Design Of The Long-Distance Optical Transceiver In The Undersea

Light source and the signal processing device are placed on the shore in the optical fiber hydrophone system using phase-generated-carrier technique, which make the wet end with no electronic devices. With the increasing requirements for detecting distance, photoelectric module, including light source and modulation, can be put under water to reduce the loss of light power in the optical fiber transmission and transmit the detected signal to the signal processing workstation on the shore.Optical transceivers must be applied to realize the low-rate optical communication between the workstation on the shore and the long-distance photoelectric modules under water. With these optical transceivers, the workstation on the shore can receive the synchronization signal for synchronization demodulation of PGC and controls the long-distance photoelectric modules under water. In this thesis, a long-distance optical transceiver is designed to meet the above requirements.Beginning with the principle of optical communication, characteristics of the basic optical active device are summarized firstly. And the working principle and circuit makeup of the optical transceiver are analyzed in detail.Secondly, according to the actual requirements, optical transmitter and optical receiver were designed into a small module to carry out low-rate optical transceiver. Finally, fundamental parameters of the optical transceiver are tested under existing conditions. The tests indicate that digital signals can be transmitted 70 kilometers by the optical transceiver in the single-mode optical fiber without any relay, which meet the aim of the study.