Mitigation of EEPN in Coherent Optical Systems With Low-Speed Digital Coherence Enhancement

Kakkar, Aditya; Navarro, Jaime Rodrigo; Schatz, Richard; Pang, Xiaodan; Ozoliņš, Oskars; Louchet, Hadrien; Jacobsen, Gunnar; Popov, Sergei

doi:10.1109/lpt.2015.2447839

Cited by 9 publications

(8 citation statements)

References 15 publications

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“…The next possible scheme is given by Scheme 3 (see Table 1), where the CPR of the LO is performed before the equalizer and the CPR of the Tx after the equalizer. In [25,26], it is realized by extracting phase noise information from the LO laser using low bandwidth digital coherence enhancement. Later, the compensation is performed before the equalizer in the post-processing block.…”

Section: Practicable Schemes Employing All-electronic Impairment Mitimentioning

confidence: 99%

“…The CPR for Tx in the pre-processing block requires information of the Tx phase noise a priori to data modulation. This can be realized by using low speed digital coherence enhancement proposed in [25,26]. The post-processing can have two variants depicted by Schemes 4 and 5.…”

Section: Practicable Schemes Employing All-electronic Impairment Mitimentioning

confidence: 99%

“…Meanwhile, the CPR for LO is performed in the post-processing block. This subset (see Schemes 7 and 8) can be practically realized using the digital coherence enhancement proposed in [25] and [26]. Schemes such as distributing the amount of EDC between the pre-and post-processing blocks are discarded as they do not provide any additional advantage as shown later.…”

Section: Practicable Schemes Employing All-electronic Impairment Mitimentioning

confidence: 99%

“…The results were experimentally validated in [24]. Based on the findings in [23][24][25], a realistic implementation of the mitigation technique was proposed in [26].…”

Section: Introductionmentioning

confidence: 99%

“…The results were experimentally validated in [24]. Based on the findings in [23][24][25], a realistic implementation of the mitigation technique was proposed in [26]. In our recent paper [27], we presented a rigorous nonlinear and time variant analysis (non-LTI) of the most common system configuration with post-reception electronic dispersion compensation (EDC) followed by carrier phase recovery (CPR).…”

Section: Introductionmentioning

confidence: 99%

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Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing

Kakkar

Navarro²,

Schatz

et al. 2016

Photonics

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We present an extensive study of equalization enhanced phase noise (EEPN) in coherent optical system for all practical electronic dispersion compensation configurations. It is shown that there are only eight practicable all-electronic impairment mitigation configurations. The non-linear and time variant analysis reveals that the existence and the cause of EEPN depend on the digital signal processing (DSP) schemes. There are three schemes that in principle do not cause EEPN. Analysis further reveals the statistical equivalence of the remaining five system configurations resulting in EEPN. In three of them, EEPN is due to phase noise of the transmitting laser, while in the remaining two, EEPN is caused by the local oscillator. We provide a simple look-up table for the system designer to make an informative decision regarding practicable configuration choice and design.

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Section: Practicable Schemes Employing All-electronic Impairment Mitimentioning

confidence: 99%

Section: Practicable Schemes Employing All-electronic Impairment Mitimentioning

confidence: 99%

Section: Practicable Schemes Employing All-electronic Impairment Mitimentioning

confidence: 99%

“…The results were experimentally validated in [24]. Based on the findings in [23][24][25], a realistic implementation of the mitigation technique was proposed in [26].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing

Kakkar

Navarro²,

Schatz

et al. 2016

Photonics

Self Cite

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Digital nonlinearity compensation in high-capacity optical communication systems considering signal spectral broadening effect

Karanov

Shevchenko

et al. 2017

Sci Rep

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Nyquist-spaced transmission and digital signal processing have proved effective in maximising the spectral efficiency and reach of optical communication systems. In these systems, Kerr nonlinearity determines the performance limits, and leads to spectral broadening of the signals propagating in the fibre. Although digital nonlinearity compensation was validated to be promising for mitigating Kerr nonlinearities, the impact of spectral broadening on nonlinearity compensation has never been quantified. In this paper, the performance of multi-channel digital back-propagation (MC-DBP) for compensating fibre nonlinearities in Nyquist-spaced optical communication systems is investigated, when the effect of signal spectral broadening is considered. It is found that accounting for the spectral broadening effect is crucial for achieving the best performance of DBP in both single-channel and multi-channel communication systems, independent of modulation formats used. For multi-channel systems, the degradation of DBP performance due to neglecting the spectral broadening effect in the compensation is more significant for outer channels. Our work also quantified the minimum bandwidths of optical receivers and signal processing devices to ensure the optimal compensation of deterministic nonlinear distortions.

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Research on Carrier Recovery Algorithm in Coherent Optical Communication System

Liu

2019

IOP Conf. Ser.: Earth Environ. Sci.

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In coherent optical communication system, the random deviation of optical phase which is caused by the spontaneous emission of laser leads to phase noise, resulting in a random rotation of signal constellation. In order to ensure the reliability of the communication system, carrier phase estimation and recovery are required at the receiver. In this paper, we investigate two traditional carrier phase recovery (CPR) algorithms, including Viterbi&Viterbi phase estimation (VVPE) and blind phase search (BPS) algorithm. On this basis, we also discuss seven improved algorithms. Then we compare and analyze the hardware complexities of eight different CPR algorithms. In addition, the cause of equalization enhanced phase noise (EEPN) and its impact on the carrier phase recovery algorithm are also discussed.

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Mitigation of EEPN in Coherent Optical Systems With Low-Speed Digital Coherence Enhancement

Cited by 9 publications

References 15 publications

Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing

Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing

Digital nonlinearity compensation in high-capacity optical communication systems considering signal spectral broadening effect

Research on Carrier Recovery Algorithm in Coherent Optical Communication System

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