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Design of Broadband Flat Optical Frequency Comb Based on Cascaded Sign-Alternated Dispersion Tellurite Microstructure
Guocheng Huang1, Meicheng Fu1, Junli Qi1
1Department of Physics, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China.
Micromachines
|October 23, 2021
Summary
Researchers developed a novel broadband optical frequency comb generation scheme using tellurite microstructure fiber (TMF). This method produces highly coherent combs, ideal for advanced photonics and signal processing applications.
Area of Science:
- Photonics and Optical Engineering
- Nonlinear Optics
- Materials Science
Background:
- Optical frequency combs are crucial for high-precision measurements and advanced signal processing.
- Tellurite microstructure fibers (TMFs) offer unique nonlinear properties for light manipulation.
- Existing methods for generating broadband combs face limitations in bandwidth and coherence.
Purpose of the Study:
- To propose and analyze a novel broadband optical frequency comb generation scheme.
- To investigate the performance of cascaded sign-alternated dispersion TMF (CSAD-TMF) for comb generation.
- To explore the influence of nonlinear effects on ultrashort pulse evolution within the CSAD-TMF.
Main Methods:
- Design of a tellurite microstructure fiber (TMF).
- Development of an electro-optical modulation and CSAD-TMF based comb generation scheme.
- Numerical modeling using generalized nonlinear Schrodinger equations (GNLSE) to analyze ultrashort pulse evolution and nonlinear effects.
Main Results:
- Successful generation of optical frequency combs with a 6 dB spectral bandwidth over 170 nm, centered at 1550 nm.
- Demonstration of highly coherent performance across the entire 6 dB spectral bandwidth.
- Analysis revealed the impact of nonlinear effects and dispersion zones (anomalous and normal) on pulse evolution.
Conclusions:
- The proposed scheme effectively generates broadband and highly coherent optical frequency combs.
- CSAD-TMF is a promising platform for advanced optical frequency comb generation.
- The generated combs are suitable for high-repetition-rate, multi-wavelength light sources in integrated microwave photonics and ultrafast optical signal processing.
