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Design of a compact silicon-based slot-waveguide crossing
Yin Xu1, Jiayuan Wang, Jinbiao Xiao
1Laboratory of Photonics and Optical Communications, School of Electronic Science and Engineering, Southeast University, Nanjing, China.
Applied Optics
|June 6, 2013
Summary
This study introduces a novel silicon-based slot-waveguide crossing design that significantly reduces crosstalk and radiation loss. The innovative approach achieves low insertion loss and high performance for optical interconnects.
Area of Science:
- Photonics
- Integrated Optics
- Waveguide Technology
Background:
- Efficient optical signal routing is crucial for advanced photonic integrated circuits.
- Minimizing crosstalk and insertion loss in waveguide crossings remains a key challenge.
Purpose of the Study:
- To propose and analyze a novel silicon-based slot-waveguide crossing design.
- To achieve low crosstalk and insertion loss for improved optical interconnects.
Main Methods:
- Design of a slot-to-strip mode converter and a strip-multimode-waveguide (SMW) crossing.
- Utilizing multimode interference (MMI) effect for field convergence.
- Numerical analysis using the finite-difference time domain (FDTD) method.
Main Results:
- Achieved a slot-waveguide crossing with insertion loss (IL) of 0.086 dB, crosstalk (CT) of -35.58 dB, and reflection (RT) of -27.51 dB at 1.55 μm.
- Detailed analysis of IL, CT, and RT concerning structural parameters and wavelength.
- Demonstrated field evolution within the crossing structure.
Conclusions:
- The proposed design effectively reduces crosstalk and radiation loss in silicon-based slot-waveguide crossings.
- The design offers high performance suitable for optical communication systems.
- Fabrication tolerances and performance dependencies are well-characterized.
