Figure 1
From: Microresonator photonic wire bond integration for Kerr-microcomb generation
Design and characterization of PWBs. (a) SEM micrograph of the PWBs written to the fiber cores of an eight-channel V-groove fiber array. (b) Microscope image showing four PWBs, each with a different extension length: 100 µm, 120 µm, 150 µm and 190 µm respectively. (c) Sub-micron-resolution thermo-reflectance image of a PWB indicating optical power concentration within the loopback. The insert table shows the optical power of PWB failure. (d) Fiber-to-fiber losses through the PWBs in (b) indicating losses \(\sim\) 1.7 dB at 1550 nm for the shortest PWB (blue curve 100 µm length). (e) Finite-element method simulation on the effective index of two TE modes (TE\(_{00}\) is the blue curve, TE\(_{02}\) is the pink curve) within the PWB as a function of cross-sectional geometry (PWB radius) to reach index-matching with MgF2 (green dashed line) at 1550 nm.
