Eminger was selected with the 12th pick in the 2002 NHL Entry Draft by the Washington Capitals and made his debut the following season by playing in 17 games. He spent five seasons with the Capitals before splitting 2008-09 between Philadelphia, Tampa Bay and Florida, combining for five goals and 26 points in 71 games.
"Steve Eminger brings a physical presence to our blue line and is very capable offensively," Ducks Executive Vice President and General Manager Bob Murray said. "Being only 25 years old, we expect him to continue improving as a player and make a solid contribution this season."
For his career, Eminger has 11 goals and 69 points in 283 regular-season games. He also scored a goal in five games for the Capitals during the 2008 Stanley Cup Playoffs.
"He's a guy everyone likes and a good player. Any time you have a chance to get a defenseman that's 25 and has played 300 games, you try to get them," Ducks Senior Vice President of Hockey Operations David McNab said.
"We think he's a good fit for our team. He's going to play and play a lot. Every time you get a chance to get a good player and he fits your price range, you get him."