US Patent granted to IPG Photonics Corporation (Massachusetts) on July 09 titled as "Multi-stage erbium-doped fiber amplifier with a single programmable logic device control circuit and method of controlling thereof"
United States Patent and Trademark Office has granted patent no. 8,482,850 on July 09, 2013, to IPG Photonics Corporation (Massachusetts), titled as "Multi-stage erbium-doped fiber amplifier with a single programmable logic device control circuit and method of controlling thereof"
Inventors: Simmons; Phil (Sterling, MA)
Assignee: IPG Photonics Corporation (Oxford, MA)
According to the abstract released by the U.S. Patent & Trademark Office: "A control circuit for a fiber amplifier having a first stage pump and at least one second stage pump and method of controlling thereof is disclosed. The control circuit includes a control gate controlling a current through the first stage pump. A sensor for detecting a voltage across the first stage pump and providing a measured output of the voltage is provided. The control circuit further includes a control loop configured for selectively controlling the current through the control gate in accordance with the measured output and a set reference point is also provided."
Good news but nothing seems to stop the selling/shorting of this one. Can't find anything out there that is causing it either. Earnings on the 30th may be a long's only hope left for a reversal of a very sick trend.