Low-cost fibre-optic gyroscope

Poisel, Hans; Trommer, Gert F.; Buhler, W.; Hartl, E.; Müller, Reinhard

doi:10.1049/el:19900045

Cited by 14 publications

(2 citation statements)

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“…This phase shift has been used in fiber gyroscopes for phase biasing. 6 In contrast with the 2 ϫ 2 coupler, the phase difference between the transmitted and coupled fields in a 3ϫ3 coupler depends on the magnitude of the coefficients. This dependence of phase difference on C is shown in Fig.…”

Section: Multiport Couplersmentioning

confidence: 99%

Interferometric model for phase analysis in fiber couplers

1996

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An interferometric model is proposed to estimate the phase differences in lossless, strongly coupled biconical fiber couplers. This approximate method is simpler than the traditional s-parameter network theory-based analysis technique and minimizes the number of unknowns. The phase difference between the transmitted and coupled light fields is directly related to the field interaction and can be estimated by employing the energy conservation and mode orthogonality principles. The maximum coupling coefficient and dependence of phase difference on coupling conditions can be analyzed for multiport single-mode fiber couplers.

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Section: Multiport Couplersmentioning

confidence: 99%

Interferometric model for phase analysis in fiber couplers

1996

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“…The most popular ones are equilateral triangular and linear array types. The couplers with 120 degrees of rotational symmetry for the equilateral triangular cross section have application in gyroscopes and interferometers [6,7], but it seems practically difficult to fabricate the couplers in ideal symmetry geometry. For the linear array type 1×3 couplers, the method of holding fibers in parallel for the fabrication of conventional 1×2 couplers can be readily applied.…”

Section: Introductionmentioning

confidence: 99%

3-D Electromagnetic Modeling of Polarization-Dependent Coupling Characteristics of 1×3 Linear Array Weakly Fused Fiber Couplers

2003

Fiber and Integrated Optics

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Based on the full-wave surface integral equations method and the steplike approximation technique, a three-dimensional (3-D) electromagnetic model for simulating polarization-dependent power-coupling behavior of 1×3 linear array weakly fused fiber couplers is proposed. The accuracy of the proposed numerical model is confirmed to be good by comparing with the measured power transfer behavior at the fusing and elongating process of the couplers. In the 3-D modeling view, the polarization-dependent coupling behavior of two practical couplers, 1/3 power splitter and wavelength-flattened coupler, are numerically studied. It is seen that as the coupler is designed in a very weakly fused condition the polarization-dependent loss (PDL) is significantly increased. For designing the 1×3 coupler with low PDL, it is suggested that the aspect ratio has to be controlled in stronger fused range between 0.8 and 0.9.

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