Irvine-based networking chipmaker ClariPhy Communications Inc. has raised $19.7 million in venture funding, according to San Francisco-based market tracker CrunchBase.

Backers included wireless and networking gear maker Nokia Siemens Networks, Norwest Venture Partners, Allegis Capital LLC, ONSET Ventures, Oclaro Inc. and Pacific General Ventures.

Nokia Siemens, the Netherlands-based venture of Germany-based Siemens AG and Nokia Corp. in Finland, has looked to ClariPhy’s chips to help meet growing demand for network capacity spurred by digital TV, smartphones, cloud computing and other uses.

Existing investors that participated in the funding round included Norwest and Allegis, both based in Palo Alto, and San Jose-based Oclaro Inc., which makes electronics for optical networks.

ClariPhy makes chips that allow for the transfer of data at speeds of up to 100 gigabits per second, an emerging market driven by demand for video, music, photos and other data on phones, tablets and other devices.

It also makes chips that handle data at 10 gigabits per second, the current standard.

Both chip versions convert analog signals to digital in optical networks, which use pulses of light to transmit data.

The company was founded in 2002 and has raised nearly $88 million, according to regulatory filings.

Nariman Yousefi, a 17-year veteran of Broadcom Corp. who helped establish the Irvine chipmaker’s networking group, was hired in 2011 to lead ClariPhy.