Raman-amplified pump and its use for parametric amplification and phase conjugation

• Published in: Optical fiber technology Vol. 56; p. 102183
• Main Authors: Gordienko, V., Stephens, M.F.C., Ferreira, F.M., Doran, N.J.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.05.2020
• Subjects: Fiber optical parametric amplification; Raman amplification; Raman-assisted optical phase conjugation; Wavelength conversion; Raman amplification; Fiber optical parametric amplification; Raman-assisted optical phase conjugation; Wavelength conversion
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2020.102183

•High power Raman-amplified pump for parametric processes in arbitrary wavelength band.•EDFA-free fiber optic parametric amplifier (FOPA) with gain up to 24.9 dB over 35 nm.•Raman-assisted phase conjugation/wavelength conversion with efficiency >0 dB over 60 nm. We experimentally demonstrate the use of a discrete Raman amplifier for generating a high power, narrow linewidth pump for use within a fiber optical parametric amplifier (FOPA). We demonstrate the suitability of the Raman-amplified pump for parametric amplification by characterizing its optical signal to noise ratio and relative intensity noise (RIN). The amplified pump is subsequently employed within a FOPA obtaining net gain of up to 24.9 dB and a gain of >11 dB over 35 nm. The approach described here offers the key advantage over traditional EDFA-based pump generation of wavelength tuneability outside the EDFA bands. In principle this allows to place the parametric pump at any wavelength within the low fiber attenuation window. Here we additionally demonstrate Raman-assisted optical phase conjugation to provide positive conversion efficiency over 60 nm whilst employing the phase-conjugating pump power of <10 mW not requiring an amplification by EDFA. We consider this technique to show a significant promise for broadband optical phase conjugation and wavelength conversion as well as the prospect for implementation of these important phenomena outside of the EDFA bands.