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The power transfer function of a nonlinear optical loop mirror (NOLM) is experimentally investigated for both continuous-wave and pulsed operation of the pump signal. The difference between transmission and reflection responses is discussed in view of using the interferometer for the amplitude regeneration of multilevel signals.
We propose a design method for all-optical multi-level regenerators by mimicking the normalized power transfer function (PTF) in the first-order approximation to the ideal step-like PTF, in which a key step is to appropriately select the amplitude and phase conditions of Mach–Zehnder-interferometer (MZI)-based regenerators. As an example, we describe the design process of the self-phase-modulation...
The nonlinear polarization dependence (NPD) of a fiber polarization diversity system (PDS) is studied by means of the nonlinear power transfer functions (PTFs) of two orthogonally polarized beam paths (PBPs). In principle, a polarization-independent PDS can be developed when the PTF curves are centrally symmetric to each other in a certain range of input power. As an example, a data-pump four-wave-mixing-based...
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