Abstract
A detailed analysis of the behavior of a DFB fiber laser based on a high-speed tunable intra-cavity phase-shifter is presented. The phase-shifter made of a specially designed shape memory alloy is inducing a birefringence, thus allowing the laser to operate on either x or y polarization mode in the CW regime or in the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -switched regime. The spectral characteristics of the laser are analyzed in detail for both regimes and the cavity properties are derived from the relaxation oscillation frequency.
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