Waveguide with coherent interference mitigation

US10942378B2 · kind B2 · utility

Assignee

• Facebook Technologies, LLC · US

Inventors

• Andrew Maimone · Duvall, US
• Andrew John Ouderkirk · Kirkland, US
• Hee Yoon Lee · Bellevue, US
• Ningfeng Huang · Redmond, US
• Maxwell Parsons · Seattle, US
• Scott Charles McEldowney · Redmond, US
• Babak Amirsolaimani · Redmond, US
• Pasi Saarikko · Kirkland, US
• Wanli Chi · Rochester, US
• Giuseppe Calafiore · Redmond, US
• Alexander Koshelev · Redmond, US
• Barry D. Silverstein · Menlo Park, US
• Lu Lu · Kirkland, US
• Wai Sze Tiffany Lam · Bothell, US
• Gang Li · Dongguan, CN
• Stephan Lutgen · Regensburg, DE
• Francois Olivier · Cork, IE
• David Massoubre · Cork, IE

Key dates

• Filing date: Jun 2, 2020
• Grant date: Mar 9, 2021
• Expiry date: Jun 2, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F2201/305
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A pupil-replicating waveguide suitable for operation with a coherent light source is disclosed. A waveguide body has opposed surfaces for guiding a beam of image light. An out-coupling element is disposed in an optical path of the beam for out-coupling portions of the beam at a plurality of spaced apart locations along the optical path. Electrodes are coupled to at least a portion of the waveguide body for modulating an optical path length of the optical path of the beam to create time-varying phase delays between the portions of the beam out-coupled by the out-coupling element.