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GRT(Beijing Guangruntong Technology Development Co., Ltd.) is headquartered in Beijing Zhongguancun Hi-Tech Park and began in April 2008. GRT has gathered a group of senior R&D personnel with an average age of more than 15 years. Under the background of the rapid development of the optical fiber industry and the optical fiber to households, GRT has always adhered to the strategic principles of quality and innovation, and has gradually grown into a high-tech fiber optic company that is currently well-known in China, which integrates R&D, production and marketing, and has its own intellectual property and its own brand.
The main products of GRT are Optical Fiber Network Cards, Optical Fiber Modules, WDM devices, Optical Converter, Optical Fiber Patch Cord, and Optical Splitter. All kinds of products have passed international certification such as FCC, CE, and ROHS, as well as national industry certification, and have won a number of scientific and technological progress awards and excellent product awards. On the road ahead, GRT is committed to building China's own national enterprises, achieving the goals of "Optics Links The World, Connects Us Togetcher".

SIOS Meßtechnik GmbH specializes in the development and manufacture of high-precision measurement instruments. The company was founded in 1991 by Professor Jäger and employees of the Institute of Process Measurement and Sensor Technology at the Technical University of Ilmenau.
From the beginning there was a close scientific and technical cooperation between the SIOS Meßtechnik GmbH and the institute. That formed the basis for the development and manufacture of innovative products of the precision measurement technology, especially in the field of laser interferometry. Today, the cooperation between the Institute for Process Measurement and Sensor Technology and SIOS is continued for the benefit of both partners.
Scientific relationships exist with many other partners from academia and institutional areas. The cooperation with the Physikalisch-Technische Bundesanstalt (PTB) is especially appreciable.
The SIOS company started in the “Technologie- und Gründerzentrum Ilmenau” (translation: centre of technology and formation) and moved in 1993 into the own building in the business park “Am Vogelherd”.
The company is still located in this park, although the building has been expanded several times over recent years.
The company’s proximity and links to the Technical University of Ilmenau and its presence in the Technology Region Ilmenau provides solid background for our business and ensures successful future technological advances.
From the beginning the SIOS Meßtechnik GmbH has reinvested a substantial part of it´s revenue into research and development. Enabling the regular creation of new and innovative products for the market.
Today SIOS Meßtechnik GmbH is a global player. Our representations are situated in nearly 25 of the most important industrial nations and aproximatley 50% of our sales is generated overseas.
Additionally, we are proud winners of several company awards and individual colleagues have received various honours over the years, highlighting our achievements in innovation and business by our industrial and academic peers.

3-EDGE is one of the leading trading companies specialized on
high-end telecommunication test solutions and installation accessories
from various manufacturers. Furthermore the product portfolio covers
automated production systems for micro optics and photonics environment.