Point-to-multipoint wide area telecommunications network via atm

Details Point-to-multipoint wide area telecommunications network via atm Point-to-multipoint wide area telecommunications network via atm

1996-03-29

1998-07-28

Negash, Knife-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, 359118, 359125, H04B 1000

Patent

active

057869235

ABSTRACT:
A point-to-multipoint bi-directional wide area telecommunications network employing atmospheric optical communication. The network comprises a primary transceiver unit, a plurality of subscriber transceiver units and an optical router. The primary transceiver unit generates a first light beam on which it modulates first data. The primary transceiver unit atmospherically transmits the first light beam to the optical router which demodulates the first data, modulates the first data on a second light beam and transmits the second light beam to the plurality of subscriber transceiver units in multiplexed manner. The subscriber transceiver units receive the second light beam and demodulate the first data from the second light beam. Conversely, the subscriber transceiver units atmospherically transmit a third light beam on which they modulate second data to the optical router which demodulates the second data, modulates the second data on a fourth light beam and transmits the fourth light beam to the primary transceiver unit. The primary transceiver unit atmospherically receives the fourth light beam and demodulates the respective second data from the fourth light beam. The optical router of the network comprises a secondary transceiver unit, a plurality of transceiver modules and an electronic router for routing data between the secondary transceiver unit and the plurality of transceiver modules to establish communication channels between the primary transceiver unit and the plurality of subscriber transceiver units. The secondary transceiver unit communicates with the primary transceiver unit and the transceiver modules communicate with the subscriber transceiver units. The transceiver modules comprise an X-Y beam deflector for deflecting the second and third light beams to a portion of the subscriber transceiver units in a time-multiplexed fashion. In an alternate embodiment of the optical router, the first light beam is redirected to the subscriber transceiver units and the third light beam is redirected to the primary transceiver unit by a mirror and lens set assembly rather than being demodulated and modulated in the router. Applications such as telephony, the Internet, teleconferencing, radio broadcast, HDTV, interactive TV, and other television forms are contemplated for employment on the network.

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