A new approach for the complete modal decomposition of the optical fields emerging from the multimode fiber is presented in this paper. Based on the stochastic parallel gradient descent algorithm, mode coefficients for all the bound modes in the multimode fiber can be exactly calculated by utilizing one intensity profile of the beam. Numerical simulation validates the feasibility, and the reconstructed error is below 0.1%. In the case of six modes within the fiber, the running time is about 2 s.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: January 3, 2013
Revised Manuscript: March 13, 2013
Manuscript Accepted: March 23, 2013
Published: April 19, 2013
Haibin Lü, Pu Zhou, Xiaolin Wang, and Zongfu Jiang, "Fast and accurate modal decomposition of multimode fiber based on stochastic parallel gradient descent algorithm," Appl. Opt. 52, 2905-2908 (2013)