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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>
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>
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>