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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.
Oxide Glasses for Holographic Data Storage
Gaë,l Poirier,Marcelo Nalin,Sidney J,L Ribeiro,Younes Messaddeq 한국세라믹학회 2007 세라미스트 Vol.10 No.3
Novel photochromic oxide glasses are presented in this section. These glasses are based on phosphate formers containing both tungsten and antimony atoms. Exposure to visible continuous or pulsed laser beam results in an intense photochromic effect witch is shown to occur in the volume of the glass and results in a broad absorption band in the visible and near infrared. This effect was not identified to be related with a sσuctural change and is assumed to be entirely electronic. A change in the absorption coefficient is observed in function of tungsten content, exposure time and increases with beam power. These glasses have been investigated regarding the possibilty of holographic data storage using visible lasers sources. Changes in both refractive index and the absorption coefficient were measured using a holographic setup. The modulation of the optical constants is reversible by heat treatment.
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>
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.