Bidirectional-Pumped L-Band Erbium-Doped Fiber Amplifier
with Pump Distribution Technique¹

N. Md. Yusoff^{a, b}, A. F. Abas^a, S. Hitam^a, and M. A. Mahdi^a

^a Wireless and Photonics Networks Research Center, Faculty of Engineering, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia

^b Razak School of Engineering and Advanced Technology, Universiti Teknologi Malaysia International Campus,
Jalan Semarak, 54100 Kuala Lumpur, Malaysia

e-mail: mdadzir@eng.upm.edu.my

Received February 2, 2012; in final form February 21, 2012; published online June 12, 2012

Abstract—A dual-stage erbium doped fiber amplifier (EDFA) having a flat gain wavelength response through-
out L-band transmission window is presented. By applying pump power distribution technique, the pump power
is distributed to two different stages with different length of EDF depending on the coupling ratio. By control-
ling these two parameters, gain of 19.1 dB with small gain variation of less than 0.5 dB and a noise figure of
less than 10.5 dB are achieved in this architecture using bidirectional pumping. However, when another 3 dB
power coupler is added to split the pump power equally at the second stage in bidirectional, a better noise figure
of less than 7.5 dB was obtained. Comparison with a conventional single-stage optical amplifier was made in
order to validate the performances of this dual-stage EDFA.

DOI: 10.1134/S1054660X12070183

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