WIDE SHOULDER, HIGH ORDER MODE FILTER FOR THICK-SILICON WAVEGUIDES

    公开(公告)号:US20190094464A1

    公开(公告)日:2019-03-28

    申请号:US16115104

    申请日:2018-08-28

    Abstract: An optical filter for attenuating higher-order modes in an optical waveguide includes a shoulder slab formed of a first material having a first index of refraction and disposed on a second material having a second index of refraction, the first index of refraction being higher than the second index of refraction. The shoulder slab defines a near end having a first width, an intermediate section, adjacent to the first end section, and a far end section, adjacent to the intermediate section and opposite the first end section along a direction of beam propagation. The optical filter also includes a waveguide ridge, formed of the first material and disposed atop the shoulder slab, that traverses the shoulder slab, and is configured to guide light of a fundamental mode along the direction of beam propagation from the near end section to the far end section.

    Semiconductor layer variation for substrate removal after bonding

    公开(公告)号:US10243314B2

    公开(公告)日:2019-03-26

    申请号:US15268951

    申请日:2016-09-19

    Inventor: John Y. Spann

    Abstract: A device for a gain medium for a semiconductor laser has an active region, a buffer layer, a substrate, and an etch stop between the buffer layer and the substrate. The device is bonded to a silicon platform having silicon devices, such as a waveguide and mirror. The substrate is removed, after bonding the device to the platform. The buffer layer is made of different material than the substrate to reduce undercut of the buffer layer during substrate removal compared to a buffer layer made of the same material as the substrate.

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