We propose a novel colorless, directionless and contention-less (CDC) reconfigurable optical add/drop multiplexer (ROADM) that is composed of interconnected wavelength selective switches (WSSs). The key components of this ROADM are interconnected WSSs. Using the connecting branches from WSS to WSS, the channels at any wavelengths from any input may exploit any transponder in the photonic ROADM node. Both of simulation and analytical results showed that when the number of connecting branches (r) equals 2, same blocking performance may be achieved as CDC case (where r equals to N-1). Meanwhile, it achieves significant capital expense saving when compared with other equivalent CDC-ROADMs while assuring 5000 microsecond latency with the First Fit selection algorithm.
Zhao, Li; Sun, Weiqiang; and Hu, Weisheng
"A Colorless, Directionless and Contention-less ROADM that Utilizes Interconnected WSSs,"
Applied Mathematics & Information Sciences: Vol. 09
, Article 60.
Available at: https://dc.naturalspublishing.com/amis/vol09/iss6/60