Showing papers by "Pu Jian published in 2018"
TL;DR: In this article, the authors demonstrate the transmission of the same throughput over multimode fiber using a low-cost Electroabsorption modulated laser (EML) instead of an external MZM.
Abstract: In this paper, 5 Tb/s bidirectional transmission (2.5 Tb/s in each direction) over 2.2 km of OM2 fiber is demonstrated using selective excitation of four mode groups, wavelength division multiplexing, and direct detection. Twenty wavelengths per mode group are used, each wavelength is modulated using discrete multitone scheme with 1024 subcarriers with external lithium niobate Mach–Zehnder modulator (MZM). A minimum bit rate of 68.8 Gb/s per channel is obtained for a bit error rate of 3.8 × 10−2 using a 65 Gs/s digital to analog converter (DAC). Same bit rate is achieved over 4.4 km using 88 Gs/s DAC. Electroabsorption modulated laser (EML) with a 3 dB bandwidth of 18 GHz is also used in the same mode group division transmission. 1 dB power penalty is measured with the EML compared to MZM. A minimum of channel bit rate of 68.5 Gb/s over 2.2 km of OM2 fiber with the EML and 88 Gs/s DAC is reported. Therefore, we demonstrate the transmission of the same throughput over multimode fiber using a low-cost EML instead of an external MZM.
55 citations
11 Mar 2018
TL;DR: In this article, the fabrication of 45 spatial mode multiplexers based on multi-plane light conversion (PLC) was reported for the first time, with an average 4 dB insertion loss and −28 dB cross-talk across the C band.
Abstract: The fabrication of 45 spatial mode multiplexers is reported for the first time. The multiplexers based on Multi-Plane Light Conversion show an average 4 dB insertion loss and −28 dB cross-talk across the C band.
20 citations
TL;DR: In this paper, a 14.5-Tb/s bi-directional transmission over 2.2 km of OM2 fiber using the selective excitation of four mode groups based on multiplane light conversion technology, wavelength division multiplexing, and direct detection was demonstrated.
Abstract: We demonstrate a 14.5-Tb/s bi-directional transmission over 2.2 km of OM2 fiber using the selective excitation of four mode groups based on multiplane light conversion technology, wavelength division multiplexing, and direct detection. Forty wavelengths per mode group are used; each wavelength is modulated with a discrete multitone scheme with a fast Fourier transform length of 1024 subcarriers. An 88-Gs/s digital-to-analog converter is used to drive an external lithium niobate Mach–Zehnder modulator. The impact of each component in the line is studied experimentally. Moreover, Chow's rate-adaptive algorithm for bit and power allocation is optimized and adapted to the region where the bit error rate (BER) increases. In this paper, we are considering a hard-decision forward error correction (FEC) limit corresponding to a BER of 5 × 10−3 and assume a 7% overhead. To the best of our knowledge, the achieved bitrate in this paper is the highest throughput transmitted over multimode fibers using direct detection.
15 citations
01 Sep 2018
TL;DR: This work demonstrates 200Gb/s bidirectional transmission over 20km of step-index FMF fiber using selective excitation of 4 mode groups, direct detection and a single laser in each propagative direction.
Abstract: We demonstrate 200Gb/s bidirectional transmission over 20km of step-index FMF fiber using selective excitation of 4 mode groups, direct detection and a single laser in each propagative direction.
7 citations
Posted Content•
TL;DR: The fabrication of 45 spatial mode multiplexers based on Multi-Plane Light Conversion show an average 4 dB insertion loss and −28 dB cross-talk across the C band.
Abstract: Space Division Multiplexing (SMD) is a very attractive technique for addressing the ever-growing demands in transmission capacity by enabling the use of a new parameter \textemdash\ space \textemdash\ to increase the number of channels in multi-mode fibers. One key component to build a spatially multiplexed-based optical network is a spatial multiplexer and demultiplexer combining signals from multiple single-mode fibers into as many channels in a multi-mode fiber. In this article, we report the fabrication and characterization of a pair of 45-mode spatial multiplexer and demultiplexer saturating all the modes of a standard 50~$\mu$m core graded-index (OM2) multi-mode fiber. The multiplexers are based on Multi-Plane Light Conversion (MPLC), a technique that enables the control of the transverse shape of the light by multiple reflections on specifically designed phase plates. We show that by using a separable variable basis of modes, such as Hermite-Gaussian (HG) modes, we are able to drastically reduce the number of reflections hence reducing the insertion losses and modal crosstalks. The multiplexers typically show an average 4~dB insertion loss and -28~dB cross-talk across the C band. Finally, we emphasize the use of this higher-order modes multiplexer to explore the propagation properties inside multi-mode fibers and more specifically the mode group crosstalks as well as the impact of fiber bending.
7 citations
13 May 2018
TL;DR: In this article, a free-space, bi-directional quantum communication link encoded by two OAM states using multi-port mode converters was demonstrated, achieving a quantum-symbol-error rate of − 0.058 for each channel at 20 Mbit/s/channel when OAM mode-spacing is 4.
Abstract: We experimentally demonstrate a free-space, bi-directional quantum communication link encoded by two OAM states using multi-port mode converters. We achieve a quantum-symbol-error-rate of − 0.058 for each channel at 20 Mbit/s/channel when OAM mode-spacing is 4.
2 citations
11 Mar 2018
TL;DR: The effect of limited aperture size on a 200-Gbit/s retro-reflected free-space optical link between a ground station and a UAV up to ∼100-m roundtrip distance by multiplexing 2 OAM beams is experimentally demonstrated and investigated.
Abstract: We experimentally demonstrate and investigate the effect of limited aperture size on a 200-Gbit/s retro-reflected free-space optical link between a ground station and a UAV up to ∼100-m roundtrip distance by multiplexing 2 OAM beams.
1 citations
13 May 2018
TL;DR: In this paper, the authors demonstrate adaptive-optics compensation of emulated atmospheric turbulence for an OAM-based quantum communication link with a classical Gaussian beam used as probe.
Abstract: We experimentally demonstrate adaptive-optics compensation of emulated atmospheric turbulence for an OAM-based quantum communication link with a classical Gaussian beam used as probe. The turbulence-induced quantum-symbol-error-rate is reduced by « 76 % with the compensation.
1 citations