Polarizing the Data Center: Spin Lasers Deliver 240 Gigabits Per Second 

Next-generation, low-power optical data transmission may rely on polarization rather than switching laser pulses on and off.  A new form of high-speed data transfer encodes laser light according to the oscillating polarization in the light beam, rather than its intensity. The polarization-based data transfer method can achieve 240 gigabits per second but generates only about 7 percent as much heat as a traditional connection running at 25 gigabits per second.

Berkeley Engineers build World’s Fastest Optical Switch Arrays

Engineers at the University of California, Berkeley have built a new photonic switch that can control the direction of light passing through optical fibers faster and more efficiently than ever. The photonic switch is built with more than 50,000 microscopic “light switches,” each of which directs one of 240 tiny beams of light to either make a right turn when the switch is on, or to pass straight through when the switch is off. The 240-by-240 array of switches is etched into a silicon wafer and covers an area only slightly larger than a postage stamp.