Optical wireless communications
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Abstract
An optical wireless local area network using line of sight optical links. The base station and terminal stations are provided with optical transceivers which include a transmitter array and detector array. The transmitter array consists of an array of resonant cavity light emitting diodes integrated using flip-chip technology with a CMOS driver circuit. The driver circuit includes constant bias, current peaking and charge extraction. The driver circuitry is compact and can be confined within a region underlying the corresponding light source. The detector array consists of an array of photo diodes, provided with sense circuitry consisting of a pre-amplifier and post-amplifier. The diodes and sense circuitry are also integrated using a flip-chip technique. The light emitter and the detector may include adaptive optical elements to steer and/or focus the light beams.
30 Citations
47 Claims
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1-45. -45. (canceled)
- 46. An optical wireless LAN comprising at least one base station and a plurality of terminal stations, the at least one base station comprising an optical transmitter providing a line-of-sight optical downlink to transmit data to a terminal station receiver in each of the plurality of terminal stations, and wherein each of the plurality of terminal stations is provided with a terminal station transmitter providing an uplink for transmitting data to a base station receiver in the at least one base station, said uplink comprising at least one of an undirected optical link and a radio link.
Specification