Abstract

We report the measurement of full distribution map of guided spatial modes in a PANDA type two-mode fiber (PANDA-TMF) based on optical time-domain analysis of Brillouin dynamic grating (BDG). Six different spatial modes in three mode groups (LP₀₁, LP_11even, and LP_11odd) with x & y polarizations are selectively launched by polarization-maintaining mode-selective couplers (PM-MSC’s) to apply eight different pump-probe pairs (LP₀₁^x-LP_11(e)^x, LP₀₁^x-LP_11(e)^y, LP₀₁^y-LP_11(e)^x, LP₀₁^y-LP_11(e)^y, LP₀₁^x-LP_11(o)^x, LP₀₁^x-LP_11(o)^y, LP₀₁^y-LP_11(o)^x, and LP₀₁^y-LP_11(o)^y) for the intermodal BDG operation. The measured BDG spectra are analyzed to obtain the full distribution map of the spatial mode structure along lio m PANDA-TMF with 2.o m spatial resolution.

© 2018 The Author(s)