Abstract
The traditional figure of merit used to characterize the performance of spectrally operated fiber optics multimode interference (MMI) devices, is the wavelength shift of their filter-like response. In this work, we extend the analysis to disclose theoretically their temporal coherence characteristics. By means of a comprehensive modal propagation analysis, we simulated the transmission spectrum of realistic MMI devices with the simplest architecture, singlemode-multimode-singlemode, as a function of the diameter of the multimode fiber and the refractive index of its cladding. The results show that fiber optics MMI devices can be used as versatile light sources whose coherence length can be adjusted over a broad range. When operating at the first and fourth self-image, respectively, the coherence length can be adjusted in the range from 5 µm to 16 µm and from 13 µm to 100 µm, approximately. This opens the possibility to use fiber optics MMI devices as primary light sources in relevant scenarios, for instance, to optimize the longitudinal resolution in low-coherence interferometry setups and to control the scale of the mesoscopic light transport in disordered, scattering systems.
Published Version
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