Acacia Communications, an optical networking company that boosts bandwidth for cloud and other service providers, Monday filed for an initial public offering — a rarity during a year in which the number of tech companies going public is at its lowest since 2009, the year Acacia launched.

The $125M filing to go public comes during a year when the rise of the Unicorn, private companies with valuations of $1 billion or more, has blown away the tech IPO market. Tech IPOs this year have included those by First Data, Rapid7 and Pure Storage.

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