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We present the design of a compact optical clock based on the $^2S_{1/2}\rightarrow ^2D_{3/2}$ 435.5 nm transition in $^{171}$Yb$^+$. The ion trap willbe based on a micro-fabricated circuit, with surface electrodes generating atrapping potential to localize a single Yb ion a few hundred $\mu$m from theelectrodes. We present our trap design as well as simulations of the resultingtrapping pseudo-potential. We also present a compact, multi-channel wavelengthmeter that will permit the frequency stabilization of the cooling, repumpingand clear-out lasers at 369.5 nm, 935.2 nm and 638.6 nm needed to cool the ion.We use this wavelength meter to characterize and stabilize the frequency ofextended cavity diode lasers at 369.5 nm and 638.6 nm.

Compact Yb$^+$ optical atomic clock project: design principle and current status