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Photonics 2017, 4(2), 22;

LCoS SLM Study and Its Application in Wavelength Selective Switch

ERC, Huawei Technologies Duesseldorf GmbH, Riesstrasse 25, D-80992 Munich, Germany
Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen 518129, China
Universidad de Alicante, Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, P.O.Box 99, E-03080 Alicante, Spain
Author to whom correspondence should be addressed.
Received: 12 February 2017 / Revised: 14 March 2017 / Accepted: 18 March 2017 / Published: 23 March 2017
(This article belongs to the Special Issue Optical Networks for Communications)
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The Liquid-Crystal on Silicon (LCoS) spatial light modulator (SLM) has been used in wavelength selective switch (WSS) systems since the 1990s. However, most of the LCoS devices used for WSS systems have a pixel size larger than 6 µm. Although there are some negative physical effects related to smaller pixel sizes, the benefits of more available ports, larger spatial bandwidth, improved resolution, and the compactness of the whole system make the latest generation LCoS microdisplays highly appealing as the core component in WSS systems. In this review work, three specifications of the WSS system including response time, crosstalk and insertion loss, and optimization directions are discussed. With respect to response time, the achievements of liquid crystal material are briefly surveyed. For the study of crosstalk and insertion loss, related physical effects and their relation to the crosstalk or insertion loss are discussed in detail, preliminary experimental study for these physical effects based on a small pixel LCoS SLM device (GAEA device, provided by Holoeye, 3.74 µm pixel pitch, 10 megapixel resolution, telecom) is first performed, which helps with predicting and optimizing the performance of a WSS system with a small pixel size SLM. In the last part, the trend of LCoS devices for future WSS modules is discussed based on the performance of the GAEA device. Tradeoffs between multiple factors are illustrated. In this work, we present the first study, to our knowledge, of the possible application of a small pixel sized SLM as a switching component in a WSS system. View Full-Text
Keywords: phase only liquid crystal on silicon (LCoS); spatial light modulator (SLM); wavelength selective switch (WSS); computer-generated hologram (CGH); crosstalk phase only liquid crystal on silicon (LCoS); spatial light modulator (SLM); wavelength selective switch (WSS); computer-generated hologram (CGH); crosstalk

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Wang, M.; Zong, L.; Mao, L.; Marquez, A.; Ye, Y.; Zhao, H.; Vaquero Caballero, F.J. LCoS SLM Study and Its Application in Wavelength Selective Switch. Photonics 2017, 4, 22.

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