Campbell, Calif. -- AOptix, a Campbell-based developer of technology that uses optics to transform identity verification and wireless communications, said on Thursday it has raised $42 million in its fifth round of funding, increasing its total backing to $123 million. Previous investors Clearstone Venture Partners, DAG Ventures, Kleiner Perkins Caufield & Byers, Northgate Capital and W Capital Partners participated in the round and were joined by a new investor, True Ventures. The proceeds will be used to support product development, sales and marketing as the company prepares to launch several new products. AOptix's founders originally invented adaptive optics technologies to help astronomers see farther into space. The company later worked with DARPA and the U.S. military to develop advanced mobile wireless networks for high speed air-to-ground and air-to-air communications. It now provides tools for identity verification using iris recognition and a range of other biometric techniques for aviation security and immigration control, as well as wireless communications technology.