Lin Yang,
Qiaoshan Chen,
Lei Zhang,
Ruiqiang Ji,
and
Fanfan Zhang,
"A Universal Method for Constructing N-port Non-blocking Optical Router Based on 2 x 2 Optical Switch,"
Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9,Page(s)357-361