A waveguide type optical frequency comb (WG-OFC) generator was develop
ed at 1.56 mum wavelength region by utilizing a waveguide type phase m
odulator. It was confirmed that the envelope of sideband spectra had a
width of 2.7 THz and the slope of the envelope profile was 28/dB/THz.
The maximum measurable frequency difference, limited by the shot nois
e, was estimated to be 3.2 THz.