Abstract
AbstractAn efficient erbium/ytterbium codoped fiber amplifier is demonstrated by using a dual‐stage configuration with a midway optical isolator and a band‐pass filter (BPF). The amplifier achieved a maximum low signal gain of 54 dB and a corresponding noise figure of 6.5 dB (1536 nm) using the input signal power and total pump power of −50 dBm and 140 mW, respectively. The gain obtained by the amplifier was about 12.5 dB higher than the gain of a conventional single‐stage amplifier whereas its noise figure was 3.5 dB lower. Both isolator and BPF contribute to gain and noise figure improvements by blocking backward and forward propagating amplified spontaneous emission. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2337–2339, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22750
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