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Optical edge couplers with controllable mode fields for photonic chips

An optical coupling and optical coupler technology, applied in the field of optical signal transmission, can solve problems such as increased alignment workload, double coupling loss, etc.

Active Publication Date: 2020-02-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This increases the alignment effort and suffers from double coupling loss

Method used

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  • Optical edge couplers with controllable mode fields for photonic chips
  • Optical edge couplers with controllable mode fields for photonic chips
  • Optical edge couplers with controllable mode fields for photonic chips

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Embodiment Construction

[0028] The present invention provides an optical edge coupler and / or optical mode converter in which the size of the optical mode field in the coupler is adjusted to match the mode of the coupled optical fiber, thereby providing efficient optical coupling to control the optical coupling associated with the edge coupler. coupling loss. The coupling loss between the fiber and the PIC chip can be limited and the coupling efficiency improved by controlling the mode field size by using two series inverted cones and index contrast tuning by the chip edge structure. The structure of the present invention can also simplify the packaging process.

[0029] Embodiments of the present invention provide a double inverted pyramid structure covered with an outer cladding material that provides a selected refractive index contrast to provide optical mode size matching with the outer fiber. In more detail, embodiments of the present invention include inverted tapered silicon waveguides fabric...

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Abstract

An optical coupler at an edge (105) of a photonic integrated circuit (PIC) for mode matching a waveguide (130) of the PIC to an external optical fiber (140) is provided. The core (110) of the waveguide (130) terminates before the edge (105) and may include an inverted taper for mode expansion. The waveguide cladding includes an inverted cone and is surrounded by a lower refractive index outer cladding material (125), forming a second waveguide. The cladding (115) and outer cladding cooperate to guide light between the core and the edge (105), while the inverted taper facilitates mode expansion. The outer cladding material (125) is selected to have a refractive index that facilitates mode matching with the optical fiber (140). The couplers can be provided using photolithography. Material (127) under the cladding of the waveguide may be removed by an undercut process and the outer cladding material (125) deposited in place of the material (127).

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Patent Application No. 15 / 388,861, filed December 22, 2016, entitled "Optical Edge Coupler with Controllable Mode Field for Photonic Chips," the entire content of which is adopted by This application is incorporated by reference. technical field [0003] The present invention relates to the field of optical signal transmission, and in particular to an optical coupler for use at the boundary of a photonic chip, for example for coupling an optical fiber to a photonic chip. Background technique [0004] Silicon-on-insulator (SOI) technology is attractive for the realization of photonic integrated circuits (PICs). SOI technology offers high refractive index contrast, can incorporate nanoscale waveguides, and can achieve small device footprints, leading to dense integration of optical and electronic devices on small chips. SOI applications include many active components (such as op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/26
CPCG02B6/1228G02B6/305G02B2006/12097G02B6/14
Inventor 蒋嘉艾瑞克·伯尼尔
Owner HUAWEI TECH CO LTD