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We report a quick and accurate gain-spectrum measurement technique for broadband (>10THz) Raman and parametric optical amplifiers. Using a depolarized broadband source we predict WDM signal gain experimentally for both single and diverse polarization schemes.
We experimentally characterise discrete Raman amplification by varying pump power, fibre length and signal feedback level. We achieve up to 35dB gain for < 1dB bit error rate penalty using a fibre length of 8.65km.
We have demonstrated that a random distributed feedback based on the Rayleigh scattering provides very flat power-versus-wavelength characteristics both in tunable and multi-wavelength ultra-long fibre lasers.
We experimentally demonstrate a Raman fiber laser with linear cavity based on point-action fibre Bragg grating reflectors and random distributed feedback via Rayleigh scattering in the long fibre providing stable multiple wavelengths (close to ITU grid) output at Watts level.
We present an ultra-long Raman fibre laser amplified system which, with only a single pump wavelength, provides comparable gain flatness and broader spectral bandwidth than a conventional gain flattened C-band EDFA. A 20×42.7Gb/s experiment shows compatibility with DWDM systems.
We demonstrate a fibre laser with a mirrorless cavity that operates via Rayleigh scattering amplified through the Raman effect. The properties of such random distributed feedback laser appear different from those of both traditional random lasers and conventional fibre lasers.
We show experimentally a 57nm gain bandwidth for an ultra-long Raman fiber laser based amplification technique using only a single pump wavelength. The enhanced gain bandwidth and gain flatness is investigated for single and multi-cavity designs.
We study the effect of fibre base and grating profile on the efficiency of ultra-long Raman lasers. We show that for the studied parameters, FBG profile does not affect the performance when operating away from the zero-dispersion wavelength.
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