US 9,810,849 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. 14/430,839
Filed by BAE SYSTEMS plc, London (GB)
PCT Filed Sep. 24, 2013, PCT No. PCT/GB2013/052491
§ 371(c)(1), (2) Date Mar. 24, 2015,
PCT Pub. No. WO2014/049342, PCT Pub. Date Apr. 3, 2014.
Claims priority of application No. 1217061.9 (GB), filed on Sep. 25, 2012.
Prior Publication US 2015/0215589 A1, Jul. 30, 2015
Int. Cl. G02B 6/36 (2006.01); H04J 14/02 (2006.01); H04B 10/25 (2013.01); H04Q 11/00 (2006.01)
CPC G02B 6/3604 (2013.01) [H04B 10/2504 (2013.01); H04J 14/02 (2013.01); H04Q 11/0005 (2013.01); H04Q 2011/0037 (2013.01)] 17 Claims
OG exemplary drawing
 
16. A method of operating an optical rotating joint, the method comprising:
routing first and second optical signals through an optical rotating joint that is coupled to a rotating structure, such that the rotating structure is arranged to rotate with respect to the optical rotating joint, by:
wavelength division multiplexing the first and second optical signals using a wavelength division multiplexer on the rotating structure coupled to a first side of the optical routing joint;
receiving the wavelength division multiplexed first and second optical signals at a first optical circulator on the rotating structure, the first optical circulator coupled to the first side of the optical rotating joint and directing the received first and second optical signals through the first optical circulator to the first side of the optical rotating joint, the first optical circulator having a first port arranged to output second and third optical signals to, and receive first optical signals from, the first side of the optical rotating joint;
receiving, via a first optical receiver coupled to a first camera sensor, the first optical signals from a second port of the first optical circulator, wherein the first camera sensor is on the rotating structure and is coupled to a second port of the optical circulator;
outputting, via a first optical transmitter coupled to the first camera sensor, the second optical signals to a third port of the first optical circulator;
outputting, via a second optical transmitter coupled to a second camera sensor, third optical signals to a third port of the first optical circulator, wherein the second camera sensor is on the rotating structure and is coupled to the third port of the optical circulator;
further receiving the directed first and second optical signals at a second optical circulator on a second side of the optical rotating joint and outputting the further received first and second optical signals from the optical rotating joint to a wavelength division demultiplexer on the second side of the optical rotating joint; and
wavelength division demultiplexing the outputted first the outputted first and second optical signals using the wavelength division demultiplexer.