Carter was hammered as he made a spectacular catch in the end zone in the third quarter. As he walked by the Ottawa bench, he bumped into head coach Rick Campbell, knocking him over.
The Redblacks rushed to Campbell's defence, throwing slaps and shots at Carter, who continued his celebration straight through the Ottawa bench area to his own bench, which is on the same side of the field. Carter and Ottawa defensive back Jerrell Gavins were ejected from the game.
The Alouettes fined Carter for the incident on Thursday.
"To tell the truth, I don't even know what happened,'' Carter said after the game. "I ran into the coach, apparently.
"I didn't even know I knocked him over. It's an emotional game. I'm excited. I got hit. I got a cut on my face from that hit. You tell me.''
The Alouettes have a bye this week, so Carter will miss Montreal's home game against Hamilton on July 15.
The CFL also fined Gavins for punching an opponent and for an inappropriate gesture towards fans following his ejection.
Campbell was also fined after the league determined he didn't do enough to avoid contact with Carter.
Redblacks safety Jermaine Robinson was fined for the high hit to Carter that started the incident.