M. Janos et J. Canning, PERMANENT AND TRANSIENT RESONANCES THERMALLY-INDUCED IN OPTICAL-FIBERBRAGG GRATINGS, Electronics Letters, 31(12), 1995, pp. 1007-1009
Arbitrary distributed phase shifts are thermally postprocessed into op
tical fibre Bragg gratings to produce sharp resonances within the stop
band. Growth of both transient and permanent resonances are reported.