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Proceedings Paper

Low-cost technique for gain and noise figure measurement of erbium-doped fiber amplifiers using a broadband source and filter tuning
Author(s): Sanjay Gupta; Li Qian
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Paper Abstract

We report a unique low-cost technique for broadband gain and noise figure characterization of erbium-doped fiber amplifiers using an amplified-spontaneous-emission (ASE) source and a tunable filter with multiple steep slopes. The filter edge is tuned in steps of 10 pm and a series of output versus input power spectral density data points are taken at a fixed wavelength. Gain and noise figure of the amplifier are obtained by extracting the slope and intercept of output versus input power spectral density. The results obtained over a 20 dB total input power range are in good agreement (within ± 0.2 dB) with those obtained using conventional spectral-interpolation technique employing multiple DFB lasers at 100 GHz spacing over the C-band. The required filter depth is about 35 dB. Our method has several major advantages: (1) Low cost, as there is no need for multiple DFB laser sources or high-speed AOM modulators and RF drivers; (2) Immune to steady-state noise in the source; (3) Can be used to characterize amplifiers with fast dynamics as its accuracy is in principle not affected by the response time of the amplifying medium.

Paper Details

Date Published: 20 December 2004
PDF: 8 pages
Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.566974
Show Author Affiliations
Sanjay Gupta, Univ. of Toronto (Canada)
Li Qian, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 5577:
Photonics North 2004: Optical Components and Devices
John C. Armitage; Simon Fafard; Roger A. Lessard; George A. Lampropoulos, Editor(s)

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