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Absorption of reflected substrate modes in Ti:LiNbO(3) waveguide systems.
Optics Letters
|August 25, 2009
Summary
Absorbing, multilayer interference coatings on lithium niobate (LiNbO3) substrates significantly reduce unwanted optical reflections. This advancement improves integrated optical spectrum analyzers operating at 830 nm across various angles.
Area of Science:
- Optoelectronics
- Materials Science
- Integrated Optics
Background:
- Integrated optical spectrum analyzers (IOSAs) are crucial for signal processing.
- Reflected substrate modes in LiNbO3 substrates can degrade IOSA performance.
- Minimizing these modes is essential for efficient device operation.
Purpose of the Study:
- To develop an optical system that reduces reflected substrate modes in IOSAs.
- To investigate the effectiveness of absorbing, multilayer interference coatings for this purpose.
- To assess performance across a broad range of incident angles at 830 nm.
Main Methods:
- Application of absorbing, multilayer interference coatings to the back sides of LiNbO3 substrates.
- Fabrication of an optical system incorporating these coated substrates.
- Experimental evaluation of the optical system's performance in an IOSA context.
Main Results:
- Substantial reduction in reflected substrate modes was achieved.
- The optical system demonstrated effectiveness over a broad range of incident angles.
- Performance was specifically validated for devices operating at 830 nm.
Conclusions:
- Absorbing, multilayer interference coatings are effective in mitigating reflected substrate modes.
- This technique offers a viable solution for enhancing the performance of LiNbO3-based IOSAs.
- The developed optical system provides improved signal integrity for optical spectrum analysis.
