Optoelectronics Research Centre, University of Southampton, Southampton, UK.
Opt Lett. 2013 May 1;38(9):1533-5. doi: 10.1364/OL.38.001533.
We demonstrate that single polarization, hi-bi fiber DFB lasers are, in general, characterized by elliptical state of polarization (SOP), due to the in-built fiber birefringence axis rotation. Externally applied birefringence axis twist is shown to provide accurate control of the output SOP. Continuous tuning from circular to linear polarization, with polarization extinction ratio of ~40 dB, has been demonstrated.
我们证明了单偏振、高双折射光纤 DFB 激光器通常具有椭圆偏振状态（SOP），这是由于内置光纤双折射轴的旋转所致。实验表明，外部施加的双折射轴扭转可精确控制输出 SOP。我们演示了从圆偏振到线偏振的连续调谐，其偏振消光比约为 40 dB。
