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Mode-multiplexed transmission over conventional graded-index multimode fibers.
Ryf, R,Fontaine, N K,Chen, H,Guan, B,Huang, B,Esmaeelpour, M,Gnauck, A H,Randel, S,Yoo, S J B,Koonen, A M J,Shubochkin, R,Sun, Y,Lingle, R Optical Society of America 2015 Optics express Vol.23 No.1
<P>We present experimental results for combined mode-multiplexed and wavelength multiplexed transmission over conventional graded-index multimode fibers. We use mode-selective photonic lanterns as mode couplers to precisely excite a subset of the modes of the multimode fiber and additionally to compensate for the differential group delay between the excited modes. Spatial mode filters are added to suppress undesired higher order modes. We transmit 30-Gbaud QPSK signals over 60 WDM channels, 3 spatial modes, and 2 polarizations, reaching a distance of 310 km based on a 44.3 km long span. We also report about transmission experiments over 6 spatial modes for a 17-km single-span experiment. The results indicate that multimode fibers support scalable mode-division multiplexing approaches, where modes can be added over time if desired. Also the results indicate that mode-multiplexed transmission distance over 300 km are possible in conventional multimode fibers.</P>
Transmission Over 1050-km Few-Mode Fiber Based on Bidirectional Distributed Raman Amplification
Esmaeelpour, Mina,Ryf, Roland,Fontaine, Nicolas K.,Haoshuo Chen,Gnauck, Alan H.,Essiambre, Rene-Jean,Toulouse, Jean,Yi Sun,Lingle, Robert IEEE 2016 Journal of Lightwave Technology Vol.34 No.8
<P>We characterize the distributed Raman amplification in a 70-km three spatial-mode few-mode fiber with different pump configurations and demonstrate bidirectional pumped Raman amplification and 1050 km combined wavelength-division and spatial-division multiplexed transmission in the same fiber with a zero net gain fiber span.</P>
Demonstration of Cladding-Pumped Six-Core Erbium-Doped Fiber Amplifier
Haoshuo Chen,Fontaine, Nicolas K.,Ryf, Roland,Cang Jin,Bin Huang,Kuanping Shang,Essiambre, Rene-Jean,Lixian Wang,Hayashi, Tetsuya,Nagashima, Takuji,Sasaki, Takashi,Messaddeq, Younes,LaRochelle, Sophie IEEE 2016 Journal of Lightwave Technology Vol.34 No.8
<P>We demonstrate cladding-pumped six-core Erbium-doped fiber amplifiers (EDFAs) using two different pump coupling schemes: edge-coupled and side-coupled pumping, where a single multimode laser diode can be applied to pump all cores. Using two in-line cladding-pumped EDFAs at the input and output of a 31-km coupled-six-core fiber, we realized 465-km space-division multiplexing and wavelength division multiplexing transmission in a recirculating loop and achieved a spectral efficiency of 18 bits/s/Hz. Through side-coupled pumping, the cladding-pumped six-core EDFA produced >18-dBm output power per core and had <;6-dB noise figure across the C-band.</P>
All-fiber mode-group-selective photonic lantern using graded-index multimode fibers
Huang, Bin,Fontaine, Nicolas K.,Ryf, Roland,Guan, Binbin,Leon-Saval, Sergio G.,Shubochkin, R.,Sun, Y.,Lingle, R.,Li, Guifang The Optical Society 2015 Optics express Vol.23 No.1
<P>We demonstrate the first all-fiber mode-group-selective photonic lantern using multimode graded-index fibers. Mode selectivity for mode groups LP(01), LP(11) and LP(21)+LP(02) is 20-dB, 10-dB and 7-dB respectively. The insertion loss when butt coupled to multimode graded-index fiber is below 0.6-dB. The use of the multimode graded-index fibers in the taper can significantly reduce the adiabaticity requirement.</P>
Chang, Sun Hyok,Chung, Hwan Seok,Ryf, Roland,Fontaine, Nicolas K,Han, Changyo,Park, Kyung Jun,Kim, Kwangjoon,Lee, Jyung Chan,Lee, Jong Hyun,Kim, Byoung Yoon,Kim, Young Kie Optical Society of America 2015 Optics express Vol.23 No.6
<P>We propose all-fiber mode multiplexer composed of two consecutive LP?????? mode selective couplers that allows for the multiplexing of LP?????? mode and two-fold degenerate LP?????? modes. We demonstrate WDM transmission of 32 wavelength channels with 100 GHz spacing, each carrying 3 modes of 120 Gb/s polarization division multiplexed quadrature phase shifted keying (PDM-QPSK) signal, over 560 km of few-mode fiber (FMF). Long distance transmission is achieved by 6??6 multiple-input multiple-output digital signal processing and modal differential group delay compensated link of FMF. The all-fiber mode multiplexer has considerable potential to be used in mode- and wavelength-division multiplexed transmission.</P>
All-fiber 6-mode multiplexers based on fiber mode selective couplers
Chang, Sun Hyok,Moon, Sang-Rok,Chen, Haoshuo,Ryf, Roland,Fontaine, Nicolas K.,Park, Kyung Jun,Kim, Kwangjoon,Lee, Joon Ki The Optical Society 2017 Optics express Vol.25 No.5
<P>All-fiber 6-mode multiplexer composed of two consecutive LP11-mode selective couplers (MSC), two LP21-MSCs and an LP02-MSC is fully characterized by wavelength-swept interferometer technique. The MSCs are fabricated by polished-type fiber couplers coupling LP01 mode of a single mode fiber into a higher-order mode of a few mode fiber. A pair of the mode multiplexers has minimum mode dependent loss of 4 dB and high mode group selectivity of over 15 dB. Mode division multiplexed transmission enabled by the all-fiber mode multiplexers is demonstrated over fiber spans of 117 km employing an in-line multi-mode optical amplifier. 6 modes of 120 Gb/s dual polarization quadrature phase shift keying signals combined with 30 wavelength channels are successfully transmitted. (C) 2017 Optical Society of America</P>
Chen, H.,Jin, C.,Huang, B.,Fontaine, N. K.,Ryf, R.,Shang, K.,Gré,goire, N.,Morency, S.,Essiambre, R.-J.,Li, G.,Messaddeq, Y.,LaRochelle, S. Nature Publishing Group 2016 Nature photonics Vol.10 No.8
Space-division multiplexing (SDM), whereby multiple spatial channels in multimode and multicore optical fibres are used to increase the total transmission capacity per fibre, is being investigated to avert a data capacity crunch and reduce the cost per transmitted bit. With the number of channels employed in SDM transmission experiments continuing to rise, there is a requirement for integrated SDM components that are scalable. Here, we demonstrate a cladding-pumped SDM erbium-doped fibre amplifier (EDFA) that consists of six uncoupled multimode erbium-doped cores. Each core supports three spatial modes, which enables the EDFA to amplify a total of 18 spatial channels (six cores × three modes) simultaneously with a single pump diode and a complexity similar to a single-mode EDFA. The amplifier delivers >20 dBm total output power per core and <7 dB noise figure over the C-band. This cladding-pumped EDFA enables combined space-division and wavelength-division multiplexed transmission over multiple multimode fibre spans.
Huang, Bin,Chen, Haoshuo,Fontaine, Nicolas K.,Jin, Cang,Shang, Kuanping,Ryf, Roland,Essiambre, Rene-Jean,Ung, Bora,Messaddeq, Younes,LaRochelle, Sophie,Li, Guifang IEEE 2017 Journal of Lightwave Technology Vol.35 No.4
<P>We directly measure the spatially and spectrally resolved gain of erbium doped multicore and few mode fiber amplifiers using a coherent swept wavelength interferometer operated in the reflection mode. It greatly simplifies the characterization of multispatial mode amplifiers because it enables characterization of the mode-dependent gain with only a single mode-selective multiplexer at the input. The gains for both multicore fiber amplifier and three spatial modes (LP<SUB>01</SUB> and <TEX>${\rm{LP}}_{{11}}$</TEX>) amplifier are measured. Measurements for multicore fiber amplifier are conducted using two pump schemes, core pump and cladding pump. Also, the comparison with the cutback experiments shows the validity of this technique.</P>
Mode division multiplexed optical transmission enabled by all-fiber mode multiplexer.
Chang, Sun Hyok,Chung, Hwan Seok,Fontaine, Nicolas K,Ryf, Roland,Park, Kyung Jun,Kim, Kwangjoon,Lee, Jyung Chan,Lee, Jong Hyun,Kim, Byoung Yoon,Kim, Young Kie Optical Society of America 2014 Optics express Vol.22 No.12
<P>Mode division multiplexed optical transmission enabled by all-fiber mode multiplexer is investigated. The proposed all-fiber mode multiplexer is composed of consecutive mode selective couplers. It multiplexes or demultiplexes LP01, LP11, LP21, and LP02 modes simultaneously. We demonstrate successful transmission of three spatial modes with 120 Gb/s PDM-QPSK signals over 15 km of four mode fiber by using 6x6 MIMO digital signal processing.</P>