In this paper, we propose and demonstrate a Frequency Modulated Continuous Wave (FMCW) laser source realized through sideband modulation and four-wave mixing (FWM). A silicon waveguide, featuring a reverse-biased P-i-N junction, is designed to excite FWM process. The FWM process in silicon waveguide expand threefold frequency sweeping span to 6 GHz, thereby enhancing spatial resolution to 2.5 cm. The original tuning range of 2 GHz and tuning rate of 0.2 GHz/s is multiplied by three times to 6 GHz and 0.6 GHz/μs respectively. The frequency-modulated light source exhibits excellent linearity, low noise, narrow linewidth, and fast tuning rates, which are critical attributes for modern electrical systems.
With the continuous development of communication systems, the demands on optical transmitters have progressively increased. There is an increasing expectation for these transmitters to be more compact while achieving low power consumption, broad bandwidth, and high environmental stability. Lithium Niobate on Insulator (LNOI) modulators are well-suited to meet these requirements due to lithium niobate's large electro-optical coefficient and the ridge waveguide's strong light confinement, which enables a smaller chip size. In this work, we initially designed the LNOI modulator structure using numerical simulation, and then proceeded with fabrication. After that, we developed a package that integrated the modulator with a III-V semiconductor laser diode via lens coupling and incorporated a Thermoelectric Cooler (TEC) to enhance temperature stability. The small signal test result shows that we have successfully fabricated a transmitter with a 3-dB bandwidth of 44.3 GHz.
In this paper, we propose a structure for flip-chip bonding of the transmission line chip, enabling the connection of high-speed optoelectronic chips with other high-speed chips or RF connectors. The simulation results demonstrate that this structure could achieve excellent RF transmission performance and high process tolerance within the range of 10 MHz to 67 GHz.
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