Contact us

State Development Corporation of Thuringia (LEG Thüringen)

Dept. Investment, International Business and Cluster Promotion

Mainzerhofstraße 12
99084 Erfurt
Phone: +49 (0) 361 5603-450
Fax: +49 (0) 361 5603-328
write an email

WEINERT Fiber Optics GmbH

  • Internet:
  • Legal representative: Herr Dipl.-Phys. Andreas Weinert (Geschäftsführer), Herr Marcus Bloom-Pflug (Geschäftsführer)
  • Contact: Herr Marcus Bloom-Pflug (Geschäftsführer)
  • Employees (Thuringia): 150

Location information

  • Location:
    Mittlere-Motsch-Str. 26
    D-96515 Sonneberg
  • District:


- Development, production and distribution of high purity quartz glass, preforms and rods as well as optical fibres, cables, assemblies and special components.


- Quartz glass, preforms and fibres drawn from them - Fibre optic cables, complete fibre optic systems with self-developed optical components


- micro-mechanical machining of components (e.g. plugs)

R&D focus:

- hybrid coatings for optical fibres; fibre-optical switches; fibre-optical branching devices; optical fibres for micro-reactors

Further information:

- Operating under the name LEONI Fiber Optics GmbH until May 2022. - Headquarters relocated from Föritztal OT Neuhaus-Schierschnitz to Sonneberg (May 2022). - Technology partner for sectors including cars/commercial vehicles, data communication/networks, home and electrical appliances, electromobility, energy/infrastructure, factory automation, healthcare, optical metrology, machinery/sensor systems, marine, transport.


ISO 9001, ISO 13485, SIO 14001, FDA-Reg.

Subsidy consulting

We will be glad to advise you on available investment subsidies, participations and guarantees.


Individual, competent, non-bureaucratic and flexible.