Polarization mode dispersion compensation at 10, 20, and 40 Gb/s with various optical equalizers

We propose the configuration of signal multiplexing with four polarization states and investigate its transmission performance over single-mode fiber links. Using coherent detection and digital signal processing, a demodulation scheme for four-polarization-multiplexed (4PM) system is presented. We discuss the impact of crosstalk from polarization mode dispersion and polarization beam splitter misalignment on the proposed 4PM system. Furthermore, the transmission distance could be doubled to *50 km by employing feedback decision equalizers.

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“…6b). Furthermore, if the improved dispersion compensation algorithm is employed [18,19], the multiplexed signal can be transmitted further. …”

Section: Setup and Simulation Resultsmentioning

confidence: 99%

Transmission and demodulation of multi-polarization-multiplexed signals

et al. 2014

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“…Dynamic control of the state of polarization of the light is critical to ensure the reliability the proposed optical communication scheme. Each dynamic polarization controller is bulky and expensive (Noe et al, 1999), severely limits the practicality of our scheme. Phase locking is another challenging obstacle as well.…”

Section: Bit Generation and Measurementmentioning

confidence: 99%

Optical Communication with Weak Coherent Light Fields

Lee¹,

Sua²,

Ahmad³

2013

Theory and Practice of Cryptography and Network Security Protocols and Technologies

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“…These approaches were designed to compensate for the effects of first-order PMD [1], [2] as well as high-order PMD [3]- [7], [12]. Typically, high-order PMD compensators (PMDCs) are multistage devices that have many degrees of freedom.…”

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confidence: 99%

“…The optimization problem as we have defined it can be stated more concisely in the form (3) This is a nonconstrained nonlinear optimization problem for which efficient solution algorithms are available. The optimization variables were chosen to be and , rather then the Fourier coefficients and , for the following reasons: this choice guarantees the unitarity of the synthesized system, the optimization variables are real and the domain of valid solutions is unbounded.…”

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confidence: 99%

Design of broad-band PMD compensation filters

Eyal

Yariv

2002

IEEE Photon. Technol. Lett.

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Abstract-We describe a new design approach for broad-band PMD compensation filters. An efficient algorithm for minimization of the maximum differential group delay within a given frequency band is described.Index Terms-Fiber-optic communication systems, optical filter design, PMD compensation, polarization-mode dispersion. IN RECENT YEARS, several approaches for polarization-mode dispersion (PMD) compensation have been studied. These approaches were designed to compensate for the effects of first-order PMD [1], [2] as well as high-order PMD [3]- [7], [12]. Typically, high-order PMD compensators (PMDCs) are multistage devices that have many degrees of freedom. A robust control algorithm is essential for using these broad-band PMDCs in practical applications. One major concern in controlling broad-band PMDCs is the possibility that they will converge to a local compensation optimum, which can be far from the absolute optimum. To overcome this problem some authors studied "feed forward" methods in which the Jones matrix (JM) of the PMD medium is determined online and the following compensation filter is adjusted so that its JM becomes as close as possible to the inverse JM of the PMD medium [8], [9]. The JM of the composite system, PMD medium and PMDC, becomes approximately frequency independent and PMD is compensated. Recently, a synthesis algorithm for such an inverse filter, in the absence of polarization-dependent loss or gain (PDL/G) was proposed [5]. The algorithm required knowledge of the medium JM and was based on expanding the elements of the desired JM as Fourier series and using the coefficients of the expansion to iteratively solve for the parameters of cascaded interferometric filters. The number of the terms in the Fourier expansion determined the number of basic cells in the filter. In general, however, the use of a finite number of terms in the Fourier expansion (typically smaller than 20) may result in large local deviations of the approximated matrix from the desired matrix. These deviations may cause the synthesis algorithm to fail or to produce large spikes in the PMD of the compensated system. In this letter, we demonstrate this and propose a new approach for designing a broad-band PMD compensation filters. The approach is general and is guaranteed to produce a solution. Instead of trying to synthesize an inverse medium the approach is based on minimization of the maximum differential group delay (DGD) in the band of interest. The method can be used as a basis for control algorithms of broad-band PMDCs and is applicable in the presence of PDL with only minor modifications.Manuscript

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Polarization mode dispersion compensation at 10, 20, and 40 Gb/s with various optical equalizers

Cited by 201 publications

References 21 publications

Transmission and demodulation of multi-polarization-multiplexed signals

Transmission and demodulation of multi-polarization-multiplexed signals

Optical Communication with Weak Coherent Light Fields

Design of broad-band PMD compensation filters

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