Measuring sensitivity of optical frequency transfers to acoustic vibrations in photonic networks

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F22%3A00566274" target="_blank" >RIV/68081731:_____/22:00566274 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12502/2663961/Measuring-sensitivity-of-optical-frequency-transfers-to-acoustic-vibrations-in/10.1117/12.2663961.short" target="_blank" >https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12502/2663961/Measuring-sensitivity-of-optical-frequency-transfers-to-acoustic-vibrations-in/10.1117/12.2663961.short</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2663961" target="_blank" >10.1117/12.2663961</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measuring sensitivity of optical frequency transfers to acoustic vibrations in photonic networks

Popis výsledku v původním jazyce

The fiber infrastructure in buildings can pose a security risk. Using interferometric measurement techniques, a fibre installed in a room can be turned into a sensitive microphone and thus misused for eavesdropping. In our contribution we are investigating the transfer of mechanical vibrations to the fiber in the audible frequency band. An installation of optical fiber connecting two buildings of the institute was measured using a heterodyne interferometric system. The phase changes of an ultra-narrow C-band laser working at 1540.5nm wavelength transmitted through the fiber were detected and converted to an audio signal. The power spectral density of the interference phase for audible Fourier frequencies was analyzed over a period of several working and non-working days. A practical example of post-processing the measured data for speech eavesdropping is discussed.

Název v anglickém jazyce

Measuring sensitivity of optical frequency transfers to acoustic vibrations in photonic networks

Popis výsledku anglicky

The fiber infrastructure in buildings can pose a security risk. Using interferometric measurement techniques, a fibre installed in a room can be turned into a sensitive microphone and thus misused for eavesdropping. In our contribution we are investigating the transfer of mechanical vibrations to the fiber in the audible frequency band. An installation of optical fiber connecting two buildings of the institute was measured using a heterodyne interferometric system. The phase changes of an ultra-narrow C-band laser working at 1540.5nm wavelength transmitted through the fiber were detected and converted to an audio signal. The power spectral density of the interference phase for audible Fourier frequencies was analyzed over a period of several working and non-working days. A practical example of post-processing the measured data for speech eavesdropping is discussed.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics

ISBN

978-1-5106-6112-7

ISSN

0277-786X

e-ISSN

1996-756X

Počet stran výsledku

5

Strana od-do

125020I

Název nakladatele

SPIE

Místo vydání

Bellingham

Místo konání akce

Wojanów

Datum konání akce

5. 9. 2022

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000920988700017