Coherent RZ-8PSK transmission at 30 Gbit/s over 1200 km employing homodyne detection with digital carrier phase estimation

Seimetz, Matthias; Molle, L.; Gross, Dirk-Daniel; Auth, B.; Freund, Ronald

doi:10.1049/ic:20070298

Cited by 15 publications

(3 citation statements)

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“…In this case, a direct detection system which also uses a form of OFDM to increase the ISD may be used [27], where a dispersion map optimised for 40 Gb/s transmission was used to minimise the impact of non-linearity [49,73]. With coherent detection, fibre non-linearity was successfully managed over an in-line compensated map by using a RZ-shaped constant intensity modulation format, and the ISD was increased further using 8-PSK [74]. Over even shorter distances, the improved OSNR enables the use of yet higher-order modulation formats.…”

Section: Non-linear Limitsmentioning

confidence: 99%

Approaching the Non-Linear Shannon Limit

Ellis

Zhao

Cotter

2010

J. Lightwave Technol.

468

248

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Abstract-We review the recent progress of information theory in optical communications, and describe the current experimental results and associated advances in various individual technologies which increase the information capacity. We confirm the widely held belief that the reported capacities are approaching the fundamental limits imposed by signal-to-noise ratio and the distributed non-linearity of conventional optical fibres, resulting in the reduction in the growth rate of communication capacity. We also discuss the techniques which are promising to increase and/or approach the information capacity limit.

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Section: Non-linear Limitsmentioning

confidence: 99%

Approaching the Non-Linear Shannon Limit

Ellis

Zhao

Cotter

2010

J. Lightwave Technol.

468

248

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“…In recent years, a lot of progress has been obtained in this field. As a first step beyond quaternary phase shift keying (QPSK), 8PSK long-haul transmission of a single-channel has been demonstrated in 2007 1 . Meanwhile, many of the modulation formats known from electrical and wireless transmission have been also transmitted over optical fiber, employing wavelength division multiplexing (WDM) and polarization division multiplexing (PDM).…”

Section: Introductionmentioning

confidence: 99%

8×224 Gbit/s PDM 16QAM WDM transmission with real-time signal processing at the transmitter

Nölle

Hilt

Molle

et al. 2010

36th European Conference and Exhibition on Optical Communication

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“…Transmission over long distances using higher-order modulation and coherent detection was already demonstrated for quadrature phase shift keying (QPSK) [1] and 8-ary phase shift keying (8PSK) [2,4]. In this paper, long-haul WDM transmission of 16-ary quadrature amplitude modulation in star constellation, Star-16QAM, is investigated for transmission spans without inline dispersion compensation.…”

Section: Introductionmentioning

confidence: 99%

80 Gbit/s/λ̣ polarization multiplexed star-16QAM WDM transmission over 720 km SSMF with electronic distortion equalization

Freund

Louchet

Gruner

et al. 2009

2009 14th OptoElectronics and Communications Conference

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For the first time, 80/40 Gbit/s/O Star-16QAM WDM transmission with/without polarization multiplexing has been demonstrated over 720/1200 km SSMF on a 50 GHz frequency grid applying enhanced techniques for electronic distortion equalization. IntroductionHigher-order optical modulation formats in combination with coherent detection and electronic distortion equalization (EDE) are key emerging technologies paving the way to 100 Gb-Ethernet and highest spectral efficiency as they lead to a reduction of symbol rate and spectral width per WDM channel. Transmission over long distances using higher-order modulation and coherent detection was already demonstrated for quadrature phase shift keying (QPSK) [1] and 8-ary phase shift keying (8PSK) [2,4]. In this paper, long-haul WDM transmission of 16-ary quadrature amplitude modulation in star constellation, Star-16QAM, is investigated for transmission spans without inline dispersion compensation. When applying Star-16QAM, the spectral efficiency can theoretically be increased 4-fold without, and 8-fold with polarization multiplexing (PM), respectively. Data rates of 80 Gbit/s per wavelength can be generated by using PM Star-16QAM requiring a symbol rate of only 10 Gbaud. Generation and transmission of the Square-16QAM format have been already demonstrated by using multilevel driving signals and a single stage IQmodulator [5] or by using an integrated solution of a quad-parallel Mach-Zehnder modulator (MZM) [6]. At this stage, main challenges of these solutions are the generation of the high quality driving signals for the IQmodulator as well as the performance of the integrated quad-parallel MZM. In this paper we demonstrate generation of Star-16QAM by using binary driving signals only based on state of the art modulators as well as WDM transmission over 720/1200 km SSMF on a 50 GHz frequency grid with/without polarization multiplexing. Using EDE after coherent detection, chromatic dispersion can effectively be compensated for in the frequency domain [3], while other transmission impairments (such as polarization cross-talk) are usually compensated in the time domain using blind channel equalization (BCE) techniques, such as the constant modulus algorithm (CMA). In this paper,

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Coherent RZ-8PSK transmission at 30 Gbit/s over 1200 km employing homodyne detection with digital carrier phase estimation

Cited by 15 publications

References 0 publications

Approaching the Non-Linear Shannon Limit

Approaching the Non-Linear Shannon Limit

8×224 Gbit/s PDM 16QAM WDM transmission with real-time signal processing at the transmitter

80 Gbit/s/λ̣ polarization multiplexed star-16QAM WDM transmission over 720 km SSMF with electronic distortion equalization

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