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Infinera, the Sunnyvale, Calif. fiber-optic equipment company that says its technology is superior to existing offerings, has filed to go public, submitting its registration with the Securities and Exchange Commission to raise about $150 million.

It isn’t profitable, but sales are showing momentum.

It brought in $44.3 million during the quarter ended Dec. 31, compared to just $4.1 million for all of 2005. The company had losses of $89.1 million for last year.

There’s a good summary of Infinera’s plans in Light Reading. The IPO has been anticipated for quite some time.

The company has 605 employees. It has raised $315 million since 2000, with $110 million of that coming in July. The largest shareholders are Advanced Equities Inc. and Kleiner Perkins Caufield & Byers, which with about 6.4 million shares, and a 9.3 percent ownership. Mobius Venture Capital and RWI Ventures own 7.8 and 5 percent, respectively.

Other investors include Accel Partners, Agilent Technologies, Applied Materials, CTC, Cypress Semiconductor, JAFCO Ventures, Juniper Networks, Sprout Group, Sutter Hill Ventures, UTStarcom, Venrock Associates and Worldview Technology Partners.