A stable multiwavelength erbium-doped fiber laser is proposed and demonstrated successfully. Through carefully
adjusting the state of the polarization controller, the stable two three-wavelength with a spacing of 0.8 nm and one four-wavelength
with a spacing of 0.4 nm fiber laser have been obtained. A nonlinear optical loop mirror (NOLM) with 70-m
long Photonic Crystal Fiber (PCF) is employed to ensure stable room-temperature multiwavelength operation. The
measured power fluctuation of each wavelength is less than 0.2 dB and the peak power differences among the main
oscillation wavelengths are less than 1.0 dB. Another desirable characteristic is that it needs a relatively low pump power
of 100 mW. The signal-to-noise ratio is ~35 dB. And it is better than that inserting single-mode fiber (SMF) ever
reported.
Two simple and low-cost methods for achieving selective filling of air-core photonic bandgap fibers (PBGFs) are
proposed and demonstrated. In the first method, liquid paraffin was filled into a PBGF by capillary force. By a two-step
filling-cleaving process, all cladding air-holes are finally blocked but the air-core remains open. In the second method,
lateral erosion method by hydrofluoric acid was first used to make the cladding air-holes laterally open. Then, the
laterally filled liquid paraffin made all cladding air-holes blocked and left only air-core open. With these two methods,
the central hollow-core of the PBGF can be selectively filled, which allows for the fabrication of novel hybrid
functional-material-silica PBGF for various applications.
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