Conventional ghost imaging is achieved by the position--position or momentum--momentum correlation between two beams. These correlations cannot be preserved when the beams propagate along single-mode optical fibers. Thus, conventional ghost imaging cannot be achieved distantly over single-mode fibers. Frequency correlations between signal photons and idler photons generated from the spontaneous nonlinear parametric process or between two light beams from the same thermal light source are noted. The frequency correlation can be stably preserved over optical fibers. Thus, we propose and demonstrate long-distance temporal ghost imaging schemes over optical fibers based on frequency correlations in correlated photon pairs and thermal light beams. This work extends the method for achieving ghost imaging, providing new ideas for applying ghost imaging over a large geographical scale. In this study, we review the principles and methods for quantum and thermal temporal ghost imaging over optical fibers. We introduce an application of temporal ghost imaging—quantum secure ghost imaging. Furthermore, a perspective on the development of temporal ghost imaging is provided.