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(a) Schematic diagram of the MRR made of two U-bent microfibers and (b) microscopic top view images of the fabricated MRRs.
(a) Optical microscopic images of 632 nm wavelength light traveling through the MRRs.
Transmission spectra for the drop port (output 1) and through port (output 2) in two extreme coupling lengths: (a) 5.7 mm (long racetrack) and (b) zero (circular ring).
Spectral response of the embedded MRR filter at through port, measured for each of the polarization axes.
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