Browsing by Author "Zhang, Liyan"

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CW-pumped evanescent amplification based on side-polished fiber with heavily Er3+-doped glass overlay
(2006-08-01)
Chen, Nan-Kuang
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Zhang, Liyan
;
Hsu, Kuei-Chu
;
Hu, Lili
;
Chi, Sien
A novel diffractive-pumping scheme is proposed to improve the evanescent amplification using blazed fiber grating for the first time. We also investigate the cw-pumped-evanescent amplification at 1.55 mu m wavelength with the relative optical gain pumped at 1480 nm of around 2 dB based on side-polished fiber with the effective interaction length as long as 16 mm and with a heavily Er3+-doped (N-Er(3+) > 1.19 x 10(21) ions/cm(3)), low refractive index (n(1550) < 1.47) glass overlay, which has no concentration quenching (tau(f) = 9.0 ms).
High Er3+ concentration low refractive index fluorophosphate glass for evanescent wave optical amplifiers
(2008-10-01)
Zhang, Liyan
;
Chen, Nan-Kuang
;
Hu, Lili
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光電工程學系
;
Department of Photonics
This is about the first reported laser glass with very low no, high Er3+ concentration and no quenching. In this work, a series of high Er3+ concentration (10.6-12.2 x 10(20) ions/cm(3)), low refractive index (n(1550) < 1.47) and relatively high fluorescence lifetime (6.8-12.6 ms) fluorophosphate glasses were made. A cw-pumping evanescent wave optical amplifier experiment was performed with it, and a relative gain of around 2dB at 1550 nm wavelength was achieved while the noise level was almost unchanged. To our knowledge, this is the first successful relative gain in evanescent wave optical amplifiers (EWOA) demonstrated with cw pumping. It is a valuable study of specially designed fluorophosphate glass suitable for EWOA communication experiment. (C) 2008 Elsevier B.V. All rights reserved.