October 17, 2011
History and usageIn Ancient China, soldiers stationed along the Great Wall would alert each other of impending enemy attack by signaling from tower to tower. In this way, they were able to transmit a message as far away as 750 kilometres (470 mi) in just a few hours.
October 17, 2011
A Photophone receiver and headset, one half of Bell and Tainter's optical telecommunication system of 1880 .Historical plaque marker on the side of the Franklin School at 13th & K Streets NW in Washington, D.C., marks one of the sites used with Bell's famous invention.The photophone, also known as a radiophone, was invented jointly by Alexander Graham Bell and his then-assistant Charles Sumner Tainter on February 19, 1880, at Bell's 1325 'L' Street laboratory in Washington, D.C.
October 17, 2011
OIDA is a Washington DC-based, non-profit association that promotes optoelectronics. OIDA members include the leading providers of optoelectronic components and systems enabled by optoelectronics, as well as universities and research institutions. OIDA serves as the voice of industry to government and academia, acts as liaison with other industry associations worldwide, and provides a network for the exchange of ideas and information within the optoelectronics community.
October 17, 2011
The speed of light is approximately 186,000 miles per second. Fiber optic networks, which carry laser light information signals, are moving that speed closer to the reach of the average home Web user with services like Verizon FiOS, or Verizon Fiber Optic Service.
October 15, 2011
This article is about the serial digital interface used in professional video. For serial interfaces in general, see serial port.Serial digital interface uses BNC connectorsSerial digital interface (SDI) is a family of video interfaces standardized by SMPTE.
October 15, 2011
Multiple Quantum Well ModulatorsSemiconductor MQW modulators are one of the few technologies that meet all the requirements need for United States Navy applications, and consequently the Naval Research Laboratory is particularly active in developing and promoting that approach. When used as a shutter, MQW technology offers many advantages: it is robust solid state, operates at low voltages (less than 20 mV) and low power, and is capable of very high switching speeds. MQW modulators have been run at Gbit/s data rates in fiber optic applications.