研究目的
To propose and demonstrate a tunable self-excited multiwavelength Brillouin-erbium fiber laser based on a novel in-line Mach–Zehnder interferometer sensor (NMZIS) with variable temperature.
研究成果
A novel self-excited BEFL based on a NMZIS has been proposed and experimentally demonstrated. The NMZIS acts as a filter and sensing component simultaneously, enabling the stable generation of up to 21 Stokes lines with a 12 nm tuning range and an average OSNR of more than 25 dB. The BEFL is noted for its simple configuration, stability, tunability, and cost-effectiveness.
研究不足
The number of generated Brillouin–Stokes signals decreases progressively from 21 to 14 as the ambient temperature increases from 30 °C to 90 °C. The tuning process, while continuous, is influenced by the temperature characteristics of the NMZIS.
1：Experimental Design and Method Selection:
The experiment involves the design of a NMZIS as a fiber filter within a BEFL cavity to achieve tunable multiwavelength output. The NMZIS consists of a section of uncoated single-mode fiber sandwiched between an up-taper and multimode fiber.
2：Sample Selection and Data Sources:
The NMZIS is subjected to temperature changes from 30 °C to 90 °C to observe its transmission spectrum shifts.
3：List of Experimental Equipment and Materials:
A broadband light source (BBS), an optical spectrum analyzer (OSA, YOKOGAWA AQ6375), a temperature-controlled chamber, a single-mode fiber (SMF-28) coil, a 13 m Er-doped fiber (EDF), a 980/1550 nm WDM, an optical isolator (ISO), two polarization controllers (PCs), and a 10/90 optical coupler.
4：Experimental Procedures and Operational Workflow:
The NMZIS is placed in a temperature-controlled chamber, and its transmission spectra are recorded as temperature is varied. The NMZIS is then embedded in the BEFL cavity to act as a filter, and the output multiwavelength comb is observed.
5：Data Analysis Methods:
The transmission spectra and the output multiwavelength comb are analyzed for wavelength shifts, number of Brillouin–Stokes lines, and optical signal-to-noise ratio.
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optical spectrum analyzer
AQ6375
YOKOGAWA
Used for wavelength monitoring with a resolution of 0.01 nm.
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single-mode fiber
SMF-28
Provides nonlinear gain in the BEFL cavity.
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Er-doped fiber
Provides linear gain in the BEFL cavity.
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WDM
980/1550 nm
Couples the 980 nm pump laser light into the EDF.
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optical isolator
ISO
Prevents light from being reflected back into the cavity.
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polarization controller
PC
Adjusts the polarization state of the laser.
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optical coupler
10/90
Leads out 10 percent of the laser light for wavelength monitoring and returns the remaining 90 percent to the cavity.
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