Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate
arxiv(2024)
摘要
On-chip optical filters are fundamental components in optical signal
processing. While rare-earth ion-doped crystals offer ultra-narrow optical
filtering via spectral hole burning, their applications have primarily been
limited to those using bulk crystals, restricting their utility. In this work,
we demonstrate cavity-enhanced spectral filtering based on rare-earth ions in
an integrated nonlinear optical platform. We incorporate rare-earth ions into
high quality-factor ring resonators patterned in thin-film lithium niobate. By
spectral hole burning in a critically-coupled resonance mode, we achieve
bandpass filters ranging from 7 MHz linewidth, with 13.0 dB of extinction, to
24 MHz linewidth, with 20.4 dB of extinction. These filters outperform those of
the highest quality factor ring resonators demonstrated in the thin-film
lithium niobate integrated platform. Moreover, the cavity enables
reconfigurable filtering by varying the cavity coupling rate. For instance, as
opposed to the bandpass filter, we demonstrate a bandstop filter utilizing an
under-coupled ring resonator. Such versatile integrated spectral filters with
high extinction ratio and narrow linewidth could serve as fundamental
components for optical signal processing and optical memories on-a-chip.
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