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Polarization mode dispersion

About: Polarization mode dispersion is a research topic. Over the lifetime, 5147 publications have been published within this topic receiving 80055 citations. The topic is also known as: PMD.


Papers
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Journal ArticleDOI
TL;DR: The Almouti-type polarization-time (PT) coding scheme suitable for use in multilevel (M>or=2) block-coded modulation schemes with coherent detection is presented and the PT-decoder is found it to be similar to the Alamouti combiner.
Abstract: We present the Almouti-type polarization-time (PT) coding scheme suitable for use in multilevel (M≥2) block-coded modulation schemes with coherent detection. The PT-decoder is found it to be similar to the Alamouti combiner. We also describe how to determine the symbols log-likelihood ratios in the presence of laser phase noise. We show that the proposed scheme is able to compensate even 800 ps of differential group delay, for the system operating at 10 Gb/s, with negligible penalty. The proposed scheme outperforms equal-gain combining polarization diversity OFDM scheme. However, the polarization diversity coded-OFDM and PT-coding based coded-OFDM schemes perform comparable. The proposed scheme has the potential of doubling the spectral efficiency compared to polarization diversity schemes.

34 citations

Journal ArticleDOI
TL;DR: It is shown in this paper that reduced-guard-interval (RGI) CO-OFDM systems experience subcarrier-dependent phase noise (PN) from the local oscillator laser, and a grouped maximum-likelihood (GML) phase estimation approach is proposed to mitigate the DEPN impairment.
Abstract: Unlike conventional CO-OFDM systems, we show in this paper that reduced-guard-interval (RGI) CO-OFDM systems experience subcarrier-dependent phase noise (PN) from the local oscillator laser. This phenomenon manifests in RGI-CO-COFM systems because the chromatic dispersion (CD) induced walk-off becomes comparable to the OFDM symbol length. We term this phenomenon the dispersion enhanced PN (DEPN). In this work an analytical study of the impact of DEPN on CO-OFDM transmission is conducted. We develop a system-level analytical model and calculate the variance of the dispersion-induced subcarrier-dependent phase rotation term (PRT) using two different distribution patterns of pilot subcarriers (PS). Moreover, we present a bit error rate (BER) estimator to quantify the system performance degradation due to PRT. Numerical simulations are then performed to verify the analytical model. Finally, we propose a grouped maximum-likelihood (GML) phase estimation approach to mitigate the DEPN impairment, and demonstrate a 0.7-1.7 dB SNR improvement at BER = 10−3 for typical 100 Gb/s RGI CO-OFDM systems.

34 citations

Proceedings ArticleDOI
17 Nov 2003
TL;DR: Through simulation, this work finds substantial savings in terms of equipment cost, optimizing the placement of wavelength converters and PMD compensators and reduces the number of wavelength conversions, enhancing the optical signal quality.
Abstract: We propose routing and wavelength assignment in WDM networks based on a genetic algorithm. Two transmission impairments are added to the usual set of routing constraints. They are polarization mode dispersion (PMD) and amplified spontaneous emission (ASE). Through simulation, we find substantial savings in terms of equipment cost, optimizing the placement of wavelength converters and PMD compensators. Also, the proposed technique limits the number of cascaded amplifiers and reduces the number of wavelength conversions, enhancing the optical signal quality.

34 citations

Proceedings ArticleDOI
30 Sep 2001
TL;DR: In this article, a feed forward controller adjusts the differential group delay (DGD) of the PMD compensator in a single step, avoiding the need for dithering, and achieved 80 Gbps transmission over 45 km installed fiber employing automatic PMD-compensation.
Abstract: We report 80 Gbit/s transmission over 45 km installed fiber employing automatic PMD-compensation. A feedforward controller adjusts the DGD (differential group delay) of the PMD (polarization mode dispersion) compensator in a single step, avoiding the need for dithering.

34 citations

Journal ArticleDOI
TL;DR: The theory of Raman amplification in long multimode optical fibers, where strong random mode coupling within groups of quasi-degenerate modes is unavoidable is presented.
Abstract: We present the theory of Raman amplification in long multimode optical fibers, where strong random mode coupling within groups of quasi-degenerate modes is unavoidable. In such fibers, the signal components in modes that belong to the same strongly coupled group experience the same Raman amplification, where the differential gain is linearly dependent on the aggregate powers of the pump in each of the mode groups. The equations that we derive significantly facilitate the numerical and analytical study of Raman amplification in long multimode fibers.

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202332
202275
202145
202069
201968
201868