| The exponential growth of Internet traffic will require high capacity networks capable of efficiently routing various types of data format packets. Optical sh ort pulse with high stability and low jitter is the base of high speed opt ical transmission, and using advanced modulation technology (such as DPSK/DQPDK) to i mprove network spectrum efficiency is a widely used appr oach.. All-optical 3R regeneration, as an important aspect, is an ef fective technology to ensure the transmission quality of the all-optical network (AON). In this thesis , optical short pulse com pression based on fiber-optical parametric amplification (FOPA) and all-optical regeneration of PSK are investigated:A novel pulse source based on FOP A and phase modulator was proposed for the first time, in which the pulse width becomes narrower without the increase of pump power. It can be concluded by the theoretical analysis and experiment that when the pump is phase modulated to introduce positive chirp(or negative chirp), the frequency chirp of the idler is doubled, th rough suitable dispersion compensation medium, shorter pulse may be obtained compared to no phase modulation.To the problem of high base and lar ge sidelobe in the above schem e, we proposed another one. The CW light is first frequency-doubled m odulated by a MZM in which the undesirable chirps are suf ficiently re strained, and then m odulated by a phase modulator.The experimental results of 10GHz operation is demonstrated, with 0.5W average pump power , 11.4ps pulse is obtained, and it is suitable for th e application and research of OTMD in future for its high extinction ratio and no base.The theory of DPSK modulat ion and dem odulation is anal yzed in detail. V ia the simulation using the software, the influen ce of the receiver param eters to DPSK demodulation is analyzed. A DPSK dem odulator based on fiber MZ I is investigated and designed, experimental results of DPSK modulation and demodulation based on it is also analyzed.DPSK all optical regeneration based on satura ted FOPA is theoretically analyzed and emulation r esearch, re sults indica te th at this structu re can realiz e am plitude regeneration and preserve th e phase information at the s ame ti me, so depress the system BER effectively and prolong the transmission distance.A novel schem e of DPSK all optical re generation based on phase-to-polarization technology and SOA is proposed. It is firs t theoretically anal yzed, and verified through emulation for 40Gbit/s R Z-DPSK, it shows goo d regeneration results, and provide feasible reference for next experiment research.A novel schem e of DQPSK all optical re generation based on polarization delay interferometer (PDI) and MZM-SOA is proposed. Phase and intensity distribution before and after generation is presented th rough emulation, it is proved the feasibility of the scheme.
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