Abstract
Highly nonlinear multimode optical integrated devices hold great promise for the emerging large-capacity mode division multiplexing (MDM) technology, and they correspondingly enable multimode optical signal processing at nodes of the MDM network. Here, we propose a highly nonlinear multimode organic-silicon slot waveguide (HN-OSSW) whose nonlinearity is greatly improved by the intensive optical field confinement in the nano-gaps filled with highly nonlinear organic material. Specifically, the achieved nonlinear coefficients of the HN-OSSW under TE0 and TE1 modes are estimated higher than 7000 W <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> and 5800 W <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> , respectively. Also, by phase mismatch optimization, this nanostructure exhibits superior intramode four-wave mixing conversion efficiency but ignorable intermode crosstalk. Coupling efficiency of the mode multiplexer and the optimal nonlinear interaction length are discussed in detail. Based on the HN-OSSW, we then numerically demonstrate a multimode all-optical hexadecimal addition and subtraction for sixteen phase-shift keying (16PSK) signals with the operation rate of 1.28Tb/s. Six different logic operations including A+B-C, A+C-B, B+C-A, A+B, A-B and B-A are simultaneously obtained with good performance evaluations, indicating the promising prospect of the HN-OSSW applied in ultrafast multimode signal processing.
Highlights
The newly emerging large-capacity optical transmission strategy mode-division multiplexing (MDM) is expected as a viable way to improve the capacity crunch but with a more reasonable cost compared to the optical time division multiplexing (OTDM) and dense wavelength division multiplexing (DWDM) [1]
The SOI multimode slot waveguide can be fabricated by standard electron beam lithography (EBL) and inductively coupled plasma etching (ICP), which are totally compatible with the compatibility with metal-oxide-semiconductor (CMOS) manufacturing platform
Even though one can see some performance degradation associated with the accumulated noise and cascading FWM induced interference, the optical signal-to-noise ratios (OSNRs) and Error vector magnitudes (EVMs) results still indicate that the proposed highly nonlinear multimode organic-silicon slot waveguide (HN-OSSW) is a potentially suitable candidate to enable ultrafast multimode optical computing
Summary
The newly emerging large-capacity optical transmission strategy mode-division multiplexing (MDM) is expected as a viable way to improve the capacity crunch but with a more reasonable cost compared to the optical time division multiplexing (OTDM) and dense wavelength division multiplexing (DWDM) [1]. Multimode optical signal processing based on nonlinear devices is required at nodes of the MDM system. Optical logic operation is one of the crucial methods for optical high-performance computing, exhibiting the outstanding features of parallel processing, ultra-high processing speed and low power consumption It has shown great potential for utilization in optical programmable devices [20], [21] and artificial intelligence [22]. It would be very attractive and meaningful to find an integrated strategy for all-optical multimode logic operation that may further improve the computing efficiency in MDM system. Considering the multimode processing, the computing capacity would be further improved to create a high-performance optical computing
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