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The 2 {\mu}m waveband is an area that could have significant technologicalconsequences, with applications ranging from spectroscopy, LIDAR and free-spacecommunications. The development of the thulium-doped fiber amplifier,hollow-core photonic bandgap fiber and 2 {\mu}m GaSb-based diode lasers hashighlighted the ability of the waveband in alleviating the fiber capacitycrisis in the incumbent communication infrastructure. The above has initiatedvibrant development in the silicon photonic-space at 2 {\mu}m, where the areais capable of enabling highly-integrated photonic circuits, and potentially atlow-cost and high-volumes. However, as of now, modulator linearity at 2 {\mu}mhas not been addressed. The metric, as characterized by spurious free dynamicrange is imperative for numerous applications such as RF photonic links for 5Gand digital analog transmission in coherent communications. The development oflinear optical modulators will be crucial in bringing these applications to the2 {\mu}m. In view of that, this work is the first to address modulatorlinearity at the 2 {\mu}m, where the ring-assisted Mach-Zehnder modulator isdeveloped, indicating spurious free dynamic range as high as 95 dB.Hz^2/3. Itis found that that modulator spurious free dynamic range has a strongdependence on modulator bias voltage where it impacts the linearity of thetransfer function in which the input RF signal is applied upon. Thedemonstrated modulator indicates favorable performance within silicon photonicmodulators developed at 2 {\mu}m with bandwidth exceeding 17.5 GHz andmodulation efficiency ranging from 0.70 to 1.25 V.cm.

Linear Optical Modulators for Prospective Communications at the 2 {\mu}m Waveband