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About Keystone Photonics GmbH Offering reliable and industry-proven fabrication services of validated photonic components using additive microfabrication. Application Areas: - photonic test & measurement - optical communication - free space communication - research & novel devices - quantum communication. Operational since 2017, since 2023 as Keystone Photonics. About Keystone Photonics Offering reliable and industry-proven fabrication services of validated photonic components using additive microfabrication. Application Areas: - photonic test & measurement - optical communication - free space communication - research & novel devices - quantum communication. Operational since 2017, since 2023 as Keystone Photonics. Keystone provides advanced optical probe heads enabling wafer-level testing of photonic devices for co-packaged optics (CPO) and high-speed telecommunications.