US 12,248,011 B2
Electromagnetic field receiver
Fraser Burton, London (GB); Marco Menchetti, London (GB); Liam Bussey, London (GB); and Amelia Winterburn, London (GB)
Assigned to British Telecommunications Public Limited Company, (GB)
Appl. No. 18/554,534
Filed by BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London (GB)
PCT Filed Mar. 4, 2022, PCT No. PCT/EP2022/055580
§ 371(c)(1), (2) Date Oct. 9, 2023,
PCT Pub. No. WO2022/214252, PCT Pub. Date Oct. 13, 2022.
Claims priority of application No. 2105096 (GB), filed on Apr. 9, 2021.
Prior Publication US 2024/0094275 A1, Mar. 21, 2024
Int. Cl. G01R 29/08 (2006.01)
CPC G01R 29/0885 (2013.01) 9 Claims
OG exemplary drawing
 
1. A method of operating an electromagnetic field detector in a wireless telecommunications network, the electromagnetic field detector including a first optical transmitter, a second optical transmitter, and a transmission medium, wherein the first optical transmitter is configured to transmit a probe signal at a probe frequency and the second optical transmitter is configured to transmit a coupling signal 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 such that an incident electromagnetic field at the transmission medium causes a detectable change in the probe signal, the method comprising:
transmitting the probe signal and the coupling signal within a plurality of interaction regions of the transmission medium such that each interaction region of the plurality of interaction regions switches between a first condition and a second condition, in which:
in the first condition of each interaction region, the probe signal and the coupling signal are transmitted within the respective interaction region,
the second condition of each interaction region exists for a time period for which an effect of the coupling signal on the electrons of the transmission medium persists after a switch from the first condition to the second condition, and
an intensity of the coupling signal is such that:
Ωc2<Γ1Γ2
in which Ωc is a Rabi frequency of the coupling signal, Γ1 is a transition rate out of the first excited state of the transmission medium, and Γ2 is a transition rate out of the predetermined excited state of the transmission medium.