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Direct bandwidth measurement of multimode waveguides based on an optical sampling technique
Optics Letters
|October 1, 2021
Summary
We present a novel optical sampling method for direct bandwidth measurement in polymer waveguides. This technique accurately characterizes waveguide performance, revealing bandwidth reductions due to higher-order mode stimulation.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Multimode polymer waveguides are crucial for optical communication.
- Accurate bandwidth measurement is essential for device characterization and performance optimization.
Purpose of the Study:
- To demonstrate a direct bandwidth measurement technique for polymer waveguides.
- To investigate the impact of higher-order modes and waveguide structures on bandwidth.
Main Methods:
- Utilized optical sampling technology for direct pulse shape recovery and bandwidth measurement.
- Employed mode scramblers to stimulate higher-order modes in 11-cm polymer waveguides.
- Investigated the effects of waveguide bending and crossing on bandwidth.
Main Results:
- Achieved direct bandwidth measurement of multimode polymer waveguides.
- Observed a reduction in averaged bandwidth (bandwidth-length product) from 241 GHz (27 GHz·m) to 180 GHz (20 GHz·m) with mode stimulation.
- Quantified the influence of waveguide geometry on bandwidth.
Conclusions:
- Optical sampling provides an effective method for measuring waveguide bandwidth and dispersion.
- Higher-order modes significantly impact waveguide bandwidth.
- The technique is applicable to various optical components like waveguides and fibers.
