Noise characteristics of Er3+‐doped fiber amplifiers pumped by laser diodes

The noise characteristics of the Er3+-doped optical fiber amplifier pumped by laser diodes (LD) at 0.98 μm and 1.48 μm are theoretically and experimentally studied. The noise figures of the optical fiber amplifiers pumped by a 0.98–μm band LD and a 1.48–μm band LD estimated from the beat noise between the signal noise and the spontaneous emission were 3.2 and 4.1 dB. It was found that the beat noise between spontaneous emissions and the shot noise of the spontaneous emission were smaller in the 0.98 μm-band LD than in the 1.48–μm band LD. From these results, it was found that the optical fiber amplifier pumped by the 0.98–μm band LD has lower noise characteristics than those of the amplifier pumped by the 1.48 μm band LD. Further, the signal gain dependence, fiber length dependence and signal wavelength dependence of each noise component were studied. When the signal gain is kept constant, each noise component is not dependent on the fiber length and can be reduced monotonically by increasing the signal gain. When the wavelength deviates from the signal wavelength giving the maximum signal gain, the beat noise between the spontaneous emissions and the shot noise of the spontaneous emission increase.

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