Abstract: This invention discloses an optical module with multiplexer for a remote of an IMT-2000 digital optical repeater. The functions of an optical transmitting part of the digital optical repeater according to the present invention is data donation through a forward link, data add/drop in each sector, data summing in respective sectors and data transmission through a reverse link. This invention discloses an optical module with multiplexer that is capable of implementing the optical transmitting part's function effectively by using a signal framing, scrambling, add/drop and PLL circuits with high Q value.