US 12,375,185 B2
Network and method for optical communication with polarised light signal
Mark Edgar Bray, Chelmsford (GB); and Andrew James Williams, Chelmsford (GB)
Assigned to BAE SYSTEMS PLC, London (GB)
Appl. No. 17/754,583
Filed by BAE SYSTEMS plc, London (GB)
PCT Filed Sep. 28, 2020, PCT No. PCT/GB2020/052340
§ 371(c)(1), (2) Date Apr. 6, 2022,
PCT Pub. No. WO2021/069864, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 1914603 (GB), filed on Oct. 9, 2019; and application No. 19275101 (EP), filed on Oct. 17, 2019.
Prior Publication US 2023/0344524 A1, Oct. 26, 2023
Int. Cl. H04B 10/80 (2013.01); H04J 14/06 (2006.01)
CPC H04B 10/80 (2013.01) [H04J 14/06 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A network for data communication through a a liquid medium, wherein the network comprises:
a set of one or more transmitters, including a transmitter comprising a light emitting diode (LED) light source configured to emit optical signals, a polariser configured to polarise the optical signals to produce a set of one or more polarised optical signals, and a controller to control the polariser, wherein the transmitter is configured to transmit the set of polarised optical signals through the liquid medium, the set of polarised optical signals including the first polarised optical signal comprising first data of a set of data and a second polarised signal comprising second data of the set of data, the second data being different than the first data, wherein polarisation of the first polarised optical signal and the second polarised optical signal are different, wherein the controller of the transmitter configured to control an alignment of the first and second polarised optical signals, and wherein the liquid medium is sea water; and
a set of one or more receivers, including a receiver comprising a controller, wherein the receiver is configured to receive the first polarised optical signal, and the controller of the receiver is configured to control a dithering angle of the first polarised optical signal according to alignment of the receiver with respect to the first polarised optical signal;
wherein the transmitter is a submersible transmitter and/or wherein the receiver is a submersible receiver; and
wherein the first polarised optical signal is a linearly-polarised optical signal.