Applied Optoelectronics Filed Patent Infringement Lawsuit Against CIG

February 22, 2024

SUGAR LAND, Texas, Feb. 22, 2024 (GLOBE NEWSWIRE) -- Applied Optoelectronics, Inc. (Nasdaq: AAOI), a leading provider of fiber-optic access network products for the internet datacenter, cable broadband, telecom and fiber-to-the-home (FTTH) markets, today announced that it has filed a complaint for patent infringement against Cambridge Industries USA, Inc. (CIG) in the U.S. District Court for the Northern District of California, Case No.: 5:24-cv-01010.

The complaint, filed February 20, 2024, in the U.S. District Court for the Northern District of California, alleges that at least the CIG 100G QSFP28 CWDM4 Module Version 1, the CIG 100G QSFP28 CWDM4 Module Version 2, the CIG 100G LR4 Module, the CIG 400G QSFP-DD DR4 Module, the CIG 400G QSFP-DD FR4 Module, and the CIG 100G QSFP28 PSM4 optical transceiver module infringe one or more of the eight asserted of Applied Optoelectronic, Inc. (AOI) optical transceiver patents.

“This lawsuit against CIG is a necessary step to protect AOI’s intellectual property that has been obtained through research and development, innovation, and investment. AOI will vigorously enforce its IP rights against alleged infringers,” said Dr. Thompson Lin, Applied Optoelectronics, Inc. Founder, President and Chief Executive Officer.

AOI is a leading provider of fiber-optic access network products for the internet datacenter, cable broadband, telecom and fiber-to-the-home (FTTH) markets and has invested significantly in the development of its technology and in building its IP portfolio.

In the complaint, AOI is seeking monetary damages from CIG and a permanent injunction.

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About Applied Optoelectronics, Inc.
Applied Optoelectronics, Inc. (AOI) is a leading developer and manufacturer of advanced optical products, including components, modules and equipment. AOI's products are the building blocks for broadband fiber access networks around the world, where they are used in the internet datacenter, CATV broadband, telecom and FTTH markets. AOI supplies optical networking lasers, components and equipment to tier-1 customers in all four of these markets. In addition to its corporate headquarters, wafer fab and advanced engineering and production facilities in Sugar Land, TX, AOI has engineering and manufacturing facilities in Taipei, Taiwan and Ningbo, China. For additional information, visit

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