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Investigation Of Timing Jitter On All-Optical Regeneration Based On Self-Phase Modulation

Posted on:2013-01-04Degree:MasterType:Thesis
Country:ChinaCandidate:Z ZhangFull Text:PDF
GTID:2248330395453550Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
All-optical regeneration is likely to be one of the key techniques in all-optical networks, as it can overcome electronic bottleneck and is completely transparent to the message format and transmission rate. The all-optical regeneration based on self-phase modulation effect is paid much more attention due to that it can improve the extinction ratio and reduce amplitude fluctuations. Furthermore it has advantages such as simple construct, low cost, easily coupled to fiber network and so on.In this thesis, the timing jitter induced by regenerator is analyzed. Firstly, aiming at the single-wavelength regeneration, the timing jitter caused by the regenerator based on self-phase modulation effect is analyzed and we use double-stage regenerator to reduce it. The performance of three different types of double-stage regenerator type A-A(two regenerators are both type A), type B-B(two regenerators are both type B) and type C-C(two regenerators are both type C), is investigated. We show that in the three double-stage regenerators, due to the change of pulse density after the regenerator, the performance of type C-C in timing jitter reduction is better than type B-B, and type A-A causes more serious timing jitter than the first regeneration. Besides, double stage regenerator can’t reduce timing jitter completely due to the limitation of itself.Secondly. the influence of intra-channel cross phase modulation and intra-channel four wave mixing effect on the performance of regeneration signals is investigated. We show that intra-channel nonlinear effects make the situation of timing jitter complexity, resulting in limited performance when using cascaded regenerators, it also decreases the performance of regenerator in amplitude noise suppression. The offset direction of filter has an impact on timing jitter but this kind of influence decreases by increasing the input signals.Finally, in the multi-wavelength regenerator based on dispersion management, the influence of regeneration signals induced by residual dispersion is discussed, and the limitation of transfer function is also discussed. As the residual dispersion has great impact on XPM effect and spectrum broadening, so it can change the quantity of signals. We show that the residual dispersion per section has greater impact on regenerator than the total residual dispersion. The regenerator has good performance when the value of residual dispersion per section is slightly grater than zero. Besides, by adjusting totally residual dispersion carefully, the regenerator can have stable performance. The curve of transfer function can’t reflect the performance of regenerator exactly as the change of signals. In order to describe its ability in amplitude equalization, one substitution is using peak to peak power instead of transfer function.
Keywords/Search Tags:all-optical regeneration, timing jitter, self-phase modulation, intra-channelnonlinear effects, residual dispersion, transfer function
PDF Full Text Request
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