We report on an integrated approach to obtain two color emission from a semiconductor
ring laser with filtered optical feedback. This feedback is realized on-chip by employing
two arrayed waveguide gratings to split/recombine light into different wavelength chan
nels. Semiconductor optical amplifiers are used in the feedback loop to control the feed
back strength of each wavelength channel independently. Results show that the effective
gain of the d(tferent anodes is the key parameter which has to be balanced to obtain two
color emission. This can be aclueved by tuning the injection current in each amplifie
