Origin of Transient Crosstalk and Its Reduction in Phase-only LCOS Wavelength Selective Switches

The transient crosstalk in a phase-only liquid crystal on silicon (LCOS) based wavelength selective switch using a Fourier transform setup was investigated. Its origin was identified using an in situ test procedure and found to be related to the transient phase patterns displayed by the LCOS device during the switching. Two different methods were proposed to reduce the transient crosstalk without the need to modify the optics or electronics in use. Experimental results show both methods are able to reduce the worst-case transient crosstalk by at least 5 dB.

[1]  N. Uehara,et al.  LCOS-Based Wavelength Blocker Array With Channel-by-Channel Variable Center Wavelength and Bandwidth , 2011, IEEE Photonics Technology Letters.

[2]  Andreas Georgiou,et al.  Multicasting optical interconnects using liquid crystal over silicon devices. , 2011, Journal of the Optical Society of America. A, Optics, image science, and vision.

[3]  Brian Robertson,et al.  Reduction of crosstalk in a colourless multicasting LCOS-based wavelength selective switch by the application of wavefront encoding , 2011, OPTO.

[4]  F. Garcia,et al.  Variable passband optical add-drop multiplexer using wavelength selective switch , 2001, Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551).

[5]  A. Wonfor,et al.  The use of wavefront encoding to reduce crosstalk in a multicasting fiber telecom switch , 2012, OFC/NFOEC.

[6]  Gil Cohen,et al.  WSS technology for the next generation ROADM networks , 2011, OPTO.

[7]  S. Tibuleac,et al.  DWDM transmission at 10Gb/s and 40Gb/s using 25GHz grid and flexible-bandwidth ROADM , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[8]  Xiaohua Ma,et al.  Optical switching technology comparison: optical MEMS vs. other technologies , 2003, IEEE Commun. Mag..

[9]  Timothy D. Wilkinson,et al.  LIQUID CRYSTALS IN TELECOMMUNICATIONS SYSTEMS , 2004 .

[10]  Alex Vukovic,et al.  Multi-degree ROADM based on wavelength selective switches: Architectures and scalability , 2007 .

[11]  G. Dave Morley,et al.  1D MEMS-based wavelength switching subsystem , 2003, IEEE Commun. Mag..

[12]  Roland Ryf,et al.  Wavelength selective switching for optical bandwidth management , 2006, Bell Labs Technical Journal.

[13]  W. Crossland,et al.  Development of Large Capacity and Low-Crosstalk Holographic Switches Using LCOS Spatial Light Modulators , 2002 .

[14]  Timothy D. Wilkinson,et al.  Phase modulation with the next generation of liquid crystal over silicon technology , 2006 .

[15]  N. Collings,et al.  The Silicon Backplane Design for an LCOS Polarization-Insensitive Phase Hologram SLM , 2008, IEEE Photonics Technology Letters.

[16]  Simon Poole,et al.  Flexible and grid-less wavelength selective switch using LCOS technology , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[17]  Brian Robertson,et al.  Use of wavefront encoding in optical interconnects and fiber switches for cross talk mitigation. , 2012, Applied optics.

[18]  D. G. Vass,et al.  Evolutionary development of advanced liquid crystal spatial light modulators. , 1989, Applied optics.

[19]  Tiejun J. Xia,et al.  Flexible architectures for optical transport nodes and networks , 2010, IEEE Communications Magazine.

[20]  Simon Poole,et al.  Technology and Applications of Liquid Crystal on Silicon (LCoS) in Telecommunications , 2013 .

[21]  N. Collings,et al.  The Applications and Technology of Phase-Only Liquid Crystal on Silicon Devices , 2011, Journal of Display Technology.

[22]  Q. Mu,et al.  Advanced single-frame overdriving for liquid-crystal spatial light modulators. , 2012, Optics letters.

[23]  B. Fracasso,et al.  Design and performance of a versatile holographic liquid-crystal wavelength-selective optical switch , 2003 .

[24]  Brian Robertson,et al.  Application of the fractional Fourier transform to the design of LCOS based optical interconnects and fiber switches. , 2012, Applied optics.

[25]  Brian Robertson,et al.  Adaptive beam steering implemented in a ferroelectric liquid-crystal spatial-light-modulator free-space, fiber-optic switch. , 2002, Applied optics.

[26]  D.T. Neilson,et al.  Wavelength-selective 1/spl times/K switches using free-space optics and MEMS micromirrors: theory, design, and implementation , 2005, Journal of Lightwave Technology.

[27]  Gil Cohen,et al.  MEMS wavelength-selective switch incorporating liquid crystal shutters for attenuation and hitless operation , 2013, 2013 International Conference on Optical MEMS and Nanophotonics (OMN).

[28]  Monika Ritsch-Marte,et al.  Speeding up liquid crystal SLMs using overdrive with phase change reduction. , 2013, Optics express.