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We experimentally demonstrated an optical communication system based on synchronized chaos between the transmitter and receiver with a sinusoidal signal of 1 GHz. In addition, we also experimented with the modulation of the system by a random bit stream at 140 Mb/s. Both experiments showed that the messages could be recovered at the receiver with a reasonable signal-to-noise ratio. These messages are directly embedded into the chaos through an electrooptic modulator in the transmitter. At the receiver the message is successfully recovered by both the subtracting method and the dividing method.