  We present a simple, and robust method for writing long period fiber gratings
with low polarization dependent losses. Our method is based on utilizing
mechanical vibrations of the tapered fiber while pooling it. Our method enables
real-time tunability of the periodicity, efficiency and length of the grating.
We also demonstrate complex grating by writing multiple gratings
simultaneously. Finally, we utilized the formation of the gratings in different
fiber diameters to investigate the Young's modulus of the fiber.
