Low loss, small crosstalk offset crossing structure for large-scale planar lightwave circuits

A low loss, small crosstalk offset crossing structure for a Si wire waveguide is proposed. We analyzed the properties of the structure for both the TE and TM modes by 2-D FDTD (two-dimensional finite difference time domain) simulation. By optimizing the offset crossing structure, a transmission loss of 0.021dB, and crosstalk of -55.0dB was achieved with a crossing angle of 20 degrees for the TE mode. A transmission loss of 0.070dB, and crosstalk of -48.6dB was also achieved with the same crossing angle for the TM mode. The low losses achieved with a small crossing angle makes this structure very useful for highly integrated optical matrix switches, etc.

[1]  Toshihiko Baba,et al.  Low Loss Intersection of Si Photonic Wire Waveguides , 2004 .

[2]  P. Dumon,et al.  Low-loss, low-cross-talk crossings for silicon-on-insulator nanophotonic waveguides. , 2007, Optics letters.

[3]  Hui Chen,et al.  Low-Loss Multimode-Interference-Based Crossings for Silicon Wire Waveguides , 2006, IEEE Photonics Technology Letters.

[4]  Y. Ikuma,et al.  Low loss, small crosstalk offset crossing structure of si wire waveguide , 2009, 2009 IEEE/LEOS Winter Topicals Meeting Series.

[5]  D. Van Thourhout,et al.  Compact Wavelength-Selective Functions in Silicon-on-Insulator Photonic Wires , 2006, IEEE Journal of Selected Topics in Quantum Electronics.

[6]  M.A. Piqueras,et al.  Low-crosstalk in silicon-on-insulator waveguide crossings with optimized-angle , 2007, 2007 4th IEEE International Conference on Group IV Photonics.