Optical isolator
AssigneeRockley Photonics Limited
InventorsAdam Scofield, Gerald Byrd, Aaron John Zilkie
Life of this patent
Estimating the term…
Abstract
An optical isolator on a silicon photonic integrated circuit. The optical isolator comprising: a polarization splitter; a polarization rotator; and a Faraday rotator. The Faraday rotator comprises: one or more magnets providing a magnetic field; and a silicon spiral delay line. The silicon spiral delay line being formed from a silicon waveguide shaped into a spiral region having no built-in phase shifters and a central region within the spiral region. The central region having no more than a total of 180 degree of phase shifters.
Claims20
An optical isolator on a silicon photonic integrated circuit, the optical isolator comprising:
- a polarization splitter;
- a polarization rotator;
- and
- a Faraday rotator,
- wherein the Faraday rotator comprises:
- one or more magnets for providing a magnetic field;
- and
- a silicon spiral delay line, the silicon spiral delay line formed from a silicon waveguide shaped into a spiral region having no built-in phase shifters and a central region within the spiral region, the central region having no more than a total of 180 degrees of phase shifters.
A Faraday rotator for use in a silicon waveguide platform, the Faraday rotator comprising:
- one or more magnets for providing a magnetic field;
- and
- a silicon spiral delay line, the silicon spiral delay line formed from a silicon waveguide shaped into a spiral region having no built-in phase shifters and a central region within the spiral region, the central region having no more than a total of 180 degrees of phase shifters.
Dependencies are inferred from the claim text.