Multimode Si-wire waveguides for integrated optical delay lines

A delay line of multimode Si-wire waveguide folded with 45° mirror bends is described. A 17 cm waveguide with a core size of 1×3 µm2 was integrated in an area of 0.85 mm2. The waveguide generated a constant group delay of 2 ns in the entire C-band with a typical optical loss of 14 dB. It also exhibited an error-free operation for 10 Gbit/s optical data signals.