研究目的
To propose and demonstrate a dual-wavelength mode-locked fiber laser using a bend-induced-birefringence Lyot-filter as a gain-tilt equalizer to balance the gain competition between two wavelengths.
研究成果
The paper successfully demonstrates a dual-wavelength mode-locked fiber laser operating at 1532 nm and 1556 nm using a bend-induced-birefringence Lyot-filter as a gain-tilt spectral equalizer. This approach simplifies the setup for dual-wavelength mode-locked lasers and has potential applications in dual-comb spectroscopy and terahertz wave generation.
研究不足
The study is limited by the difficulty in precisely controlling the length of polarization maintaining fiber (PMF) in Lyot-filters and the challenge of adjusting the gain tilt for high-quality dual-wavelength mode-locking.
1：Experimental Design and Method Selection:
The study employs a ring-cavity configuration using a carbon nanotube (CNT) as the saturable absorber and a bend-induced-birefringence Lyot-filter as a gain-tilt spectral equalizer.
2：Sample Selection and Data Sources:
A segment of
3：5-m-long erbium-doped fiber (EDF) is used as the gain medium, pumped by a 980 nm laser diode. List of Experimental Equipment and Materials:
Includes a 980/1550 wavelength-division multiplexer (WDM) fused coupler, polarization insensitive isolator (PI-ISO), polarization controller (PC), polarizer, and a section of 25-m-long single-mode fiber (SMF) bent in a 13 cm diameter coil.
4：Experimental Procedures and Operational Workflow:
The laser output is measured using an optical spectrum analyzer (OSA) and an oscilloscope with a 5 GHz photodiode.
5：Data Analysis Methods:
Spectral and temporal characteristics are analyzed to determine the performance of the dual-wavelength mode-locked laser.
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