Optical Design of a Wavelength Selective Switch Utilizing a Waveguide Frontend with Beamsteering Capability

Author:

Patsamanis Georgios12ORCID,Ketzaki Dimitra13,Chatzitheocharis Dimitrios12ORCID,Vyrsokinos Konstantinos12ORCID

Affiliation:

1. Centre for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki, 57001 Thessaloniki, Greece

2. School of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

3. Department of Informatics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

Abstract

Wavelength selective switches (WSSs) are essential elements for wavelength division multiplexing (WDM) optical networks, as they offer cost-effective, high port-count and flexible spectral channel switching. This work proposes a new hybrid WSS architecture that leverages the beam shaping and steering features of uniform silicon nitride-based end-fire optical phased arrays (OPAs). By introducing beamforming to a WSS system, the spectral channels on the liquid crystal on silicon (LCoS) panel can be tailored and arranged properly, depending on the optical configuration, using the beam control capabilities of OPAs. Combining 3D-FDTD and ray tracing simulations, the study shows that, by reducing the input beam dimensions with proper sizing of the OPAs, the WSS design with a null-steering OPA layout and 4 × No switch size features increased spectral resolution. This extensive beamforming study on the steering-enabled layout reveals the acquirement of an even higher input channel number, matching the 8 × No WSS scheme, with flexible channel routing on the LCoS panel. Such implementation of beamsteerers can unlock an extra degree of freedom for the switching capabilities of hybrid WSS devices. The results show great promise for the introduction of OPAs in WSS systems and provide valuable insight for the design of future wireless communication links and WDM systems.

Publisher

MDPI AG

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