righted I material TR 62343-6-8 @ IEC:2011(E) - 7 - licensed to BR Demo b before the optical receiver is controlled to keep the input power level to the optical receiver at an appropriate value. However a sudden change of input power causes signal errors. The optical performance in the transient state shall be in the predetermined region to avoid introducing such errors. The transient performance requirements for wavelength selective switches or optical amplifiers in DwDM systems are other examples of Level-3. The acceptable transient performance behaviours are precisely determined in other IEC standards. by Thomson Figure 4(b). In this case, the 3-dB down frequency is determined in order to avoid certain are physically the same and can be transformed into the other by employing Fourier transformation. Users or manufacturers can select the appropriate domain at their Reuters convenience. Performance + Shall be in State B this region State A to t1 Time IEC 2401/11 I on Nov-28-2014 by James Madison. I (a) Time domain view Performance 4 f: 3 dB down frequency No further 3dB Shall be in reproduction this region Frequency fc_min fc_max IEC2402/11 (b) Frequency domain view Figure4-Aschematic illustrationofLevel-3complexity . Uncontrolled when prin - 8 - TR 62343-6-8 @IEC:2011(E) Examplesofcategorization 4 Typical dynamic of complexity as shown in Table 1. Here, each column under transition time indicates the required time range. It is anticipated that this table will need to be updated with the developmentofnewtechnologies. Table1-Examplesofcategorization Transition time Levels >1s ~100ms ~10ms <1 ms 1 DGE, DGTE, OCM,TDC OCM, 1xN SW OCM, TF (wavelength (pre-equalization (monitor switching monitor use) use),VOA (asn 2 MxN Matrix Sw,wSS MxNMatrix Sw,wSS MxN Matrix SW,WSS (port-switching) (port-switching) (port-switching) 3 WB, WSS (changing TDC (adaptive 1xN SW (system VOA (EDFA use) attenuation) equalization use), redundancy use),TDC WB, WSS (changing (adaptive_equalization attenuation) use),VOA (MUX use) DGE: dynamic gain equalizer DGTE: dynamic gain tilt equalizer EDFA: erbium-doped fibre amplifier M: number of switch input ports MUX: multiplexer N: number of switch output ports OCM: optical channel monitor TDC: tuneable dispersion compensator TF: tuneable filter Sw: switch WB: wavelength blocker WSS: wavelength-selective switch 5 Conclusion There is a variety of dynamic modules with differing transient requirements. When the transient characteristics during the transition period are considered, it is very important to The subsequent discussions will be efficient and effective. If early consideration of the complexity level is not addressed, it will be difficult to come to an agreement between supplier and user. Copyrighted material licensed to BR Demo by Thomson Reuters ( TR 62343-6-8 @IEC:2011(E) - 6 - Bibliography IEC61300-3-21:1998,Fibreoptic interconnectingdevicesandpassivecomponents-E Basic test and measurement procedures-Part 3-21:Examinations and measurements -Switching timeandbouncetime IEC 62343-5-1:2009,Dynamicmodules-Testmethods-Part5-1:Dynamicgain tilt equalizer -Responsetimemeasurement Uncontrolled when print