Journal ArticleDOI
Analysis of a tunable single mode optical fiber coupler
Michel J. F. Digonnet,H.J. Shaw +1 more
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TLDR
In this article, the authors report the operation and theoretical modeling of an efficient, tunable, and low-loss single-mode fiber coupler, which can be tuned to achieve up to 100 percent coupling ratio and 50 dB extinction ratio between coupled and direct branches.Abstract:
We report the operation and the theoretical modeling of an efficient, tunable, and low-loss single mode fiber coupler. The coupler design follows a scheme previously reported, in which two optical fibers mounted in curved grooves in separate quartz substrates are polished until sufficient cladding material has been removed to permit optical coupling between the mated polished faces of the fibers. The results of a computer analysis of the distributed coupling taking place between the fibers are discussed, emphasizing the intuitive dependences of the coupling coefficient and effective interaction length of the device on its geometrical parameters. A detailed experimental analysis of fiber couplers follows in which we characterize two types of couplers made with different brands of single-mode fibers. Operation up to 100 percent coupling ratio and 50 dB extinction ratio between coupled and direct branch as well as operation in overcoupling regimes are demonstrated, both at visible and infrared signal wavelengths. Tuning curves are shown that emphasize the excellent tunability properties of such couplers in which the coupling ratio can be smoothly and continuously tuned between 0 and 100 percent. Experimental evidence of the relatively low loss level and very low polarization dependence of the fiber couplers are also presented. All experimental results, including an analysis of the influence of the refractive index of the intermediate layer of index-matching liquid between the polished faces of the fibers, are found to be very well predicted by our theoretical model.read more
Citations
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Journal ArticleDOI
On the design of highly luminescent lanthanide complexes
TL;DR: In this paper, a review of the design of highly luminescent lanthanide complexes is presented, where the authors discuss all aspects needing optimization, including the various energy migration processes in luminescence sensitization by organic ligands, minimizing non-radiative deactivation mechanisms, as well as other parameters such as the radiative lifetime, the refractive index, and the benefit of inserting luminecent complexes into inorganic-hybrid structures.
Journal ArticleDOI
Coupled-mode theory
H.A. Haus,W. Huang +1 more
TL;DR: In this paper, the authors give a brief historic perspective of the coupled mode theory and the development and applications of the theory in microwaves in early years and in optoelectronics and fiber optics in recent years.
Journal ArticleDOI
All-single-mode fiber resonator.
TL;DR: An all-fiber-ring resonator has been constructed using a single strand of single-mode optical fiber and a directional coupler and a finesse of 80 has been achieved experimentally.
Journal ArticleDOI
Fiber-optic lattice signal processing
TL;DR: In this paper, the authors discuss the implementation of fiber-optic lattice structures incorporating singlemode fibers and directional couplers, and show that the pole of the system transfer function with the largest magnitude is simple and positive-valued (in the Z-plane), and that the magnitude of the frequency response can nowhere exceed its value at the origin.
Patent
Fiber optic amplifier
Herbert J. Shaw,M.J.F. Digonnet +1 more
TL;DR: In this paper, the authors used a multiplexing coupler to combine the signal to be amplified and illumination from a pumping illumination source onto a single optical fiber, where the pumping illumination inverts the neodymium ions within the ND:YAG crystal.
References
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Journal ArticleDOI
Coupled-Mode Theory for Optical Fibers
TL;DR: In this paper, a set of coupled-mode equations is derived to describe mode propagation in uniform and slightly nonuniform cylindrical optical-fiber systems, and the coupling between fibers of an array made up of n identical fibers each at the vertex of a polygon and one at the center, which is not necessarily the same as its n neighbors, is determined.
Journal ArticleDOI
Single-mode fibre fractional wave devices and polarisation controllers
TL;DR: In this article, the authors describe new single-mode fiber optic devices which are completely equivalent to fractional wave plates of classical optics and employ a very simple configuration which uses the stress birefringence induced by bending the fibre.
Journal ArticleDOI
Single-mode fibre optic directional coupler
TL;DR: In this paper, a technique for the fabrication of singlemode fiber optic directional couplers is presented for the single-mode optical fiber optic (SOMO) directional coupler.
Journal ArticleDOI
Coupling of Optical Fibers and Scattering in Fibers
TL;DR: In this paper, the authors considered the phenomena of optical coupling of parallel fibers and scattering of light from a fiber due to rough walls and cast the problems in the form of integral equations with the use of a Green's function.
Journal ArticleDOI
Electrically switched optical directional coupler: Cobra
M. Papuchon,Y. Combemale,X. Mathieu,D. B. Ostrowsky,L. Reiber,A. M. Roy,B. Sejourne,M. Werner +7 more
TL;DR: In this paper, an integrated optical switch/modulator consisting of an active directional coupler with a novel electrode configuration is presented, in titanium-diffused lithium niobate.