Research On Clock Recovery Of160Gbaud OTDM Systems

As people continuously improve the level of information required, massive data requires high speed and long-haul transmission. So, researchers carried out in-depth research on core network transmission rate. There are two effective ways to enhance transmission rate in a single fiber:WDM(Wavelength Division Multiplexing) is based on multiple channels and OTDM(Optical Time Division Multiplexing) is based on a single channel with time domain multiplexing technique.In this thesis, based on the863national key project "160Gb/s single channel high speed optical transmission key techniques and experimental systems", we completed theoretical research and experimental realization of clock recovery and demultiplexing which are two key technologies in the receiver end.In the clock extraction technology research, we have adopted the traditional mature and stable optoelectronic oscillator (OEO) realizing160GBaud optical signals injection locking of a positive feedback loop to extract40GHz clock signal. The Single Side Band phase noise of extracted40GHz clock is very low,-101dBc/Hz, only3dB higher than the microwave source we used and the time jitter is only48fs.As for the demultiplexing module, we proposed a new scheme that used PolM as an equivalent intensity modulator to achieve4ps narrow pulse window cascaded with MZM. The4ps narrow switch gate with extinction ration of20dB is narrow enough to demultiplex the160GBaud OTDM signal and40GBaud tributary signal with clear eye diagram and no crosstalk is easily demultiplexed. The SSB phase noise and time jitter of extracted40GHz clock is-102dBc/Hz and36fs, respectively.