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Stable single-frequency fiber ring laser for 25-GHz ITU-T grids utilizing saturable absorber filter

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6 Author(s)
Han Young Ryu ; Div. of Opt. Metrol., Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea ; Won-Kyu Lee ; Han Seb Moon ; Seung Kwan Kim
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A stable single-frequency fiber ring laser is proposed that operates in a single mode for more than an hour by incorporating unpumped erbium-doped fiber (EDF) as a saturable absorber filter and optimizing the length of EDF used as gain medium. This laser can be continuously tuned to 25-GHz spacing that precisely matches the ITU-T grids by temperature control of etalon filter. This laser had a signal-to-source spontaneous emission ratio higher than 70 dB, and lasing frequencies of 361 channels was matched to ITU-T grids with excellent flatness. Frequency offset from the ITU-T grid was less than 0.14 GHz. The linewidth and the relative intensity noise value was less than 1.3 kHz and 130 dB/Hz (above 250 kHz), respectively.

Published in:

IEEE Photonics Technology Letters  (Volume:17 ,  Issue: 9 )