As stated before, if the interaction is significant, ignore the main effect of these factors and only present the interaction plot. Since the factor “Fiber alignment” has no interaction with other factors, the main effect plot of “Fiber alignment” is meaningful. Thus, the interaction plot of “Lens placement” and “Laser placement”, interaction plot of “Laser placement” and “Laser facet power”, and main effect plot of “Fiber alignment” should be displayed. Plots for the main effects and the interaction effects can be obtained by clicking Stat ÆDOE ÆFactorial ÆFactorial Plots. In the dialogue box, check Main Effect Plotsand Interaction Plots. -Click Setupbutton for Main Effect Plot. In the dialogue box appears, select “Optical output power” for Responsesand “Fiber alignment” for Selectedfactor. Then Click OK. Note thatmultiple main factors’ effect plot can be setup in the dialogue box although in this example only one factor is displayed. -Click Setupbutton for Interaction Plot. In the dialogue box appears, select “Laser facet power” and “Laser placement” for Selected factors.Then Click OK. -Click OK again to obtain the plots. -Following same procedure, another interaction plot, “Lens placement” vs. “Laser placement” can be obtained.
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