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The authors show by experiment and calculation that, for self pulsating laser diodes synchronised to external electrical signals, a phase shift exists between the applied signal and the laser output. The authors then show that this phase shift depends on the frequency difference between these signals and on the applied signal amplitude.
Egan, A., O'Gorman, G., Rees, P., Farrell, G., Hegarty, J., Phelan, P.: Frequency dependence of phase difference between synchronised self-pulsating laser emission and injected periodic signals. Electronic Letters, May, 1995, Vol.31, no. 10, pp.802-803.