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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>
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>