研究目的
To present a switchable and tunable multi-wavelength erbium-doped fiber laser based on a spectral filter formed by polymer and silicon layers at the tip of an optical fiber.
研究成果
A switchable, tunable and highly stable multi-wavelength EDFL based on a spectral filter is demonstrated. The lasing wavelengths are determined by a filter composed of two thermal layers, a Si wafer and a cyanoacrylate layer. Multi-wavelength and switching operation are achieved by changing the intracavity losses with a variable optical attenuator. Then, single-, dual-, triple-, and quadruple-wavelength lasings in the long operation, spanning ~1526–~1565 nm, were achieved by properly adjusting the attenuator. Finally, the multi-wavelength laser emissions can be tuned by varying the filter temperature.
研究不足
The multi-wavelength laser emissions are limited by the mode competition phenomenon due to the homogeneous broadening of the erbium-doped fiber (EDF) gain medium at room temperature.
1：Experimental Design and Method Selection:
The laser is based on a spectral filter formed by polymer and silicon layers at the tip of an optical fiber. The laser emission wavelengths are determined by the position where the most intense fringes of the reflectivity spectrum of the filter occur. The number of laser emissions is controlled and switched by using a variable optical attenuator inserted into the laser cavity.
2：Sample Selection and Data Sources:
The filter is formed by three stacked layers: a silicon (Si) wafer, a polymer layer and an antireflection coating (AR) at the tip of a pigtailed ferrule.
3：List of Experimental Equipment and Materials:
A pigtailed diode laser emitting at ~980 nm, a wavelength division multiplexer (WDM), an erbium-doped fiber (EDF), a variable optical attenuator (VOA), an optical circulator, a 90/10 coupler, an optical isolator, and an optical spectrum analyzer (OSA).
4：Experimental Procedures and Operational Workflow:
The light of a pigtailed diode laser is coupled to a WDM to pump an EDF, which is spliced to a VOA. The operating wavelength range of the VOA is from 1530–1550 nm. The luminescence is transmitted by the VOA into the port 1 of an optical circulator to port 2 of this, where the interferometric filter is placed. The light reflected by the filter passes from port 2 to port 3 of the circulator, which is spliced to a 90/10 coupler in order to split the light reflected in two outputs.
5：Data Analysis Methods:
The multi-wavelength laser emission is monitored using an OSA with a resolution of 0.02 nm.
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