Cornell team's laser boasts high capacity; device is not the fastest, but advances microwave communications efforts

Article Abstract:

Researchers at Cornell University have developed a high-capacity communications laser that is a major advance in microwave communications technology. The device transmits at 28 billion pulses per second. Earlier in 1991, AT&T Bell Laboratories built a laser that transmits at 350 billion pulses a second, but the Cornell laser uses frequency modulation to achieve a greater data-transmission capabilities. According to Lester Eastman, leader of the team of researchers at Cornell, the laser built there is an example of a 'strained quantum well laser.' There are possible military applications, and the new lasers might be used in advanced data communications systems for future generations of high-speed computers.

Lasers, Cornell University, Laser, Communications protocols, Communications Technology, Scientific Research, Transmission Speed, Microwave Communication, Microwave communications, Eastman, Lester

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Southwestern Bell, Matsushita testing pocket phone made by Japanese firm

Article Abstract:

A cordless pocket telephone made by Matsushita Communication Industrial Co is being tested by Southwestern Bell Corp and Matsushita. The phone, which is currently being marketed under the Panasonic brand name, is seen as a 'personal communications service' or '(PCS)' product. It could work in an office or it could be used like a cellular phone. Japanese companies are increasingly interested in the potential market for pocket phones, especially in the United States. Japanese firms are certain that the market for PCS products over the next decade will be huge. In early 1992 Southwestern Bell may expand the test from St. Louis County, MO, to several business customers in De Peres, MO.

Telephone and telegraph apparatus, Japan, Telephone companies, Wireless LANs, Testing, Telecommunications equipment industry, SBC, Cordless telephones, Regional Bell Operating Companies, Southwestern Bell Corp., Personal communications services, Telephone systems, Matsushita Communication Industrial Company Ltd., Telephone System, Telephone Company, Test Markets, Bell Regional Holding Companies, Wireless Network

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Big cost savings for fiber-optic systems are seen in new way to amplify signals

Article Abstract:

New research in optical signal amplification by Nippon Telegraph and Telephone Corp and Rutgers University researchers could dramatically reduce the cost of future fiber-optic systems. The new technique uses special fluoride glass fibers treated with the rare-earth erbium. According to some researchers the signal strength of a communications laser is increased by 1,000 times using the new amplifiers operating at wavelengths of 1.3 microns, the common wavelength of most fiber optic communication transmissions today. One problem with the results is that the researchers were using a very intense light source to generate the increases, a bulky and expensive titanium sapphire laser.

Nonferrous wiredrawing & insulating, Industrial research, Nippon Telephone and Telegraph Corp., Fiber optics, Optical communications technologies, Rutgers University, Optical communications, Research and Development, Optical Communication

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