All-fiber mode selective couplers for mode-division-multiplexed optical transmission

Sun Hyok Chang; Kwangjoon Kim; Joon Ki Lee

doi:10.1117/12.2249617

28 January 2017 All-fiber mode selective couplers for mode-division-multiplexed optical transmission

Sun Hyok Chang, Kwangjoon Kim, Joon Ki Lee

Proceedings Volume 10130, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI; 1013009 (2017) https://doi.org/10.1117/12.2249617
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

All-fiber mode selective coupler (MSC) is comprised of a few mode fiber (FMF) and a single mode fiber (SMF), coupling the LP₀₁ mode of the SMF to a specific higher-order mode (HOM) of the FMF. In order to achieve high coupling ratio and low insertion loss, phase-matching condition between the LP₀₁ mode of SMF arm and the HOM of FMF arm should be satisfied. A polished-type MSC is made by getting their cores into intimate contact. Prism coupling with a polished coupler block can measure the effective refractive index of the mode accurately. We propose and demonstrate three kinds of allfiber mode multiplexer that is composed of consecutive MSCs. 4-mode multiplexer can multiplex 4 modes of LP₀₁, LP₁₁, LP₂₁, and LP₀₂ by cascading LP₁₁, LP₂₁, and LP₀₂ MSCs. It is used for MDM transmission of three modes with 120 Gb/s DP-QPSK signals. In order to enhance the signal transmission performance by receiving degenerate LP modes simultaneously, a mode multiplexer to utilize two-fold degenerate LP₁₁ modes is proposed. It is composed of two consecutive LP₁₁ MSCs that allows the multiplexing of LP01 mode and two orthogonal LP₁₁ modes. We demonstrates WDM transmission of 30 wavelength channels with 33.3 GHz spacing, each carrying 3 modes, over 560 km of FMF. 6- mode multiplexer can multiplex 6 modes of LP₀₁, LP_11a, LP_11b, LP_21a, LP_21b, LP₀₂ modes. We demonstrated WDM-MDM transmission with the all-fiber 6-mode multiplexer. In this paper, the manufacturing method and the recent advancements of the all-fiber mode multiplexer based on the MSCs are reviewed. Long-distance mode division multiplexing (MDM) optical signal transmissions with the all-fiber mode multiplexer are experimentally demonstrated.

Citation Download Citation

Sun Hyok Chang, Kwangjoon Kim, and Joon Ki Lee "All-fiber mode selective couplers for mode-division-multiplexed optical transmission", Proc. SPIE 10130, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI, 1013009 (28 January 2017); https://doi.org/10.1117/12.2249617

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