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Optical isolator

A technology of optical isolator and phase shifter, applied in optics, optical components, nonlinear optics, etc., can solve problems such as poor performance

Pending Publication Date: 2022-03-11
ROCKLEY PHOTONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These many 90 degree phase rotators are considered impractical due to manufacturing tolerances and can lead to poor performance

Method used

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  • Optical isolator
  • Optical isolator

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Embodiment Construction

[0044] The present invention encompasses the configuration of a silicon method and a surrounding photon integrated circuit.

[0045] See here figure 1 and figure 2 To describe the two configurations of the Faram Taround.

[0046] Including figure 1 In the first flap melter 110 shown in the optical isolator 100, the silicon spiral delay line 114 is placed between the two U-shaped magnets 112a and 112b (or other magnet arrangement of similar field 116). This configuration only needs to perform 180 degrees of phase rotation (or two 90 degrees rotation) in the middle of the spiral, so that the Faram is constructed. This greatly simplifies the design, and the production error of a single rotating element in the center is not limited. The Faraday rotator 110 is rotated in a non-inter-optical direction (i.e., if the light is passed through the rotator in the opposite direction, the rotation does not reverse) 45 ° rotation of the signal's polarization. The magnetic field strength of the m...

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Abstract

An optical isolator on a silicon photonic integrated circuit. The optical isolator includes: a polarization beam splitter; a polarization rotator; and a Faraday rotator. The Faraday rotator includes: one or more magnets providing a magnetic field; and a silicon spiral delay line. The silicon spiral delay line is formed of a silicon waveguide shaped into a spiral region without a built-in phase shifter and a central region within the spiral region. The central region has a total of no more than 180 degrees of phase shifters.

Description

Technical field [0001] The present invention relates to an optical isolator and a Faraday rotator. Background technique [0002] Optical isolators are typically required in systems with strong back reflections on the laser and cannot use anti-reflective lasers. [0003] The isolator is typically made of a birefringent material, a polarizing film, and a combination of magnetosaple materials. [0004] The integration of these materials and silicon photon devices is still a prominent challenge. [0005] The silicon itself has a small martic puller similar to the magneto-optical material. [0006] This requires minimal TE / TM modal birefringence and can only be implemented in large (3 UM) waveguide platforms. [0007] Silicon isolators are generally considered to include the following components: [0008] Polarization beam splitter [0009] Polarization rotator - for example, this can be in the form of a 45-degree rotator (ie, unlared-rotating) [0010] Faraday rotator -, for exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/09
CPCG02F1/093G02F2202/103G02B6/125G02B6/126G02B27/28G02F1/095G02F1/0955G02F1/0136
Inventor A·斯科菲尔德G·伯德A·J·齐尔基
Owner ROCKLEY PHOTONICS INC