公开(公告)号：US11762159B2

公开(公告)日：2023-09-19

申请号：US17302854

申请日：2021-05-13

Applicant: Cisco Technology, Inc.

Inventor： Prakash B. Gothoskar ,  Vipulkumar K. Patel ,  Soha Namnabat ,  Ravi S. Tummidi

IPC: G02B6/12 ,  G02B6/30 ,  G02B6/42 ,  H01L31/0232 ,  H01L31/0352 ,  H01L31/105 ,  G02B6/122

CPC classification number: G02B6/4298 ,  G02B6/12004 ,  G02B6/305 ,  G02B6/4203 ,  H01L31/02327 ,  H01L31/03529 ,  H01L31/1055 ,  G02B6/1228 ,  G02B2006/12123

Abstract: Embodiments described herein include an apparatus comprising a semiconductor-based photodiode disposed on a semiconductor layer, and an optical waveguide spaced apart from the semiconductor layer and evanescently coupled with a depletion region of the photodiode. The photodiode may be arranged as a vertical photodiode or a lateral photodiode.

公开(公告)号：US11754784B2

公开(公告)日：2023-09-12

申请号：US17447153

申请日：2021-09-08

Applicant: Cisco Technology, Inc.

Inventor： Tao Ling ,  Shiyi Chen ,  Xunyuan Zhang ,  Prakash B. Gothoskar

IPC: G02B6/34 ,  G02B6/122 ,  F21V8/00 ,  G02B6/124

CPC classification number: G02B6/1228 ,  G02B6/0026 ,  G02B6/1223 ,  G02B6/124

Abstract: Embodiments presented in this disclosure generally relate to an optical device having a grating coupler for redirection of optical signals. One embodiment includes a grating coupler. The grating coupler generally includes a waveguide layer, a thickness of a waveguide layer portion of the waveguide layer being tapered, the thickness defining a direction, and a grating layer disposed above the waveguide layer and perpendicular to the direction where at least a grating layer portion of the grating layer overlaps the waveguide layer portion of the waveguide layer along the direction. Some embodiments are directed to grating coupler implemented with material layers above and a reflector layer below a grating layer, facilitating redirection and confinement of light that improves coupling loss and bandwidth. The material layers and reflector layer above and below the grating layer may be implemented with or without the waveguide layer being tapered.

公开(公告)号：US11513375B2

公开(公告)日：2022-11-29

申请号：US16716139

申请日：2019-12-16

Applicant: Cisco Technology, Inc.

Inventor： Ming Gai Stanley Lo ,  Vipulkumar K. Patel ,  Mark A. Webster ,  Prakash B. Gothoskar

IPC: G02F1/01 ,  G02F1/025 ,  G02F1/225 ,  G02B6/12

Abstract: A thermo-optic phase shifter comprises an optical waveguide comprising a P-type region comprising a first contact, an N-type region comprising a second contact, and a waveguide region disposed between the P-type region and the N-type region and having a raised portion. The thermo-optic phase shifter further comprises one or more heating elements. The one or more heating elements include one or more discrete resistive heating elements or the P-type and N-type regions driven as resistive heating elements.

公开(公告)号：US11067765B2

公开(公告)日：2021-07-20

申请号：US16698458

申请日：2019-11-27

Applicant: Cisco Technology, Inc.

Inventor： Prakash B. Gothoskar ,  Vipulkumar K. Patel ,  Soha Namnabat ,  Ravi S. Tummidi

IPC: G02B6/122 ,  G02B6/30 ,  G02B6/42

Abstract: Embodiments described herein include an apparatus comprising a semiconductor-based photodiode disposed on a semiconductor layer, and an optical waveguide spaced apart from the semiconductor layer and evanescently coupled with a depletion region of the photodiode. The photodiode may be arranged as a vertical photodiode or a lateral photodiode.

公开(公告)号：US11022757B1

公开(公告)日：2021-06-01

申请号：US16696957

申请日：2019-11-26

Applicant: Cisco Technology, Inc.

Inventor： Xunyuan Zhang ,  Shiyi Chen ,  Tao Ling ,  Prakash B. Gothoskar

IPC: G02B6/34 ,  G02B6/136 ,  G01M11/00 ,  G02B6/12 ,  G02B1/113

Abstract: Embodiments herein describe a photonic platform where an AR coating is disposed between an optical grating and a semiconductor substrate. In one embodiment, the optical grating is disposed within an insulative layer. A first side of the insulative layer provides an optical interface where an external optical source can transmit an optical signal into, or a receive an optical signal from, the grating. A second, opposite side of the insulative layer contacts the AR coating. When the external optical source transmits light through the first side of the insulative layer, some of the light passes through the grating and reaches the AR coating. The AR coating prevents this light from being reflected back to the grating by the semiconductor layer which can cause interference that varies the coupling efficiency of the grating.

公开(公告)号：US10914892B2

公开(公告)日：2021-02-09

申请号：US16164695

申请日：2018-10-18

Applicant: Cisco Technology, Inc.

Inventor： Igal I. Bayn ,  Vipulkumar Patel ,  Prakash B. Gothoskar ,  Sean P. Anderson

IPC: G02B6/12 ,  H01L31/0232 ,  H01L31/105 ,  G02B6/122 ,  H01L31/028

Abstract: A photonic device can include an optical detector (e.g., a photodetector) coupled to silicon waveguides. Unlike silicon, germanium is an efficient detector at the wavelength of optical signals typically used for data communication. Instead of directly coupling the waveguide to the germanium, in one embodiment, the waveguide extends below the germanium but is spaced sufficiently away from the germanium so that the optical signal is not transferred. Instead, an optical transfer structure (e.g., a tapered waveguide or an optical grating) is disposed between the germanium and the waveguide. The waveguide first transfers the optical signal into the optical transfer structure which then transfers the optical signal into the germanium.