undercoupling

From under- +‎ coupling.

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undercoupling (uncountable)

1. (electrical engineering) The act of coupling two tuned transformers so as to create a narrower bandwidth.
   • 181105 (2016), Motoki Asano, Şahin Kaya Özdemir, Weijian Chen, Rikizo Ikuta, Lan Yang, Nobuyuki Imoto, Takashi Yamamoto, “Controlling slow and fast light and dynamic pulse-splitting with tunable optical gain in a whispering-gallery-mode microcavity”, in Appl. Phys. Lett.‎^[1], volume 181105:

     We observe continuous transition of the coupling between the fiber-taper waveguide and the microresonator from undercoupling to critical coupling and then to overcoupling regimes by increasing the pump power even though the spatial distance between the resonator and the waveguide was kept fixed.

• overcoupling