US 12,267,103 B2
Electromagnetic field receiver
Fraser Burton, London (GB); and Liam Bussey, London (GB)
Assigned to British Telecommunications Public Limited Company, (GB)
Appl. No. 18/005,318
Filed by BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London (GB)
PCT Filed Jun. 10, 2021, PCT No. PCT/EP2021/065655
§ 371(c)(1), (2) Date Jan. 12, 2023,
PCT Pub. No. WO2022/017679, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 2010995 (GB), filed on Jul. 16, 2020.
Prior Publication US 2023/0261743 A1, Aug. 17, 2023
Int. Cl. H04B 10/073 (2013.01); G01R 29/08 (2006.01); H04B 1/16 (2006.01)
CPC H04B 10/073 (2013.01) [G01R 29/0885 (2013.01); H04B 1/16 (2013.01); H04B 2210/006 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of controlling an electromagnetic field detector comprising a first optical transmitter and a second optical transmitter, a transmission medium, and an optical receiver, wherein the first optical transmitter is configured to transmit a probe signal to the optical receiver via the transmission medium at a probe frequency and the second transmitter is configured to transmit a coupling signal via the transmission medium at a coupling frequency, wherein the probe frequency is set to excite electrons of the transmission medium from a ground state to a first excited state and the coupling frequency is set to excite electrons of the transmission medium to a predetermined excited state so as to induce an Electromagnetic Induced Transparency (EIT) effect in the electromagnetic field detector such that an incident electromagnetic field at the transmission medium causes a detectable change in power of the probe signal at the optical receiver, the method comprising:
varying one or both of an intensity value and the coupling frequency of the coupling signal so as to cause a variation in the change in power of the probe signal at the optical receiver due to the incident electromagnetic field at the transmission medium;
monitoring the variation in the change in power of the probe signal due to the incident electromagnetic field at the transmission medium; and
based on the monitoring of the variation in the change in power of the probe signal, setting at least one of the intensity value or the coupling frequency of the coupling signal so as to increase the change in power of the probe signal.