澳门金沙网站开户网址

Technology: Z-Laser shines for optical fibres

作者:滕伥鸽    发布时间:2019-02-28 01:14:03    

Optical fibre communications systems, such as those used in telephone networks and internal links in computers, could be made much cheaper by a new type of semiconductor laser. Researchers at AT&T Bell Laboratories in Maryhill, New Jersey, say the zone laser, or Z-laser, is the first that can focus itself. Like lasers in laser printers and compact disc players, the Z-laser generates light from the excitation of electrons in an ‘active’ layer of semiconducting material just below its surface. But almost all other semiconductor lasers on sale today feed the light out of the active layer sideways in a ribbon about a micrometre wide which must then be focused by a lens. Lining this up to an optical fibre makes up to 80 per cent of the cost of setting up an optical link. However, the Z-laser is a surface emitter: its light escapes upwards through the semi-conductor. Grooves can be cut in the upper layer to create interference patterns in the infrared light, focusing it by diffraction to a relatively large spot, 8 micrometres across. This should be much easier to join to an optical fibre,

 

Copyright © 网站地图