With the augmented use of high performance composite materials in critical structures, it has become increasingly important for ‘smart’ systems to monitor these materials and provide rapid evaluation.  Using fiber Bragg gratings embedded into the weave structure of carbon fiber epoxy composites allows the capability to monitor these composites during manufacture, cure, general aging, and damage.  Fiber optic sensors allow greater insight into damage progression and can be used to verify analytical models.  This paper emphasizes the results of recent work in which multiple arrays of Bragg gratings were placed in the bond line between a composite doubler (repair patch) and an aluminum test coupon that had a crack machined into it.  The sensors were monitored as the test coupon was repeatedly load cycled to failure.  Based on the response of these sensors, algorithms were developed to identify the location of damage and to monitor both the status of the bondline and the status of the underlying crack.