Abstract
Abstract 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
Highlights
Fiber optical parametric amplifiers (FOPAs) have the potential to enable transmission bandwidth expansion beyond the C and L bands and to breach current capacity limits [1] owing to a fiber optical parametric amplifier (FOPA)’s ability to provide ultra-wide gain and, in principle, to operate at arbitrary wavelengths [2]
The FOPA pump quality was investigated at 1566 nm, the wavelength in proximity of the FOPA gain fiber zero dispersion wavelength (ZDW) and close to an optimal FOPA pump wavelength [7]
The FOPA pump was not distorted by Raman amplification above the level of −40 dB as shown by optical power spectra taken at the input and the output of the Raman gain fiber with resolution of 150 MHz (Fig. 2(b))
Summary
Fiber optical parametric amplifiers (FOPAs) have the potential to enable transmission bandwidth expansion beyond the C and L bands and to breach current capacity limits [1] owing to a FOPA’s ability to provide ultra-wide gain and, in principle, to operate at arbitrary wavelengths [2]. It is beneficial to enable a flexible FOPA operation anywhere between 1310 and 1625 nm where attenuation of modern fibers (i.e. ITU-T G.652.D) can be < 0.4 dB allowing this ~44 THz wide range for signal transmission. FOPA can substantially improve transmission capacity via its implementation for optical phase conjugation (OPC) and wavelength conversion. The improved pump wavelength tuneability is necessary for OPC implementation outside of C and L bands in future optical communications and is beneficial for wavelength conversion flexibility
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