Influence of Pre- and Post-compensation of Chromatic Dispersion on Equalization Enhanced Phase Noise in Coherent Multilevel Systems

Jacobsen, Gunnar; Lidn, Marisol; Xu, Tianhua; Popov, Sergei; Friberg, Ari T.; Zhang, Yimo

doi:10.1515/joc.2011.053

Cited by 27 publications

(32 citation statements)

References 17 publications

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“…We have good agreement with the theoretically predicted error-rate-floor for case 3). The increasing EEPN influence for the FDE filter is as expected for case 2) and 3) [13,21,22,25]. For case 1) where EEPN from the Tx laser determines the phase noise performance we have a similar situation as when the CD equalization is performed in the transmitter with a FDE filter in the electrical domain [25].…”

Section: Simulation Results and Discussionsupporting

confidence: 53%

“…This interplay leads to a combination of correlated equalization enhanced phase noise (EEPN), amplitude noise and time jitter [13][14][15][16][17][18][19][20][21]. The detailed effect is dependent on which type of discrete chromatic dispersion compensation is implemented in the receiver (Rx) using post-CD compensation or in the transmitter (Tx) using pre-CD compensation [21,22]. Adaptive dispersion compensation -using the least mean square (LMS) method -has a different impact than using fixed filter implementations such as a time domain FD-FIR or FDE [21].…”

Section: Introductionmentioning

confidence: 99%

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EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation

Jacobsen

Popov

et al. 2012

Opt. Express

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A radio frequency (RF) carrier can be used to mitigate the phase noise impact in n-level PSK and QAM systems. The systems performance is influenced by the use of an RF pilot carrier to accomplish phase noise compensation through complex multiplication in combination with discrete filters to compensate for the chromatic dispersion (CD). We perform a detailed study comparing two filters for the CD compensation namely the fixed frequency domain equalizer (FDE) filter and the adaptive least-mean-square (LMS) filter. The study provides important novel physical insight into the equalization enhanced phase noise (EEPN) influence on the system bit-error-rate (BER) versus optical signal-to-noise-ratio (OSNR) performance. Important results of the analysis are that the FDE filter position relative to the RF carrier phase noise compensation module provides a possibility for choosing whether the EEPN from the Tx or the LO laser influences the system quality. The LMS filter works very inefficiently when placed prior to the RF phase noise compensation stage of the Rx whereas it works much more efficiently and gives almost the same performance as the FDE filter when placed after the RF phase noise compensation stage.

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Section: Simulation Results and Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation

Jacobsen

Popov

et al. 2012

Opt. Express

Self Cite

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“…[ [26][27][28][33][34][35][36]. Among these methods, the digital coherence enhancement shows the best performance [26,36], while it requires a complicated hardware implementation to measure the LO laser phase fluctuation.…”

Section: Discussionmentioning

confidence: 99%

Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise

Jacobsen

Popov

et al. 2015

Optics Communications

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Long-haul high speed optical transmission systems are significantly distorted by the interplay between the electronic chromatic dispersion (CD) equalization and the local oscillator (LO) laser phase noise, which leads to an effect of equalization enhanced phase noise (EEPN). The EEPN degrades the performance of optical communication systems severely with the increment of fiber dispersion, LO laser linewidth, symbol rate, and modulation format. In this paper, we present an analytical model for evaluating the performance of bit-error-rate (BER) versus signal-to-noise ratio (SNR) in the n-level

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“…All these studies considered only lasers with ideal Lorentzian line shape, i.e. with white FN spectrum 10–16 . We recently revisited the phenomenon for the white FN case.…”

Section: Introductionmentioning

confidence: 99%

Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments

Kakkar

Navarro

Schatz

et al. 2017

Sci Rep

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Coherent communication networks are based on the ability to use multiple dimensions of the lightwave together with electrical domain compensation of transmission impairments. Electrical-domain dispersion compensation (EDC) provides many advantages such as network flexibility and enhanced fiber nonlinearity tolerance, but makes the system more susceptible to laser frequency noise (FN), e.g. to the local oscillator FN in systems with post-reception EDC. Although this problem has been extensively studied, statistically, for links assuming lasers with white-FN, many questions remain unanswered. Particularly, the influence of a realistic non-white FN-spectrum due to e.g., the presence of 1/f-flicker and carrier induced noise remains elusive and a statistical analysis becomes insufficient. Here we provide an experimentally validated theory for coherent optical links with lasers having general non-white FN-spectrum and EDC. The fundamental reason of the increased susceptibility is shown to be FN-induced symbol displacement that causes timing jitter and/or inter/intra symbol interference. We establish that different regimes of the laser FN-spectrum cause a different set of impairments. The influence of the impairments due to some regimes can be reduced by optimizing the corresponding mitigation algorithms, while other regimes cause irretrievable impairments. Theoretical boundaries of these regimes and corresponding criteria applicable to system/laser design are provided.

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Influence of Pre- and Post-compensation of Chromatic Dispersion on Equalization Enhanced Phase Noise in Coherent Multilevel Systems

Cited by 27 publications

References 17 publications

EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation

EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation

Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise

Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments

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