A Linearized Photonic Sampling Structure by Using Polarization-Dependent Modulators in Sagnac Loop

In this paper, a new photonic sampling structure with effective nonlinearity suppression and good signal-to-noise ratio (SNR) performance is proposed. The key feature of this scheme is the polarization-dependent modulators (P-DMZMs) and the sagnac loop structure. Attributing to the polarization sensitive characteristic of P-DMZMs, differences between transfer functions of the fundamental signals and distortions become visible. Meanwhile, the selection of specific biases in P-DMZMs provides the possibility of a preferable linearized performance for real-time photonic sampling. Simulation results indicate that the proposed scheme is capable for effective nonlinearity suppression and provides good SNR performance even in a large frequency range.