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Pulsed-ASE-seeded DWDM optical system with interferometric noise suppression.
Yoo, Sang-Hwa,Moon, Sang-Rok,Kye, Myeonggyun,Lee, Chang-Hee Optical Society of America 2014 Optics express Vol.22 No.7
<P>We propose and demonstrate a 10-Gb/s dense wavelength-division-multiplexing (DWDM) optical system based on a pulsed-seed-light source employing a fiber-based Mach-Zehnder interferometer (F-MZI) as an intensity noise suppressor. The transmission results show that the required injection power into a reflective modulator was as low as -18 dBm. The F-MZI can accommodate the polarized seed-light with superior noise characteristics so that the supported DWDM systems double using a single conventional unpolarized seed-light. In addition, an allowable length of the drop fiber is investigated to show the system flexibility.</P>
Feed Forward Noise Suppression for ASE-Seeded WDM Systems
Sang-Rok Moon,Sang-Hwa Yoo,Myeonggyun Kye,Chang-Hee Lee IEEE 2016 Journal of Lightwave Technology Vol.34 No.9
<P>We investigate feed forward noise suppression for ASE-seeded WDM systems in relation to its limitations. In particular, limitation factors such as background ASE of reflective light sources and filtering effect are thoroughly investigated. We also measure the penalty induced by feed forward parameter variation from the designed value. Although the BER performance is improved by noise suppression, the statistical noise distribution change reduces the effectiveness of noise suppression.</P>