A compact and broadband polarization beam splitter (PBS) based on silicon (Si) nitride (SiN)-on-Si-on-insulator multilayer platform with vertical asymmetrical directional coupler (ADC) is designed and analyzed. The vertical ADC is consisted of two waveguides, which are placed in the bottom Si layer and upper SiN layer separately. It is found that by properly choosing the values of the structure parameters, especially taking advantages of the extra freedom of the relative location between these two waveguides, the performance of the PBS can be significantly improved. By incorporating tapered structures into the coupling region in the further step, bandwidth of 294 nm, which is determined by the insertion loss of <1 dB and the extinction ratio of >20 dB in both polarizations, is realized within a coupling length as compact as 6.9 μm. The proposed device has a good potential to be applied in three-dimensional photonic integration, where higher integration density or more on-chip functions can be realized.
With the development of the economy and the society, spectrum resources of higher frequencies are becoming increasingly scarce. Beneficial from the photonic technology, optoelectronic oscillators (OEOs) have the advantages in generating microwave signal with high center frequency and low phase noise. However, applications of OEO systems are limited by its bulky size. In this work, a hybrid integrated OEO is proposed and experimentally demonstrated. A high integration level is achieved by assembling all the optical and electrical chips. A compact fiber ring and a YIG filter are also well packaged. At the oscillation frequency of 10 GHz, phase noise of the proposed OEO is -115.83 dBc/Hz@10 kHz. Wideband frequency tuning from 3 GHz to 18 GHz is also realized, the phase noise is better than -110 dBc/Hz @10 kHz at the entire tuning range. This work shows the great potential of integrated OEO in a wide range of applications such as wireless communications and satellite communications.
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