Gaussian approach for performance evaluation of optically preamplified receivers with arbitrary optical and electrical filters

Rebola, Joao L.; Cartaxo, Adolfo V. T.

doi:10.1049/ip-opt:20010520

Cited by 63 publications

(30 citation statements)

References 13 publications

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“…In order to take accurately into account the impact of ISI on the DQPSK system performance, separate Gaussian distributions with different means and STDs are associated with each one of the transmitted bits. This approach has already proved to be accurate to estimate the ISI impact on OOK modulation (Rebola & Cartaxo, 2001). The BEP of each component of the DQPSK signal can be seen as the mean of four BEPs associated with the four nominal means for the PDF of the EDP.…”

Section: Bit Error Probability Computation By Semi-analytical Simulatmentioning

confidence: 99%

“…With this objective, the Gaussian approximation (GA) for the probability density function (PDF) of current at the decision circuit input was investigated. This approximation has been extensively used in OOK modulated system performance evaluation, leading to quite good accuracy (Rebola & Cartaxo, 2001). However, its use leads to high discrepancies in DQPSK system performance evaluation (Bosco & Poggiolini, 2006).…”

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confidence: 99%

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Optical DQPSK Modulation Performance Evaluation

Costa¹,

Cartaxo²

2010

Advances in Lasers and Electro Optics

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Section: Bit Error Probability Computation By Semi-analytical Simulatmentioning

confidence: 99%

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confidence: 99%

Optical DQPSK Modulation Performance Evaluation

Costa¹,

Cartaxo²

2010

Advances in Lasers and Electro Optics

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“…The Q-factor is estimated by means of a semi-analytic approach, where the signal waveform is obtained numerically and the noise influence is calculated analytically [13]. This method is appropriate for arbitrary electrical and optical filters.…”

Section: Simulation Setup and Figure Of Meritmentioning

confidence: 99%

“…This method is appropriate for arbitrary electrical and optical filters. The Q-factor penalty is calculated using (3) [13]:…”

Section: Simulation Setup and Figure Of Meritmentioning

confidence: 99%

40 Gb/s Optical Single Sideband DWDM Transmission System using Polar Return-to-Zero Signalling Format

Ferreira

Silveira

Monteiro

et al. 2007

2007 9th International Conference on Transparent Optical Networks

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Optical single sideband (oSSB) 40 Gb/s transmission systems using binary polar coded return-to-zero (RZ) pulse shape are proposed to enable dense wavelength division multiplexing networks employing efficient electrical dispersion compensation (EDC). The detuning of ITU 50, 100, and 200 GHz grids optical filters is optimized by simulation. In presence of optical fibre and EDC, polar RZ oSSB clearly surpasses common nonreturn-to-zero oSSB for all the considered grids. After 160 km of standard single mode fibre, polar RZ retrieves Q-factors above 6 for the 50 GHz grid and above 7 for the remaining grids; whereas NRZ Q-factor is never superior to 3 after only 80 km. Keywords: signalling format, electrical dispersion compensation (EDC), optical single sideband (oSSB), optical communication systems, dense wavelength division multiplexing (DWDM). INTRODUCTIONThe increasing offer of broadband applications is leading to higher transmission bandwidth requirements. This demand can be satisfied by dense wavelength division multiplexing (DWDM) core networks; these offer high capacity and long reach transmission. Advanced modulation formats are essential to the cost-efficiency of DWDM networks. Among these, differential binary phase shift keying (DPSK) [1], differential quadrature phase shift keying (DQPSK)[2], duobinary [3], carrier-suppressed return-to-zero (CS-RZ) [4], and optical single sideband (oSSB)[5] have presented promising characteristics.Optical SSB allows DWDM channel density increase and improved tolerance to group velocity dispersion (GVD) due to the suppression of one of the signal sidebands. Moreover, efficient electrical dispersion compensation (EDC) can be combined with direct detected (DD) oSSB signals to further mitigate the effects of GVD. Simple EDC methods have been proposed with results at 10 Gb/s and 40 Gb/s, such as simple dispersive lines, adaptive filters, or Butterworth filters [5]- [8]. EDC can be used as a stand alone technique or to minimize residual dispersion arising from mismatched optical dispersion compensation.The combination of optical SSB modulation, coding formats and the return-to-zero (RZ) pulse shape has been proposed to enhance the system performance due to enhanced tolerance to intersymbol interference (ISI) of RZ shape. Promising results have been recently presented in [9], where polar coding and RZ pulse shape are combined with carrier-unsuppressed oSSB signals at 10 Gb/s. The proposed transmitter enables improved receiver sensitivity and transmission distances when compared to a common non-return-to-zero (NRZ) oSSB system. In this work, polar RZ signalling is explored for the first time at 40 Gb/s. The potential of the generated oSSB signal for inclusion in the 200 GHz, 100 GHz and 50 GHz ITU grids is assessed in back-to-back situation and after fibre transmission and EDC. The results are compared with those obtained by common oSSB-NRZ.

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“…Each receiver is modeled by a positive-intrinsic-negative (PIN) photodiode with responsivity of 1 A/W, an electrical filter modeled by a fourth-order Bessel filter with a 3 dB bandwidth of 0.65·R b , and a decision circuit. The Gaussian approach presented in [5] is used to compute the bit error ratio. The Q-factor (Q) is used to categorize the system performance.…”

Section: System Modelingmentioning

confidence: 99%

Comparison of Performance of SSB-AMI-RZ Formats in Long-Haul 40 Gbit/s/channel UDWDM Transmission Systems

Dias

Cartaxo

2006

2006 International Conference on Transparent Optical Networks

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The transmission performance of single-sideband alternate mark inversion return-to-zero (SSB-AMI-RZ) formats, with duty-cycles of 15%, 30% and 50%, in long-haul 40 Gbit/s/channel ultra dense WDM systems with 50 GHz of channel spacing is assessed through systematic numerical simulation. After optimizing the bandwidths and detuning of optical multiplexer and demultiplexer, the dispersion maps are optimized for each duty-cycle. From these, the tolerances to the in-line residual dispersion (IRD) and total residual dispersion (TRD), and the nonlinear thresholds (NLT) are assessed. It is shown that the different SSB-AMI-RZ formats have high tolerance to linear crosstalk, due to a -20 dB bandwidth much smaller than the channel spacing, and similar tolerance to IRD. Numerical results indicate that the format with duty-cycle of 15% outperform the others because of its better tolerance to TRD and higher NLT. Keywords: alternate mark inversion (AMI), dispersion map, fiber nonlinearity, nonlinear threshold, residual dispersion, single-sideband (SSB), ultra-dense wavelength division multiplexing (UDWDM). INTRODUCTIONThe trend in the next generation of wavelength division multiplexing (WDM) transmission systems is to achieve very high spectral efficiency (increasingly close to 1 bit/s/Hz). Such systems are called ultra dense WDM (UDWDM). To achieve that goal, it is mandatory to carefully investigate the spectral efficiency of the used modulation format, optimize the optical multiplexer (MUX) and demultiplexer (DMUX) and electrical filters, and the dispersion map [1]. Single-sideband (SSB) filtering has been proposed to attain high spectral efficiency. In particular, SSB filtering of alternate mark inversion return-to-zero (AMI-RZ) format -which presents low spectral content around the carrier frequency -was proposed to generate a signal with features suitable for UDWDM systems [2]. In [2], it was shown that the SSB-AMI-RZ format with a full-width-at-half maximum (FWHM) of 33% of the bit time, i.e. a duty-cycle of 33%, has better long-haul UDWDM transmission performance than the bandwidth-limited duobinary format considered in [3]. In addition, the UDWDM transmission performance of the SSB-AMI-RZ format may still be improved by choosing adequately the pulse shape and the duty-cycle of the AMI-RZ signal.The purpose of this work is to compare, through extensive numerical simulation, the performance and resilience to dispersion map and fiber nonlinearity of the SSB-AMI-RZ formats with three different duty-cycles in long-haul UDWDM transmission systems. The analysis considers a link with 10 spans of standard singlemode fiber (SSMF), a transmission bit rate of R b = 40 Gbit/s per channel, and a channel spacing of 50 GHz.

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Gaussian approach for performance evaluation of optically preamplified receivers with arbitrary optical and electrical filters

Cited by 63 publications

References 13 publications

Optical DQPSK Modulation Performance Evaluation

Optical DQPSK Modulation Performance Evaluation

40 Gb/s Optical Single Sideband DWDM Transmission System using Polar Return-to-Zero Signalling Format

Comparison of Performance of SSB-AMI-RZ Formats in Long-Haul 40 Gbit/s/channel UDWDM Transmission Systems

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