First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal

Toshihiko Hirooka; Keisuke Kasai; Yixin Wang; Masataka Nakazawa; Masaki Shiraiwa; Yoshinari Awaji; Naoya Wada

doi:10.1587/elex.12.20150884

This article has now been updated. Please use the final version.

First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal

Toshihiko Hirooka, Keisuke Kasai, Yixin Wang, Masataka Nakazawa, Masaki Shiraiwa, Yoshinari Awaji, Naoya Wada

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Keywords: Digital coherent transmission, QAM, ROADM

JOURNAL FREE ACCESS Advance online publication

Article ID: 12.20150884

DOI https://doi.org/10.1587/elex.12.20150884

The final version of this article is now available: Vol. 12 (2015), No. 23 pp. 20150884-20150884

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Abstract

We demonstrate the add/drop operation and transmission of 120 Gbit/s (10 Gsymbol/s) polarization-multiplexed (PDM) 64 QAM digital coherent signals in a deployed ROADM network. By equalizing waveform distortions at the ROADM node with an FIR filter, the QAM signal was successfully add/drop-multiplexed, and transmitted over a 50 km ring network testbed with neighboring 9×10 Gbit/s OOK WDM data. This indicates the applicability of digital coherent systems to the deployed ROADM network based on 10 Gbit/s OOK, and its upgradability to 120 Gbit/s PDM-64 QAM.

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