To prepare Pineapple Salsa, combine pineapple, red and green peppers, cilantro, 1 tablespoon lime juice, red pepper flakes and lime peel in medium bowl.
Spray rack of broiler pan with cooking spray.
Rinse mahi-mahi and pat dry with paper towels.
Place mahi-mahi on rack.
Combine remaining 1 tablespoon lime juice and olive oil; brush on mahi-mahi.
Broil, 4 inches from heat, 2 minutes.
Turn and brush second side with olive oil mixture; sprinkle with white pepper.
Continue to broil 2 minutes or until mahi-mahi flakes easily when tested with fork.