In a shallow plate or glass bowl mix together the non-fat plain yogurt, light-sodium soy sauce, olive oil, lemon juice and ginger. Lay the salmon on top and turn over to coat with the marinade. Cover and set aside for 20-30 minutes.
Remove from the marinade and broil the salmon about 3 inches from the heat until browned on top and cook until just done (4-5 minutes). Remove and place on warm plates. Serve immediately sprinkled with chives if desired.