Construction of a matrix-matrix crossbar optical interconnect employing diffractive fan-out and fan-in elements

A. C. Walker, M. R. Taghizadeh, B. Robertson, D. I. McKnight, I. R. Redmond, C. P. Barrett, P. Blair, H. I. White, N. A. Brownjohn, C. Stace, G. M. Proudley, M. I. Birch, W. A. Crossland