Optical transmission device based on direct-sequence-spread-spectrum time-division-multiple-access and method thereof

An optical transmission device based on direct-sequence-spread-spectrum time-division-multiple-access, comprising a signal transmitting module and a signal receiving module;

• wherein the signal transmitting module is connected with the signal receiving module by optical fibers;
• the signal transmitting module is used for receiving an external data sequence signal, encoding the external data sequence signal into a direct-sequence-spread-spectrum time-division-multiple-access electric signal, and modulating the direct-sequence-spread-spectrum time-division-multiple-access electric signal into a direct-sequence-spread-spectrum time-division-multiple-access optical signal;
• the signal receiving module is used for receiving the direct-sequence-spread-spectrum time-division-multiple-access optical signal and sequentially performing photoelectric conversion, analog despreading, analog-digital conversion, and clock recovery to obtain the external data sequence signal;
• the signal transmitting module comprises a signal modulation sub-module, and the signal modulation sub-module is a raised cosine encoding modulation sub-module or a modified duobinary encoding modulation sub-module, wherein the raised cosine encoding modulation sub-module is used for receiving the external data sequence signal and sequentially performing signal spectrum spreading and raised cosine encoding to obtain a raised cosine electric signal;
• the modified duobinary encoding modulation sub-module is used for receiving the external data sequence signal and sequentially performing signal spectrum spreading, positive and negative separation, and modified duobinary encoding to obtain a modified duobinary differential electric signal.