A 6-LP-mode ultralow-modal-crosstalk double-ring-core FMF for weakly-coupled MDM transmission

Ge, Dawei; Gao, Yuyang; Yang, Yu; Shen, Lei; Li, Zhengbin; Chen, Zhangyuan; He, Yongqi; Li, Juhao

doi:10.1016/j.optcom.2019.06.015

Cited by 77 publications

(19 citation statements)

References 22 publications

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“…The first step is to design the index profile, which can adopt the same structure as the transmission FMF so that the modal crosstalk for their connections can be eliminated. The design principle of a transmission MRC-FMF can be derived by a perturbation method [9], where the fiber is treated as a perturbed SI-CC FMF with multiple ring areas. Since the modal crosstalk between different LP modes in FMFs is in inverse relation to the modal effective index difference (| n eff |), the multiple ring areas are applied to adjust all the modes towards equal effective index spacing to enlarge the minimum modal effective index difference (min| neff|) as much as possible.…”

Section: Principles Of Weakly-coupled Fm-edfamentioning

confidence: 99%

“…Some weakly-coupled FMF designs with simple structures have been proposed such as step-index circular-core (SI-CC) FMF with high index difference between fiber core and cladding [7], however, it's hard for them to be extended to support more independent modes. To overcome this problem, weakly-coupled FMFs with multi-ring-core (MRC) structures have been proposed [8], [9], in which multiple concentric ring areas are utilized to enlarge the effective index difference among all the linearly-polarized (LP) modes. Previous transmission experiment has shown that the MRC-FMF can supports more than 100-km single-span weakly-coupled MDM transmission [10], which is highly expected to be further extended with inline optical amplification.…”

Section: Introductionmentioning

confidence: 99%

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Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

et al. 2021

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Recently weakly-coupled mode-division multiplexing (MDM) transmission systems and networks based on ultralow-modal-crosstalk few-mode fiber (FMF) have attracted much interest, for which optical amplification technologies with low modal crosstalk and twodimension mode-wavelength gain flattening are highly desired. In this paper, we propose for the first time a design method for few-mode Erbium-doped fiber (FM-EDF) with multiring-core (MRC) structures of both index and Erbium doping, which has high compatibility with the transmission MRC-FMF and low differential modal gain (DMG) with simple pump injection requirement. By sharing the boundaries of ring areas for both index and Erbium doping, the design method also helps to reduce the complexity of preform fabrication. We show by simulation that at 1550-nm signal wavelength, a 6-mode MRC-EDF can achieve a minimum DMG of 0.35-dB with only LP 11 pump light injection and a 10-mode MRC-EDF can achieve a minimum DMG of 0.60-dB with LP 01 and LP 03 pump lights injection. Besides, the tolerance of DMG to the variation of fiber parameters induced by fabrication is analyzed. The proposed FM-EDF is beneficial for the practical applications of weakly-coupled MDM transmission systems and networks.

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Section: Principles Of Weakly-coupled Fm-edfamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

et al. 2021

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“…To connect FMF and SMF, fiber-based MSCs are utilized as the mode multiplexer/demultiplexer (MUX/DEMUX), which are fabricated by heating and tapering the FMF and SMF. With the help of MSCs, the mode of optical pulses can be transformed each other between the fundamental mode of SMF and the specific LP mode of FMF [18]. The attenuation and the insertion loss (IL) of MSC as the MUX/DEMUX in each LP mode are characterized, as listed in Table 1.…”

Section: Few-mode Fiber Characterizationmentioning

confidence: 99%

“…In this paper, we present for the first time a mode-wavelength dual multiplexing QKD implementation over weakly-coupled FMF coexisting with classical optical communication. Using the all-fiber mode-selective couplers (MSCs) [17,18], the co-propagation distance of QKD with one 100 Gbps data channel at -2.60 dBm launched power reaches 86 km with a secure key rate of 1.3 kbps. At the same fiber-input power, compared with SMF, SRS noise in FMF is reduced by 86% in average.…”

Section: Introductionmentioning

confidence: 99%

Long-distance transmission of quantum key distribution coexisting with classical optical communication over a weakly-coupled few-mode fiber

Wang¹,

Mao²,

Shen³

et al. 2020

Opt. Express

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Quantum key distribution (QKD) is one of the most practical applications in quantum information processing, which can generate information-theoretical secure keys between remote parties. With the help of the wavelengthdivision multiplexing technique, QKD has been integrated with the classical optical communication networks. The wavelength-division multiplexing can be further improved by the mode-wavelength dual multiplexing technique with few-mode fiber (FMF), which has additional modal isolation and large effective core area of mode, and particularly is practical in fabrication and splicing technology compared with the multi-core fiber. Here, we present for the first time a QKD implementation coexisting with classical optical communication over weakly-coupled FMF using all-fiber mode-selective couplers. The co-propagation of QKD with one 100 Gbps classical data channel at -2.60 dBm launched power is achieved over 86 km FMF with 1.3 kbps real-time secure key generation. Compared with single-mode fiber, the average Raman noise in FMF is reduced by 86% at the same fiber-input power. Our work implements an important approach to the integration between QKD and classical optical communication and previews the compatibility of quantum communications with the next-generation mode division multiplexing networks.

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“…Implementation of MDM systems using few-mode optical fiber (FMF) were reported. Some all-fiber MDM multiplexers (MUXs) and demultiplexers (DEMUXs) were proposed and fabricated, such as all-fiber directional mode selective couplers (MSCs) [15,16], long period fiber grating (LPFG) [17,18] and photonic lanterns (PLs) [19,20]. Mode MUX/DEMUX using free-space optical setups were also reported [21].…”

Section: Introductionmentioning

confidence: 99%

Compact Mode Division MUX/DEMUX Using Enhanced Evanescent-Wave Coupling on Silicon-on-Insulator (SOI) Platform for 11-Tbit/s Broadband Transmission

et al. 2020

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Mode-division-multiplexing (MDM) can increase the total on-chip transmission capacity. Silicon-on-insulator (SOI) based MDM multiplexer (MUX) and demultiplexer (DEMUX) using asymmetrical directional couplers (ADCs) are promising; however, they usually require long coupling lengths for mode conversion. Here, for the first time up to the authors' knowledge, we propose, simulate, fabricate and demonstrate a size reduced SOI based 4 × 4 MDM MUX and DEMUX using enhanced evanescent-wave coupling (EEC). Here, we illustrate by experiments and numerically analyses that by size reducing the ADC access coupling region, evanescent-wave coupling is enhanced. Significant coupling length reduction of ~80 % can be achieved, while similar MDM MUX and DEMUX performance can be observed. To experimentally evaluate the broadband and high-speed transmission operations of the proposed device, 48 wavelength channels each modulated by > 60 Gbit/s orthogonal frequency division multiplexing (OFDM) signals are successfully mode multiplexed and demultiplexed, achieving a transmission capacity of 11.73 Tbit/s. INDEX TERMS Silicon Photonics (SiPh); mode division multiplexing (MDM), orthogonal-frequencydivision-multiplexing (OFDM).

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A 6-LP-mode ultralow-modal-crosstalk double-ring-core FMF for weakly-coupled MDM transmission

Cited by 77 publications

References 22 publications

Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

Long-distance transmission of quantum key distribution coexisting with classical optical communication over a weakly-coupled few-mode fiber

Compact Mode Division MUX/DEMUX Using Enhanced Evanescent-Wave Coupling on Silicon-on-Insulator (SOI) Platform for 11-Tbit/s Broadband Transmission

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