Abstract
We measure the frequency-resolved noise figure of fiber optical parametric amplifiers both in phase-insensitive and phase-sensitive modes in the frequency range from 0.03 to 3 GHz. We also measure the variation in noise figure due to the degradation in pump optical signal to noise ratio and also as a function of the input signal powers. Noise figure degradation due to stimulated Brillouin scattering is observed.
Highlights
Noise figure (NF) of an optical amplifier is a critical parameter
All commercially available optical amplifiers such as Erbium-doped fiber amplifiers (EDFAs), semiconductor amplifiers, Raman amplifiers etc., cannot provide NF below 3dB under high gain regime, a limit set by quantum mechanics [2]
To break this barrier of 3-dB NF a lot of research effort has been placed on the so-called phase-sensitive amplifiers (PSAs)
Summary
Noise figure (NF) of an optical amplifier is a critical parameter. Optical amplifiers with low NF are highly sought after components in an optical communication link [1]. All commercially available optical amplifiers such as Erbium-doped fiber amplifiers (EDFAs), semiconductor amplifiers, Raman amplifiers etc., cannot provide NF below 3dB under high gain regime, a limit set by quantum mechanics [2] To break this barrier of 3-dB NF a lot of research effort has been placed on the so-called phase-sensitive amplifiers (PSAs). In χ3 media, PSAs can be constructed by cascading two fiber optical parametric amplifiers (FOPAs) [7] Such a scheme is known as copier-PSA scheme, where the first FOPA creates phase-and frequencylocked waves and second FOPA performs as a PSA. In this study we use strained highly nonlinear fibers (HNLFs) to suppress SBS [15] and work without the need for phase modulation on the pump, and we report, for the first time, frequency-resolved NF measurements for FOPA both in phase-insensitive (PI) and phasesensitive (PS) modes. The results show that the effect of SBS is significant at low frequencies
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