Polarization separation/combination based on self-imaging

An integrated optical device for the separation/combination of orthogonal p olarizations is described. The device relies on simultaneous symmetric and antisymmetric 1 x 1 off-center self-imaging. Calculations show that 90% thr oughput and 0.1 % crosstalk can often be attained, with device length less than or comparable to other integrated optical polarization separation devi ces. The device is passive, requires only a single mask, and is not restric ted to a specific fabrication method or material system. Devices can even b e made in isotropic material systems with a deep etch. Simulation results a re presented for the lithium niobate and glass waveguide material systems. (C) 2001 Society of Photo-Optical Instrumentation Engineers.