AI Article Synopsis
- A new broadband and ultra-compact polarization splitter-rotator is designed using a special bi-layer structure and an asymmetrical directional coupler on a silicon-on-insulator platform, targeting enhanced performance.
- The device achieves impressive metrics, including a 220 nm bandwidth, low cross talk (XT) of -15.85 dB, and an extinction ratio (ER) of less than 19 across a wavelength range of 1400-1700 nm, making it effective for precise optical applications.
- Analysis shows that the device maintains low insertion losses (below 1 dB) despite fabrication variances, making it ideal for fiber connections and integrated circuits needing polarization diversity.
Article Abstract
A broadband and ultra-compact polarization splitter-rotator based on diagonally overlapped bi-layer architecture and an asymmetrical directional coupler is proposed on a silicon-on-insulator platform. By leveraging the structure over supermode theory, a 1-dB bandwidth of 220 nm, extinction ratio (ER) of <19, and cross talk (XT) of <-15.85 within the span of 1400-1700 nm and coupling length of 4.62 µm are achieved. In addition, - conversion loss of ∼0.19, ER of 35.88 dB, and XT of -30.46 can be obtained at 1550 nm. The fabrication tolerances are also analyzed, indicating that the insertion losses remain below 1 dB over 1460-1620 nm in terms of width errors and layer-to-layer misalignments within ±10. The results show that the proposed device is very suitable to utilize between fibers and for polarization diversity of on-chip systems for broadband operation as well as ultra-compact integration.
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| http://dx.doi.org/10.1364/AO.470750 | DOI Listing |
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