The Blackhawks announced the deal on Thursday evening.
Pokka was a member of the AHL’s Rockford IceHogs from 2014 to 2018, where he registered 28 goals and 99 assists in 266 games.
DiDomenico, a Woodbridge, Ont. native, had six goals and four assists in 24 games with the Senators this season.
DiDomenico also played in Italy and Switzerland between 2012 and 2017, and helped Team Canada win a gold medal at the 2009 World Junior Championships.