公开(公告)号：JP2000224112A

公开(公告)日：2000-08-11

申请号：JP2000009593

申请日：2000-01-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHARLES CALVIN BYERS ,  HINTERLONG STEPHEN J ,  NOVOTNY ROBERT ALLEN ,  ROBERT E RICHARDSON

IPC: H04B10/11 ,  H04B10/105 ,  H04B10/10 ,  H04B10/20 ,  H04B10/22

Abstract: PROBLEM TO BE SOLVED: To drastically reduce the number of OLSTs arranged on a tower by transmitting a steerably modulated laser beam to each on of plural subscribers in an OLST viewing area and receiving a signal from a customer by means of OLST when being steered by a specified subscriber. SOLUTION: A free space optical wide band access system is constituted of a center hub 300 and elements such as an 'antenna' arranged in the respective subscribers 21-25, 43 and 44, however, a free space optical link and a laser are used in place of microwave radio. Optical beam scanning technique is utilized in the hub in order to rapidly move the beam from a certain user to another and optical number of virtual point-to-point links are formed. The two different wave lengths of an infrared beam are used in the upstream direction and the downstream direction. The hub is arranged at a sufficiently high position to directly view the multiple latent subscriber. Furthermore, the various and different groups of the subscribers are allotted by plural sectors in a configuration.