Nonlinear Transmission Behaviour of a Single-Mode Fiber Transmission Line due to Polarization Coupling

Abstract

The transmission behaviour of a single-mode fiber line is analyzed in detail. It is shown that nonlinear distortions occur due to the modulation of polarization within the fiber which also modulates the transmission characteristics. Since these distortions increase with increasing modulation frequency a significant reduction in the useful bandwidth occurs. In order to transmit a 200 MHz-signal with low distortions the bandwidth due to the intermodal dispersion between the polarizations should at least be in the order of about 5 GHz-ΙΟ GHz.modulation of the injection current also yields a modulation of the emission wavelength [10, 11] thus yielding also a modulation of polarization within the fiber. This modulation of polarization may also yield a modulation of the transmission behaviour of the fiber line, thus finally introducing nonlinear distortions with respect to the transmitted optical power. Transmission characteristics of a singlemode fiber line