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Degradations in Gbit/s DFB laser transmission systems due to phase-to-intensity noise conversion by multiple reflection points

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4 Author(s)
Gimlett, J.L. ; Bell Commun. Res., Red Bank, NJ ; Young, J. ; Spicer, R.E. ; Cheung, N.K.

Severe system degradations and bit error rate floors are observed in Gbit/s fibre transmission systems due to the interferometric conversion of laser phase noise to intensity noise by multiple reflections from connectors and splices. Studies of penalties as a function of both the magnitude and number of reflections indicate that fibre joints with guaranteed minimum return losses of better than 20 dB may be required for high-speed direct detection systems as well as future coherent systems, even though optical isolators may be employed in such systems

Published in:

Electronics Letters  (Volume:24 ,  Issue: 7 )