Founded in 1999, GrenTech is a high-tech fiber optic supplier and one of the best transceiver manufacturers specializing in the R&D and production of wireless communication systems, RF products and optical transceiver products. GrenTech has a prominent position in the global sfp module industry, and it is the biggest base station RF device supplier of three out of the four big communication equipment manufacturers in the world, namely Ericsson, ZTE and Nokia.