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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.
Raman spectroscopy analysis of structural photoinduced changes in GeS2 + Ga2O3 thin films
A.C. Mendes,L.J.Q. Maia,S.H. Messaddeq,Y. Messaddeq,A.R. Zanatta,M. Siu Li 한국물리학회 2010 Current Applied Physics Vol.10 No.6
Photoexpansion and photobleaching effects have been observed in amorphous GeS2 þ Ga2O3 (GGSO) thin films, when their surfaces were exposed to UV light. The photoinduced changes on the surface of the samples are indications that the structure has been changed as a result of photoexcitation. In this paper,micro-Raman, energy dispersive X-ray analysis (EDX) and backscattering electrons (BSE) microscopy were the techniques used to identify the origin of these effects. Raman spectra revealed that these phenomena are a consequence of the GeeS bonds’ breakdown and the formation of new GeeO bonds,with an increase of the modes associated with GeeOeGe bonds and mixed oxysulphide tetrahedral units (SeGeeO). The chemical composition measured by EDX and BSE microscopy images indicated that the irradiated area is oxygen rich. So, the present paper provides fundamental insights into the influence of the oxygen within the glass matrix on the considered photoinduced effects.