A fully integrated optical true time delay (OTTD) module based on optical wavelength router is designed and fabricated. Two 16×16 arrayed waveguide grating routers (AWGR) with channel spacing of 1.6 nm are cascaded with a group of waveguide delay lines to form the module. The experimental result shows that this module has excellent performance, the device crosstalk at working wavelengths is lower than -27 dB, and the insertion loss is about 12 dB at peak wavelength end to end. The optical delay increment of (6.24±0.4) ps is measured experimentally by vector network analyzer. Two AWGR and delay line array of the module are integrated on the silicon substrate. This device is fabricated with silicon dioxide waveguide and the whole size is 3.5 cm×3.5 cm.