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Optical radiative crosstalk in integrated photonic waveguides
Optics Letters
|July 1, 2014
Summary
Optical crosstalk in waveguides, caused by scattering from sidewall roughness, significantly impacts performance even in high-quality devices. This study quantines this power exchange and its distance dependence.
Area of Science:
- Photonics and Waveguide Optics
- Optical Engineering
- Materials Science
Background:
- Optical crosstalk is a significant challenge in integrated photonic circuits.
- Scattering from waveguide imperfections is a known source of signal degradation.
- Understanding crosstalk mechanisms is crucial for designing high-performance photonic devices.
Purpose of the Study:
- To experimentally characterize optical crosstalk in waveguides due to scattering.
- To investigate the impact of sidewall roughness on power exchange between waveguides.
- To develop a comprehensive model describing scattering-induced crosstalk.
Main Methods:
- Comprehensive experimental characterization of optical crosstalk.
- Analysis of power exchange between closely placed waveguides.
- Development and application of an electromagnetic model.
- Investigation of higher-order mode excitation and mode decorrelation.
Main Results:
- Strong power exchange due to sidewall roughness observed even in low-loss waveguides.
- A power-law dependence of coupling on waveguide distance was derived and confirmed.
- Scattered light causes higher-order mode excitation.
- Radiative coupling leads to decorrelation between guided modes.
Conclusions:
- Sidewall roughness is a critical factor for optical crosstalk in waveguides.
- The derived power-law model accurately describes scattering-induced coupling.
- Scattering phenomena lead to complex mode behavior and signal decorrelation.
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