Abstract
We propose an ultrashort and broadband silicon mode-conversion polarization splitter-rotator (PSR) consisting of a taper and a Y-junction both designed by the fast quasiadiabatic dynamics (FAQUAD). The FAQUAD is used to homogeneously distribute adiabaticity over the length of the PSR, providing shortcut to adiabaticity at a shorter device length. The total length of the silicon PSR is 39.2 μm. For a wavelength range from 1.5 μm to 1.6 μm, the PSR exhibits a good performance with > 88% transmission and > 11.4 dB extinction ratio (ER). Simulations also show that the designed devices have good fabrication tolerance.
Highlights
Silicon waveguides based on the silicon-on-insulator (SOI) structure have attracted a lot of attention due to their good mode confinement, enhanced nonlinearity, and compatibility with commercial complementary metal-oxide-semiconductor (CMOS) process [1]
Other polarization splitter-rotator (PSR) based on tapered directional couplers [10], asymmetric directional couplers (ADCs) cascaded with mode-evolution taper [11], mode-evolution taper cascaded with mode-sorting asymmetric Yjunction [12], and adiabatic couplers [13] have been proposed to enhance the robustness, but the device lengths are relatively long due to their adiabatic designs
There is a large body of work on the geometry optimization of photonics devices to improve their performance or functionality
Summary
Silicon waveguides based on the silicon-on-insulator (SOI) structure have attracted a lot of attention due to their good mode confinement, enhanced nonlinearity, and compatibility with commercial complementary metal-oxide-semiconductor (CMOS) process [1]. Other PSRs based on tapered directional couplers [10], ADCs cascaded with mode-evolution taper [11], mode-evolution taper cascaded with mode-sorting asymmetric Yjunction [12], and adiabatic couplers [13] have been proposed to enhance the robustness, but the device lengths are relatively long due to their adiabatic designs. Many short and robust coupled waveguide devices have been designed using STA, such as mode converter [18,19], Y-junctions [20], directional couplers [21,22,23,24], mode (de)multiplexers [25,26], and polarization rotators [27]. Performance degradations due to fabrication imperfections are analyzed, showing that the FAQUAD PSRs have good fabrication tolerance
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