Investigation of mode coupling effects on sensitivity and bias of a multimode fiber loop interferometer: Application to an optimal design of a multimode fiber gyroscope

A New Method for Total Fat Detection in Raw Milk Based on Dual Low-Coherence Interferometer

“…According to the previous section, the phase of the reflection spectrum depends on the Fabry–Perot cavity and the OPD. In this work, scatter and refractive index changes were related to the wavelength operation [4,21,22,23,27,28]. As a result, all the R2 regions were analyzed to provide an optimal wavelength operation (see Figure 7).…”

“…The electric field of the modal trajectories into the loop can be described by [27]:ESFL(z)=EOk2z(l↔−truek^truek^)∑n=1N∑m=1Mαn·En·Cnmejfalse(φn+sans-serifαfalse), where Cnm is the coupling coefficient of the modes involved and α is the phase between the modal trajectories into the unbalanced fiber loop. The observation of the interference effect is limited by several factors, such as the large number of modes, short loop length (1.6 m), unbalanced coupling ratio (90:10), and wavelength operation (400–800 nm) [27]. However, when the electric field ESFL(z) arrives to the EFPI by the residual port of coupler 2, one part of the light is transmitted and the rest is reflected to the loop.…”

Influence of parameters of open-loop fiber optic gyro elements on measurement precision

“…В роботах [7,8] наведено рекомендації з вибору оптимальних елементів багатомодового ВОГ. На жаль, аналіз впливу параметрів елементів на точність ВОГ в [7,8] не розглядався; крім того, запропонована схема ВОГ не містить деяких стандартних для інтерферо-метричних ВОГ елементів, наприклад, поляризатора.…”

Co‐simulation‐based modeling and performance analysis of hybrid fiber–wireless links

“…Therefore, this model cannot be extended to the case of highly coherent sources and longer transmission lengths. However, the elimination of the intermodal interferences is closely related to the spectral bandwidth of the light source and the MMF length characteristics.Concerning the validity of this approximation for our case of study, where a relatively small MMF length (300 m for the OM3 fiber) and a light source of a moderate coherence characteristic (Δ λ = 0.5 nm) are used, according to the study presented in , the coherence length of this light source is less than the coherence length of the MMF. Therefore, there are no intermodal interferences, and as a result, under the above conditions, the Gaussian approximation is widely sufficient for the MMF modal dispersion modeling. Chromatic dispersion : As most of the injection lasers used in optical fiber communications have a Gaussian line shape , the MMF chromatic transfer function H C ( f ) can be expressed as a Gaussian function .…”

“…Concerning the validity of this approximation for our case of study, where a relatively small MMF length (300 m for the OM3 fiber) and a light source of a moderate coherence characteristic (Δ λ = 0.5 nm) are used, according to the study presented in , the coherence length of this light source is less than the coherence length of the MMF. Therefore, there are no intermodal interferences, and as a result, under the above conditions, the Gaussian approximation is widely sufficient for the MMF modal dispersion modeling.…”