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公开(公告)号：US11944423B2
公开(公告)日：2024-04-02
申请号：US17097421
申请日：2020-11-13
Applicant: California Institute of Technology
Inventor： Saransh Sharma , Mikhail Shapiro , Azita Emami
IPC: A61B5/07 , A61B5/00 , A61B5/05 , G01B7/31 , G01R33/022 , G01R33/385
CPC classification number: A61B5/073 , A61B5/05 , A61B5/076 , A61B5/6861 , G01B7/31 , G01R33/022 , G01R33/385 , A61B2562/0223
Abstract: A method for in-vivo monitoring of a target internal volume of a mammal that includes: (a) placing the target internal volume proximal to a three-dimensional magnetic field generator; (b) generating first, second, and third magnetic field gradients along respective first, second, and third axes that are mutually orthogonal; (c) measuring first, second, and third magnetic fields with a three-dimensional magnetic sensor disposed in an ingestible capsule, the ingestible capsule disposed in the target internal volume; (d) with a controller in electrical communication with the three-dimensional magnetic sensor, generating a magnetic sensor output signal that encodes a measurement of the first, second, and third magnetic fields; (e) broadcasting the magnetic sensor output signal from an antenna disposed in the ingestible capsule, and (f) receiving the magnetic sensor output signal with a receiver. The received magnetic field data can be used to determine the three-dimensional position of the ingestible capsule.
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公开(公告)号：US11296794B2
公开(公告)日：2022-04-05
申请号：US16494675
申请日：2018-03-15
Inventor： Arian Hashemi Talkhooncheh , Azita Emami , Yi Zhang , Aaron Zilkie
Abstract: An optoelectronic device for quadrature-amplitude modulation (QAM) and a method of modulating light according to the same. The device comprising: an input waveguide; two intermediate waveguides, each coupled to the input waveguide via an input coupler; and an output waveguide, coupled to each of the intermediate waveguides via an output coupler; wherein each intermediate waveguide includes a modulating component connected in series with a phase shifting component, and each modulating component is connected to a respective electronic driver, the electronic drivers together being operable to produce a QAM-N modulated output from light entering the device from the input waveguide.
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公开(公告)号：US09263854B2
公开(公告)日：2016-02-16
申请号：US14726406
申请日：2015-05-29
Applicant: California Institute of Technology
Inventor： Mayank Raj , Azita Emami
IPC: H01S3/13 , H01S5/183 , H01S5/06 , H01S5/068 , H01S5/0625
CPC classification number: H01S5/183 , H01S3/13 , H01S3/1305 , H01S3/1306 , H01S5/0014 , H01S5/0035 , H01S5/0427 , H01S5/0604 , H01S5/0617 , H01S5/06213 , H01S5/06255 , H01S5/068 , H01S5/06808 , H01S5/18311
Abstract: Technologies are generally described for implementing non-linear VCSEL equalization. In some examples, a rising edge tap parameter, a falling edge tap parameter, an equalization delay and a bias current may be used to equalize a data signal to be output from a VCSEL. A VCSEL model may be used to derive a VCSEL response to one or more isolated data pulses. The derived response may then be used to determine the rising and falling edge tap parameters and an equalization delay, based on a bias current value for the VCSEL and a data rate associated with the data signal. The data signal may then be adjusted based on the equalization delay and the rising and falling edge tap parameter and sent to the VCSEL for output. At the same time, the VCSEL may be biased with a bias current having the bias current value.
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公开(公告)号：US20210141034A1
公开(公告)日：2021-05-13
申请号：US17097349
申请日：2020-11-13
Applicant: California Institute of Technology
Inventor： Saransh Sharma , Mikhail Shapiro , Azita Emami
IPC: G01R33/022 , G01B7/31 , G01R33/385
Abstract: An apparatus for producing magnetic field gradients includes (a) a first planar electromagnet coil set configured to produce a first magnetic field gradient with respect to a first axis, (b) a second planar electromagnet coil set configured to produce a second magnetic field gradient with respect to a second axis that is orthogonal to the first axis, (c) a third planar electromagnet coil set configured to produce a third magnetic field gradient with respect to a third axis that is orthogonal to the first and second axes, and (d) a controller configured to selectively provide power to the first, second, and/or third electromagnet coil sets to sequentially produce a localization magnetic field gradient with respect to each of the first, second, and third axes, at least a portion of each localization magnetic field gradient having a monotonically-varying magnetic field magnitude along a respective axis.
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公开(公告)号：US10551715B2
公开(公告)日：2020-02-04
申请号：US15162163
申请日：2016-05-23
Applicant: California Institute of Technology
Inventor： Saman Saeedi , Azita Emami
Abstract: An optical signal modulator (modulator) includes, in part, a first multitude of diodes coupled in parallel and disposed along an outer periphery of the optical ring of the modulator, a second multitude of diodes coupled in parallel and disposed along the outer periphery of the optical ring, and a doped region adapted to supply heat to the optical ring. A pair of current sources supply substantially constant currents to the first and second multitude of diodes to generate a pair of electrical signals. The modulator further includes, in part, a control circuit adapted to control the temperature of the optical ring in accordance with the pair electrical signals. To achieve this, the control circuit varies the voltage applied to the doped region to vary the supplied heat. Alternatively, the control circuit applies a voltage to the optical ring to maintain a substantially constant resonant wavelength in the optical ring.
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Patent Agency Ranking
公开(公告)号：US09651803B2
公开(公告)日：2017-05-16
申请号：US15073240
申请日：2016-03-17
Applicant: California Institute of Technology
Inventor： Behrooz Abiri , Saman Saeedi , Seyed Ali Hajimiri , Azita Emami
CPC classification number: G02F1/025 , G02F1/0118 , G02F1/0121 , G02F2202/105 , G02F2203/15
Abstract: An integrated optical modulator includes, in part, a pair of waveguides and an inductor. The first waveguide is adapted to receive an incoming optical signal. The second waveguide includes a portion placed in proximity of the first waveguide so as to enable the incoming optical signal travelling in the first waveguide to couple to the second waveguide. The second waveguide comprises a p-n junction. The inductor has a first terminal coupled to the p-n junction and a second terminal coupled to a contact pad. The second waveguide has a circular shape. The inductor optionally has a spiral shape.
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公开(公告)号：US09219486B2
公开(公告)日：2015-12-22
申请号：US14479269
申请日：2014-09-05
Applicant: California Institute of Technology
Inventor： Mayank Raj , Azita Emami
CPC classification number: H03K3/0315 , H03B27/00 , H03B2201/038 , H03L7/0995 , H03L7/24
Abstract: Technologies are generally described for quadrature-based injection-locking of ring oscillators. In some examples, an external signal may be injected into a ring oscillator. Phase signals may be measured from within the ring oscillator and used to determine a mean quadrature error (MQE) that characterizes the difference in frequency between the external signal and the ring oscillator's natural frequency. A control signal may then be generated from the MQE and used to adjust the ring oscillator natural frequency to reduce the difference between the ring oscillator natural frequency and the external signal.
Abstract translation: 技术通常被描述为用于环形振荡器的正交注入锁定。 在一些示例中，外部信号可以被注入到环形振荡器中。 相位信号可以从环形振荡器内测量，并用于确定表征外部信号和环形振荡器固有频率之间的频率差的均方根误差（MQE）。 然后可以从MQE生成控制信号，并用于调整环形振荡器固有频率以减小环形振荡器固有频率与外部信号之间的差异。
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公开(公告)号：US20150288144A1
公开(公告)日：2015-10-08
申请号：US14726406
申请日：2015-05-29
Applicant: California Institute of Technology
Inventor： Mayank Raj , Azita Emami
IPC: H01S5/183 , H01S5/0625 , H01S5/068 , H01S5/06 , H01S3/13
CPC classification number: H01S5/183 , H01S3/13 , H01S3/1305 , H01S3/1306 , H01S5/0014 , H01S5/0035 , H01S5/0427 , H01S5/0604 , H01S5/0617 , H01S5/06213 , H01S5/06255 , H01S5/068 , H01S5/06808 , H01S5/18311
Abstract: Technologies are generally described for implementing non-linear VCSEL equalization. In some examples, a rising edge tap parameter, a falling edge tap parameter, an equalization delay and a bias current may be used to equalize a data signal to be output from a VCSEL. A VCSEL model may be used to derive a VCSEL response to one or more isolated data pulses. The derived response may then be used to determine the rising and falling edge tap parameters and an equalization delay, based on a bias current value for the VCSEL and a data rate associated with the data signal. The data signal may then be adjusted based on the equalization delay and the rising and falling edge tap parameter and sent to the VCSEL for output. At the same time, the VCSEL may be biased with a bias current having the bias current value.
Abstract translation: 通常描述了用于实现非线性VCSEL均衡的技术。 在一些示例中，可以使用上升沿抽头参数，下降沿抽头参数，均衡延迟和偏置电流来均衡要从VCSEL输出的数据信号。 可以使用VCSEL模型来导出对一个或多个隔离数据脉冲的VCSEL响应。 然后，导出的响应可以用于基于VCSEL的偏置电流值和与数据信号相关联的数据速率来确定上升沿和下降沿抽头参数以及均衡延迟。 然后可以基于均衡延迟和上升沿和下降沿抽头参数来调整数据信号，并将其发送到VCSEL以进行输出。 同时，VCSEL可以偏置具有偏置电流值的偏置电流。
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公开(公告)号：US20230223974A1
公开(公告)日：2023-07-13
申请号：US18151934
申请日：2023-01-09
Applicant: The Boeing Company , California Institute of Technology
Inventor： Jeffrey H. Hunt , Fatemeh Aghlmand , Azita Emami
Abstract: An adaptive receiver comprising a current buffer, an inverter-based transimpedance that receives input from the current buffer, an average current control loop that feeds back from the inverter-based transimpedance to the current buffer, a variable gain circuit that receives input from the inverter-based transimpedance, a differential voltage amplifier that receives input from the variable gain circuit, an automatic gain control loop that feeds back from the differential voltage amplifier to the inverter-based transimpedance and variable gain circuit, and a differential buffer that receives input from the differential voltage amplifier.
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公开(公告)号：US10527871B2
公开(公告)日：2020-01-07
申请号：US15070665
申请日：2016-03-15
Applicant: California Institute of Technology
Inventor： Saman Saeedi , Behrooz Abiri , Azita Emami , Seyed Ali Hajimiri
Abstract: A differential optical modulator includes, in part, a splitter splitting an incoming optical signal into first and second input signals, a first variable coupler generating a first differential output signal in response to the first input signal, and a second variable coupler generating a second differential output signal in response to the second input signal. The first variable coupler includes, in part, first and second couplers and a phase shifter disposed therebetween. The first coupler generates a pair of internal signals in response to the first input signal. The second coupler generates the first differential output signal. The second variable coupler includes, in part, third and fourth couplers and a phase shifter disposed therebetween. The third coupler generates a pair of internal signals in response to the second input signal. The fourth coupler generates the second differential output signal.
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