研究目的
To demonstrate a multi-wavelength Brillouin fiber laser based on a dual-ring structure to take advantage of the forward and backward Brillouin gain simultaneously with an injected tunable scanning lasing.
研究成果
A multi-wavelength Brillouin fiber laser based on a dual-ring structure was demonstrated. Two erbium-doped fiber amplifiers are used for the amplification of the seed lasing and the operated Brillouin laser. When the laser operates at the center wavelength of 1565 nm, the output spectra shows the maximum Brillouin lines of more than 95 with a wavelength spacing of about 0.08 nm. Through adjusting of the seed wavelength and the tunable filter in cavity, the output spectra can be shifted from 1540 to 1570 nm. The long time stability of the proposed fiber laser has been detected and shows a good fluctuation of less than 0.05 dB.
研究不足
The stability of wavelength and linewidth in single-wavelength BFL are difficult to control. The increasing number of line to generate and injected in multi-wavelength BFL is difficult and the flatness of output spectra is still a challenge.
1：Experimental Design and Method Selection:
A dual-ring structure was used to utilize the forward and backward Brillouin gain simultaneously with an injected tunable scanning lasing. Two erbium-doped fiber amplifiers were used for the amplification of the seed lasing and the operated Brillouin laser.
2：Sample Selection and Data Sources:
A section of 2 km long dispersion-shifted fiber was used as the Brillouin gain fiber.
3：List of Experimental Equipment and Materials:
Tunable scanning laser (TSL, Agilent 81949A), erbium-doped fiber (EDF, Liekki Er110-4/125), wavelength division multiplexer (WDM), isolator (ISO), optical circulator (CIR1, CIR2), 3 dB coupler, tunable band pass filter (TBPF), optical spectrum analyzer, in-line 10 dB fiber optical attenuator (FOA).
4：Experimental Procedures and Operational Workflow:
The TSL was used as the Brillouin pump with the output power of 14 dBm. The EDF was pumped with a 1480 nm pump through a WDM. The amplified BP is launched into the BGF though CIR
5：The first-order Brillouin Stokes signal is generated and propagates anti-clockwise through CIR1 to the 3 dB coupler. The residual BP power propagates clockwise through CIR2 to the 3 dB coupler. Data Analysis Methods:
An optical spectrum analyzer was used to measure the output spectrum with the resolution of 0.05 nm.
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