Optical communications – Optical communication over freee space – Transmitter and receiver
Reexamination Certificate
2006-04-25
2006-04-25
Bello, Agustin (Department: 2633)
Optical communications
Optical communication over freee space
Transmitter and receiver
C378S118000, C378S170000, C378S169000
Reexamination Certificate
active
07035546
ABSTRACT:
An optical communication transmitter (13), receiver (15), and transceiver (17) having distinctive retro-reflective elements (30) and/or reflectivity that can be modulated. In one embodiment, the retro-reflective elements (30) can have different shapes or patterns (32), irrespective of rotation or size. In another embodiment, the retro-reflective elements can have their reflectivity modulated (42) to have a distinctive pattern in time. The solution also provides the capability to direct a remote optical receiver (15) to an available port (17) with an appropriate FOV. In the case where retro-reflective elements are only shape distinctive, a method may be used to direct the remote OWLink (15) to an appropriate port (17) of the hub (54). In addition to the hub ports (17) used for data links, additional hub ports called command ports (60) are added that are only used during the initial link setup of remote units. The hub (54) contains enough command ports (60) such that one command port covers each possible FOV. All command ports contain the same retro-reflective element shape that is very distinct from other hub shapes, e.g. the largest.
REFERENCES:
patent: 4731879 (1988-03-01), Sepp et al.
patent: 6233088 (2001-05-01), Roberson et al.
patent: 6624916 (2003-09-01), Green et al.
patent: 2004/0046736 (2004-03-01), Pryor et al.
Keller Robert C.
Melendez Jose Luis
Bello Agustin
Brady III W. James
Curs Nathan
Kempler William B.
Telecky , Jr. Frederick J.
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