1. In an 8- to 10-quart pan over high heat, stir bell pepper, onion, garlic, and oil until onion is limp, about 5 minutes. Add broth, 1 cup water, and fettuccine. Stir often until pasta is just firm to bite, 8 to 10 minutes.
2. Add corn, beans, turkey, and salsa. Stir until soup is simmering, about 3 minutes. Mix in cilantro, lime juice, and orange juice. Ladle into bowls and add salt and pepper to taste.