Methods and apparatus for beam shaping in optical wireless...

Details Methods and apparatus for beam shaping in optical wireless... Methods and apparatus for beam shaping in optical wireless...

2005-06-21

2005-06-21

Chan, Jason (Department: 2633)

Optical communications

Transmitter

Including specific optical elements

C398S118000

Reexamination Certificate

active

06909854

ABSTRACT:
An optical wireless communications system (1) comprises a server or transceiver hub (6) transmitting and/or receiving optical communications with geographically dispersed subscriber units (8) via optical beams. The transceiver hub (6) transmits a beam pattern that has an efficient, rectangular, flat-topped far field optical profile, thus permitting less complex and less expensive transceiver equipment to be employed in the transceiver hub (6) and in the subscriber units (8). In one embodiment, the transceiver hub (6) comprises an optical source (52, FIG.3), an asymmetrical lens such as a cylindrical lens (60, FIG.3), and a diffraction element such as a diffractive phase plate (65, FIG.3). Various methods of shaping an optical transmission profile are also described.

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