Highly accurate method for single-mode fiber laser wavelength measurement

We propose a simple technique by which the wavelength of a single-mode fiber laser can be easily measured to accuracy of the order of 1 pm. The technique is based on the wavelength dependence of polarization mode beating frequencies. Direct application of this method for wavelength stabilization of fiber lasers and the possibility of obtaining information about the polarization mode dispersion of the fiber used within the laser cavity are discussed.