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(a) Diameter variation of the biconical taper used in our experiment; the center region is magnified in the inset; (b) digitized optical microscope image of the microfiber loop; the inset schematically shows the region of self-coupling where the touching microfiber segments have increasing and decreasing diameters.
Transmission spectra of the MLR in the bandwidth from ; (a) example of beating of oscillations. In the next figures, the region of critical coupling is: (b) at the low-wavelength side, (c) at the center, and (d) at the high-wavelength side of the spectrum band.
Transmission spectra of MLR in the bandwidth from .
Parameters of Eq. (1) fitting the spectra (a),(b),(c),(d), and (e) in Fig. 3.
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