Lumentum has been granted a patent for an optical subassembly that enables low transmission loss coupling of light from a planar optical waveguide to an optical fiber. The system includes a carrier, optical fiber capillary, focusing optical system, and optical isolator for unidirectional light transmission. GlobalData’s report on Lumentum gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Lumentum, was a key innovation area identified from patents. Lumentum's grant share as of April 2024 was 79%. Grant share is based on the ratio of number of grants to total number of patents.
Optical subassembly for low transmission loss between waveguide and fiber
The granted patent (Publication Number: US11966081B2) discloses an optical system comprising a carrier in the form of a hollow tube, an optical fiber capillary coaxially fixed to the tube, and an optical subassembly for non-reciprocal coupling of light from a planar optical waveguide output to the optical fiber capillary. The optical subassembly includes a focusing optical system with two foci, an optical isolator for unidirectional light transmission, and a light transmitting window supported on the tube's side surface. The system aims to provide low transmission loss for light traveling from the planar optical waveguide output to the optical fiber capillary.
Furthermore, the patent details various aspects of the optical subassembly, including the presence of at least one focusing element in the focusing optical system, the use of a free-space optical isolator, and the positioning of the isolator between the two foci based on the magneto-optic effect. Additionally, the focusing optical system may include a C-lens, a GRIN-lens, or a lensed fiber, and is designed to magnify the mode size of the planar optical waveguide output to enhance coupling efficiency to the optical fiber capillary. These features collectively contribute to the system's effectiveness in facilitating the transmission of light in a specific direction with minimal loss, making it a valuable innovation in the field of optical systems.
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