Spontaneous emission factor and gain evaluation of an optical amplifier by using noise measurements with no input signal

Philippe Fournier; Bernard Pierre Orsal; Jean-Marie Peransin; Robert M. Alabedra

doi:10.1117/12.201978

22 February 1995 Spontaneous emission factor and gain evaluation of an optical amplifier by using noise measurements with no input signal

Philippe Fournier, Bernard Pierre Orsal, Jean-Marie Peransin, Robert M. Alabedra

Author Affiliations +

Proceedings Volume 2449, Fiber Optic Network Components; (1995) https://doi.org/10.1117/12.201978
Event: Advanced Networks and Services, 1995, Amsterdam, Netherlands

Abstract

The erbium doped fiber amplifier (EDFA) is presently the key element of a long distance transmission. Experimental results of noise characteristics (1 Hz <EQ f <EQ 500 kHz) of an Er³⁺ erbium doped fiber amplifier pumped by 1.48 micrometers laser diode are reported in this paper. Several kinds of noise generated in EDFAs (1/f^(alpha ) noise, 1 <EQ (alpha) <EQ 3; hopping noise, quantum noise) are very troublesome in the various applications of the EDFA. These noise levels impede to improve the optical coherence and the signal to noise ratio. Several studies have been made in order to introduce the low and medium frequency noise for transmitters but nothing yet concerning the EDFA. This communication deals with optical noise simulations of an EDFA. The output noise depends on the amplified spontaneous emission (ASE) power because no input signal is applied. Thanks to a noise simulation, we have been able to deduce the internal gain G of the doped fiber and the spontaneous emission factor n_sp. The correlation between the monitoring photocurrent noise, the output noise and the input noise of the amplifier are given in order to show the influence of the pump laser on the EDFA output and input.

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Philippe Fournier, Bernard Pierre Orsal, Jean-Marie Peransin, and Robert M. Alabedra "Spontaneous emission factor and gain evaluation of an optical amplifier by using noise measurements with no input signal", Proc. SPIE 2449, Fiber Optic Network Components, (22 February 1995); https://doi.org/10.1117/12.201978

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