Nippon Telegraph and Telephone‘s patent involves a planar lightwave circuit with reduced substrate stress, minimizing substrate curvature. The circuit includes a glass film layered on the substrate, input and output waveguides, and grooves between them. GlobalData’s report on Nippon Telegraph and Telephone gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Nippon Telegraph and Telephone, Cloud gaming was a key innovation area identified from patents. Nippon Telegraph and Telephone's grant share as of January 2024 was 25%. Grant share is based on the ratio of number of grants to total number of patents.

Planar lightwave circuit with reduced stress on substrate

Source: United States Patent and Trademark Office (USPTO). Credit: Nippon Telegraph and Telephone Corp

A recently granted patent (Publication Number: US11886004B2) discloses a planar lightwave circuit that involves layering a glass film on a substrate and forming multiple input waveguides along with an output waveguide that is connected to the input waveguides. Additionally, the circuit includes a series of grooves in the central part of the substrate between the input waveguides and the output waveguide.

The patent further details that the grooves are created by removing the glass film and extend all the way to the substrate. Some of these grooves reach the end surfaces on both sides of the substrate. The grooves are organized in lines, forming groups, with multiple groups being formed in the circuit. This innovative design of the planar lightwave circuit aims to enhance the efficiency and performance of optical communication systems by optimizing the transmission of light signals within the circuit.

To know more about GlobalData’s detailed insights on Nippon Telegraph and Telephone, buy the report here.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.