BroadLight, a supplier of "gigabit passive optical network" (GPON) semiconductors and software, said it has raised a $12 million fifth round of financing.

The round was led by Benchmark Capital, and included existing investors Azure Capital Partners, Broadcom, Cipio Partners, Delta Ventures, Israel Seed Partners, Motorola Ventures, Star Ventures and Tellabs.

BroadLight, of Mountain View, Calif.,  has raised about $50 million, but it is not yet profitable.

Last year, another PON company, Passave Inc, was bought by PMC-Sierra Inc. for $300 million.