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公开(公告)号：US20230393445A1
公开(公告)日：2023-12-07
申请号：US17805342
申请日：2022-06-03
Applicant: II-VI Delaware, Inc.
Inventor： Helen Chen , Guomin Jiang , Tom Li , Lawrence Wang , Jim Yuan
CPC classification number: G02F1/292 , G02F1/3131 , H04J14/0212 , H04Q11/0005 , G02F2201/305 , H04Q2011/0018
Abstract: In a wavelength selective switch, an input port transmits an input beam, and diffraction grating disperses the input beam into optical channels. A liquid-crystal-on-silicon (LCoS) switch assembly has a phase grating profile and has addressable pixels, which are liquid crystal based. The LCoS switch assembly can selectively direct first-order diffracted beams of the optical channels for output to selected output ports. A tunable optical wedge adjacent the LCoS switch assembly can direct higher-order diffraction beams in the space between the output ports to reduce crosstalk. The wedge is a liquid crystal cell having spaced-apart resistive layers and having liquid crystal material disposed between the layers. In the wedge, the liquid crystal material can produce a phase profile in response to bias voltages applied to the resistive layers, and a beam steering angle of the phase profile can direct at least the second-order diffracted beams towards the port spacing between the ports.
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公开(公告)号：US20220357630A1
公开(公告)日：2022-11-10
申请号：US17847712
申请日：2022-06-23
Applicant: II-VI Delaware, Inc.
Inventor： Qingyu Li , Jack R. Kelly , Guomin Jiang , Haiji J. Yuan , Yimin Ji , Helen Chen
IPC: G02F1/29
Abstract: A voltage-controlled optical wedge is formed by creating an adjustable voltage gradient along the length of a relatively large-sized LC cell. A pair of bias voltages (AC voltages) are applied at the opposing side terminations of the LC cell, their RMS values selected to create a continuous phase variation along the length of the cell, where a defined phase variation is associated with a specific beam steering angle. Adjustments in the applied bias voltages (specifically, changes in the RMS values of the bias voltages) result in changing the beam steering angle, providing for active, controllable beam steering as a function of time. The LC cell may be configured to provide either a linear or nonlinear continuous phase variation, as preferred for different beam steering applications.
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公开(公告)号：US11422429B1
公开(公告)日：2022-08-23
申请号：US17236009
申请日：2021-04-21
Applicant: II-VI Delaware, Inc.
Inventor： Qingyu Li , Jack R. Kelly , Guomin Jiang , Haiji J. Yuan , Yimin Ji , Helen Chen
Abstract: A voltage-controlled optical wedge is formed by creating an adjustable voltage gradient along the length of a relatively large-sized LC cell. A pair of bias voltages (AC voltages) are applied at the opposing side terminations of the LC cell, their RMS values selected to create a continuous phase variation along the length of the cell, where a defined phase variation is associated with a specific beam steering angle. Adjustments in the applied bias voltages (specifically, changes in the RMS values of the bias voltages) result in changing the beam steering angle, providing for active, controllable beam steering as a function of time. The LC cell may be configured to provide either a linear or nonlinear continuous phase variation, as preferred for different beam steering applications.
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Patent Agency Ranking
公开(公告)号：US11789331B2
公开(公告)日：2023-10-17
申请号：US17847712
申请日：2022-06-23
Applicant: II-VI Delaware, Inc.
Inventor： Qingyu Li , Jack R. Kelly , Guomin Jiang , Haiji J. Yuan , Yimin Ji , Helen Chen
CPC classification number: G02F1/29 , G01S7/4817
Abstract: A voltage-controlled optical wedge is formed by creating an adjustable voltage gradient along the length of a relatively large-sized LC cell. A pair of bias voltages (AC voltages) are applied at the opposing side terminations of the LC cell, their RMS values selected to create a continuous phase variation along the length of the cell, where a defined phase variation is associated with a specific beam steering angle. Adjustments in the applied bias voltages (specifically, changes in the RMS values of the bias voltages) result in changing the beam steering angle, providing for active, controllable beam steering as a function of time. The LC cell may be configured to provide either a linear or nonlinear continuous phase variation, as preferred for different beam steering applications.
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公开(公告)号：US11016441B2
公开(公告)日：2021-05-25
申请号：US16278351
申请日：2019-02-18
Applicant: II-VI Delaware, Inc.
Inventor： Kun Gao , Jack R. Kelly , Helen Chen , Guomin Jiang , Xinran Wang , Lixin (Lawrence) Wang , Qingyu (Tom) Li , Haiji J. Yuan
Abstract: A two-step optimization process is utilized to define an optimal phase profile for a LCoS spatial light modulator. The two-step optimization process first utilizes a nonlinear constrained optimization (NCO) program to determine the specific parameters required to obtain an optimal phase profile (hologram), where the “optimal phase profile” is typically defined as that profile which achieves maximum diffraction efficiency for optical switching. Following this first step, phase scaling (and perhaps an adjustment in the number of pixels per period) is employed to slightly modify the values of the optimal phase profile to effectively suppress crosstalk peaks. If any orders still exhibit an unacceptable level of crosstalk, these orders are then subtracted from the phase profile to create the final design.
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公开(公告)号：US11906823B2
公开(公告)日：2024-02-20
申请号：US17235168
申请日：2021-04-20
Applicant: II-VI Delaware, Inc.
Inventor： Guomin Jiang , Helen Chen , Haiji J. Yuan , Lixin Wang , WenYi Cao , Xuewen Lu , Qingyu Li , Yimin Ji
CPC classification number: G02F1/0136 , G02F1/13306 , G02F2201/18 , G02F2203/055
Abstract: A reconfigurable polarization rotator is formed of an array of very small liquid crystal (LC) cells (e.g., cells of less than 10 μm in width, termed “microcells”), referred to hereinafter as “microcells”. Each LC microcell is addressable by a separate electrical voltage input that independently controls the polarization rotation performed by the associated LC microcell. By defining a set of adjacent microcells to be held at the same voltage level, that group may be used to form a polarization rotator window of a proper size for a first fiber array configuration. When a fiber array of a different configuration (say, an array with twice the pitch) is used, a different-sized group of adjacent LC microcells is held at a common voltage level so as to form a reconfigured “window” of a new dimension.
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公开(公告)号：US20220334416A1
公开(公告)日：2022-10-20
申请号：US17235168
申请日：2021-04-20
Applicant: II-VI Delaware, Inc.
Inventor： Guomin Jiang , Helen Chen , Haiji J. Yuan , Lixin Wang , WenYi Cao , Xuewen Lu , Qingyu Li , Yimin Ji
Abstract: A reconfigurable polarization rotator is formed of an array of very small liquid crystal (LC) cells (e.g., cells of less than 10 μm in width, termed “microcells”), referred to hereinafter as “microcells”. Each LC microcell is addressable by a separate electrical voltage input that independently controls the polarization rotation performed by the associated LC microcell. By defining a set of adjacent microcells to be held at the same voltage level, that group may be used to form a polarization rotator window of a proper size for a first fiber array configuration. When a fiber array of a different configuration (say, an array with twice the pitch) is used, a different-sized group of adjacent LC microcells is held at a common voltage level so as to form a reconfigured “window” of a new dimension.
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8.发明申请公开(公告)号：US20200264558A1
公开(公告)日：2020-08-20
申请号：US16278351
申请日：2019-02-18
Applicant: II-VI Delaware, Inc.
Inventor： Kun Gao , Jack R. Kelly , Helen Chen , Guomin Jiang , Xinran Wang , Lixin (Lawrence) Wang , Qingyu (Tom) Li , Haiji J. Yuan
Abstract: A two-step optimization process is utilized to define an optimal phase profile for a LCoS spatial light modulator. The two-step optimization process first utilizes a nonlinear constrained optimization (NCO) program to determine the specific parameters required to obtain an optimal phase profile (hologram), where the “optimal phase profile” is typically defined as that profile which achieves maximum diffraction efficiency for optical switching. Following this first step, phase scaling (and perhaps an adjustment in the number of pixels per period) is employed to slightly modify the values of the optimal phase profile to effectively suppress crosstalk peaks. If any orders still exhibit an unacceptable level of crosstalk, these orders are then subtracted from the phase profile to create the final design.
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