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Can 40-gb/s duobinary signals be carried over transparent DWDM systems with 50-GHz channel spacing?

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1 Author(s)
Xiang Liu ; Bell Labs., Lucent Technol., Holmdel, NJ, USA

The feasibility of transmitting 40-Gb/s optical duobinary signals over transparent dense wavelength-division-multiplexed (DWDM) systems with a 50-GHz channel spacing and multiple optical add-drop multiplexers (OADMs) is investigated. While the duobinary format is tolerant to passband narrowing, from concatenated filtering by the OADMs, it is very sensitive to the group-delay ripple (GDR) associated with this filtering. We show that GDR must be carefully controlled, e.g., by GDR compensation, before 40-Gb/s duobinary signals can be effectively used in DWDM systems originally designed for 10-Gb/s traffic.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 6 )

Date of Publication:

June 2005

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