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학술대회 All-fiber Mode Selective Couplers for Mode-division-multiplexed Optical Transmission
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저자
장순혁, 김광준, 이준기
발행일
201701
출처
SPIE OPTO 2017 (SPIE 10130), v.10130, pp.1-6
DOI
https://dx.doi.org/10.1117/12.2249617
협약과제
16MH5200, 멀티모드 기반의 10Km급 공간 다중 광전송 원천기술 연구, 김광준
초록
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, LP11a, LP11b, LP21a, LP21b, 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.
키워드
Mode, Mode multiplexer, Mode selective coupler, Mode-division-multiplexed, Optical transmission
KSP 제안 키워드
All-fiber, Coupling ratio(CR), Coupling with, DP-QPSK, Effective Refractive Index, High coupling, Intimate contact, Manufacturing method, Mode division multiplexing(MDM), Optical signal, Prism coupling