Photonics Research, 2017, 5 (4): 04000340, Published Online: Oct. 10, 2018  

Design of low-energy on-chip electro-optical 1  ×  M wavelength-selective switches

Author Affiliations
Department of Engineering, The University of Massachusetts at Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, USA (Richard.Soref@umb.edu)
Abstract
A theoretical design is presented for a 1×M wavelength-selective switch (WSS) that routes any one of N incoming wavelength signals to any one of M output ports. This planar on-chip device comprises a 1×N demultiplexer, a group of N switching “trees” actuated by electro-optical or thermo-optical means, and an M-fold set of N×1 multiplexers. Trees utilize 1×2 switches. The WSS insertion loss is proportional to [log2 (M+N+1)]. Along with cross talk from trees, cross talk is present at each cross-illuminated waveguide intersection within the WSS, and there are at most N 1 such crossings per path. These loss and cross talk properties will likely place a practical limit of N=M=16 upon the WSS size. By constraining the 1×2 switching energy to 1 fJ/bit, we find that resonant, narrowband 1×2 switches are required. The 1×2

Richard Soref. Design of low-energy on-chip electro-optical 1  ×  M wavelength-selective switches[J]. Photonics Research, 2017, 5(4): 04000340.

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