256 QAM (64 Gbit/s) Coherent Optical Transmission over 160 km with an Optical Bandwidth of 5.4 GHz

Nakazawa, Masataka; Okamoto, Seiji; Omiya, Tatsunori; Kasai, Keisuke

doi:10.1364/ofc.2010.omj5

Cited by 28 publications

(16 citation statements)

References 4 publications

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“…High-order optical QAM formats, such as 16, 64, and 256 QAM, have attracted significant attention because of their spectrally-efficient transmission characteristics in dense WDM as well as POLMUX environments [33,34,35]. The recent development of digital coherent optical receivers may enable the use of such sophisticated modulation formats in the near future.…”

Section: Transmission Characteristics Of Multi-level Modulated Signalsmentioning

confidence: 99%

Digital coherent optical communication systems: fundamentals and future prospects

Kikuchi¹

2011

IEICE Electron. Express

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Abstract:The recently-developed digital coherent receiver enables us to employ a variety of spectrally-efficient modulation formats such as M -ary phase-shift keying (PSK) and quadrature-amplitude modulation (QAM). Moreover, in the digital domain, we can equalize linear transmission impairments, which may stem from group-velocity dispersion (GVD) and polarization-mode dispersion (PMD) of fibers for transmission, because the phase information is preserved after coherent detection.This paper reviews the history of coherent optical communications, the principle of coherent detection, and the concept of the digital coherent receiver. After that, we discuss digital signal processing (DSP) for mitigating transmission impairments, coherent transmission characteristics of multi-level optical signals, and future prospects of coherent optical communications. Keywords: coherent optical communications, multi-level modulation, homodyne detection. Classification: Fiber-optic communication Lett., vol. 16, no. 5, pp. 179-181, Feb. 1980. [4] Y. Yamamoto, "Receiver performance evaluation of various digital optical modulation-demodulation systems in the 0.5-10 μm wavelength region," IEEE J. Quantum Electron., vol. QE-16, no. 11, pp. 1251-1259, Nov. 1980 Express, vol. 16, no. 2, pp. 804-817, Jan. 2008. [15] H. Sun, K.-T. Wu, and K. Roberts, "Real-time measurements of a 40-Gb/s coherent system," Opt. Express, vol. 16, no. 2, pp. 873-879, Jan. 2008. Lightwave Technol., vol. 29, no. 4, pp. 417-425, Feb. 2011. [18] References

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Section: Transmission Characteristics Of Multi-level Modulated Signalsmentioning

confidence: 99%

Digital coherent optical communication systems: fundamentals and future prospects

Kikuchi¹

2011

IEICE Electron. Express

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“…Increasing the transmission capacity requires increasing the spectral efficiency, and this has lead to considerable research activity in advanced modulation formats employing coherent detection [2]. In particular, polarization multiplexed quadrature phase shifted keying (PM-QPSK) has been widely acknowledged as an optimum modulation format and has been investigated under various transmission scenarios [3,4].…”

Section: Introductionmentioning

confidence: 99%

Compensation of intra-channel nonlinear fibre impairments using simplified digital back-propagation algorithm

Rafique¹,

Mussolin²,

Forzati³

et al. 2011

Opt. Express

132

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Abstract:We investigate a digital back-propagation simplification method to enable computationally-efficient digital nonlinearity compensation for a coherently-detected 112 Gb/s polarization multiplexed quadrature phase shifted keying transmission over a 1,600 km link (20x80km) with no inline compensation. Through numerical simulation, we report up to 80% reduction in required back-propagation steps to perform nonlinear compensation, in comparison to the standard back-propagation algorithm. This method takes into account the correlation between adjacent symbols at a given instant using a weighted-average approach, and optimization of the position of nonlinear compensator stage to enable practical digital backpropagation.

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“…The spectral efficiency has become one of the most critical tools for increasing the transmission capacity of optical networks, and has led to considerable research activity in advanced modulation formats employing coherent detection [3,4]. In particular, polarization multiplexed m-ary quadrature amplitude (PM-mQAM) modulation formats have received tremendous attention with reference to next-generation network upgrades [5,6], and at present, research is focused on developing wavelength-division-multiplexed (WDM) networks having per-channel data rates of 100 Gb/s and beyond [7][8][9]. The ability to deploy a dynamic and configurable optical layer is a direct consequence of such developments.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear and ROADM induced penalties in 28 Gbaud dynamic optical mesh networks employing electronic signal processing

Rafique¹,

Ellis²

2011

Opt. Express

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Abstract:We report the impact of cascaded reconfigurable optical add-drop multiplexer induced penalties on coherently-detected 28 Gbaud polarization multiplexed m-ary quadrature amplitude modulation (PM m-ary QAM) WDM channels. We investigate the interplay between different higher-order modulation channels and the effect of filter shapes and bandwidth of (de)multiplexers on the transmission performance, in a segment of panEuropean optical network with a maximum optical path of 4,560 km (80km x 57 spans). We verify that if the link capacities are assigned assuming that digital back propagation is available, 25% of the network connections fail using electronic dispersion compensation alone. However, majority of such links can indeed be restored by employing single-channel digital backpropagation employing less than 15 steps for the whole link, facilitating practical application of DBP. We report that higher-order channels are most sensitive to nonlinear fiber impairments and filtering effects, however these formats are less prone to ROADM induced penalties due to the reduced maximum number of hops. Furthermore, it has been demonstrated that a minimum filter Gaussian order of 3 and bandwidth of 35 GHz enable negligible excess penalty for any modulation order. 2054-2061 (2010). 10. A. Nag, M. Tornatore, and B. Mukherjee, "Optical network design with mixed line rates and multiple modulation formats," J. Lightwave Technol. 28(4), 466-475 (2010). 11. C. Meusburger, D. A. Schupke, and A. Lord, "Optimizing the migration of channels with higher bitrates," J. ©2011 Optical Society of America

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256 QAM (64 Gbit/s) Coherent Optical Transmission over 160 km with an Optical Bandwidth of 5.4 GHz

Cited by 28 publications

References 4 publications

Digital coherent optical communication systems: fundamentals and future prospects

Digital coherent optical communication systems: fundamentals and future prospects

Compensation of intra-channel nonlinear fibre impairments using simplified digital back-propagation algorithm

Nonlinear and ROADM induced penalties in 28 Gbaud dynamic optical mesh networks employing electronic signal processing

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