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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>
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>
Wavelength-selective switch with direct few mode fiber integration.
Marom, D M,Dunayevsky, J,Sinefeld, D,Blau, M,Ryf, R,Fontaine, N K,Montoliu, M,Randel, S,Liu, C,Ercan, B,Esmaeelpour, M,Chandrasekhar, S,Gnauck, A H,Leon-Saval, S G,Bland-Hawthorn, J,Salazar-Gil, J R,S Optical Society of America 2015 Optics express Vol.23 No.5
<P>The first realization of a wavelength-selective switch (WSS) with direct integration of few mode fibers (FMF) is fully described. The free-space optics FMF-WSS dynamically steers spectral information-bearing beams containing three spatial modes from an input port to one of nine output ports using a phase spatial light modulator. Sources of mode dependent losses (MDL) are identified, analytically analyzed and experimentally confirmed on account of different modal sensitivities to fiber coupling in imperfect imaging and at spectral channel edges due to mode clipping. These performance impacting effects can be reduced by adhering to provided design guidelines, which scale in support of higher spatial mode counts. The effect on data transmission of cascaded passband filtering and MDL build-up is experimentally investigated in detail.</P>