Christian Scheerer

Reduced model to describe SPM-limited fiber transmission in dispersion-managed lightwave systems

A reduced model to describe self-phase modulation (SPM)-limited fiber transmission in dispersion-managed lightwave systems is presented. By introducing a new figure of merit, the maximum transmission distance versus optical power can be determined without any numerical simulation. Together with simplified models for other nonlinear fiber effects, a useful set of design rules for a first-order performance estimation of wavelength-division multiplexed (WDM) systems is established.

Influence of the dispersion map on limitations due to cross-phase modulation in WDM multispan transmission systems

We determine system limitations due to cross-phase modulation (XPM) for non-zero dispersion shifted fiber by experiments and simulations. For the worst case of full dispersion compensation in each span we find a maximum power law whereas for appropriate undercompensation XPM can be efficiently suppressed.

SRS crosstalk in preemphasized WDM systems

With a new simple model for stimulated Raman scattering crosstalk and an 30 dBm system experiment we found that the shortest and longest wavelength channels are affected most by SRS crosstalk independent of the preemphasis.

System impact of ripples in grating group delay

We present simple analytical expressions which relate fiber grating group-delay ripples to system performance and allow the estimation of expected penalties. Experiments show excellent agreement with our theory. A WDM transmission experiment shows that the system performance can be drastically improved if the channels are slightly detuned in wavelength.

Limitations of dispersion-managed DWDM systems due to cross-phase modulation

We show that a similar relationship also applies to XPM. We determine the maximum XPM-limited transmission distance on standard single mode fibre (SSMF) and non-zero dispersion shifted fibre (NZDSF). Fully compensated fibre spans with an optimum post-compensation at the receiver (RX) site are assumed as a typical dispersion map in todays terrestrial DWDM systems. The dependence of our results on the channel spacing, the channel count and the residual dispersion is discussed.