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Published on: March 19, 2016
Characteristics of a multi-mode interference device based on Ti:LiNbO3 channel waveguide.
1Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Republic of Korea. laks@gist.ac.kr
Optics Express
|June 25, 2009
Summary
We analyzed multi-mode interference in Ti:LiNbO3 waveguides, finding wavelength and polarization affect optical signal oscillations. Periodicity depends on the refractive index difference between fundamental and first modes.
Area of Science:
- Photonics and Waveguide Technology
- Optical Physics
- Materials Science
Background:
- Multi-mode interference (MMI) is crucial in integrated optics.
- Titanium-indiffused lithium niobate (Ti:LiNbO3) waveguides are key components in photonic devices.
- Understanding MMI effects is essential for optimizing waveguide performance.
Purpose of the Study:
- To investigate multi-mode interference effects in Ti:LiNbO3 waveguides.
- To analyze the influence of wavelength and polarization on interference patterns.
- To determine the periodicity of optical signal oscillations.
Main Methods:
- Experimental analysis of Ti:LiNbO3 waveguides at approximately 1300 nm.
- Measurement of transmitted optical signal periodicity for TM and TE polarization.
- Theoretical calculations using a quasi-analytical technique.
- Application of the effective-refractive-index method and coupling length equations.
Main Results:
- Observed periodic oscillations in the transmitted optical signal as a function of input wavelength.
- Measured average oscillation periodicity of approximately 18 nm for TM polarization.
- Measured average oscillation periodicity of approximately 48 nm for TE polarization.
- Confirmed that periodicity is determined by the refractive index difference between fundamental and first modes.
Conclusions:
- The study successfully analyzed multi-mode interference in Ti:LiNbO3 waveguides.
- Experimental results align with theoretical calculations based on mode phase factors.
- Findings provide insights into optimizing waveguide design for specific optical applications.
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