OpVista, a Milpitas, Calif. company that lets cable providers boost the transmission of data over optical networks, has raised $15 million more in financing.

This is a bubble-era company. It launched in 2000, and suffered amid the downturn in the telecommunications market in late 2000. It has since been restructured, and investors keep pumping in money.

Here is the company’s announcement.

The latest round comes from existing investor ComVentures, a firm that has struggled lately after making mostly communications investments. OpVista’s total funding to date is $90 million.

In a statement, Karl May, President and Chief Executive Officer of OpVista, said: “Based on OpVista’s strong 2006 performance, the company remains on track to achieve profitability by the end of this year, and return another year of triple digit growth in 2007.”

The company sees hope in helping deliver high-bandwidth Ethernet services, such as high definition video.