In this letter, we designed and fabricated an all fiber-optic Add/Drop element based on Taper-Resonator-Taper (TRT) structure, assembling it with V-shaped grooves. We proposed a novel configuration composed of two microspheres and three taper fibers . We can cascade this kind of TRT structure, it will be potentially used as multi-wavelengths Optical Add/Drop Multiplexer and
Wavelength Division Multiplexer/Demultiplexer.
There are numerous methods for evanescently coupling energy into the modes of a sphere. In this paper, we provided a new methods, used long period fiber gratings (LPFG) coupling evanescent wave into microsphere resonator. We have illustrated this coupling mechanism in theoretical. As an potentially application, we describe a four-port passive Add/Drop device based on the microsphere-LPFG coupling mechanism.
In this paper, we theoretically study the optimize design of the parabolic gradient-index lens used as laser diode to single mode fiber coupling lens. In order to enhance the coupling efficiency between the LD and the SMF, we have calculated the aberration (longitudinal spherical aberration (LSA), offense against sine condition (OSC) and optimized the parameter of the parabolic gradient-index coupling lens by solving the ray equation with the standard Runge-Kutta method. From analysis of the parabolic GRIN coupling lens, it turns out as follow: i) axis GRIN constant L can affect the aberration, ii) the plane-convex parabolic GRIN coupling lens with small end towards LD is the best design, iii) we obtain groups of optimized biplane, plane-convex parabolic GRIN coupling lens.
We have proposed a physical bus and logical star DWDM-OADM architecture optical transport network in the Railway Communication Company's area communication. The OADM optical nodes architecture was illustrated, the logical dual-star architecture 's self-healing fUnction was described. We have demonstrated the logical single-star architecture network transmission performance.
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