Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2.5
Confusion; Distraction; Situational Awareness; Troubleshooting
No Specific Anomaly Occurred All Types
ATC Equipment / Nav Facility / Buildings
Aircraft X was level at 4;000; Aircraft Y was level at 3;500.  The traffic passed; Aircraft X was allowed to descend once it was well past Aircraft Y.  Once they were about a mile apart and on opposite courses; the conflict alert (CA) activated.When working busy traffic; erroneous conflict alert alarms are distracting and take the controller's focus away from actual traffic situations.  This problem seems to have gotten worse with the implementation of Fusion radar processing at NCT.  These situations should be documented and reviewed to identify problems in the system; and then those problems should be fixed.
NCT Controller reports of aircraft being separated and then after they passed about a mile apart the conflict alert went off.