Design of Refractive Index Profile for Multimode Optical Fibers with Low Differential Mode Delay
نویسنده
چکیده
This work presents an alternative method for design of refractive index profile for silica GeO2-doped graded-index multimode optical fibers 50/125 with low differential mode delay (DMD), providing equalization between group velocities of selected guided modes. Here the objective function is represented as a sum of squares of deviations between points of current iteration group velocity map, which has been calculated over modes with particular orders, and certain reference group velocity value. During the objective function formation it is proposed to take into account only selected guided modes, that depend on the type of laser source and launch conditions. In the given article we represent some results of introduced method approbation with following simulation of fiber optic link based on proposed multimode fibers with low DMD under the core geometry variations.
منابع مشابه
Near-field intensity pattern at the output of silica-based graded-index multimode fibers under selective excitation with a single-mode fiber.
Selective excitation of graded-index multimode fibers (GI-MMFs) with a single-mode fiber (SMF) has gained increased interest for telecommunication applications. It has been proposed as a way to enhance the transmission bandwidth of GI-MMF links and/or create parallel communication channels over the same GI-MMF. Although the effect of SMF excitation on the transmission bandwidth has been investi...
متن کاملKerr self-cleaning of pulsed beam in an ytterbium doped multimode fiber.
We experimentally demonstrate that Kerr spatial self-cleaning of a pulsed beam can be obtained in an amplifying multimode optical fiber. An input peak power of 500 W only was sufficient to produce a quasi-single-mode emission from the double-clad ytterbium doped multimode fiber (YMMF) with non-parabolic refractive index profile. We compare the self-cleaning behavior observed in the same fiber w...
متن کاملBiological glass fibers: correlation between optical and structural properties.
Biological systems have, through the course of time, evolved unique solutions for complex optical problems. These solutions are often achieved through a sophisticated control of fine structural features. Here we present a detailed study of the optical properties of basalia spicules from the glass sponge Euplectella aspergillum and reconcile them with structural characteristics. We show these bi...
متن کاملLow-loss coupling between two single-mode optical fibers with different mode-field diameters using a graded-index multimode optical fiber.
We present a method for ultra-low-loss coupling between two single-mode optical fibers with different mode-field diameters using multimode interference in a graded-index multimode optical fiber. We perform a detailed analysis of the interference effects and show that the graded-index fiber can also be used as a beam expander or condenser. The results are important for devices in which optical f...
متن کاملFour-Wave Mixing of a Laser and Its Frequency-Doubled Version in a Multimode Optical Fiber
It is shown that it is possible to couple a laser beam and its frequency-doubled daughter into a multimode optical fiber through the four-wave mixing nonlinear process and generate a new wavelength. The frequency-doubled daughter can be generated in an external crystal with a large second order nonlinearity. It is argued that while this possibility is within the design parameter range of conven...
متن کامل