On the mitigation of optical filtering penalties originating from ROADM cascade

T. Rahman, A. Napoli, D. Rafique, B. Spinnler, M. Kuschnerov, I. Lobato, B. Clouet, M. Bohn, C.M. Okonkwo, H. Waardt, de

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90 Citations (Scopus)


Wavelength selective switches (WSSs) that are integrated in reconfigurable optical add-drop multiplexers (ROADMs) induce penalties on the optical signal due to tight optical filtering, which increases as several ROADMs are cascaded in a meshed network. In this letter, we propose and analyze possible configurations for the mitigation of these penalties in optical domain using optical wave shaper (WS). Including one WS in every ROADM node allows transmission of 28 and 32 GBd signals, which are QPSK, 8-QAM, or 16-QAM modulated, through a cascade of 32 and 14 WSS filters, respectively. With an average bandwidth of 33 GHz per WSS, an optical signal to noise ratio penalty below 1 dB at ${rm BER}=1times 10^{-3}$ is observed.
Original languageEnglish
Pages (from-to)154-157
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number2
Publication statusPublished - 2013


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