High spectral efficiency 1.6-b/s/Hz transmission (8 x 40 Gb/s with a 25-GHz grid) over 200-km SSMF using RZ-DQPSK and polarization multiplexing

Wree, C.; Hecker‐Denschlag, Nancy; Gottwald, E.; Krummrich, Peter M.; Leibrich, Jochen; Schmidt, E.-D.; Lankl, Berthold; Rosenkranz, Werner

doi:10.1109/lpt.2003.816119

Cited by 76 publications

(26 citation statements)

References 7 publications

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“…The noises N I and N Q are derived from the noise terms in Equations (5) and (6). Since the last terms of the equations, N s (t)N s (t − T ) cos(θ(t) ± π/4 − θ(t − T )), are relatively small compared to the dominant noises of terms 2 and 3 at relevant SNRs, it is ignored in our calculation.…”

Section: Theoretical Ser Resultsmentioning

confidence: 99%

“…The performance of such systems was theoretically analysed in, e.g., References [4,5] and references therein. Experimental realisations of DQPSK systems were discussed in References [6][7][8][9], and more recently in WDM configurations [2,10,11]. Effects of the optical transmitter and receiver on system performance and channel capacity have, however, never been studied theoretically.…”

Section: Introductionmentioning

confidence: 99%

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Intersymbol interference in DQPSK fibre‐optic systems

Zhao¹,

Agrell²,

Karlsson³

2009

Trans Emerging Tel Tech

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SUMMARYThe limited bandwidth of high-speed transmitter and receiver hardware gives rise to intersymbol interference (ISI) in digital communication systems. The influence of such ISI is investigated in a low-complexity fibreoptical setting, using differential quaternary phase-shift keying (DQPSK) modulation. The ISI is approximated by a memoryless, stochastic model, for use in applications where neither equalisation nor sequence detection can be afforded. The channel capacity of this model is calculated and shown to depend strongly on the transmitter calibration. More than 3 dB is gained, at a target bit error rate (BER) of 10 −6 , by allowing the transmitted phase levels to deviate from their nominal multiples of π/2 by up to 7%.

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Section: Theoretical Ser Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intersymbol interference in DQPSK fibre‐optic systems

Zhao¹,

Agrell²,

Karlsson³

2009

Trans Emerging Tel Tech

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“…DBPSK, by offering higher XPM tolerance, is better suited for polarization multiplexing than OOK [57]. Several high spectral efficiency transmissions have been demonstrated using polarization multiplexing and RZ-DQPSK modulation [83]. Polarization multiplexing can also be used to mitigate intra-channel nonlinear penalties, rather than doubling spectral efficiency [84].…”

Section: Optical Modulation Formatsmentioning

confidence: 99%

Optical technologies and techniques for high bit rate fiber transmission

Liu¹,

Gill²,

Chandrasekhar³

2006

Bell Labs Tech. J.

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reduces the operational expenditure (OpEx) of such networks. Thirdly, high spectral efficiency (SE) can be achieved in a WDM system that has a common channel grid through the use of high bit rate channels. Improving spectral utilization facilitates increased overall system capacity and lower overall cost.In this paper, we review the advances in selected optical technologies and techniques for high bit rate fiber transmission. We describe optical terminal technologies and techniques for high bit rate transmission, including optical modulation formats and their corresponding transmitter and receiver designs. A comparison among different modulation formats, having amplitude and/or phase modulation, will be given. Also discussed are optical and electronic equalization techniques at the optical terminals, and forward error correction (FEC). We next review advances in optical repeaters, including optical amplifiers and dispersion compensators. Broadband Raman amplification and nonlinearity management will also be discussed. We follow by examining link design issues such as the

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“…This is due to the halved symbol rate compared to DPSK or OOK systems with the same data rate. Combining DQPSK with polarization division multiplex (PolDM) [3,4] quadruples the capacity of 40 Gb/s system to 160 Gb/s. The advances in EDFA and Raman amplifier technology allow data transmission over several thousand kilometers without regeneration [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…This is possible until the launch powers get so large that the nonlinear phase noise [10] becomes significant. Focusing on the DQPSK format, EDFA spans of 100 km length were used at 10 Gbaud (Gsymbols/s) [4], but only 75 km in a 40 Gbaud system [8]. Raman-assisted spans of 94.5 km length were reported only in a 20 Gbaud system [7].…”

Section: Introductionmentioning

confidence: 99%