Fiber optic companies

FIBERPRO (주식회사 파이버프로) is a manufacturer of fiber optic measurement and sensor devices.

Convergenze is a provider of internet services, voice, energy, and natural gas services.

Advanced Fiber Resources (AFR, 珠海光库科技股份有限公司) is a company that designs and manufactures passive optical components.

EarthLink is an internet services company.

Tele Columbus is a company that provides fiber network operations and management services.

Camusat Holding is a company that specializes in implementation of telecom infrastructures and network development.

CityFibre is a provider of wholesale fiber network infrastructure and the builder of Gigabit Cities.

Compel Electronics (also known as КОМПЭЛ) is a company that manufactures electronic equipment.

Harju Elekter manufactures and sells electrical distribution systems and control panels.

SEMI (Sociedad Española de Montajes Industriales) is a company that provides engineering, procurement, and construction services.

Red Electrica Corporacion is engaged in the energy sector and focuses on the management of the high-voltage transmission grid, development, maintenance and improvement of the network’s installations.

QSIL is a producer of fused quartz products.