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8 September 2006 Linewidth control in semiconductor optical amplifier based fibre ring lasers
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Proceedings Volume 6343, Photonics North 2006; 63430Q (2006)
Event: Photonics North 2006, 2006, Quebec City, Canada
A novel SOA based fibre ring laser is presented. An S-band optimized SOA is added to the cavity of a C-band SOA fibre ring laser resulting in significant improvements in the ring laser characteristics. Three main linewidth control parameters are identified: 1) Bias current of C-band SOA, 2) Bias current of S-band SOA, and 3) SOP of lasing light in ring's cavity. Experimental measurements suggest the SOP of the lasing light to be the dominant control parameter for reduction or enhancement of the laser's linewidth. An output power level of 5.27 dBm (corresponding to 10.54 dBm cavity power) and less than 20 kHz FWHM (limited by equipment resolution) and 190 kHz 20-dB linewidth at 1558 nm is demonstrated. The measured 20-dB linewidths displayed stronger variations to changes in the bias currents of the ring lasers compared to variations in the FWHM. This suggests that the optical spectrum of the ring lasers becomes asymmetric at high bias currents and is no longer pure Lorentzian.
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Hazem Awad, Ahmad Atieh, and Trevor J. Hall "Linewidth control in semiconductor optical amplifier based fibre ring lasers", Proc. SPIE 6343, Photonics North 2006, 63430Q (8 September 2006);

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