| Title |
Wavelength-Switchable Fiber Bragg grating Laser Using Temperature-Insensitive Spectral polarization-Dependent Loss Element |
| Authors |
Min Seok Kim ; Yong Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2019.33.5.048 |
| Keywords |
Wavelength Switching ; Long-Period Fiber Grating ; Fiber Laser ; Polarization-Maintaining Photonic Crystal Fiber |
| Abstract |
In this paper, we propose a wavelength-switchable fiber Bragg grating (FBG) laser using a temperature-insensitive spectral polarization-dependent loss (PDL) element and two FBGs. The PDL element was fabricated by forming a long-period fiber grating (LPFG) on polarization-maintaining photonic crystal fiber (PMPCF). The two resonance wavelengths of the LPFG inscribed on PMPCF, referred to as the PMPC-LPFG hereafter, were measured as ∼1528.6 and ∼1555.9nm for two orthogonal input polarization states. By considering these two resonance wavelengths, the Bragg wavelengths of the two FBGs, which determine the lasing wavelengths of the FBG laser, were selected as ∼1527.7 and ∼1554.7nm. Because PMPCF used for the spectral PDL element is approximately 30 times less insensitive to temperature than conventional polarization-maintaining fiber, the fabricated PMPC-LPFG can facilitate more stable wavelength switching operation compared with previous fiber lasers employing LPFGs as switching filters. In the fabricated FBG laser, one of the two Bragg wavelengths could be selectively lased by controlling the input polarization state of the PMPC-LPFG with a polarization controller, and the temperature-insensitive wavelength switching operation was experimentally verified in a temperature range of 30-80℃. |