Mode-division multiplexed transmission of wavelength-division multiplexing signals over a 100-km single-span orbital angular momentum fiber Download: 832次
1 State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510006, China
2 State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Yangtze Optical Fiber and Cable Joint Stock Limited Company, Wuhan 430073, China
3 Photonics Group, Merchant Venturers School of Engineering, University of Bristol, Bristol BS8 1UB, UK
4 e-mail: s.yu@bristol.ac.uk
Figures & Tables
Fig. 1. (a) Cross-sectional diagram, (b) RIP, and (c) propagation loss of the RCF used in the experiment.
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Fig. 2. Experimental setup for OAM-MDM/WDM data transmission. The intensity profiles of MGs (i) |l|=2 and (ii) |l|=3 after 100-km RCF transmission. WDM, wavelength-division multiplexer; AWG, arbitrary waveform generator; OC, optical coupler; EDFA, erbium-doped fiber amplifier; PC, polarization controller; Col., collimator; SMF, single-mode fiber; LP, linear polarizer; SLM, spatial light modulator; MR, mirror; PBC, polarizing beam combiner; HWP, half-wave plate; BS, beam splitter; QWP, quarter-wave plate; PBS, polarizing beam splitter; VPP, vortex phase plate; PM, power meter; ICR, integrated coherent receiver; LO, local oscillator. Note that the optical switches are utilized to switch between setups for fiber characterization and data transmission.
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Fig. 3. The absolute values of complex tap weights of the 16 FIR filters in 4×4 MIMO equalizer to equalize the four modes in MGs (a) |l|=2 and (b) |l|=3 after 100-km RCF transmission.
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Fig. 4. Measured BER versus OSNR of MGs (a) |l|=2 and (b) |l|=3 at 1550.12 nm after 100-km RCF transmission; constellation diagrams of the recovered 16-GBaud QPSK signals of all simultaneously transmitted OAM mode channels of MGs (c) |l|=2 and (d) |l|=3 at an OSNR of 24 dB after 100-km RCF transmission.
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Fig. 5. (a) Measured BERs of all 80 channels after 100-km RCF transmission; (b) optical spectra of the 10 WDM channels at the transmitter side.
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Table1. Data Transmission of RCF-Based MDM Systems in Recent Works
RCF Types | Loss (dB/km) | Signal and MIMO DSP | Number of MDM Channels | Number of WDM Channels | Capacity (Tbit/s) | Distance (km) | Capacity-Distance Product [(Tbit/s) · km] | Refs. | Elliptical ring core | — | QPSK, MIMO free | 6 | 1 | 0.384 | 0.9 | 0.3456 | [17,18] | Graded index | — | OOK, MIMO free | 2 | 1 | 0.02 | 0.1 | 0.002 | [19] | Step index | — | OOK, MIMO free | 2 | 1 | 0.02 | 1 | 0.02 | [20] | Graded index | — | OOK, MIMO free | 3 | 1 | 0.0375 | 0.36 | 0.0135 | [21] | Graded index | 0.75 | 16QAM/QPSK-DMT, MIMO free | 3 | 1 | 0.1 | 1 | 0.1 | [11] | Graded index | 0.75 | QPSK-DMT, MIMO free | 2 | 1 | 0.04 | 18.4 | 0.736 | [11] | Graded index | 1 | 8QAM, MIMO free | 2 | 112 | 8.4 | 18 | 151.2 | [22] | RIP-modulated | 0.31 | OOK, MIMO free | 2 | 1 | 0.015 | 50 | 0.75 | [23] | RIP-modulated | 0.21 | OOK, MIMO free | 2 | 4 | 0.12 | 100 | 12 | [24] | Step index | 0.3 | 16QAM, MIMO | 10 | 1 | 1.12 | 1 | 1.12 | [25] | Step index | 0.3 | QPSK, MIMO | 10 | 1 | 0.56 | 24 | 13.44 | [25] | Graded index | 1 | QPSK, MIMO | 8 | 10 | 5.12 | 10 | 51.2 | [12] | RIP-modulated | 0.31 | QPSK, MIMO | 8 | 10 | 2.56 | 50 | 128 | [26] | RIP-modulated | 0.21 | QPSK, MIMO | 8 | 10 | 2.56 | 100 | 256 | This work |
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Table2. Characteristics of the Fabricated RCF
| | | | | | () | 0.7 | 1.8 | 2.5 | Attenuation | (dB/km) | 0.209 | 0.211 | 0.208 | 0.210 | DGD | (ns/km) | 0 | 3.2 | 8.5 | 13.1 |
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Table3. Measured Inter-MG Crosstalk among the Two Used High-order OAM MGs over the 100-km RCF Transmission System
| Input MG | Input MG | Output MG | Output MG | Output MG | Output MG | Crosstalk (dB) | 0 | −12.495 | −11.486 | 0 |
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Junwei Zhang, Junyi Liu, Lei Shen, Lei Zhang, Jie Luo, Jie Liu, Siyuan Yu. Mode-division multiplexed transmission of wavelength-division multiplexing signals over a 100-km single-span orbital angular momentum fiber[J]. Photonics Research, 2020, 8(7): 07001236.