Jonathan D Roth

US Patent:

7532379, May 12, 2009

Filed:

Sep 19, 2006

Appl. No.:

11/524498

Inventors:

David A. B. Miller - Stanford CA, US
Jonathan E. Roth - Stanford CA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

G02F 1/03
G02F 1/035
G02F 1/295

US Classification:

359245, 359247, 359248, 359261, 359263, 385 2, 385 8

Abstract:

An electro-optic semiconductor device (e. g. , an optical modulator) having side access and beam propagation within the device is provided. Side access for the optical input and/or output facilitates disposition of electronic circuitry and/or heat sinking structures on the top and bottom surfaces of the modulator. Internal beam propagation instead of internal waveguiding advantageously simplifies optical coupling and alignment to the modulator. Interaction length within the device is preferably enhanced by passing through the device active region at a relatively shallow angle. The internally propagating beam is reflected from a reflective face parallel to the device active region. The side faces can be perpendicular or tilted with respect to the reflective face. Tilted side faces are preferably tilted to provide external beam paths parallel to the reflective face. Internal reflection from an angled side face can be employed to provide configurations having one side port and one top or bottom port.

US Patent:

20220264200, Aug 18, 2022

Filed:

May 3, 2022

Appl. No.:

17/735852

Inventors:

- Goleta CA, US
Jonathan Edgar Roth - San Francisco CA, US

International Classification:

H04Q 11/00
G02B 6/35
H04B 10/548
G02F 1/313

Abstract:

Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.

US Patent:

20210278591, Sep 9, 2021

Filed:

May 11, 2021

Appl. No.:

17/317003

Inventors:

- Goleta CA, US
Brian R. Koch - Brisbane CA, US
Jonathan Edgar Roth - San Francisco CA, US
Gregory Alan Fish - Santa Barbara CA, US

International Classification:

G02B 6/12
G02B 6/136

Abstract:

The wavelength response of an arrayed waveguide grating can be tuned, in accordance with various embodiments, using a beam sweeper including one or more heaters to shift a lateral position of light focused by the beam sweeper at an interface of the beam sweeper with an input free propagation region of the arrayed waveguide grating.

US Patent:

20210160596, May 27, 2021

Filed:

Jan 28, 2021

Appl. No.:

17/161104

Inventors:

- Sunnyvale CA, US
Jonathan Edgar Roth - San Francisco CA, US

International Classification:

H04Q 11/00
G02B 6/35
H04B 10/548
G02F 1/313

Abstract:

Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.

US Patent:

20200340860, Oct 29, 2020

Filed:

Jul 13, 2020

Appl. No.:

16/927290

Inventors:

- Goleta CA, US
Jonathan Edgar Roth - San Francisco CA, US
Brandon Buckley - Santa Barbara CA, US

International Classification:

G01J 3/18
G02B 6/12
G02B 6/42
G02B 6/34
G02F 1/025
H01S 5/40
G01J 3/02
G01J 3/10

Abstract:

Described herein are optical sensing devices for photonic integrated circuits (PICs). A PIC may comprise a plurality of waveguides formed in a silicon on insulator (SOI) substrate, and a plurality of heterogeneous lasers, each laser formed from a silicon material of the SOI substrate and to emit an output wavelength comprising an infrared wavelength. Each of these lasers may comprise a resonant cavity included in one of the plurality of waveguides, and a gain material comprising a non-silicon material and adiabatically coupled to the respective waveguide. A light directing element may direct outputs of the plurality of heterogeneous lasers from the PIC towards an object, and one or more detectors may detect light from the plurality of heterogeneous lasers reflected from or transmitted through the object.

US Patent:

20200278496, Sep 3, 2020

Filed:

May 19, 2020

Appl. No.:

16/877968

Inventors:

- Goleta CA, US
Brian R. Koch - Brisbane CA, US
Jonathan Edgar Roth - San Francisco CA, US
Gregory Alan Fish - Santa Barbara CA, US

International Classification:

G02B 6/12
G02B 6/136

Abstract:

The wavelength response of an arrayed waveguide grating can be tuned, in accordance with various embodiments, using a beam sweeper including one or more heaters to shift a lateral position of light focused by the beam sweeper at an interface of the beam sweeper with an input free propagation region of the arrayed waveguide grating.

US Patent:

20200236448, Jul 23, 2020

Filed:

Apr 3, 2020

Appl. No.:

16/839597

Inventors:

- Sunnyvale CA, US
Jonathan Edgar Roth - San Francisco CA, US

International Classification:

H04Q 11/00
G02F 1/313
G02B 6/35
H04B 10/548

Abstract:

Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.

US Patent:

20200185876, Jun 11, 2020

Filed:

Feb 19, 2020

Appl. No.:

16/794990

Inventors:

- Goleta CA, US
Jonathan Edgar Roth - San Francisco CA, US

International Classification:

H01S 3/13
H01S 3/00
H01S 3/137
H01S 3/10
H01S 3/08
H01S 5/0687

Abstract:

An optical system can lock a wavelength of a tunable laser to a specified wavelength of a temperature-insensitive spectral profile of a spectral filter. In some examples, the spectral filter, such as a Fabry-Perot filter, can have a temperature-insensitive peak wavelength and increasing attenuation at wavelengths away from the peak wavelength. The spectral filter can spectrally filter the laser light to form filtered laser light. A detector can detect at least a fraction of the filtered laser light. Circuitry coupled to the detector and the laser can tune the tunable laser to set a signal from the detector to a specified value corresponding to a specified wavelength in the spectral profile, and thereby adjust the selectable wavelength of the tunable laser to match the specified wavelength. In some examples, the optical system can include a polarization rotator, and can use polarization to separate incident light from return light.