The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit further includes a direction conversion unit, and the direction conversion unit is arranged at the output end of the diffraction grating, and the direction of the light output from the diffraction grating is converted by being controlled by the direction control unit instead of the diffraction grating.

[0009] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit includes: a light source part; a width expansion part, which is used to expand the width of the light output from the above-mentioned light source part before it is input into the above-mentioned diffraction grating to increase the reflectivity of the light incident on the retroreflector (retroreflector) of the receiver; a diffraction grating, which is used to divide the light received from the above-mentioned width expansion part into a prescribed range of wavelengths for output to space; and a telephoto part, which is formed at the output end of the above-mentioned diffraction grating and is used to expand the field of view (FOV: field of view).

[0010] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the telescope unit includes a plurality of telescope units, and a part of the plurality of telescope units is arranged in parallel. The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the light source unit includes: a polarization-maintaining optical fiber for maintaining the polarization of light; a semiconductor optical amplifier formed on the path of the polarization-maintaining optical fiber for providing a broadband gain spectrum with signal gain for the light; an isolator for allowing light to be transmitted only along one side; and a coupler for receiving power from the collimator and outputting a broadband light source from the semiconductor optical amplifier to the diffraction grating.

[0011] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the light source portion includes: a single-mode optical fiber having a propagation mode of light; a semiconductor optical amplifier formed on the path of the above-mentioned single-mode optical fiber and used to provide a broadband gain spectrum with signal gain for the above-mentioned light; an isolator that only allows light to be transmitted along one side; a polarization control portion formed at the input and output ends of the above-mentioned semiconductor optical amplifier and used to maintain the polarization of light; and a coupler that receives power from the above-mentioned collimator and outputs a broadband light source from the above-mentioned semiconductor optical amplifier to the above-mentioned diffraction grating.

[0012] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the light source portion includes: a single-mode optical fiber having a propagation mode of light; a fiber laser formed on the path of the above-mentioned single-mode optical fiber and capable of adjusting the output so as to output the above-mentioned light in a broadband manner; a laser pump for adding light from an external light source to the above-mentioned single-mode optical fiber; an optical wavelength combiner for combining the wavelengths of the light added by the above-mentioned laser pump and the light of the above-mentioned single-mode optical fiber; an isolator for allowing light to be transmitted only in one direction; a polarization control portion formed at the input end and the output end of the above-mentioned fiber laser and for maintaining the polarization of light; and a coupler for receiving power from the above-mentioned collimator and outputting a broadband light source from the above-mentioned fiber laser to the above-mentioned diffraction grating.

[0013] The wireless optical charging system of the present invention for achieving the above object is characterized in that the light source unit includes an optical bandpass filter, and the optical bandpass filter increases the optical signal to noise ratio (OSNR) of the incident light signal by filtering the light incident to the light source unit.

[0014] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit also includes a spectrometer, which is arranged at the output end of the above-mentioned light source part, and is used to split the light incident from the above-mentioned light source part into two and transmit it to the above-mentioned direction control part and the above-mentioned diffraction grating, and the above-mentioned light source part includes: a plurality of direction conversion mirrors, which form a moving path of the light by converting the moving direction of the light; a semiconductor optical amplifier, which is formed on the above-mentioned moving path, and is used to provide a broadband gain spectrum with signal gain for the above-mentioned light; an isolator, which is used to allow the light to be transmitted only along one side direction of the above-mentioned moving path; and a collimator, which is arranged between the above-mentioned semiconductor optical amplifier and the isolator (Isolator), and is used to convert the light output from the above-mentioned semiconductor optical amplifier into parallel light.

[0015] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the light source portion includes: a single-mode optical fiber having a propagation mode of light; a semiconductor optical amplifier formed on the path of the above-mentioned single-mode optical fiber, for providing a broadband gain spectrum with signal gain for the above-mentioned light; a polarization control portion formed at the input and output ends of the above-mentioned semiconductor optical amplifier, for maintaining the polarization of light; and a circulator for guiding the light output from the output port of the above-mentioned semiconductor optical amplifier to a tap coupler before the light enters a collimator located in free space.

[0016] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the light source unit includes: a bidirectional optical fiber for performing bidirectional resonance; a coupler for outputting light moving in the above-mentioned bidirectional optical fiber at a specified ratio; a semiconductor optical amplifier formed at the output end of the above-mentioned coupler for providing a broadband gain spectrum with signal gain for the above-mentioned light; and a polarization control unit formed on the path of the above-mentioned bidirectional optical fiber and formed at the output end of the above-mentioned semiconductor optical amplifier for maintaining the polarization of the light.

[0017] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the light source portion includes: a reflector located in free space, which increases light energy by reflecting and resonating the incident light; a semiconductor optical amplifier, which is used to provide a broadband gain spectrum with signal gain for the light reflected from the above-mentioned reflector and incident on it; and a collimator, which is arranged between the above-mentioned reflector and the above-mentioned semiconductor optical amplifier, and is used to convert the output light into parallel light.

[0018] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that a plurality of the semiconductor optical amplifiers are connected in parallel, and couplers are respectively arranged at the input end nodes and output end nodes of the plurality of the semiconductor optical amplifiers. The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the width extension unit includes: a collimator for forming the light transmitted from the light source unit into parallel light rays; a polarization film for adjusting the polarization of the light formed into parallel light rays and twisted in space by the collimator 121; and a beam expander for expanding the width of the light polarized by the parallel light rays.

[0019] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the receiving unit includes: a retroreflector, which plays the role of reflecting the incident light at the same angle, arranged in a cubic form, and having a gap in the center; and an energy conversion part, which converts the light that is not reflected in the above-mentioned incident light and passes through the gap in the center into electrical energy by detecting the light.

[0020] The wireless optical charging system of the present invention for achieving the above object is characterized in that the receiving unit includes an optical bandpass filter, which increases the optical signal to noise ratio (OSNR) of the incident light signal by filtering the light incident to the receiving unit.

[0021] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the receiving unit includes: a substrate for reducing the reflectivity of light incident to the above-mentioned receiving unit; a spherical ball lens for resonating a portion of the wavelength of the light incident through the above-mentioned substrate; an optical diffuser for dispersing the light incident from the above-mentioned spherical ball lens by uniformly dividing the space; and a photovoltaic cell (PV cell) into which the converted electrical energy is charged.

[0022] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the receiving unit includes: an image sensor related to image acquisition; a spherical ball lens that resonates with a portion of the wavelength of the incident light; and a relay unit for selectively transmitting the light incident to the above-mentioned receiving unit to the above-mentioned image sensor or the above-mentioned ball lens.

[0023] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit includes: a light source part; a light transmitting mirror for transmitting the light received from the light source part to the receiving unit; and a collimator, which is arranged between the light source part and the light transmitting mirror and is used to convert the light output from the light source part into parallel light.

[0024] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the transmission unit also includes: a receiving unit detection module, used to detect the above-mentioned receiving unit to receive the light generated by the above-mentioned light source unit; and a direction control unit, used to control the direction of the above-mentioned light transmitting mirror.

[0025] The wireless optical charging system of the present invention for achieving the above-mentioned purpose is characterized in that the receiving unit detection module includes:

[0026] A shooting unit is used to shoot a space; a receiving unit detection unit detects the receiving unit using the LED light of the receiving unit 200 generated according to the drive in the image shot by the shooting unit; and a tracking signal generating unit is used to generate a tracking signal so that the light transmitting mirror is controlled by the direction control unit and transmits light by tracking the receiving unit detected by the receiving unit detection unit.

[0027] The wireless optical charging system of the present invention can apply laser resonance power transmission technology to divide the light source beam of the semiconductor and optical fiber amplifier into spatial wavelengths to transmit optical power to multiple remote receivers, thereby having the effect of being able to solve distance limitations and harmfulness to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 4 is a structural diagram of a wireless optical charging system according to an embodiment of the present invention.

[0029] Figure 2 FIG. 1 is a diagram showing a wireless optical charging system according to a first embodiment of the present invention.

[0030] Figure 3 FIG. 2 is a diagram showing a wireless optical charging system according to a second embodiment of the present invention.

[0031] Figure 4 FIG. 1 is a diagram showing a wireless optical charging system according to a third embodiment of the present invention.

[0032] Figure 5 FIG. 1 is a diagram showing a case where a plurality of semiconductor optical amplifier (SOA) light sources are used according to an embodiment of the present invention.

[0033] Figure 6 FIG. 1 is a diagram showing the structure of a deformable light source unit according to an embodiment of the present invention.

[0034] Figure 7 FIG. 1 is a diagram showing a case where a fiber laser is included in a light source unit according to an embodiment of the present invention.

[0035] Figure 8 FIG. 1 is a diagram showing a case where a light source unit is configured as a vertical cavity semiconductor optical amplifier (vertical cavity SOA) according to an embodiment of the present invention.

[0036] Fig. 9 The figure shows a state where a plurality of telescopes are arranged in parallel according to an embodiment of the present invention.

[0037] Fig.10 A diagram showing the structure of a mobile phone receiving unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Hereinafter, the wireless optical charging system of the present invention will be described in detail with reference to the accompanying drawings.

[0039] Figure 1 FIG. 4 is a structural diagram of a wireless optical charging system according to an embodiment of the present invention.

[0040] According to one embodiment, the wireless optical charging system of the present invention may include a transmission unit 100 and a plurality of receiving units 200. According to various embodiments, the transmission unit 100 may divide the wavelength of the light source beam and transmit the light having increased energy through resonance with the receiver to the receiving unit 200.

[0041] According to one embodiment, the receiving unit 200 may receive the light transmitted from the transmitting unit 100 and convert a portion of the received light energy into electrical energy to charge the device. According to various embodiments, the transmitting unit 100 may include a light source unit 110, a diffraction grating 130, and a telephoto unit 140.

[0042] According to one embodiment, the transmission unit 100 may further include: a width expansion unit 120 disposed at the front end of the diffraction grating 130; a direction conversion unit 150 disposed at the rear end of the diffraction grating 130; and a direction control unit 160 for controlling the direction of the direction conversion unit 150 or the diffraction grating 130.

[0043] According to an embodiment, as light is incident on the light source part 110, resonance may occur and light energy may be increased. According to various embodiments, the light source part 110 includes a gain medium, and the gain medium may generate light by receiving power and amplify the power of the light.

[0044] According to one embodiment, a bidirectional semiconductor optical amplifier (Semiconductor Optical Amplifier, Innolume, SOA-1030-20-HI-40dB) having a central wavelength of 1033.6nm and a full width at half maximum of 21.9nm is used as the light source unit 110. When a current of 800mA is applied to the semiconductor optical amplifier, light can be generated and wavelength can be amplified. According to various embodiments, the diffraction grating 130 can spatially divide the light output from the width extension unit 120 into a semiconductor optical amplifier light source wavelength region.

[0045] According to an embodiment, when the wavelength division method is one-dimensional (1D) division, one diffraction grating 130 may be used, and when the wavelength division method is two-dimensional (2D) division, two diffraction gratings may be used, or a virtually imaged phase array (VIPA) and one diffraction grating 130 may be used. Hereinafter, mλ=p(sinα+sinβ) is a formula representing a diffraction grating, wherein m may represent an order, p represents a grating interval, α represents an incident angle to the diffraction grating, and β represents a diffraction angle.

[0046] In one embodiment disclosed in the present invention, a diffraction grating of 1200 grooves / mm is used. According to one embodiment disclosed in the present invention, when the incident angle of light is 16°, the angle of light propagating from the diffraction grating into space can be obtained based on the minimum wavelength and the maximum wavelength of the half-maximum full width of the semiconductor optical amplifier. According to one embodiment, since the line width of the semiconductor optical amplifier is very small, the angle of light propagation in space may be very small. According to various embodiments, the angle of light propagating in space is 5.8°, and parallel light can be formed when only one wavelength is observed.

[0047] According to an embodiment, the channel linewidth may quantify the spectral purity of the laser light in the resonance. According to various embodiments, the spectral purity may be limited by the resolution R of the above-mentioned diffraction grating given by the following mathematical formula 1.

[0048] Mathematical formula 1

[0049]

[0050] In the above mathematical formula 1, λ c is the central wavelength of the incident light, δλ is the line width, N is the number of grooves illuminated by the light beam, and m is the diffraction order.

[0051] According to one embodiment, it can be inferred from the above mathematical formula 1 that since the above diffraction grating has a limited number of grooves, the line thickness can be limited. According to various embodiments, if the beam diameter W of the incident light is known, I , the irradiation length W can be calculated O .

[0052] According to an embodiment, for a known grating pitch p, it can be found that the number of grooves illuminated by the beam is negligible. According to various embodiments, the line width of the channel defined by the following mathematical formula 2 can be limited to a plane mirror or retroreflector far from the diffraction grating.

[0053] Mathematical formula 2

[0054]

[0055] According to one embodiment, considering a retroreflector in place of the above-mentioned plane mirror, the divergent angle dispersed beam that collides with the retroreflector can be redirected back into the cavity. According to various embodiments, a wide range of wavelengths can be captured into the cavity by the retroreflector compared to the plane mirror. The captured wavelengths can contribute to a wider channel linewidth. Through the above effects, the separation between short transmitter-receivers where multiple resonant lines compete for resonance can be more clearly defined.

[0056] According to one embodiment, the light divided by the diffraction grating 130 may have a smaller field of view (FOV). According to various embodiments, the telephoto unit 140 is composed of two lenses, namely a first lens and a second lens, which may be used to control the field of view (FOV).

[0057] According to one embodiment, the control of the field of view may be a preferred characteristic for controlling the area for configuring the receiving unit 200 so that the transmitting unit 100 of the wireless optical charging system of the present invention operates in a power transfer mode. According to various embodiments, the field of view imparted by the diffraction grating 130 is fixed by the spectrum of the gain medium and the grating parameters and cannot be selected independently of these parameters. The dependence of the field of view on the parameter may be resolved by adding the telephoto unit 140 having two lenses to the transmitting unit 100. The field of view imparted by the diffraction grating to broadband incident light may be obtained by calculating the diffraction angle using the following mathematical formula 3 which is a conventional diffraction equation.

[0058] Mathematical formula 3

[0059]

[0060] In the above mathematical formula 3, λ l is the diffracted optical wavelength, p is the grating spacing, θ i and θ d are the angles formed by the incident light and the diffracted light relative to the normal to the diffraction grating.

[0061] If we use θ dmin and θ dmax Defined by the shortest wavelength λ min and the longest wavelength λ max The diffraction angle formed is θ, then the field of view is dmin -θ dmax That is, the SOA spectral bandwidth and grating parameters may limit the field of view.

[0062] According to one embodiment, in order to control the field of view without changing the parameters of the semiconductor optical amplifier or the grating, a lens telescope structure can be used. According to various embodiments, the light from the collimator can be collimated by the first lens. On a plane, the spot sizes of the first lens and the second lens can be the same.

[0063] According to one embodiment, the field of view may be calculated by the following mathematical formula using a first lens having a focal length of 200.0 mm and a second lens having a focal length of 75.0 mm.

[0064] Mathematical formula 4

[0065]

[0066] In the above formula 4, f1 is the focal length of the first lens, f2 is the focal length of the second lens, α is the angle of light diffused from the diffraction grating, and β is the field of view finally diffused in space.

[0067] According to one embodiment, the angle β of the final diffusion into space may be greater than the angle α of the light diffused from the diffraction grating. According to various embodiments, the field of view may be determined by the second lens. As a result, the dependence of the field of view is transferred from the selection of the diffraction grating or the semiconductor optical amplifier parameters to the selection of the second lens.

[0068] According to one embodiment, the second lens can be selected at the design stage, and the second lens can be adjusted in real time using a variable focal length lens to achieve a desired field of view. In order to improve the field of view, the telephoto unit is described as having a two-lens structure consisting of a first lens and a second lens, but in order to further improve the field of view, a four-lens structure can be implemented by further adding two lenses (a pair of telephoto units).

[0069] According to one embodiment, the direction control unit may control the direction of the light passing through the telephoto unit based on a mirror so that the light is transmitted to the receiving unit. According to various embodiments, the receiving unit may be a retroreflective beam splitter that completes a resonance channel for excitation of the light source within the receiving unit by reflecting a narrow band of light returned to the transmission unit.

[0070] According to one embodiment, the receiving unit may include various mobile devices or IoT sensors that need to be charged, a retro-reflector, and an energy conversion unit. According to various embodiments, the receiving unit may be carried on a mobile or fixed device to directly charge the device it carries, and after being separated and fixed in a specific position, the separated device may be charged wired or wirelessly through a separate mechanism.

[0071] According to one embodiment, the retroreflector plays a role of reflecting incident light at the same angle and is arranged in a cubic form, and the interval between the central cells can be 4 mm. According to various embodiments, the receiving unit can transmit a portion of the power of the light source to the device requiring power according to the power division rate of the retroreflector.

[0072] According to one embodiment, since the retroreflector of the above-mentioned receiving unit returns the direction of the light beam to the incident trajectory regardless of the incident angle, it may be easy to align. According to various embodiments, as the retroreflector of the receiving unit, a spherical retroreflector in the form of a corner cone or a ball lens can be used, and the above-mentioned spherical retroreflector only reflects a part of the light beam and transmits about 80%.

[0073] According to one embodiment, the retroreflector may also use a micro ball lens array, i.e., a plurality of ball lenses arranged in a row. According to various embodiments, if the spot size of the light beam incident on the retroreflector is negligible, the reflected light beam may be reflected parallel to the incident path without returning to the incident path.

[0074] According to one embodiment, it may be difficult to provide a self-alignment mechanism between the transmission unit and the receiving unit. For example, if the beam is not self-aligned, the beam will not be recombined to the transmission unit module and cavity breakage may occur.

[0075] According to one embodiment, cavity cracking can be mitigated when the spot size of the incident light is similar to the pitch of the retroreflector described above. According to various embodiments, if the spot size is increased, self-alignment can be increased, but the efficiency of self-alignment can still be determined based on the incident angle. For example, the power efficiency of the retroreflector described above decreases with increasing incident angle and can depend on the acceptance angle of the retroreflector.

[0076] According to an embodiment, when high-power power is incident on the retroreflector, a problem of battery temperature increase may occur. Therefore, in order to solve this problem, an optical diffuser may be configured after the retroreflector to evenly divide the light spatially and emit it to make it incident on the battery. According to various embodiments, the optical diffuser may minimize or eliminate high-intensity bright spots by evenly dispersing the light over the entire surface.

[0077] According to one embodiment, the energy conversion unit may detect the light that is not reflected and passes through the interval of the central battery in the incident light and convert it into electric energy. According to various embodiments, the energy conversion unit includes a solar cell or a photovoltaic cell, which converts the corresponding light energy into electric energy after detecting the light that passes through the interval of the central battery, and the electric energy may be used to charge the receiving unit.

[0078] Figure 2 1 is a diagram showing a wireless optical charging system according to a first embodiment of the present invention. More specifically, Figure 2 A wireless optical charging system using a light transmitting mirror 130 ′ is shown.

[0079] According to an embodiment, the transmission unit 100 of the wireless optical charging system may include a light source unit 110, a light transmitting mirror 130' and a collimator 170. According to various embodiments, as light is incident, the light source unit 110 may increase output light energy through resonance.

[0080] According to one embodiment, the light transmitting mirror 130' is disposed at the output end of the light source unit 110, and can transmit all the light outputted by the light source unit 110 to the receiving unit. According to various embodiments, the collimator 170 is disposed between the light source unit 110 and the light transmitting mirror 130', and can convert the light outputted from the light source unit 110 into parallel light.

[0081] According to one embodiment, the transmission unit 100 of the wireless optical charging system can expand the limited viewing angle (field of view (FOV)) of the light beam by x, y control of the light transmission mirror 130', a spatial light modulator (SLM), a digital micromirror device (DMD), a microelectromechanical system micromirror (MEMS), and beam steering control using a small mirror instead of a rotating grating. According to various embodiments, in the case where the light transmission mirror 130' is used instead of a rotating grating in the transmission unit 100 of the wireless optical charging system, the receiving unit may include a bandpass filter that detects and receives only signals in a specific wavelength band.

[0082] According to one embodiment, a beam expander 123 for expanding and extending the width of light may be disposed between the collimator 170 and the light transmitting mirror 130'. According to various embodiments, the light source unit 110 may include various types of semiconductor optical amplifiers. For example, the light source unit 110 may also include a doped fiber amplifier, a solid-state optical amplifier. On the other hand, according to the present invention, in addition to semiconductor optical amplifiers, various types of optical amplifiers may be included in the light source unit 110.

[0083] According to one embodiment, the optical fiber-based optical amplifier may include an erbium or ytterbium doped fiber amplifier (EDFA or YBFA: Erbium or Ytterbium doped fiber amplifier). Figure 6For example, a unidirectional lasing structure, a bidirectional lasing structure, an optical connection structure based on an optical fiber or based on free space can be considered.

[0084] According to an embodiment, the light source unit 110 may include an optical bandpass filter that increases the optical signal to noise ratio (OSNR) of the incident optical signal by filtering the light incident to the receiving unit. According to various embodiments, the optical bandpass filter may also be included in the transmission unit 100 or the receiving unit.

[0085] Figure 3 FIG. 2 is a diagram showing a wireless optical charging system according to a second embodiment of the present invention.

[0086] According to an embodiment, the transmission unit 100 may include a receiving unit detection module 190 and a direction control part 160. According to various embodiments, the receiving unit detection module 190 may detect the receiving unit 200 located in a space for outputting the light of the transmission unit 100.

[0087] According to an embodiment, the receiving unit detection module 190 may include a photographing unit 191, a receiving unit detection unit 192, and a tracking signal generating unit 193. According to various embodiments, the photographing unit 191 has a structure corresponding to a depth camera or a charge coupled device (CCD) camera, and may photograph a space for the transmission unit 100 to output light.

[0088] According to an embodiment, the receiving unit detection unit 192 may detect the receiving unit 200 using the light emitting diode light of the receiving unit 200 driven in the image captured by the capturing unit 191, or may detect the receiving unit through image analysis based on machine learning. According to various embodiments, the tracking signal generation unit 193 may generate a tracking signal that enables the light transmitting mirror 130' to transmit light by tracking the receiving unit 200 detected by the receiving unit detection unit 192 under the control of the direction control unit 160.

[0089] That is, when the tracking signal generated by the tracking signal generating unit 193 is transmitted to the direction controlling unit 160 for controlling the direction of the light transmitting mirror 130 ′, the direction controlling unit 160 can control the direction so that the light transmitting mirror 130 ′ can transmit light along the receiving unit direction detected by the receiving unit detecting unit 192 .

[0090] According to one embodiment, the tracking signal generating unit 193 can confirm the charging state by the brightness of the LED light formed on the receiving unit 200. That is, when the brightness of the LED light is bright, the tracking signal generating unit 193 can confirm that the charging state is good, and when the brightness of the LED light is dark, it can be confirmed that the charging state is bad. According to various embodiments, the charging state of the receiving unit 200 can be confirmed by Bluetooth communication of the portable terminal.

[0091] According to an embodiment, the tracking signal generating unit 193 may generate a tracking signal to charge the receiving unit 200 in a bad charging state from the charging state by confirming the charging state of the receiving unit 200. According to various embodiments, the receiving unit detecting module 190 may perform beam steering control to detect the maximum power after performing beam steering control by confirming the charging state.

[0092] According to one embodiment, a beam expander for diffusing and expanding the width of light may be disposed between the collimator 170 and the light transmitting mirror 130' so that the light with expanded width is incident on the light transmitting mirror 130'. According to various embodiments, a diffraction grating for expanding the width of light by dispersing light may be disposed between the collimator 170 and the light transmitting mirror 130'.

[0093] According to one embodiment, the direction control unit 160 may include an output information receiving unit (PD), an analysis unit (PCcontrol) and a motor driver. According to various embodiments, the output information receiving unit is connected to the light source unit 110 to receive the output information of the output light source, the analysis unit analyzes the output information, and the motor driver can control the direction of the light transmission mirror 130' through the analyzed output information.

[0094] According to one embodiment, in the light transmitting mirror 130', one mirror can supply power to multiple receiving units, and multiple mirrors can also supply power to multiple receiving units of the bandpass filter 230 having different central wavelengths. According to various embodiments, the direction control unit 160 can control the direction of the light transmitting mirror 130' by receiving a direction control signal.

[0095] According to one embodiment, the light source part 110 may generate resonance along at least one direction with respect to incident light to amplify light energy. Figure 2 1 shows a case where the light source unit 110 generates resonance along one direction, but according to an embodiment, the number of directions in which resonance is generated may be increased. Figure 6 The structure of the light source unit configured according to the number of resonance directions will be described later in the description.

[0096] According to an embodiment, when the light transmitting mirror 130 ′ is used in the transmission unit 100 of the wireless optical charging system, the reception unit 200 may include a band pass filter 230 that detects and receives only a signal of a specific wavelength band.

[0097] On the other hand, although not shown, according to one embodiment, the receiving unit 200 may include: a spherical ball lens for resonating a portion of the wavelength of the incident light for further charging; and a photovoltaic cell (PV cell), the converted electric energy being charged. According to various embodiments, the receiving unit 200 may be configured with a glass substrate or a plastic substrate at the upper end of the ball lens for reducing the reflectivity of the light incident to the receiving unit.

[0098] Figure 4 FIG. 1 is a diagram showing a wireless optical charging system according to a third embodiment of the present invention.

[0099] Figure 4 The structure of the transmission unit 100 shown in FIG. 1 may be similar to Figure 3 The structure of the transmission unit 100 shown in FIG. Figure 4 The light source unit 110, the direction control unit 160, the collimator 170, the light transmitting mirror 130' and the receiving unit detection module 190 can be connected with Figure 3 The same or similar operation as the structure shown in FIG.

[0100] According to one embodiment, Figure 4 The transmission unit 100 may include a diffraction grating 130 between the collimator 170 and the light transmission mirror 130'. According to various embodiments, the diffraction grating may divide the light received from the light source part 110 into wavelengths within the semiconductor optical amplifier light source wavelength region to output into space.

[0101] On the other hand, in the wireless optical charging system of the fourth embodiment of the present invention, the structure of the transmission unit 100 can be similar to Figure 3 According to one embodiment, the light source unit 110, the direction control unit 160, the collimator 170 and the receiving unit detection module 190 constituting the wireless optical charging system of the fourth embodiment can be connected to Figure 3 The same or similar operation as the structure shown in FIG.

[0102] According to an embodiment, the transmission unit 100 constituting the wireless optical charging system of the fourth embodiment can be Figure 3 The transmission unit 100 is structured by replacing the light transmission mirror 130' with the diffraction grating 130. According to various embodiments, the direction control unit 160 may control the direction of the diffraction grating 130 by receiving output information of the light source output from the light source unit 110.

[0103] According to one embodiment, the motor driver constituting the direction control unit 160 can control the direction of the diffraction grating 130 by analyzing the output information. According to various embodiments, the diffraction grating 130 can change the direction under the control of the direction control unit 160 while dividing the light received from the light source unit 110 into wavelengths within the wavelength region of the semiconductor optical amplifier light source and outputting them into space.

[0104] According to one embodiment, in the case of one-dimensional division of light, the direction of the diffraction grating 130 can be further controlled by the direction control unit 160 while using one diffraction grating 130. According to various embodiments, in the case of two-dimensional division of light, the direction of the diffraction grating 130 can be further controlled by the direction control unit 160 while using a virtual image phase array (VIPA) and one diffraction grating 130 to achieve wavelength division.

[0105] According to an embodiment, the collimator 170 is disposed between the light source unit 110 and the diffraction grating 130 , and can convert the light output from the light source unit 110 into parallel light rays and transmit the parallel light rays to the diffraction grating 130 .

[0106] Figure 5 FIG. 1 is a diagram showing a case where a plurality of semiconductor optical amplifier (SOA) light sources are used according to an embodiment of the present invention.

[0107] According to one embodiment, Figure 5 As shown, the light source unit may include a plurality of semiconductor optical amplifiers. According to various embodiments, the plurality of semiconductor optical amplifiers may correspond to the same or different wavelength bands, respectively. For example, semiconductor optical amplifier 1 may generate light with a wavelength corresponding to a first wavelength band λ1, semiconductor optical amplifier 2 may generate light with a wavelength corresponding to a second wavelength band λ2, and semiconductor optical amplifier n may generate light with a wavelength corresponding to an nth wavelength band λ n corresponding wavelength of light.

[0108] According to an embodiment, the field of view of the transmission unit can be expanded by configuring the light source section including a plurality of semiconductor optical amplifiers having different wavelength bands.

[0109] Figure 6 FIG. 1 is a diagram showing the structure of a deformable light source unit according to an embodiment of the present invention.

[0110] According to an embodiment, the structure of the light source section may vary according to the direction in which resonance is generated in the light source section, that is, according to whether it is bidirectional or unidirectional through the semiconductor optical amplifier. For example, the light source section may include a mirror, a semiconductor optical amplifier, and at least one collimator to generate resonance in free space in both directions. According to various embodiments, resonance may be generated in free space in one direction by including a reflective semiconductor optical amplifier (RSOA: reflective SOA) or a vertical cavity semiconductor optical amplifier (VCSOA: vertical cavity SOA) and a collimator in the light source section.

[0111] According to one embodiment, the light source unit may include a bidirectional optical fiber. According to various embodiments, the light source unit may include a bidirectional optical fiber, a coupler, a semiconductor optical amplifier, and a collimator, and the bidirectional optical fiber may resonate in both directions for incident light to amplify light energy. For example, the light source unit including the bidirectional optical fiber may resonate in two directions along the optical fiber.

[0112] According to one embodiment, the coupler outputs the light moving in the bidirectional optical fiber at a specified ratio, and the semiconductor optical amplifier is formed at the output end of the coupler, which can provide a broadband gain spectrum with signal gain for the above light. According to various embodiments, the collimator is formed on the path of the bidirectional optical fiber and formed at the output end of the semiconductor optical amplifier, which can maintain the polarization of the light.

[0113] According to one embodiment, the light source unit may include a plurality of direction conversion mirrors for converting the moving direction of light at the corner portion, instead of the optical fiber. According to various embodiments, the collimator is disposed between the semiconductor optical amplifier and the isolator of the light source unit, and the light output from the semiconductor optical amplifier may be converted into parallel light. By including a plurality of direction conversion mirrors, semiconductor optical amplifiers, collimators, and isolators in the light source unit to generate resonance in free space, light for charging may be emitted and received between multiple receivers.

[0114] According to an embodiment, the light source unit may include a beam splitter. According to various embodiments, the beam splitter is disposed at an output end of the light source unit and may split light incident from the light source unit into at least two directions.

[0115] According to an embodiment, the light source unit may include a polarization-maintaining optical fiber, a semiconductor optical amplifier, an isolator, and a coupler. According to various embodiments, light having a constant electric field direction in any plane perpendicular to the direction of travel is called polarization, and the polarization-maintaining optical fiber can move the input power light while maintaining polarization. Resonance can be generated by including a polarization-maintaining optical fiber, a semiconductor optical amplifier, an isolator, and a coupler in the light source unit.

[0116] According to an embodiment, a semiconductor optical amplifier can provide a broadband gain spectrum with high signal gain for light. According to various embodiments, the light source part can be made compact by including a semiconductor optical amplifier in the light source part, and multiple wavelengths can be realized using a broadband light source.

[0117] According to one embodiment, the isolator can stabilize and enhance the performance of the transmission unit by allowing the light source to pass only in one direction. According to various embodiments, the coupler can transmit the broadband light source by receiving power from the collimator and outputting it from the semiconductor optical amplifier.

[0118] According to one embodiment, the isolator and the coupler may be replaced by a circulator, that is, the isolator and the coupler included in the light source unit described above may be replaced by a circulator.

[0119] According to an embodiment, in order to realize a low-cost light source unit, in addition to the circulator or isolator described above, it can only be realized by a coupler with a split ratio of 99:1 or 90:10 or different split ratios.

[0120] Figure 7 FIG. 1 is a diagram showing a case where a fiber laser is included in a light source unit according to an embodiment of the present invention.

[0121] According to one embodiment, the light source section may include a semiconductor optical amplifier instead of a fiber amplifier. According to various embodiments, the fiber amplifier is a fiber amplifier in which a low-level rare earth halide is added to a medium, which can adjust the output in a wide range, thereby being able to output light in a broadband manner. For example, the above-mentioned fiber laser may be composed of an Erbium or Ytterbium doped fiber.

[0122] According to one embodiment, as the light source unit includes an optical fiber amplifier instead of a semiconductor optical amplifier, the light source unit may further include a laser pump and an optical wavelength combiner. According to various embodiments, the laser pump may add a small amount of external light to the single-mode optical fiber, and the optical wavelength combiner may combine the wavelengths of the light added by the laser pump and the light of the single-mode optical fiber. Figure 6 Description, Figure 7 The isolator and coupler shown in FIG. 1 may also be replaced by a circulator.

[0123] Figure 8 FIG. 1 is a diagram showing a case where a light source unit is configured as a vertical cavity semiconductor optical amplifier (vertical cavity SOA) according to an embodiment of the present invention.

[0124] According to one embodiment, Figure 8As shown, in the light source part, a plurality of vertical cavity semiconductor optical amplifiers can be configured in an array form. According to various embodiments, when the light source part is configured by vertical cavity semiconductor optical amplifiers, light can be output from the stacked surface of the semiconductor optical amplifiers.

[0125] According to an embodiment, a vertical cavity semiconductor optical amplifier may be similar to a vertical cavity surface emitting laser (VCSEL). However, the reflectivity of the VCSEL may be lower than the reflectivity of the upper mirror of the VCSEL, so that the laser threshold cannot be reached.

[0126] According to an embodiment, according to a vertical cavity semiconductor optical amplifier, not only the one-way gain through a small number of quantum wells is reduced, but also the gain bandwidth can be substantially reduced. Therefore, in order to obtain high gain through a vertical cavity semiconductor optical amplifier, a high upper end reflectivity may be required. According to various embodiments, a vertical cavity semiconductor optical amplifier can be manufactured to have a smaller size than other semiconductor optical amplifiers and can have a lower drive current. In addition, the vertical cavity semiconductor optical amplifier also has the advantages of being cheaper than other semiconductor optical amplifiers and the manufacturing process of the semiconductor optical amplifier is easy.

[0127] Fig. 9 FIG. 1 is a diagram showing a case where a plurality of telescopes are arranged in parallel according to an embodiment of the present invention. According to an embodiment, light whose wavelength is divided by a diffraction grating has a small field of view and can be incident on the telescope. According to various embodiments, due to aberration, a field of view of ±45° (i.e., 90°) may not be obtained by one telescope. Therefore, in order to solve this problem, Fig. 9 As shown, the telephoto section may be composed of a plurality of telephoto sections.

[0128] According to one embodiment, Fig. 9 As shown, the telescope unit can be composed of three telescope units telescope1, telescope2, and telescope3. By arranging two of the three telescope units telescope2 and telescope3 in parallel, the angle of light finally diffused into space can be made larger than the angle of light diffused by the diffraction grating.

[0129] According to one embodiment, the plurality of telescopes constituting the present invention may respectively include: a first lens into which light is incident; and a second lens for outputting the light transmitted through the first lens to space. According to various embodiments, a blocking portion for blocking a portion of the light transmitted through the second lens may be formed at the center of the second lens of each of the telescopes telescope2 and telescope3 arranged in parallel.

[0130] According to an embodiment, due to reflection of light incident at right angles to a diffraction grating or a lens (which may include a first lens and a second lens), high-power light that is harmful to the human body may be transmitted through the transmission unit. For example, even if it is not a power transmission mode in which power is transmitted by resonance, high-power light that is harmful to the human body may be transmitted through the transmission unit. According to various embodiments, in the case of a bidirectional laser cavity, the above-mentioned blocking portion can remove a resonance signal caused by a signal reflected from the center of the lens.

[0131] Fig.10 A diagram showing the structure of a mobile phone receiving unit according to an embodiment of the present invention.

[0132] According to one embodiment, the receiving unit may include: an image sensor (CMOS sensor) related to image acquisition; a spherical ball lens (ball lens) that resonates with a portion of the wavelength of the incident light; and a relay unit for selectively transmitting the light incident to the above-mentioned receiving unit toward the above-mentioned image sensor or the above-mentioned ball lens. According to various embodiments, as needed, when it is necessary to control the above-mentioned relay unit to acquire an image, the receiving unit may transmit the received light toward the image sensor, and when it is necessary to charge the photovoltaic cell (PV cell), the received light may be transmitted toward the ball lens.

[0133] According to one embodiment, the relay unit may be formed by using a prism or two dichroic filters. Fig.10 Part (a) shows the structure of the receiving unit when the relay unit is composed of a prism. Fig.10 Part (b) shows the structure of the receiving unit when the relay unit is composed of two dichroic filters.

[0134] On the other hand, although not shown, according to an embodiment, the receiving unit may further include a substrate for reducing the reflectivity of light incident from the outside. According to various embodiments, a portion of the wavelength of light incident through the substrate may resonate through the ball lens. For example, the substrate may include a glass substrate or a plastic substrate coated with an anti-reflection coating to remove the reflection of light.

[0135] According to one embodiment, an optical diffuser for dispersing strong power may be included after the photovoltaic cell. According to various embodiments, in order to expand the field of view of the receiving unit, a micro ball lens array structure in which multiple ball lenses are arranged in a row may be used instead of a ball lens.

[0136] on the other hand, Figures 2 to 9 The structure of the transmission unit and the structure of the light source part which can be configured as a typical embodiment of the present invention are shown. Therefore, the scope of rights of the present invention should not be limited to Figures 2 to 9 For example, the structure shown in FIG. can be appropriately combined or changed according to the needs of the designer. Figures 2 to 9 The scope of the rights of the present invention can be extended to unit structures that can be combined within the scope of the conventional technical level. Therefore, it will be observed below that Figures 2 to 9 Various embodiments derived from this.

[0137] According to an embodiment, the transmission unit may include a light source unit, a direction control unit, a diffraction grating, and a collimator. According to various embodiments, the light source unit may include a polarization maintaining fiber, a semiconductor optical amplifier, an isolator, and a coupler.

[0138] According to one embodiment, the direction control unit may control the direction of the diffraction grating by receiving output information of the light source output from the light source unit. According to various embodiments, the direction control unit includes an output information receiving unit, an analyzing unit, and a motor driving unit, the output information receiving unit receiving output information of the light source connected to the light source unit for output, the analyzing unit analyzing the output information, and the motor driving unit controlling the direction of the diffraction grating by using the analyzed output information.

[0139] According to one embodiment, the collimator is disposed between the light source unit and the diffraction grating, and can convert the light output from the light source unit into parallel light rays and transmit the parallel light rays to the diffraction grating.

[0140] According to still another embodiment, in the transmission unit, since the core diameter of the light source part is very thin instead of the polarization maintaining fiber, a single mode fiber (SMF: Single mode fiber) having one propagation mode of light and having an accurate output wavelength can be used. According to various embodiments, a polarization control part can be formed at the input end and the output end of the semiconductor optical amplifier so that the light moving in the single mode fiber can maintain polarization.

[0141] According to another embodiment, the transmission unit may be composed of only a light source part, a diffraction grating and a collimator without the above-mentioned direction control part.

[0142] According to another embodiment, the transmission unit may have the following structure: a plurality of the semiconductor optical amplifiers included in the light source unit are connected in parallel, and the couplers are respectively arranged at the nodes of the input ends and output ends of the plurality of the semiconductor optical amplifiers.

[0143] According to another embodiment, the transmission unit further includes a direction conversion unit, which is equivalent to a spatial light modulator (SLM), a digital micromirror device (DMD), a micro-electromechanical system micro-mirror (MEMS mirror) or a plurality of small mirrors, and is disposed at the output end of the diffraction grating, and can convert the direction of the light output from the diffraction grating by being controlled by the direction control unit.

[0144] According to another embodiment, the transmission unit may be composed of only a light source part, a diffraction grating, a collimator, and a spectrometer without the above-mentioned direction control part.

[0145] According to still another embodiment, in the transmission unit, the direction control section may control the direction conversion section instead of the diffraction grating.

[0146] According to another embodiment, the transmission unit may include a width extension unit and a telescope unit. According to various embodiments, the width extension unit includes a collimator, a polarization film, and a beam expander, and before the light output from the light source unit is input to the diffraction grating, the width of the light may be extended to maximize the reflection of the light.

[0147] According to one embodiment, the collimator forms the light transmitted from the light source unit into parallel light, the polarizing film adjusts the polarization of the light distorted in the space, and the beam expander can expand the width of the light whose polarization is maintained by the parallel light. According to various embodiments, if the size of the light incident to the receiving unit is not large enough, it is difficult for the light to enter the light path, so in order to reflect the largest light beam, the width expansion unit can increase the width of the passing light beam to 8.68 mm by using the beam expander with a 5-fold magnification.

[0148] According to an embodiment, the light source section may include a circulator instead of a coupler. According to various embodiments, the circulator may guide the light through a 99:1 tap coupler before the light output from the output port of the semiconductor optical amplifier is input to a collimator located in free space.

[0149] According to yet another embodiment, the transmission unit may include a light source portion, a width extension portion, and a telephoto portion.

[0150] According to another embodiment, the transmission unit may include a width extension portion, a telephoto portion, a diffraction grating, and a light source portion.

[0151] According to yet another embodiment, the transmission unit may include a width extension unit, a telephoto unit, a diffraction grating, a light source unit, and a direction control unit.

[0152] According to another embodiment, in the transmission unit, a bidirectional optical fiber can be used in the light source unit. More specifically, the light source unit in this embodiment includes a bidirectional optical fiber, a coupler, a semiconductor optical amplifier and a polarization control unit, and the bidirectional optical fiber can bidirectionally resonate the incident light to amplify the light energy.

[0153] According to another embodiment, the transmission unit may output light to the receiving unit using a reflector in free space without an optical fiber. More specifically, the light source unit may include a reflector, a semiconductor optical amplifier, and a collimator, and the reflector may increase light energy by reflecting incident light in free space and generating resonance. According to various embodiments, the semiconductor optical amplifier may provide a broadband gain spectrum having a signal gain for light reflected from the reflector and incident thereon. On the other hand, the collimator is disposed between the reflector and the semiconductor optical amplifier, and may convert the output light into parallel light.

[0154] According to another embodiment, the transmission unit may have the following structure: a plurality of the semiconductor optical amplifiers included in the light source unit are connected in parallel, and the couplers are respectively arranged at the nodes of the input ends and the output ends of the plurality of semiconductor optical amplifiers.

[0155] According to one embodiment, the receiving unit can be optically charged by transmitting light to the receiving unit through a light transmitting mirror instead of a diffraction grating. According to various embodiments, when the above-mentioned diffraction grating is used, multiple receiving units can be charged simultaneously using multiple wavelengths, but the amount of electricity charged to the above-mentioned receiving units may be small compared to the time. In contrast, when the above-mentioned light transmitting mirror is used, one receiving unit can be charged intensively in a short period of time, so the amount of electricity charged to the above-mentioned receiving unit may be large compared to the time.

[0156] According to one embodiment, when the transmission unit of the present invention is set as a light source at the top of a specific space and a wavelength-divided light source is transmitted downward from the transmission unit, the light is received by a built-in receiving unit in a robot vacuum cleaner, a customer's mobile phone or a ringtone, etc. in the space, and the resonant light energy is converted into electrical energy, so that the device with the built-in receiving unit can be charged.

[0157] According to one embodiment, the transmission unit may divide the wavelength of the laser beam and transmit the light whose energy is increased by resonance to the above-mentioned receiving unit. More specifically, the light source unit of the above-mentioned transmission unit may generate light by receiving current. According to various embodiments, in this case, the above-mentioned light source unit uses a bidirectional semiconductor optical amplifier (SOA: semiconductor optical amplifier) ​​having a center wavelength of 1033.6nm and a full width at half maximum of 21.9nm, and as a current of 800mA is applied to the above-mentioned semiconductor optical amplifier, light can be generated and the wavelength can be amplified.

[0158] According to an embodiment, the light source unit of the transmission unit may increase light energy by resonance of incident light. According to various embodiments, the semiconductor optical amplifier of the light source unit may increase light gain.

[0159] According to one embodiment, in this case, in the light source section, the semiconductor optical amplifier for generating light has a feature of amplifying only wavelengths of the same polarization state, and thus polarization can be adjusted by a polarization modulator. According to various embodiments, the diffraction grating of the transmission unit can divide the light whose gain is increased in the light source section into wavelengths within the wavelength region of the semiconductor optical amplifier light source in space.

[0160] According to one embodiment, when the wavelength division method is one-dimensional division, a diffraction grating is used. When the wavelength division method is two-dimensional division, the division can also be performed by using two diffraction gratings, or the wavelength division can be achieved by using a diffraction grating and a virtual image phase array (VIPA: Virtually Imaged Phase Array).

[0161] According to one embodiment, the direction control unit of the transmission unit can control the direction of the diffraction grating, or can control the direction of light by controlling a direction conversion unit placed at the output end of the diffraction grating, so that the light can be transmitted in the direction of a receiving unit included in various mobile devices or Internet of Things (IoT) sensors that need to be charged. According to various embodiments, in the case of one-dimensional division, the direction of the diffraction grating can be further controlled by the direction control unit while using one diffraction grating.

[0162] According to one embodiment, in the case of two-dimensional division, in a state where wavelength division is achieved using a virtual image phase array (VIPA) and a diffraction grating, a direction control unit is further applied to control the direction of the diffraction grating.

[0163] According to one embodiment, the receiving unit can receive the light transmitted from the above-mentioned transmission unit, and charge the device by converting the energy of a part of the received light into electrical energy. More specifically, the retroreflector of the above-mentioned receiving unit can reflect the incident light at the same angle and allow a part of the incident light to pass backward.

[0164] According to one embodiment, the energy conversion unit of the receiving unit includes a solar cell or a photovoltaic cell for detecting light, and after detecting the light that has not been reflected and has passed through the retroreflector, the detected light energy can be converted into electrical energy. According to various embodiments, the energy conversion unit can charge the converted electrical energy to various devices with the receiving unit built in.

[0165] According to one embodiment, the present invention can be used in the field of drone charging. For example, the transmission unit disclosed in the present invention can be applied to a drone that provides charging power, and the receiving unit disclosed in the present invention can be applied to a drone that needs to be charged. That is, the drone corresponding to the receiving unit can be charged by converting a portion of the light energy transmitted from the drone corresponding to the transmission unit into electrical energy.

[0166] The preferred embodiments of the present invention are described above, but they can be modified in various ways, and it can be understood that ordinary technicians in the technical field to which the present invention belongs can make various modifications and variations without departing from the scope of protection of the present invention.

Claims

1. A wireless optical charging system, characterized in that: include: a transmission unit that transmits the wireless optical charging light source beam as energy-increased light through resonance; as well as a receiving unit, configured to receive the light transmitted from the transmission unit and convert a portion of the energy of the received light into electrical energy to charge the device, The light is reflected from the receiving unit to the transmitting unit to generate resonance between the transmitting unit and the receiving unit, thereby increasing the energy of the light. Wherein, the above transmission unit includes: Light source department; a diffraction grating, a prism or an arrayed waveguide grating for dividing the light received from the light source into wavelengths within a predetermined range and outputting the light into space; and The first collimator is disposed between the light source unit and the one of the diffraction grating, the prism and the arrayed waveguide grating, and is used to convert the light output from the light source unit into parallel light.

2. The wireless optical charging system according to claim 1, characterized in that: The transmission unit further includes a direction control section configured to control a direction of the one of the diffraction grating, the prism, and the arrayed waveguide grating by receiving output information of the light output from the light source section.

3. The wireless optical charging system according to claim 2, characterized in that: The transmission unit further includes a direction conversion unit, which is disposed at an output end of one of the diffraction grating, the prism and the arrayed waveguide grating, and converts the direction of light output from one of the diffraction grating, the prism and the arrayed waveguide grating by replacing the one of the diffraction grating, the prism and the arrayed waveguide grating under the control of the direction control unit.

4. The wireless optical charging system according to claim 1, characterized in that: The light source unit includes: Single-mode fiber has one mode of light propagation; A semiconductor optical amplifier, formed on the path of the single-mode optical fiber, for providing a broadband gain spectrum having a signal gain for the light; Isolators, which only allow light to pass along one direction; a polarization control unit formed at the input and output ends of the semiconductor optical amplifier and used to maintain the polarization of light; and A coupler receives power from the first collimator and outputs a broadband light source from the semiconductor optical amplifier to the one of the diffraction grating, the prism and the arrayed waveguide grating.

5. The wireless optical charging system according to claim 3, characterized in that: The light source unit includes: Single-mode fiber has one mode of light propagation; A fiber laser formed on the path of the single-mode optical fiber and capable of adjusting the output so as to output the light in a broadband manner; A laser pump, used to add light from an external light source to the single-mode optical fiber; An optical wavelength combiner for combining the wavelengths of the light added by the laser pump and the light of the single-mode optical fiber; Isolators, which only allow light to pass along one direction; A polarization control unit formed at the input end and the output end of the optical fiber laser and used to maintain the polarization of light; and A coupler is used to receive power from the first collimator and output a broadband light source from the fiber laser to the one of the diffraction grating, the prism and the arrayed waveguide grating.

6. The wireless optical charging system according to claim 1, characterized in that: The light source unit includes an optical bandpass filter. The optical bandpass filter increases an optical signal-to-noise ratio of an incident light signal by filtering the light incident to the light source unit.

7. The wireless optical charging system according to claim 3, characterized in that: The transmission unit further includes a spectrometer, which is disposed at the output end of the light source unit and is used to split the light incident from the light source unit into two and transmit the light to the direction control unit and the diffraction grating, the prism and the arrayed waveguide grating. The light source unit includes: A plurality of direction conversion mirrors are used to form a moving path of light by converting the moving direction of light; A semiconductor optical amplifier, formed on the moving path, for providing a broadband gain spectrum having a signal gain for the light; an isolator for allowing light to pass along only one side of the moving path; and The second collimator is disposed between the semiconductor optical amplifier and the isolator and is used to convert the light output from the semiconductor optical amplifier into parallel light.

8. The wireless optical charging system according to claim 1, characterized in that: The light source unit includes: Bidirectional optical fiber for bidirectional resonance; A coupler for outputting light traveling in the bidirectional optical fiber at a specified ratio; a semiconductor optical amplifier formed at the output end of the coupler and configured to provide a broadband gain spectrum having a signal gain for the light; and The polarization control unit is formed on the path of the bidirectional optical fiber and at the output end of the semiconductor optical amplifier, and is used to maintain the polarization of light.

9. The wireless optical charging system according to claim 1, characterized in that: The light source unit includes: The reflector, located in free space, increases the light energy by reflecting the incident light and the resonance process; a semiconductor optical amplifier for providing a broadband gain spectrum having a signal gain for light reflected from the above-mentioned reflector and incident thereon; and The third collimator is arranged between the reflector and the semiconductor optical amplifier, and is used for converting the output light into parallel light.

10. The wireless optical charging system according to claim 9, characterized in that: A plurality of the semiconductor optical amplifiers are connected in parallel, and couplers are respectively arranged at input end nodes and output end nodes of the plurality of the semiconductor optical amplifiers.

11. The wireless optical charging system according to claim 1, characterized in that: The receiving unit comprises: Retroreflectors, which reflect incident light at the same angle, are arranged in a cubic shape with a gap in the center; and The energy conversion unit detects the light that is not reflected and passes through the central space among the incident light and converts it into electric energy.

12. The wireless optical charging system according to claim 1, characterized in that: The receiving unit includes an optical bandpass filter, and the optical bandpass filter increases the optical signal-to-noise ratio of the incident optical signal by filtering the light incident to the receiving unit.

13. The wireless optical charging system according to claim 1, characterized in that: The receiving unit comprises: A substrate, used to reduce the reflectivity of light incident to the receiving unit; a spherical ball lens that resonates with a portion of the wavelength of light incident through the substrate; a light diffuser for dispersing light incident from the spherical ball lens by uniformly dividing the light into different spatial dimensions; and Photovoltaic cells, which are charged with converted electrical energy.

14. The wireless optical charging system according to claim 1, characterized in that: The receiving unit comprises: Image sensors, which are related to image acquisition; A spherical ball lens that resonates for a portion of the wavelength of incident light; and a relay unit, configured to selectively transmit the light incident to the receiving unit to the image sensor or the ball lens, The receiving unit includes a portable terminal capable of capturing images.

15. A wireless optical charging system, characterized in that: include: a transmission unit that transmits the wireless optical charging light source beam as energy-increased light through resonance; as well as a receiving unit, configured to receive the light transmitted from the transmission unit and convert a portion of the energy of the received light into electrical energy to charge the device, The light is reflected from the receiving unit to the transmitting unit to generate resonance between the transmitting unit and the receiving unit, thereby increasing the energy of the light. Wherein, the above transmission unit includes: Light source department; a light transmitting mirror, used for transmitting the light received from the light source portion to the receiving unit; and The fourth collimator is disposed between the light source and the light transmitting mirror, and is used for converting the light output from the light source into parallel light.

16. The wireless optical charging system according to claim 15, characterized in that: The transmission unit further includes: a receiving unit detection module, used to detect the receiving unit to receive the light generated by the light source; and The direction control unit is used to control the direction of the light transmitting mirror.

17. The wireless optical charging system according to claim 16, characterized in that: The above-mentioned receiving unit detection module includes: The shooting department is used to shoot the space; a receiving unit detection unit for detecting the receiving unit by using the light emitting diode light of the receiving unit generated by driving in the image captured by the capturing unit; and The tracking signal generating unit is used to generate a tracking signal so that the light transmitting mirror is controlled by the direction controlling unit to transmit light by tracking the receiving unit detected by the receiving unit detecting unit.

18. A wireless optical charging system, characterized in that: include: a transmission unit that transmits the wireless optical charging light source beam as energy-increased light through resonance; as well as a receiving unit, configured to receive the light transmitted from the transmission unit and convert a portion of the energy of the received light into electrical energy to charge the device, The light is reflected from the receiving unit to the transmitting unit to generate resonance between the transmitting unit and the receiving unit, thereby increasing the energy of the light. Wherein, the above transmission unit includes: Light source department; a width expansion section for expanding the width of the light output from the light source section before the light is input to the diffraction grating to increase the reflectivity of the light incident to the retroreflector of the receiver; A diffraction grating for dividing the light received from the width extension portion into wavelengths within a predetermined range and outputting the light to space; and The telephoto part is formed at the output end of the diffraction grating and is used to expand the field of view.

19. The wireless optical charging system according to claim 18, characterized in that: The telephoto unit includes a plurality of telephoto units, and a portion of the plurality of telephoto units are arranged in parallel.

20. The wireless optical charging system according to claim 18, characterized in that: The light source unit includes: Polarization-maintaining fiber, used to maintain the polarization of light; A semiconductor optical amplifier formed on the path of the polarization-maintaining optical fiber and configured to provide a broadband gain spectrum having a signal gain for the light; Isolators, which only allow light to pass in one direction; and A coupler is used to receive power from the width extension portion and output a broadband light source from the semiconductor optical amplifier to the diffraction grating.

21. The wireless optical charging system according to claim 18, characterized in that: The light source unit includes: Single-mode fiber has one mode of light propagation; A semiconductor optical amplifier, formed on the path of the single-mode optical fiber, for providing a broadband gain spectrum having a signal gain for the light; a polarization control unit formed at the input and output ends of the semiconductor optical amplifier and used to maintain the polarization of light; and A circulator is used to guide the light output from the output port of the semiconductor optical amplifier to the tap coupler before the light enters the collimator located in the free space.

22. The wireless optical charging system according to claim 18, characterized in that: The width extension part includes: a fifth collimator, for forming the light transmitted from the light source into parallel light; a polarizing film for adjusting polarization of light formed into parallel light rays and twisted in space by the fifth collimator; and A beam expander is used to expand the width of light that maintains polarization through the above parallel light.

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