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Effects of Back-Reflection in WDM-PONs Based on Seed Light Injection

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4 Author(s)
Jung-Hyung Moon ; Korea Adv. Inst. of Sci. & Technol., Daejeon ; Ki-Man Choi ; Sil-Gu Mun ; Chang-Hee Lee

We investigate the effects of back-reflection in wavelength-division-multiplexing passive optical networks having an injected seed light for color-free operation of an optical network unit. The back-reflection-induced penalty is reduced as the linewidth of the seed light is increased. The wavelength-locked Fabry-Perot laser diode to an injected spectrum-sliced amplified spontaneous emission light shows a high robustness on the back-reflections, while a coherent seed light exhibits a high-reflection-induced penalty. We also estimate the maximum allowable fiber loss according to the linewidth of the seed light.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 24 )