US 9,810,848 B2
Apparatus and methods for use with optical rotating joint
Christopher Ralph Pescod, Chelmsford (GB); and Mohammed Nawaz, Chelmsford (GB)
Assigned to BAE SYSTEMS plc, London (GB)
Appl. No. 14/430,836
Filed by BAE SYSTEMS plc, London (GB)
PCT Filed Sep. 24, 2013, PCT No. PCT/GB2013/052490
§ 371(c)(1), (2) Date Mar. 24, 2015,
PCT Pub. No. WO2014/049341, PCT Pub. Date Apr. 3, 2014.
Claims priority of application No. 1217062.7 (GB), filed on Sep. 25, 2012.
Prior Publication US 2015/0253509 A1, Sep. 10, 2015
Int. Cl. G02B 6/36 (2006.01); H04J 14/02 (2006.01); H04B 10/032 (2013.01); H04B 10/25 (2013.01)
CPC G02B 6/3604 (2013.01) [H04B 10/032 (2013.01); H04B 10/25 (2013.01); H04J 14/0254 (2013.01)] 16 Claims
OG exemplary drawing
 
15. A method of operating an optical rotating joint, the method comprising:
providing redundancy for camera sensor signals to be passed through the optical rotating joint coupled to a rotating structure such that the rotating structure is arranged to rotate with respect to the optical rotating joint, the redundancy provided by at least one of:
passing first optical signals from the optical rotating joint to a first camera sensor on the rotating structure and a second camera sensor on the rotating structure via a first optical changeover switch on the rotating structure, wherein the first camera sensor is optically coupled to the first optical changeover switch, and the first camera sensor is arranged to receive, via a first optical receiver coupled to the first camera sensor, the first optical signals from the first optical changeover switch; and
passing second optical signals from the first and second camera sensors toward the optical rotating joint via a second optical changeover switch on the rotating structure, wherein the second camera sensor is optically coupled to the first changeover switch, and the second camera sensor is arranged to receive, via a second optical receiver coupled to the second camera sensor, the first optical signals from the second optical changeover switch;
such that one of the first and second camera sensors is active while another of the first and second camera sensors is not active to provide redundancy based on optical switching.