A stable dual-wavelength fiber laser with tunable wavelength spacing using a polarization-maintaining linear cavity

作者：Liu D^*; Ngo NQ; Dong XY; Tjin SC; Shum P

来源：Applied Physics B: Lasers and Optics , 2005, 81(6): 807-811.

DOI：10.1007/s00340-005-1940-0

We propose and experimentally demonstrate a stable dual-wavelength erbium-doped polarization-maintaining (PM) fiber laser with tunable wavelength spacing using an all-PM linear cavity that makes use of two reflection peaks from the PM fiber Bragg grating (PM-FBG). Experimental results show stable dual lasing lines with a wavelength separation of similar to 0.22 nm and a large optical signal-to-noise ratio (OSNR) of over 40 dB under room temperature. By applying axial strain to the PM-FBG, the center wavelengths of the two lasing lines can be tuned over several nanometers and the wavelength separation between the lasing lines can also be tuned to as small as 0.05 nm, which, to our knowledge, is the smallest wavelength spacing ever obtained from a stable room-temperature dual-wavelength fiber laser. The proposed laser configuration has the advantages of simple structure, low loss, stable dual-wavelength operation and a very small lasing linewidth of similar to 5 kHz .

• 出版日期2005-10
• 单位南阳理工学院