介绍了两类典型光学逆向调制器的工作原理，分析了它们面临的技术难题及各自的优缺点。综述了光学逆向调制技术的发展状况，讨论了它在无线光通信中的重要作用。探讨了国内发展光学逆向调制技术的技术瓶颈。

The principles of two typical optic retro-modulators are presented, and the advantages, disad-vantages and problems existing are analyzed. Developments of optic retro-modulation technique are reviewed and its important role in wireless optical communications is discussed. The choke points of developing optic retro-modulation technique are discussed.