Five-LP-Mode IM/DD MDM Transmission Based on Degenerate-Mode-Selective Couplers With Side-Polishing Processing

Cui, Jian; Gao, Yuyang; Huang, Shuailuo; Yu, Jinyi; Liu, Jiaxin; Jia, Junchi; He, Yongqi; Chen, Zhangyuan; Li, Juhao

doi:10.1109/jlt.2023.3240877

Cited by 16 publications

(7 citation statements)

References 24 publications

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“…However, due to the limitations of directional mode conversion, it is difficult to achieve low-crosstalk and simultaneous demultiplexing of mode groups in MMF, especially for high-order mode groups. For example, utilizing degeneratemode-selective couplers can only achieve simultaneous demultiplexing of mode groups with two degenerate modes [9], [10]. Several weakly-coupled mode-group demultiplexers over MMFs have been proposed so far.…”

Section: Introductionmentioning

confidence: 99%

Scalable low-modal-crosstalk mode-group demultiplexer for MDM transmission over MMF

Cui,

Deng,

Liu

et al. 2024

International Academic Conference on Optics and Photonics (IACOP 2023)

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Weakly-coupled mode-division multiplexing (MDM) transmission technique over widely-deployed multimode fiber (MMF) is considered a promising approach to enhance the capacity of optical fiber communication systems. In order to be compatible with cost-efficient intensity-modulation/direct-detection (IM/DD) systems, effective mode-group demultiplexing approaches to simultaneously receive each mode group of MMF are highly desired. In this paper, we propose a scalable low-modal-crosstalk mode-group demultiplexer over MMF using multi-plane light conversion (MPLC), in which input Hermite-Gaussian (HG) modes of MMF are first converted to bridging modes that composed of HG 00 modes distributed as a right-angled triangle in Cartesian coordinates, and then each HG 00 mode belonging to the same mode group are respectively converted to different HG n0 modes at the same output for simultaneous detection. With the help of bridging modes, the MPLC-based mode-group demultiplexer can scale to demultiplex more mode groups with relatively few phase masks. A 5 mode-group demultiplexer is also design for demonstration, and simulation results show that the modal-crosstalk are lower than -22.26 dB for all mode groups.

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Section: Introductionmentioning

confidence: 99%

Scalable low-modal-crosstalk mode-group demultiplexer for MDM transmission over MMF

Cui,

Deng,

Liu

et al. 2024

International Academic Conference on Optics and Photonics (IACOP 2023)

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“…[30][31][32] By utilizing the optimized SP process, the MDMUX insertion loss of LP 11 and LP 21 reaches 2.5 and 1.9 dB, respectively. 33 Nonetheless, inherent losses exceeding 1 dB remain inescapable for those modes higher than LP 11 , engendering more intricate processing steps and elevated costs. The field of space-division multiplexing anticipates the emergence of MDMUX characterized by low loss and high performance.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, cascaded MSC mode multiplexers founded upon SP demonstrate enhanced insertion loss performance 30 – 32 By utilizing the optimized SP process, the MDMUX insertion loss of LP11 and LP21 reaches 2.5 and 1.9 dB, respectively 33 . Nonetheless, inherent losses exceeding 1 dB remain inescapable for those modes higher than LP11, engendering more intricate processing steps and elevated costs.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low-loss all-fiber orbital angular momentum mode-division multiplexer based on cascaded fused-biconical mode selective couplers

Guo,

Liu,

Chen

et al. 2024

Adv. Photon. Nexus

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.Mode-division multiplexers (MDMUXs) play a pivotal role in enabling the manipulation of an arbitrary optical state within few-mode fibers, offering extensive utility in the fields of mode-division multiplexing and structured optical field engineering. The exploration of MDMUXs employing cascaded resonant couplers has garnered significant attention owing to their scalability, exceptional integration capabilities, and the anticipated low insertion loss. In this work, we present the successful realization of high-quality orbital angular momentum MDMUX corresponding to topological charges 0, ±1, and ±2, achieved through the utilization of cascaded fused-biconical tapered couplers. Notably, the measured insertion losses at 1550 nm exhibit remarkable minimal values: 0.31, 0.10, and 0.64 dB, respectively. Furthermore, the 80% efficiency bandwidths exceed 106, 174, and 174 nm for these respective modes. The MDMUX is composed of precision-manufactured high-quality mode selective couplers (MSCs). Utilizing a proposed supermode propagation method based on mode composition analysis, we precisely describe the operational characteristics of MSCs. Building upon this comprehensive understanding, we embark on a pioneering analysis elucidating the influence of MSC cascading order on the performance of MDMUXs. Our theoretical investigation substantiates that when constructing MDMUXs, MSCs should adhere to a specific cascading sequence.

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“…A low-modal-crosstalk orthogonal combined reception scheme for degenerate mode demultiplexing is firstly investigated [23]. Then, a degenerate-mode-selective coupler (DMSC) is proposed, which could simplify the demultiplexer [24]. The two schemes are realized by tapering and side-polishing techniques.…”

Section: Introductionmentioning

confidence: 99%

All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission

Gao,

Cui,

Zhou

et al. 2024

Photonics

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Weakly coupled mode-division multiplexing (MDM) techniques supporting intensity modulation and direct detection (IM/DD) transmission are promising methods of enhancing the capacity of short-reach scenarios in which low-modal-crosstalk-mode demultiplexers for degenerate linear polarized (LP) modes are highly desired. In this paper, we review two degenerate-mode reception schemes. Firstly, a low-modal-crosstalk orthogonal combined reception method for degenerate modes is proposed based on all-fiber mode-selective couplers, in which signals in both degenerate modes are demultiplexed into the LP01 mode of single-mode fibers and then are multiplexed into the mutually orthogonal LP01 and LP11 modes of a two-mode fiber (TMF) for simultaneous detection. Secondly, a novel degenerate-mode-selective coupler consisting of an input few-mode fiber and an output TMF is proposed, which could demultiplex degenerate LP modes without any digital signal processing (DSP). Both demultiplexers are achieved based on the taper and polish process. The fabricated devices are characterized and compared. The results show that the proposed schemes can pave the way to the practical implementation of DSP-free IM/DD LP-mode MDM transmission systems.

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Five-LP-Mode IM/DD MDM Transmission Based on Degenerate-Mode-Selective Couplers With Side-Polishing Processing

Cited by 16 publications

References 24 publications

Scalable low-modal-crosstalk mode-group demultiplexer for MDM transmission over MMF

Scalable low-modal-crosstalk mode-group demultiplexer for MDM transmission over MMF

Ultra-low-loss all-fiber orbital angular momentum mode-division multiplexer based on cascaded fused-biconical mode selective couplers

All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission

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