Comprehensive Study of Equalization-Enhanced Phase Noise in Coherent Optical Systems

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

doi:10.1109/jlt.2015.2491363

Cited by 46 publications

(34 citation statements)

References 16 publications

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“…We also plan in future works to further extend our analyses to the impact of non-linear phase noise [13], equalization-enhanced phase noise [18,19], high frequency drifts, constellation imperfections [20] and the use of probabilistic shaping [21], as well as to make comparisons with data-aided CPR methods.…”

Section: Discussionmentioning

confidence: 99%

Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats

Diniz¹,

Fan²,

Ranzini³

et al. 2019

Opt. Express

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We propose, numerically analyze and experimentally demonstrate a low-complexity, modulation-order independent, non-data-aided (NDA), feed-forward carrier phase recovery (CPR) algorithm. The proposed algorithm enables synchronous decoding of arbitrary squarequadrature amplitude modulation (QAM) constellations and it is suitable for a realistic hardware implementation based on block-wise parallel processing. The proposed method is based on principal component analysis (PCA) and it outperforms the well-known and widely used blind phase search (BPS) algorithm at low signal-to-noise ratio (SNR) values, showing much lower cycle slip rate (CSR) both numerically and experimentally. For operation at higher SNR values, a hybrid two-stage implementation combining the proposed method and BPS is also proposed and their performance are investigated benchmarking them against the two-stage BPS (2S-BPS). The complexity of the proposed simple and hybrid methods are evaluated against 2S-BPS and computational complexity savings of 92% and 40% are expected for the simple and hybrid methods, respectively.

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Section: Discussionmentioning

confidence: 99%

Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats

Diniz¹,

Fan²,

Ranzini³

et al. 2019

Opt. Express

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“…It can be found that the use of RF pilot tone can entirely mitigate the LPN from both the Tx and the LO lasers. However, it cannot fully compensate for the EEPN in optical fiber transmission systems since the EEPN actually represents a complicated integration of the phase, the amplitude, and the time jitter noise [10,12,16,29]. When the CPR is implemented using DPD, the results of the PNC using the RF pilot tone in the same 2000 km coherent system are illustrated in Figure 7.…”

Section: Transmission Setup With Rf Pilot Tone Schemementioning

confidence: 99%

“…However, these works only studied the behaviors of RF pilot tones in short-reach systems, where the enhancement effect of fiber dispersion on the LPN was neglected [10,11]. Actually, due to the interplay between the electronic dispersion compensation (EDC) module and the LPN from the local oscillator (LO), a phenomenon of equalization enhanced phase noise (EEPN) is induced and plays a significant role in the carrier phase recovery (CPR) in high-capacity optical communication systems [10][11][12][13][14][15][16]. However, so far, no DSP-based CPR has been developed to effectively compensate for EEPN [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Phase Noise Cancellation in Coherent Communication Systems Using a Radio Frequency Pilot Tone

Jin

Zhang

et al. 2019

Applied Sciences

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Long-haul optical fiber communication employing digital signal processing (DSP)-based dispersion compensation can be distorted by the phenomenon of equalization-enhanced phase noise (EEPN), due to the reciprocities between the dispersion compensation unit and the local oscillator (LO) laser phase noise (LPN). The impact of EEPN scales increases with the increase of the fiber dispersion, laser linewidths, symbol rates, signal bandwidths, and the order of modulation formats. In this work, the phase noise cancellation (PNC) employing a radio frequency (RF) pilot tone in coherent optical transmission systems has been investigated. A 28-Gsym/s QPSK optical transmission system with a significant EEPN has been implemented, where the carrier phase recovery (CPR) was realized using the one-tap normalized least-mean-square (NLMS) estimation and the differential phase detection (DPD), respectively. It is shown that the RF pilot tone can entirely eliminate the LPN and efficiently suppress the EEPN when it is applied prior to the CPR.

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“…In this case, only results from a BPS configuration with 15 taps are shown, as the results are mostly independent of the number of taps used. This is due to nonlinear intermixing of the dispersed signal and the laser phase noise, through a process known as equalization enhanced phase noise (EEPN) [23], as illustrated by the constellations in Figure 8. In this case, we can observe that carrier induced frequency noise is most relevant at low frequencies.…”

Section: Impact On System Performance: Experimentsmentioning

confidence: 99%

Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links

et al. 2016

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Abstract:We discuss the implications of using monolithically integrated semiconductor lasers in high capacity optical coherent links suitable for metro applications, where the integration capabilities of semiconductor lasers make them an attractive candidate to reduce transceiver cost. By investigating semiconductor laser frequency noise profiles we show that carrier induced frequency noise plays an important role in system performance. We point out that, when such lasers are employed, the commonly used laser linewidth fails to estimate system performance, and we propose an alternative figure of merit that we name "Effective Linewidth". We derive this figure of merit analytically, explore it by numerical simulations and experimentally validate our results by transmitting a 28 Gbaud DP-16QAM over an optical link. Our investigations cover the use of semiconductor lasers both in the transmitter side and as a local oscillator at the receiver. The obtained results show that our proposed "effective linewidth" is easy to measure and accounts for frequency noise more accurately, and hence the penalties associated to phase noise in the received signal.

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Comprehensive Study of Equalization-Enhanced Phase Noise in Coherent Optical Systems

Cited by 46 publications

References 16 publications

Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats

Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats

Phase Noise Cancellation in Coherent Communication Systems Using a Radio Frequency Pilot Tone

Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links

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