公开(公告)号：US10901089B2

公开(公告)日：2021-01-26

申请号：US15936240

申请日：2018-03-26

Applicant: Chunshu Zhang ,  Patrick Dumais ,  Dominic John Goodwill

Inventor： Chunshu Zhang ,  Patrick Dumais ,  Dominic John Goodwill

IPC: G01S17/00 ,  G01S17/58 ,  G01S7/481 ,  G01S7/4861

Abstract: A coherent LIDAR method and apparatus are provided, in which two optical signals having a first frequency difference are reflected by an object. A difference in frequency between the corresponding received and reflected signals is determined. The frequency difference between the reflected signals differs from the first frequency difference due to Doppler effects. The object velocity is determined based on a comparison between the first frequency difference and the frequency difference in the reflected signals. The emitted signals can be produced by modulating a common light source. The reflected signals are inherently mixed at the receiver and further processed. Distance to the object can be determined by pulsing the emitted signals and measuring a time of flight by detecting corresponding pulse edges in the reflected signals, or by using phase sweeping. The emitter can be implemented using an optical phased array.

公开(公告)号：US20200012166A1

公开(公告)日：2020-01-09

申请号：US16573259

申请日：2019-09-17

Applicant: Patrick DUMAIS

Inventor： Patrick DUMAIS

IPC: G02F1/29 ,  G01S7/481 ,  G01S7/497 ,  G01S17/66 ,  G01S17/89

Abstract: A time-of-flight apparatus includes a transmitter and a receiver. The transmitter includes a laser for providing a laser pulse and an optical phased array coupled to the laser for receiving the laser pulse and providing a plurality of beams which fan out from the optical phased array. The receiver includes an optical receiving unit for receiving scattered light from the plurality of beams and a photodetector array coupled to the optical receiving unit. The photodetector array includes a plurality of photodetectors such that at least one particular photodetector of the photodetector array is disposed for receiving scattered light from each particular beam of the plurality of beams.

公开(公告)号：US09709738B1

公开(公告)日：2017-07-18

申请号：US15067443

申请日：2016-03-11

Applicant: Patrick Dumais

Inventor： Patrick Dumais

IPC: G02B6/125 ,  G02B6/122 ,  G02B6/14

CPC classification number: G02B6/125 ,  G02B6/1228 ,  G02B6/14

Abstract: A waveguide crossing includes a first waveguide and a second waveguide intersecting the first waveguide such that a gap equal to a width of the second waveguide is formed in the first waveguide, the second waveguide having a centerline defining a plane of symmetry. The first waveguide has a first waveguide section through which a single optical mode propagates, followed by a first non-adiabatic diverging taper, followed by a second waveguide section wider than the first waveguide section through which two even-order optical modes propagate, followed by a second non-adiabatic diverging taper, followed by a third waveguide section wider than the second waveguide section through which three even-order optical modes propagate. The three even-order modes synthesize to form a quasi-Gaussian beam that self-replicates symmetrically across the gap, thereby providing a low-loss waveguide crossing useful for photonic switching.

公开(公告)号：US10921453B2

公开(公告)日：2021-02-16

申请号：US15992020

申请日：2018-05-29

Applicant: Patrick Dumais ,  Eric Bernier ,  Mohammad Mehdi Mansouri Rad

Inventor： Patrick Dumais ,  Eric Bernier ,  Mohammad Mehdi Mansouri Rad

IPC: G01S17/88 ,  G01S7/481 ,  G02B26/10 ,  G02F1/29

Abstract: A LIDAR includes multiple light sources and a Liquid Crystal on Silicon (LCOS) device for controllably redirecting beams from each of the multiple light sources. The same or a different LCOS device can be used to controllably redirect reflected light to each of several corresponding light detectors. The LCOS device can be adjusted on a slower time scale while the light sources can be sequentially activated on a faster time scale. The LCOS device provides for fine steering control of LIDAR beams. The use of multiple light sources and detectors allows for a higher LIDAR scan rate.

公开(公告)号：US20200064547A1

公开(公告)日：2020-02-27

申请号：US15883418

申请日：2018-01-30

Applicant: Dominic John GOODWILL ,  Dritan CELO ,  Patrick DUMAIS

Inventor： Dominic John GOODWILL ,  Dritan CELO ,  Patrick DUMAIS

IPC: G02B6/122 ,  G02B6/12 ,  G02F1/295

Abstract: A photonic integrated circuit is provided that is adapted to compensate for an unintentional manufactured refractive index profile, such as a gradient, that arises due to manufacturing variance. The photonic integrated circuit including at least a thermal source and a spaced thermal sink to induce a thermal gradient in the photonic integrated circuit between the thermal source and the spaced thermal sink, the thermal gradient imparts an opposing thermal refractive index profile to correct for the manufactured refractive index profile. In some embodiments the photonic integrated circuit may be constructed with features that have an intentional structured refractive index profile that ensures any unintentional manufactured refractive index profile is correctable by the opposing thermal refractive index profile induced by the thermal source.

公开(公告)号：US09927575B2

公开(公告)日：2018-03-27

申请号：US15162765

申请日：2016-05-24

Applicant: Dominic John Goodwill ,  Patrick Dumais

Inventor： Dominic John Goodwill ,  Patrick Dumais

IPC: G02B6/27 ,  G02B6/32 ,  G02B6/34 ,  G02B6/30 ,  G02B6/126

CPC classification number: G02B6/2706 ,  G02B6/126 ,  G02B6/30 ,  G02B6/32 ,  G02B6/34 ,  G02B2006/12107 ,  G02B2006/12147

Abstract: An optical coupling apparatus for coupling an optical fiber to a photonic chip is described. The apparatus includes a collimating microlens for collimating light from the optical fiber; a polarization splitting beam displacer for separating the light collimated by the collimating microlens into orthogonally polarized X and Y component beams; at least one focusing microlens for directing the X and Y component beams separately onto the photonic chip; and first and second surface grating couplers (SGCs) orthogonally disposed on the photonic chip and configured for operation in a same polarization state, for coupling the X and Y component beams, respectively, to the photonic chip.

公开(公告)号：US20170329084A1

公开(公告)日：2017-11-16

申请号：US15154601

申请日：2016-05-13

Applicant: Dominic John Goodwill ,  Patrick Dumais

Inventor： Dominic John Goodwill ,  Patrick Dumais

IPC: G02B6/27 ,  G02B27/28

CPC classification number: G02B6/2793 ,  G02B6/272 ,  G02B6/2766 ,  G02B6/2773 ,  G02B6/2852 ,  G02B27/286

Abstract: An optical apparatus for compensating a measurement inaccuracy of polarization dependent loss (PDL) is described. The apparatus comprises a first polarization rotator splitter (PRS) for splitting an input beam into orthogonally polarized X and Y component beams and rotating one of the X and Y component beams to be in the same polarization as the other component beam; first and second circuits for processing the X and Y component beams respectively; a first polarization rotator combiner (PRC) for combining the X and Y component beams processed respectively by the first and second circuits into an output beam, one of the X and Y component beams being rotated to be orthogonally polarized with respect to the other component beam. The apparatus further comprises a first set of photodetectors for monitoring a first relative power between the X and Y component beams before the first and second circuits; a second set of photodetectors for monitoring a second relative power between the X and Y component beams processed respectively by the first and second circuits; and complementary PRSs and PRCs coupled between the first and second circuits and the second set of photo-detectors for compensating a measurement inaccuracy of PDL caused by the first PRS and PRC.

公开(公告)号：US20170237507A1

公开(公告)日：2017-08-17

申请号：US15041693

申请日：2016-02-11

Applicant: PATRICK DUMAIS ,  MOHAMMAD MEHDI MANSOURI RAD

Inventor： PATRICK DUMAIS ,  MOHAMMAD MEHDI MANSOURI RAD

IPC: H04B10/85 ,  H04Q11/00

CPC classification number: H04B10/85 ,  H04Q11/0066 ,  H04Q2011/0073

Abstract: Aspects of the present disclosure involve coherently mixing information in a first optical signal with information from one or more other optical signals, the optical signals being synchronous, to generate a mixed optical signal that obfuscates the information of the first optical signal. Each of the other optical signals is likewise mixed with a combination of the first and/or other optical signals resulting in a collection of mixed optical signals, none of which resemble the original first and other optical signals. When each of the mixed optical signals is transmitted in a separate optical fiber, then eavesdropping on only a single fiber cannot yield an unambiguous recovery of any one of the original optical signals.

公开(公告)号：US07471866B2

公开(公告)日：2008-12-30

申请号：US11167229

申请日：2005-06-28

Applicant: Patrick Dumais ,  Chris Ledderhof ,  Claire Callender ,  Chantal Blanchetiere ,  Julian Noad ,  Glendon Lovell

Inventor： Patrick Dumais ,  Chris Ledderhof ,  Claire Callender ,  Chantal Blanchetiere ,  Julian Noad ,  Glendon Lovell

IPC: G02B6/10 ,  H01L21/00

CPC classification number: B82Y10/00 ,  B82Y20/00 ,  G01N21/0303 ,  G02B6/10 ,  G02B6/122 ,  G02B6/1225 ,  G02B6/13 ,  G02B2006/12169 ,  G02B2006/12173 ,  G02B2006/12176

Abstract: The invention provides a method for fabricating planar waveguiding structures with embedded microchannels. The method includes the step of depositing, over a planar template having at least one indented feature comprising a ridge of a first optical material and a narrow trench adjacent thereto, a second optical material, and the step of subsequent annealing thereof, so that an embedded hollow microchannel forms within the trench. The method provides planar structures wherein the ridge and the embedded microchannel cooperate to form an optical waveguiding structure having a waveguiding direction collinear with the embedded microchannel. Embodiments of the method for forming microfluidic devices integrating ridge waveguides with hollow microchannels having surface access points for fluid delivery, and for forming photonic crystals, are disclosed together with corresponding device embodiments.

Abstract translation: 本发明提供一种用于制造具有嵌入式微通道的平面波导结构的方法。 该方法包括沉积在具有至少一个凹陷特征的平面模板上的步骤，该至少一个凹陷特征包括第一光学材料的脊和与其相邻的窄沟槽，第二光学材料和随后的退火步骤， 在沟槽内形成空心微通道。 该方法提供平面结构，其中脊和嵌入式微通道协作以形成具有与嵌入式微通道共线的波导方向的光波导结构。 与对应的装置实施例一起公开了用于形成集成脊状波导与具有用于流体输送的表面接入点和用于形成光子晶体的中空微通道的微流体装置的方法的实施例。

公开(公告)号：US10677987B1

公开(公告)日：2020-06-09

申请号：US16410430

申请日：2019-05-13

Applicant: Patrick Dumais

Inventor： Patrick Dumais

IPC: G02B6/27 ,  G02F1/01 ,  G02B6/12

Abstract: The present invention provides a photonic device such as a variable optical attenuator, in which two signal components, propagating in modes of two different polarization states, are converted to two different modes of the same polarization state prior to modulation. The modulation of both components is performed by a single device which applies the same modulation strength to both components. The two signal components can be converted back to propagate in the two different polarization states following modulation.