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Optical Engineering

Gain and noise figure characteristics of an Er3+–Yb3+ doped phosphate glass waveguide amplifier with a bidirectional pump scheme and double-pass configuration
Author(s): Gongwang Shao; Guoliang Jin; Qu Li
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Paper Abstract

The net gain (Gnet) and internal noise figure (INF) characteristics of an Er3+–Yb3+ doped waveguide amplifier (EYDWA) with a bidirectional pump scheme and double-pass configuration (DPC) were analyzed both experimentally and numerically. A propagation-rate-equation model was used to describe the eight-level EYDWA system. The EYDWAs used in the experiments were fabricated on an Er3+–Yb3+ doped phosphate glass waveguide of 3.8-cm length using a two-step ion exchange. In comparison with the backward-pump-only scheme (BPOS), the equalizing bidirectional pump scheme (EBPS) achieved a 4.1-dB enhancement in Gnet, while the forward-pump-only scheme (FPOS) achieved a 6.0-dB reduction in the INF with a single-pass configuration (SPC) and 90-mW total pump power. About a 100% enhancement in the Gnet and 50% less deterioration in the INF were obtained in DPC compared with SPC under saturation pump power. A 4.1-dB enhancement in Gnet and a 1.4-dB reduction in INF were observed by applying EBPS instead of BPOS or FPOS with 150-mW total pump power in DPC. Both the experiments and simulations showed that a significant improvement in the performance of the EYDWA can be achieved by optimizing the amplification configuration and pump scheme.

Paper Details

Date Published: 1 October 2008
PDF: 7 pages
Opt. Eng. 47(10) 104201 doi: 10.1117/1.3000591
Published in: Optical Engineering Volume 47, Issue 10
Show Author Affiliations
Gongwang Shao, Shanghai Jiao Tong Univ. (China)
Guoliang Jin, Shanghai Jiao Tong Univ. (China)
Qu Li, Shanghai Jiao Tong Univ. (China)


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