Quantum Fluctuations in the Small Fabry–Perot Interferometer

Spectra of the small Fabry–Perot interferometer (FPI) size order wavelength, with main mode excited by a quantum field from nano–LED or laser, are investigated. The input is detuned FPI only few photons. We formulate convenient model for interacting field, and provide novel explicit expressions photon number fluctuation spectra inside outside FPI, clearly identified contributions classical noise. As result, we found structures quite different fluctuations transmitted reflected fields note asymmetries in spectra. noise colored (or white) outside) which explains differences another calculate second-order time auto–correlation functions field; they oscillate negative under certain conditions. Results will help study, design, manufacture, use elements optical integrated circuits, such as delay lines transistors.