| 摘要 |
PURPOSE: To eliminate a distortion component generated by the laser transmitter of an analog optical transmission system. CONSTITUTION: A first optical carrier is modulated by using an information signal and a second optical carrier is modulated by inverting the information signal. The modulated first and second carriers are multiplexed into a single optical signal and the optical signal is transmitted through an optical-fiber transmission line. A receiver divides the optical signal into the carriers and restores the information signal and the inverted information signal. Then the receiver provides the information signal of an electrical area which is reduced in distortion by coupling both restored signals with each other. Therefore, a double detector balanced photodiode pair can be used for providing an analog RF output by coupling the restored information signal and inverted information signal. This device is practically suitable for the transmission of AM-VSB television signals. |
