研究目的
To propose and prove a femtosecond soliton erbium-doped fiber ring laser with a symmetrical saturable absorber (SA) of graded index multimode fiber-step index multimode fiber-graded index multimode fiber (GIMF-SIMF-GIMF) for achieving femtosecond soliton mode-locking operation and repetition rate tuning.
研究成果
The symmetrical GIMF-SIMF-GIMF structure serves as an effective SA for achieving stable, wide-band femtosecond soliton operation in erbium-doped fiber lasers with tunable repetition rates. The laser demonstrates low mode-locking threshold, good stability, and immunity to external environmental variations.
研究不足
The study does not explore the maximum possible repetition rates beyond 763.36 MHz due to equipment limitations. The long-term stability under varying environmental conditions was not tested.
1：Experimental Design and Method Selection:
The study involves designing a femtosecond soliton erbium-doped fiber ring laser with a symmetrical GIMF-SIMF-GIMF SA based on the nonlinear multimode interference (NL-MMI) effect.
2：Sample Selection and Data Sources:
The SA was fabricated using a fiber fusion splicer with specific lengths of GIMF and SIMF.
3：List of Experimental Equipment and Materials:
Includes a laser diode, wavelength division multiplexer, Erbium-doped fiber, polarization independent isolator, polarization controller, optical coupler, and single mode fiber.
4：Experimental Procedures and Operational Workflow:
The laser's performance was evaluated by measuring the soliton duration, repetition rate, and stability under varying pump powers and polarization states.
5：Data Analysis Methods:
The soliton's characteristics were analyzed using an optical spectrum analyzer, oscilloscope, photo-detector, optical auto-correlator, and frequency spectrum analyzer.
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