Petersen has scored 23 points in 65 games with the AHL's Texas Stars this season. He has spent five of his nine years in the NHL with Dallas, including a 39-game stint last season in which he scored five points.
The 34-year-old Peterson has 81 points and 50 penalty minutes in 397 career NHL games.
Just the feel for the direction they were headed and what they're trying to do, it just felt that this is a really good thing for this organization. They've got the pieces. We can put something together and go on a run or two and be together for a while, and I'm really excited about that opportunity. The team we have here has an opportunity to win, and that's the most attractive thing.
— Washington defenseman Matt Niskanen on why he decided to sign with the Capitals