Open AccessRIN‐reduced light source for ultra‐low noise interferometric fibre optic gyroscopes
Author(s) -
Hakimi F.,
Moores J.D.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2012.3371
Subject(s) - optics , gyroscope , interferometry , photodetector , noise (video) , relative intensity noise , coherence (philosophical gambling strategy) , physics , broadband , fibre optic gyroscope , optical fiber , photon , optoelectronics , laser , semiconductor laser theory , quantum mechanics , artificial intelligence , computer science , image (mathematics)
Incoherent broadband light sources are used in interferometric fibre optic gyroscopes (IFOGs) to mitigate the deleterious effects of Kerr and polarisation nonreciprocity, and backscattering effects in gyroscopes. However, incoherent broadband sources suffer from excess noise or relative intensity noise (RIN), caused by the beating of different spectral components on the photodetector. Unless RIN noise is suppressed, IFOG performance cannot be improved once light on the photodetector exceeds one photon per coherence time (∼μW's). Demonstrated is a low RIN light source capable of significantly improving angle random walk of an IFOG by 12 dB.