Use of wavefront encoding in optical interconnects and fiber switches for cross talk mitigation.

A technique of cross talk mitigation developed for liquid crystal on silicon spatial light modulator based optical interconnects and fiber switches is demonstrated. By purposefully introducing an appropriate aberration into the system, it is possible to reduce the worst-case cross talk by over 10 dB compared to conventional Fourier-transform-based designs. Tests at a wavelength of 674 nm validate this approach, and show that there is no noticeable reduction in diffraction efficiency. A 27% spot increase in beam diameter is observed, which is predicted to reduce at longer datacom and telecom wavelengths.

[1]  Wilson,et al.  New modal wave-front sensor: a theoretical analysis , 2000, Journal of the Optical Society of America. A, Optics, image science, and vision.

[2]  T. Wilkinson,et al.  Aberration correction in an adaptive free-space optical interconnect with an error diffusion algorithm. , 2006, Applied optics.

[3]  R. Gerchberg.  A practical algorithm for the determination of phase from image and diffraction plane pictures , 1972 .

[4]  Timothy D. Wilkinson,et al.  Hologram Optimisation Using Liquid Crystal Modelling , 2005 .

[5]  Lars Sjöqvist,et al.  Intensity variations using a quantized spatial light modulator for nonmechanical beam steering , 2003 .

[6]  Jari Turunen,et al.  Electromagnetic theory and design of diffractive-lens arrays , 1993 .

[7]  D.T. Neilson,et al.  256/spl times/256 port optical cross-connect subsystem , 2004, Journal of Lightwave Technology.

[8]  Irene A. Stegun,et al.  Handbook of Mathematical Functions. , 1966 .

[9]  W. Crossland,et al.  Holographic optical switching: the "ROSES" demonstrator , 2000, Journal of Lightwave Technology.

[10]  N Collings,et al.  High Quality Assembly of Phase-Only Liquid Crystal on Silicon (LCOS) Devices , 2011, Journal of Display Technology.

[11]  B Robertson,et al.  Dynamic holography for optical interconnections. II. Routing holograms with predictable location and intensity of each diffraction order. , 2001, Journal of the Optical Society of America. A, Optics, image science, and vision.

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

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

[14]  Haldun M. Özaktas,et al.  The fractional fourier transform , 2001, 2001 European Control Conference (ECC).

[15]  D. Marcuse.  Loss analysis of single-mode fiber splices , 1977, The Bell System Technical Journal.

[16]  Lin Xu,et al.  Influence of phase delay profile on diffraction efficiency of liquid crystal optical phased array , 2009 .

[17]  Z. Zalevsky,et al.  The Fractional Fourier Transform: with Applications in Optics and Signal Processing , 2001 .

[18]  Jay E. Stockley,et al.  Influence of the interpixel region in liquid crystal diffraction gratings , 1999, Electronic Imaging.

[19]  A H Greenaway,et al.  Simultaneous multiplane imaging with a distorted diffraction grating. , 1999, Applied optics.

[20]  Brian Robertson,et al.  Cross-talk analysis in a telecentric adaptive free-space optical relay based on a spatial light modulator. , 2006, Applied optics.

[21]  Thomas P. Minka,et al.  Gates , 2008, NIPS.

[22]  Ming C. Wu,et al.  Optical MEMS for Lightwave Communication , 2006, Journal of Lightwave Technology.

[23]  Jay E. Stockley,et al.  Liquid Crystal Displays II, SPIE v.3635, paper 18, 1999 The Influence of the Inter-pixel Region in Liquid Crystal Diffraction Gratings , 1999 .

[24]  M. Yzuel,et al.  Inherent apodization of lenses encoded on liquid-crystal spatial light modulators. , 2000, Applied optics.