The Pulse wave generator was a device used on Caius' Tel'tak to temporarily disable other ships that were following him.
A pulse wave generator worked by sending out an omnidirectional pulse wave which caused a spike and overload in the power levels of ships hit by the wave. Although it doesn't cause any permanent damage to the ships, they are disabled for several minutes. For this system to work, all power in the ship using this device must be deactivated.
A pulse wave generator was one of several modifications which Caius made to his Tel'tak. In 2005, the device was used by Vala Mal Doran on two Al'kesh of the Lucian Alliance that were following the cargo ship. While the disabling effect only lasted for a few minutes, it bought SG-1 enough time to escape. (SG1: "The Ties That Bind")