Preheat oven to 375°F (190°C). In large bowl, combine 2 tbsp (30 mL) olive oil, 1 tbsp (15 mL) orange juice, the lemon juice, oregano, cumin, salt, pepper, oranges, onion and cucumber. Gently toss to combine. Cover and refrigerate.
Place salmon in parchment paper-lined baking dish. Drizzle with remaining olive oil and orange juice; season with salt and pepper. Bake 15 min., or until just cooked through.
Plate salmon with orange salad on side to serve.