首页|Low-loss tunable add–drop filter assembled by whispering gallery mode microbubble resonator and biconical directional coupler
Low-loss tunable add–drop filter assembled by whispering gallery mode microbubble resonator and biconical directional coupler
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NSTL
Elsevier
? 2021A low-loss tunable add–dropfilter (LTADF) was analyzed in the theory in detail and demonstrated in an experiment, which was assembled by a whispering gallery mode (WGM) microbubble resonator (MBR) and biconical directional coupler (BDC). This scheme not only reduces the coupling loss by reducing the number of coupling points, replacing the traditional dual-coupling point configuration but also improves the mechanical stability of the system. Therefore, the device overcomes the loss caused by multipoint coupling and pattern mismatch. The LTADF configuration with a bandwidth of 7 GHz and an extinction ratio (ER) of more than 15 dB is realized using a high-Q-factor (～1e5) MBR cavity single-edged coupled with BDC. In addition, the transmission spectrum of the LTADF can be tuned by adjusting the axial and radial relative position between BDC and MBR. The pattern of interference in the transmission spectrum can be controlled by manipulating the relative position between BDC and MBR. The demonstrated LTADF gains advantages of low loss, narrow band, and tunable bandwidth, which will be helpful for its application in multiplexing systems, modulators, and optical switches.
NSTL
Elsevier
