Signal statistics in fiber-optical channels with polarization multiplexing and self-phase modulation (original) (raw)
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Modeling of the polarization mode dispersion in the single mode optical fiber links
Modeling Aspects in Optical Metrology II, 2009
With the extension of the spectral exploitation of optical fibers beyond the Cband, accurate modeling and simulation of nonlinear interference (NLI) generation is of the utmost performance. Models and numerical simulation tools rely on the widely used Manakov equation (ME): however, this approach when also considering the effect of polarization mode dispersion (PMD) is formally valid only over a narrow optical bandwidth. In order to analyze the range of validity of the ME and its applicability to future wide-band systems, we present numerical simulations, showing the interplay between NLI generation and PMD over long dispersion-uncompensated optical links, using coherent polarization division multiplexing (PDM) quadrature amplitude modulation (QAM) formats. Using a Monte-Carlo analysis of different PMD realizations based on the coupled nonlinear Schrödinger equations, we show that PMD has a negligible effect on NLI generation, independently from the total system bandwidth. Based on this, we give strong numerical evidence that the ME can be safely used to estimate NLI generation well beyond its bandwidth of validity that is limited to the PMD coherence bandwidth.
Compensation for Polarization Mode Dispersion in Multi-Channel System.
satnac.org.za
Intensity induced random varying birefringence leads to nonlinear polarization mode dispersion (PMD) in addition to linear PMD. In this article we investigate the effect of nonlinear PMD on a sideband channels with respect to centre wavelength. It is shown that if three or more channels are launched in the fibre such that the two sideband signals are aligned along the fast and the slow axis respectively, the nonlinear PMD due to change in power of the centre wavelength will affect the two signals differently. The effect will depend on how the State of polarization (SOP) of the centre wavelength are oriented with respect to the fibre axis. Generally we noticed that the sideband signals are little affect with nonlinear PMD if the centre wavelength power is coupled equally into the fibre axes. It was also shown that the nonlinear and linear PMD can be compensated for the effective PMD for each channel by tracking the SOPs of the sideband signals and applying the feedforward technique. The worst channel signal Degree of polarization (DOP) improved by more than 100%.
A Statistical Treatment of Cross-Polarization Modulation in DWDM Systems
Journal of Lightwave Technology, 2000
Starting from a model of random nonlinear polarization rotations for the effect of cross-polarization modulation in DWDM systems, we derive the mean distribution of the time-dependent polarization states at an arbitrary location within an optical link. We show that this distribution is fully parameterized by the degree of polarization of the particular wavelength channel, and we derive expressions to approximate this parameter for general optical links consisting of multiple optically amplified and dispersion-compensated spans, as well as related power thresholds. From the analytical expressions we derive a method to significantly reduce the detrimental effects.
Journal of Lightwave Technology, 2000
Polarization division multiplexing (PDM) has been proposed as a scheme for increasing data rates in fiber optic communication systems. In the PDM scheme, the use of two orthogonal polarizations as alternative data paths is a promising approach in terms of doubling the information rate relative to conventional schemes. However, due to the severe distortion caused by the propagation medium, especially the Polarization mode dispersion (PMD), the development of receiver compensation methods are critical for the deployment of PDM based transceivers. This article proposes a receiver compensation method for high symbol rate fiber optic communication links, where the two data streams sent through orthogonal polarizations are mixed by the fiber channel not only in space but also in time. The proposed receiver algorithm adaptively recovers the original pair of data streams from their space-time mixtures. We also provide simulation results for an end-to-end fiber communication link to illustrate the performance of the proposed approach.
Photonics
Transmission demand continues to grow and higher capacity optical communication systems are required to economically meet this ever-increasing need for communication services. This article expands and deepens the study of a novel optical communication system for high-capacity Local Area Networks (LANs), based on twisted optical fibers. The complete statistical behavior of this system is shown, designed for more efficient use of the fiber single-channel capacity by adopting an unconventional multilevel polarization modulation (called "bands of polarization"). Starting from simulative results, a possible reference mathematical model is proposed. Finally, the system performance is analyzed in the presence of shot-noise (coherent detection) or thermal noise (direct detection).
A REVIEW ARTICLE OF POLARIZATION BASED PDM-QPSK MODULATION FORMATS IN FIBER COMMUNICATION
The ongoing growing demand for bigger capability in optical communication systems, whereas maintaining signal quality. during this report, increasing the fiber spectral potency and enhancing bit rate of trans-receiver by mistreatment circular polarization at the side of linear polarization and DQPSK modulation techniques has been planned. planned formula is employed during this system for multiplexing linearly polarized and circularly polarized signals. additionally to polarization DQPSK for enhancing bit rate while not moving the spectral dimension of trans-receiver. at the start linear polarization is employed for enhancing the bit rate. currently at the side of circular polarization the bit rate and potency becomes double.
Journal of Lightwave Technology, 2009
Polarization division multiplexing (PDM) has been proposed as a scheme for increasing data rates in fiber optic communication systems. In the PDM scheme, the use of two orthogonal polarizations as alternative data paths is a promising approach in terms of doubling the information rate relative to conventional schemes. However, due to the severe distortion caused by the propagation medium, especially the Polarization mode dispersion (PMD), the development of receiver compensation methods are critical for the deployment of PDM based transceivers. This article proposes a receiver compensation method for high symbol rate fiber optic communication links, where the two data streams sent through orthogonal polarizations are mixed by the fiber channel not only in space but also in time. The proposed receiver algorithm adaptively recovers the original pair of data streams from their space-time mixtures. We also provide simulation results for an end-to-end fiber communication link to illustrate the performance of the proposed approach.