David S Perlmutter

US Patent:

20220337317, Oct 20, 2022

Filed:

Jul 17, 2020

Appl. No.:

17/634522

Inventors:

- Livermore CA, US
Apurva Shantharaj Gowda - Mountain View CA, US
David Simon Perlmutter - Oakland CA, US
Alexander Thomas Wargo - Livermore CA, US
Jason Thomas Chou - Walnut Creek CA, US

International Classification:

H04B 10/2575
H03M 1/60

Abstract:

Devices, methods for analog-to-digital converters (ADCs) that perform high-dynamic range measurements based on optical techniques are disclosed. In one example aspect, an optical encoder includes a polarization rotator configured to receive a train of optical pulses, and an electro-optic (EO) modulator coupled to an output of the polarization rotator. The EO modulator is configured to receive a radio frequency (RF) signal and to produce a phase modulated signal in accordance with the RF signal. The optical encoder also includes a polarizing beam splitter coupled to the output of the EO modulator; and an optical hybrid configured to receive two optical signals from the polarizing beam splitter and to produce four optical outputs that are each phase shifted with respect to one another.

US Patent:

20220231760, Jul 21, 2022

Filed:

Feb 9, 2022

Appl. No.:

17/667999

Inventors:

- Livermore CA, US
Apurva Shantharaj Gowda - Mountain View CA, US
David Simon Perlmutter - Oakland CA, US
Joshua Linne Olson - Manassas VA, US
Jason Thomas Chou - Walnut Creek CA, US

International Classification:

H04B 10/079
H04B 10/2575

Abstract:

Methods, devices and systems for providing accurate measurements of timing errors using optical techniques are described. An example timing measurement device includes an optical hybrid that receives two optical pulse trains and produces two or more phase shifted optical outputs. The timing measurement device further includes two or more optical filters that receive the outputs of the optical hybrid to produce multiple pulse signals with distinctive frequency bands. The device also includes one or more photodetectors and analog-to-digital converters to receive to produce electrical signals in the digital domain corresponding to the optical outputs of the hybrid. A timing error associated with the optical pulse trains can be determined using the electrical signals in digital domain based on a computed phase difference between a first frequency band signal and a second frequency band signal and a computed frequency difference between the first frequency band signal and the second frequency band.

US Patent:

20210044353, Feb 11, 2021

Filed:

Apr 10, 2020

Appl. No.:

16/846143

Inventors:

- Livermore CA, US
David Simon Perlmutter - Oakland CA, US
Peter Thomas Setsuda DeVore - Livermore CA, US
Apurva Shantharaj Gowda - Mountain View CA, US
Jason Thomas Chou - Walnut Creek CA, US

International Classification:

H04B 10/2557
G02F 1/21
H04J 14/02
G02F 1/365
G02F 2/00

Abstract:

Devices, systems and methods for encoding information using optical components are described. Information associated with a first optical signal (e.g., an optical pump) is encoded onto the phase of a second optical signal (e.g., an optical probe) using cross phase modulation (XPM) in a non-linear optical medium. The optical signals are multiplexed together into the nonlinear optical medium. The probe experiences a modified index of refraction as it propagates through the medium and thus accumulates a phase change proportional to the intensity of the pump. The disclosed devices can be incorporated into larger components and systems for various applications such as scientific diagnostics, radar, remote sensing, wireless communications, and quantum computing that can benefit from encoding and generation of low noise, high resolution signals. Examples of the encoded information includes intrinsic noise from the optical source, or others signals of interest, such as electrical, optical, X-ray, or high-energy particle signals.

US Patent:

20210018814, Jan 21, 2021

Filed:

Jan 24, 2020

Appl. No.:

16/751839

Inventors:

- Livermore CA, US
Jacky Chak-Kee Chan - Livermore CA, US
Peter Thomas Setsuda DeVore - Livermore CA, US
David Simon Perlmutter - Oakland CA, US
Jason Thomas Chou - Walnut Creek CA, US

International Classification:

G02F 1/21
H04J 14/08
G02B 5/20
G02F 1/01

Abstract:

Devices, methods and systems for generating wideband, high-fidelity arbitrary radio frequency (RF) passband signals are described. A voltage tunable optical filter for arbitrary RF passband signal generation includes a first input configured to receive a broadband optical pulse train, a second input configured to receive a first control voltage representative of an amplitude signal, an electrooptic modulator to receive the broadband optical pulse train and the first control voltage, to modulate the broadband optical pulse train in accordance with the amplitude signal, and to produce two complementary optical outputs that form two arms of an interferometer, an optical delay component to impart an optical path difference into one of the complementary outputs of the electrooptic modulator, and a combiner or a splitter to receive two complementary optical outputs of the electrooptic modulator after impartation of the optical path difference and to produce an output interference pattern of fringes.

US Patent:

20210021337, Jan 21, 2021

Filed:

Jun 10, 2020

Appl. No.:

16/898218

Inventors:

- Livermore CA, US
Apurva Shantharaj Gowda - Mountain View CA, US
David Simon Perlmutter - Oakland CA, US
Joshua Linne Olson - Manassas VA, US
Jason Thomas Chou - Walnut Creek CA, US

International Classification:

H04B 10/079
H04B 10/2575

Abstract:

Methods, devices and systems for providing accurate measurements of timing errors using optical techniques are described. An example timing measurement device includes an optical hybrid that receives two optical pulse trains and produces two or more phase shifted optical outputs. The timing measurement device further includes two or more optical filters that receive the outputs of the optical hybrid to produce multiple pulse signals with distinctive frequency bands. The device also includes one or more photodetectors and analog-to-digital converters to receive to produce electrical signals in the digital domain corresponding to the optical outputs of the hybrid. A timing error associated with the optical pulse trains can be determined using the electrical signals in digital domain based on a computed phase difference between a first frequency band signal and a second frequency band signal and a computed frequency difference between the first frequency band signal and the second frequency band.

US Patent:

20210021349, Jan 21, 2021

Filed:

May 11, 2020

Appl. No.:

16/872121

Inventors:

- Livermore CA, US
Apurva Shantharaj Gowda - Mountain View CA, US
David Simon Perlmutter - Oakland CA, US
Alexander Thomas Wargo - Livermore CA, US
Jason Thomas Chou - Walnut Creek CA, US

International Classification:

H04B 10/54
H04B 10/25
H04B 10/61
G02B 27/28
G02F 1/313
G02F 1/29

Abstract:

Devices, methods for analog-to-digital converters (ADCs) that perform high-dynamic range measurements based on optical techniques are disclosed. In one example aspect, an optical encoder includes a polarization rotator configured to receive a train of optical pulses, and an electro-optic (EO) modulator coupled to an output of the polarization rotator. The EO modulator is configured to receive a radio frequency (RF) signal and to produce a phase modulated signal in accordance with the RF signal. The optical encoder also includes a polarizing beam splitter coupled to the output of the EO modulator; and an optical hybrid configured to receive two optical signals from the polarizing beam splitter and to produce four optical outputs that are each phase shifted with respect to one another.