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Compact polarization-independent quasi-adiabatic 2×2 3 dB coupler on silicon
Optics Express
|February 25, 2022
Summary
We developed a polarization-independent 2x2 3 dB coupler on a silicon-on-insulator platform. This compact device offers a wide 75 nm bandwidth, accelerating mode evolution for efficient light splitting.
Area of Science:
- Integrated photonics
- Silicon photonics
- Optical components
Background:
- Polarization-dependent devices limit optical system performance.
- Compact and broadband optical couplers are crucial for integrated photonic circuits.
Purpose of the Study:
- To demonstrate a polarization-independent 2x2 3 dB coupler.
- To achieve efficient light splitting across a broad bandwidth using silicon photonics.
Main Methods:
- Utilized a silicon-on-insulator platform.
- Employed a quasi-adiabatic taper design for the mode evolution/coupling region.
- Engineered accelerated TE mode evolution and TM mode coupling.
Main Results:
- Achieved polarization-independent operation for a 2x2 3 dB coupler.
- Demonstrated a compact coupling region of 11.7 μm.
- Measured a working bandwidth of 75 nm.
Conclusions:
- The quasi-adiabatic taper design enables polarization-independent coupling.
- The developed coupler is suitable for broadband integrated photonic applications.
- This compact device offers significant advantages for optical signal processing.
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