Cook pasta according to package directions except add broccoli the last 3 minutes of cooking. Drain; keep warm.
Meanwhile, for sauce, in a medium saucepan cook and stir sweet pepper and onion in hot butter until tender. Stir in alfredo sauce, milk, and black pepper; heat through. Gently stir in salmon and dill; heat through. Serve sauce over hot pasta. Makes 4 servings.