Multi-mode digital optical fiber repeater as well as near-end machine, far-end machine and coverage system thereof

A multi-mode digital optical fiber repeater is used for the optimization of a GSM network and TD-SCDMA network. The multi-mode digital optical fiber repeater comprises a near-end machine and a far-end machine that are connected by optical fiber, wherein the near-end machine comprises a first duplexer, a first optical interface module, a second optical interface module, a first signal processing module and a first control management module; and the far-end machine comprises a third optical interface module, a GSM-mode second duplexer, a TD-SCDMA mode third filter, a second signal processing module and a second control management module. The repeater realizes the integrated coverage of the GSM network and the TD-SCDMA network, so as to reduce the cost, save the resources, facilitate the networking and be convenient for realizing the remote coverage within the wide range.