The blaze was first reported around 6:45 a.m. at JDS Uniphase Corp. at 1405 Thunderbolt Way, according to the Santa Rosa Fire Department.
Employees directed firefighters to the second floor of the building, where flames near exercise equipment had triggered the building's sprinkler system, fire officials said.
The fire was extinguished and the sprinklers were shut down, but there was large amount of water on the second floor that was starting to leak, officials said. In order to prevent damage to the optical equipment on the first floor, tarps were used to cover items during cleanup.
On the second floor, crews used water vacuums and squeegees to remove water. This helped limit water damage to the building and the equipment. The estimated amount of damage is $20,000.
Three engines, two trucks and 19 fire personnel responded to the blaze. The fire is under investigation by the Santa Rosa Fire Department.