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1.发明授权公开(公告)号：US10359630B2
公开(公告)日：2019-07-23
申请号：US15199221
申请日：2016-06-30
发明人： Manan Raval , Ami Yaacobi , Michael R. Watts , Jerry Zhou , Jie Sun , Christopher V. Poulton
摘要： A display for augmented reality (AR) includes an array of optical phased arrays (OPAs) integrated into a transparent substrate. The array of OPAs emit light encoded with four dimensional (4D) light field including 2D spatial coordinates and 2D directional coordinates to create an image of a virtual object on a retina of a viewer. By adjusting the emission directions of light beam emitted by individual OPAs in the display, the depth perception can be adjusted accordingly. The array of OPAs can also be encoded with holographic information, including intensity and phase distribution, of a virtual object to create the image of the virtual object on the retina. The AR display can further incorporate liquid crystal (LC) into the OPAs for modulating the amplitudes and relative phases of light emitted by the OPAs.
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公开(公告)号：US10305253B2
公开(公告)日：2019-05-28
申请号：US15592905
申请日：2017-05-11
IPC分类号： H01S5/06 , H01S5/065 , H01S3/063 , H01S3/11 , H01S5/024 , H01S5/026 , H01S5/04 , H01S5/042 , H01S5/062 , H01S5/0625 , H01S5/10 , H01S3/08 , H01S3/082 , H01S3/16
摘要： An artificial saturable absorber uses additive pulse mode-locking to enable pulse operation of an on-chip laser operation. Four different artificial saturable absorbers are disclosed. The first includes an integrated coupler, two arms each containing some implementation of the end-reflector, and a phase bias element in one arm. The second includes an integrated directional coupler, two integrated waveguide arms, and another integrated coupler as an output. The third includes an integrated birefringent element, integrated birefringent-free waveguide, and integrated polarizer. And the fourth includes a multimode waveguide that allows for different modes to propagate in such a way that the difference in the spatial distribution of intensity causes a nonlinear phase difference between the modes. These are just some examples of an on-chip fully integrated artificial saturable absorber with instantaneous recovery time that allow for generation of sub-femtosecond optical pulses at high repetition rates using passive mode-locking.
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公开(公告)号：US10075245B2
公开(公告)日：2018-09-11
申请号：US15148789
申请日：2016-05-06
发明人： David O. Caplan , Michael R. Watts , Zhan Su
IPC分类号： H04J14/02 , H04B10/06 , H04B10/12 , H04B10/67 , H04B10/61 , H04B10/66 , G02B6/28 , H04B10/2575
CPC分类号： H04B10/677 , G02B6/12007 , G02B6/28 , G02B6/2938 , G02B6/29395 , G02F1/011 , G02F1/0147 , G02F2201/16 , G02F2203/055 , G02F2203/15 , G02F2203/58 , G02F2203/585 , H04B10/2575 , H04B10/61 , H04B10/66 , H04B10/67 , H04B10/671 , H04J14/02
摘要： An optical receiver includes a cascade of optical filtering elements, each of which selects spectral components from incoming optical signals at a wavelengths aligned to filter passbands. The selected spectral components may be optically combined to form k pairs of intermediary signals, where k=log2(M). By comparing the k pairs of intermediary signals, k bits of a digital signal representing the incident signal may be generated. The filtering elements may be configured to perform demultiplexing and demodulation simultaneously, increasing functionality and reducing excess losses. The filtering elements may also be tuned so that the optical receiver may be reconfigured to accommodate different combinations of wavelengths and modulation formats, such as wavelength division multiplexed (WDM) on off keying (OOK), M-ary orthogonal formats including frequency shift keying (FSK) and pulse position modulation (PPM), differential phase shift keying, and hybrid combinations—providing rate and format flexibility and WDM scalability.
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公开(公告)号：US10133149B2
公开(公告)日：2018-11-20
申请号：US15359149
申请日：2016-11-22
发明人： Erman Timurdogan , Michael R. Watts
摘要： A waveguide includes an array of p-i-n junctions formed by ions implanted into the waveguide. The p-i-n junctions concentrate electric fields applied on the waveguide to convert the third order susceptibility χ(3) into the second order susceptibility χ(2) and induce the DC Kerr effect. The periodic electrical fields concentrated by the p-i-n junctions effectively create a wave vector, which together with the wave vectors of optical beams in the waveguide satisfies phase matching conditions for nonlinear optical effects. The phase matching can significantly enhance the efficiency of the nonlinear optical effects, such as second harmonic generation, sum frequency generation, difference frequency generation, and four-wave mixing. Waveguides with arrays of PIN junctions can also be used in phase modulators, amplitude modulators, and filters.
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公开(公告)号：US11372106B2
公开(公告)日：2022-06-28
申请号：US16798538
申请日：2020-02-24
发明人： Ami Yaacobi , Michael R. Watts
IPC分类号： G01C3/08 , G01S17/36 , G01S7/4915 , G01S17/931 , G01S7/499
摘要： An optical phased array formed of a large number of nanophotonic antenna elements can be used to project complex images into the far field. These nanophotonic phased arrays, including the nanophotonic antenna elements and waveguides, can be formed on a single chip of silicon using complementary metal-oxide-semiconductor (CMOS) processes. Directional couplers evanescently couple light from the waveguides to the nanophotonic antenna elements, which emit the light as beams with phases and amplitudes selected so that the emitted beams interfere in the far field to produce the desired pattern. In some cases, each antenna in the phased array may be optically coupled to a corresponding variable delay line, such as a thermo-optically tuned waveguide or a liquid-filled cell, which can be used to vary the phase of the antenna's output (and the resulting far-field interference pattern).
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公开(公告)号：US10461489B2
公开(公告)日：2019-10-29
申请号：US15718045
申请日：2017-09-28
发明人： Purnawirman Purnawirman , Michael R. Watts , Ehsan Shah Hosseini , Jonathan B. Bradley , Jie Sun , Matteo Cherchi
IPC分类号： H01S3/063 , H01S3/16 , H01S3/17 , H01S3/091 , H01S3/08 , H01S3/083 , H01S3/094 , H01S3/23 , H01S3/105
摘要： Examples of the present invention include integrated erbium-doped waveguide lasers designed for silicon photonic systems. In some examples, these lasers include laser cavities defined by distributed Bragg reflectors (DBRs) formed in silicon nitride-based waveguides. These DBRs may include grating features defined by wafer-scale immersion lithography, with an upper layer of erbium-doped aluminum oxide deposited as the final step in the fabrication process. The resulting inverted ridge-waveguide yields high optical intensity overlap with the active medium for both the 980 nm pump (89%) and 1.5 μm laser (87%) wavelengths with a pump-laser intensity overlap of over 93%. The output powers can be 5 mW or higher and show lasing at widely-spaced wavelengths within both the C- and L-bands of the erbium gain spectrum (1536, 1561 and 1596 nm).
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