Error-rate floor in optical ASK heterodyne systems caused by nonzero (semiconductor) laser linewidth

Jacobson, G. F.; Garrett, I.

doi:10.1049/el:19850191

Cited by 36 publications

(12 citation statements)

References 2 publications

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“…(29) is satisfied in the system investigated; then the BER floor due to phase noise is [36] = Q( PFSKPreFD where PFSK PreFD ~ " 2T_ WT (30) (31) (30) and (31) indicate that the lowest error rate is achieved with the smallest possible value of τ, which should be expected since in this case the frequency discriminator accumulates the minimum amount of phase noise (see (5 A)). The choice of τ is constrained by (29).…”

Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 94%

“…[30] does not indicate explicitly what is the recommended value of Δν/R, but inspection of their curves suggests Δν, IF R < 0.1 to 0.15 (16) where Δν ]Ρ = 2Δν if both lasers have the same linewidth. It follows from (16) which is close to our recommendation of 0.09 (see (15)).…”

Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 99%

“…It follows from (16) which is close to our recommendation of 0.09 (see (15)). The remaining difference is primarily due to the fact that [30] does not attempt to optimize the receiver; larger values of B, F in conjunction with optimum thresholds would probably bring their recommendation even closer to (15). We also note that the same authors studied FSK receivers [27,28]; the values of Δν they recommend for FSK receivers are larger than in (16)(17), and are, in fact, practically identical to our recommendation (see (15)).…”

Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 99%

“…Investigation of other coherent receivers is relegated to [33][34][35]. Prior to this work, laser linewidth requirements for the above-mentioned systems were studied in [6,14,[27][28][29][30][31][32]. Sections 5.2,6.4 and 7.2 compare the results of this paper with the results of [6,14,[27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Laser Phase Noise on Optical Heterodyne Communication Systems

Kazovsky¹

1986

Journal of Optical Communications

111

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The impact of laser phase noise on optical heterodyne communications receivers is analyzed in terms of the system signal-to-noise ratios and error rates. An ASK receiver, three FSK receivers and a DPSK receiver are investigated. The maximum permissible laser linewidth Δν is evaluated for each of these receivers and compared with previously published theoretical and experimental results. It is shown that Δν depends on the system data rate R and on the modulation/demodulation technique chosen. For example, DPSK receivers require at least Δν ^ 0.7% of R while FSK receivers with postdetection frequency discrimination require at least Δν ^ 1.9% of R if the mark-space separation 2 f d is equal to R. At the same time, ASK receivers with envelope postdetection processing, and FSK receivers with large frequency deviation are much more tolerant to phase noise: they only require Av<9%ofR.

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Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 94%

Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 99%

Section: Comparison Of the Results Of This Section With The Existing mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Laser Phase Noise on Optical Heterodyne Communication Systems

Kazovsky¹

1986

Journal of Optical Communications

111

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“…The degradation was entirely dependent on the modulation format and the implementation of analogue receivers. For larger phase noise values (laser 3-dB linewidths in the order of the bit-rate), so-called weakly coherent systems were build (ASK, large frequency deviation FSK or PolSK systems) where the BER-floor position was specified in the 10 -9 BER range in terms of the sum of laser linewidths relative to the intermediate frequency band pass filter bandwidth in the Rx [1,3,4]. For smaller laser linewidths -in the order of 1 % of the bit-rate -narrow deviation FSK (continuous phase FSK, CPFSK) systems or differential PSK (DPSK) systems could be build width the BER-floor position in the 10 -9 range [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

Phase Noise Influence in Coherent Optical DnPSK Systems with DSP based Dispersion Compensation

Jacobsen

Popov

et al. 2014

Journal of Optical Communications

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Abstract:We present a comparative study of the influence of dispersion induced phase noise for n-level PSK systems. From the analysis, we conclude that the phase noise influence for classical homodyne/heterodyne PSK systems is entirely determined by the modulation complexity (expressed in terms of constellation diagram) and the analogue demodulation format. On the other hand, the use of digital signal processing (DSP) in homodyne/intradyne systems renders a fiber length dependence originating from the generation of equalization enhanced phase noise. For future high capacity systems, high constellations must be used in order to lower the symbol rate to practically manageable speeds, and this fact puts severe requirements to the signal and local oscillator (LO) linewidths. Our results for the bit-error-rate (BER) floor caused by the phase noise influence in the case of QPSK, 16PSK and 64PSK systems outline tolerance limitations for the LO performance: 5 MHz linewidth (at 3-dB level) for 100 Gb/s QPSK; 1 MHz for 400 Gb/s QPSK; 0.1 MHz for 400 Gb/s 16PSK and 1Tb/s 64PSK systems. This defines design constrains for the phase noise impact in distributed-feed-back (DFB) or distributed-Bragg-reflector (DBR) semiconductor lasers, that would allow moving the system capacity from 100 Gb/s system capacity to 400 Gb/s in 3 years (1 Tb/s in 5 years). It is imperative at the same time to increase the analogue to digital conversion (ADC) speed such that the single quadrature symbol rate goes from today's 25 GS/s to 100 Gs/s (using two samples per symbol).

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Advances in Lightwave Systems Research

1987

At&T Technical Journal

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Twenty years have passed since the first serious proposal was made to use a glass‐fiber waveguide as a telecommunications transmission medium. Since then, vigorous research and development efforts have led to widespread applications of optical‐fiber communication throughout the telecommunications industry. Today, lightwave systems research is exploring the vast potential bandwidth of low‐loss single‐mode fibers for long‐haul and local‐network applications. Laboratory systems with experimental single‐frequency lasers and low‐noise avalanche photodiodes have attained multi‐gigabit‐per‐second transmission in single‐mode fibers that are well over 100 km long. Coherent technology promises high receiver sensitivity and offers an efficient means for channel selection in a densely packed wavelength‐multiplexed system. The first coherent‐systems experiments have confirmed theoretical expectations but many challenges lie ahead. Other novel systems for local distribution and networking are also under study. This paper reviews recent research progress in these areas.

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Error-rate floor in optical ASK heterodyne systems caused by nonzero (semiconductor) laser linewidth

Cited by 36 publications

References 2 publications

Impact of Laser Phase Noise on Optical Heterodyne Communication Systems

Impact of Laser Phase Noise on Optical Heterodyne Communication Systems

Phase Noise Influence in Coherent Optical DnPSK Systems with DSP based Dispersion Compensation

Advances in Lightwave Systems Research

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