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An add-drop filter (ADF) fabricated using a whispering gallery mode resonatorhas different crosstalks for add and drop functions due to non-zero intrinsiclosses of the resonator. Here, we show that introducing gain medium in theresonator and optically pumping it below the lasing threshold not only allowsloss compensation to achieve similar and lower crosstalks but also tunabilityin bandwidth and add-drop efficiency. For an active ADF fabricated using anerbium-ytterbium co-doped microsphere, we achieved 24-fold enhancement in theintrinsic quality factor, 3.5-fold increase in drop efficiency, bandwidthtunability of 35 MHz and a crosstalk of only 2%.

Tunable add-drop filter using an active whispering gallery mode microcavity