We present a novel Manipulated Rotating Binary-Phase-Shift Keying(MR-BPSK)technique in this paper.On the basis of a pre-defined binary sequence,we randomly rotate the BPSK signals by 0°or 90°and the resulted fake QPSK signals can be recovered by using the traditional Constant Modulus Algorithm(CMA).Using the proposed method,we successfully implement 440 km 2Gbit/s repeaterless transmission.