Font Size: a A A

Based On The Optical Fiber Of Four-wave Mixing Signal In Orthopedic Research

Posted on:2013-12-08Degree:MasterType:Thesis
Country:ChinaCandidate:F F TianFull Text:PDF
GTID:2248330374485386Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
All-optical3R regeneration(reshaping, re-amplifying and retiming) is consideredas a key point of the optical net in the future. And as the basic property of the3R, thereshaping can improve the extinction ratio(ER) and suppress the noises effectively. So itis important for us to do research on it. We study the schemes for all-optical signalamplitude reshaping using FWM in fibers from theory, simulations and experiments.The main contents are as follows:1. We get the solutions of coupled-waves equations of degenerate four-wavemixing (DFWM) numerically, and the results show that the power increase of pumpwave can decrease the period of energy interchange of pump and idler waves. And thepower transfer relationship of pump and idler in specific distances can be used forall-optical signal amplitude reshaping. We explain the all-optical signal amplitudereshaping principles from this point of view. An all-optical signal reshaping system isdesigned by utilizing the principles. Then we do simulations and experiments forverification.2. We analyze the major crosstalk occurring in the FWM-based multi-wavelengthall-optical regenerators. A new two-channel all-optical reshaping scheme based ondegenerate FWM is proposed, in which the linear polarization states of two high-powerdata light are orthogonal to each other. And they are controlled at45°relative to thecontinuous wave. It is shown by simulation that the non-degenerate FWM crosstalkcan be greatly suppressed by optimizing the HNLF birefringence. And both of theextinction ratio and Q-factor of regenerated signal are improved to a great extent.3. We give a scheme for8-channels all-optical signals amplitude reshaping usingFWM in fibers, which combines polarization multiplexing, time multiplexing anddouble directions. The simulation results show that the time delay of different signalsshould be2~3times as wide as the signal pulse. And the final results can make Q-factorand ER get a17.5and13.2dB improvement respectively.
Keywords/Search Tags:Multi-wavelength signal regeneration, all optical regeneration, Four wavemixing, polarization multiplexing, time multiplexing
PDF Full Text Request
Related items