High-extinction electro-optic modulation on lithium niobate thin film

Fabrication of a multifunctional photonic integrated chip on lithium niobate on insulator using femtosecond laser-assisted chemomechanical polish

“…Figure 3b-c present the DC response of our cascaded MZI beam splitter, showing a half wave voltage of 9.7 V and an extinction ratio of ~28 dB. The demonstrated extinction ratio is comparable to the previous results reported in [14,15], and should be able to be improved by refining the experimental conditions. For instance, the current polarization controller used in our experiment may not be able to produce a TE wave of high purity, which may be the main cause of the spoiled extinction ratio of the beam splitter.…”

Rejuvenating a Versatile Photonic Material: Thin‐Film Lithium Niobate

“…However, it is worth mentioning that, recently, by cascading two TFLN MZ EOMs higher ER (up to 53 dB) has been demonstrated. [142] The devices in [80] are fabricated by using a BCB-bonding method of TFLN to SOI waveguides, as depicted in Figure 4. In addition, direct-etching of LN is also employed (see Figure 3h) in order to fully transfer the optical mode from SOI to LN waveguides in the modulator region compared to the partially-transferred optical mode in [76].…”

High-Precision Propagation-Loss Measurement of Single-Mode Optical Waveguides on Lithium Niobate on Insulator

“…The device was composed of three beam splitters aligned in a vertical array, each of which consisting of two identical electro-optic (EO) Mach–Zehnder interferometers (MZIs) bridged by an EO phase shifter. A similar design was used to produce high-extinction-ratio beam splitters immune to fabrication imperfections [26,27]. The beam splitter was fabricated on an X-cut LNOI chip with its optic axis oriented perpendicularly to the MZI arms, as in Figure 4a.…”