A novel method for distributionally evaluating the effective refractive index differences, Δneff, in multimode optical fibers is presented based on the Brillouin spectrum analysis. The proposed method is successfully demonstrated in GeO2-doped step-index 2-mode fibers, for evaluating Δneff between LP01 and LP11 modes, and the method could be straightforwardly expanded to fibers containing higher-order modes, by using a mode demultiplexer supporting the higher-order mode. To the authors’ best knowledge, this is the first report of distributional measurements of the effective refractive index differences in multimode optical fibers.
We propose two mode optical fibers (TMFs) with minimally low differential modal delay (DMD) slope which are suitable to compensate DMD in wide wavelength range. All fabricated TMFs composed of a graded index core and a depressed inner claddings have low DMD slopes of less than |0.15| ps/km/nm, low optical loss of less than 0.21 dB/km for LP01 and LP11 modes respectively and low mode coupling ratio of less than -35 dB at the wavelength of 1550 nm. All TMFs have the similar effective area of 120 μm2 for LP01 mode and 160 μm2 for LP11 mode at 1550 nm. Moreover, it is clarified that a DMD compensation transmission line composed of the fabricated TMFs can successfully achieve the DMD of below |4.0| ps/km in the C+L band and mode conversion ratio of less than -30 dB at splice points.
We describe a novel all-optical hybrid mode-division multiplexing (MDM) -optical code division multiplexing (OCDM) architecture for future flexible access network. We successfully demonstrate, for the first time, an asynchronous on-off keying (OOK) modulation, 2 mode x 4 code x 10 Gbps transmission over 2km two mode fiber (TMF), without dispersion compensation at single wavelength, by using 16-chip (200 Gchip/s), 16-phase-shift keyed (PSK) optical codes (OC) generated by a multiport encoder/decoder (E/D) and an optical mode multiplexer/demultiplexer (MMUX/MDeMUX). We also analytically and experimentally evaluate the mode crosstalk tolerance as a function of the LP01 and LP11 modes.
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