分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： In this paper, a silicon rich nitride-lithium niobate on insulator (SRN-LNOI) hybrid platform with waveguides and several key components is proposed. The propagation loss of the silicon rich nitride-lithium niobate rib-loaded waveguide (1 um x 300 nm) is 2.6 dB/cm at 1550 nm. Passive devices, including adiabatic power splitters, multimode interferometer based splitters, asymmetrical Mach-Zehnder interferometers and Bragg grating filters are fully designed and characterized. Moreover, we report the first demonstration of Mach-Zehnder modulators based on LNOI with high-speed modulation up to 120 GBaud without digital compensation. Hence, the proposed platform enables high performance passive and active devices with low loss, high integration density and complementary metal-oxide-semiconductor technology (CMOS) compatibility, making it a promising candidate for emerging photonics integrated circuits.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： In this paper, an on-chip photonic sampled and quantized analog-to-digital converter (ADC) on thin-film lithium niobate platform is experimentally demonstrated. Using two phase modulators as a sampler and a 5$\times$5 multimode interference (MMI) coupler as a quantizer, an 1 GHz sinusoidal analog input signal was successfully converted to a digitized output with a 20 GSample/s sampling rate. To evaluate the system performance, the quantization curves together with the transfer function of the ADC were measured. The experimental effective number of bits (ENOB) was 3.17 bit. The demonstrated device is capable of operating at a high frequency up to 70 GHz, making it a promising solution for on-chip ultra-high speed analog-to-digital conversion.
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