Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning

Fatadin, Irshaad; Ives, D. J. G.; Savory, Seb J.

doi:10.1109/lpt.2010.2043524

Cited by 231 publications

(91 citation statements)

References 10 publications

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“…The non-data-aided frequency correction removed the frequency offset between the lasers [8] and a 20-symbol training sequence was employed to achieve symbol synchronization. Many algorithms have been developed for carrier phase recovery in digital coherent receiver including the least mean-squared (LMS) algorithm [1], decisiondirected phase-locked loop [9,10], decision-aided maximum likelihood phase estimation [11], blind phase search technique [12], and QPSK partitioning algorithm [13]. In this work, we developed a first order decision-directed phase-locked loop (DD-PLL) [9] as shown by the block diagram in Fig.…”

Section: Experiments Setupmentioning

confidence: 99%

Effects of phase noise of monolithic tunable laser on coherent communication systems

Huynh¹,

Smyth²,

Nguyen³

et al. 2012

Opt. Express

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Abstract:We investigate the effects of different phase noise processes of SGDBR laser on coherent systems. The SGDBR device operated well with QPSK modulation at 5 Gbaud, while the performance of 16-QAM was significantly degraded due to excess noise. The white FM noise mainly defines the ultimate performance of coherent reception, but the low frequency excess noise can potentially degrade the performance of systems that employ 16-QAM format at 5 Gbaud.

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Section: Experiments Setupmentioning

confidence: 99%

Effects of phase noise of monolithic tunable laser on coherent communication systems

Huynh¹,

Smyth²,

Nguyen³

et al. 2012

Opt. Express

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“…Alternatively, the signals in the inner and outer circle of a 16-QAM constellation can actually be used in the standard VVPE as a coarse phase estimate. Identifying these symbols for VVPE is known as QPSK partitioning [5]. A second-stage of maximum likelihood (ML) phase estimate can further refine the estimation accuracy.…”

Section: Carrier Phase Estimation(cpe) For 16-qam Systems and Beyondmentioning

confidence: 99%

Beyond 100 Gb/s: Advanced DSP techniques enabling high spectral efficiency and flexible optical communications

Lau¹,

Lu²

2013

2013 12th International Conference on Optical Communications and Networks (ICOCN)

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“…High-order modulation formats impose stringent requirements on the performance of these algorithms, as the distance between constellation points reduces with the increase in modulation order. The blind phase search (BPS) algorithm [2] and the N-th power approach [3] have typically been proposed for CPR in square multilevel quadrature amplitude modulations (Sq-mQAM) [4][5][6]. Although the BPS algorithm achieves a high phase noise tolerance, it requires a large computational complexity especially for high-order modulations where the required number of test phases increases.…”

Section: Introductionmentioning

confidence: 99%

Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems

Navarro¹,

Kakkar

Pang³

et al. 2016

Photonics

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A novel two-stage n-PSK partitioning carrier phase recovery (CPR) scheme for circular multilevel quadrature amplitude modulation (C-mQAM) constellations is presented. The first stage of the algorithm provides an initial rough estimation of the received constellation, which is utilized in the second stage for CPR. The performance of the proposed algorithm is studied through extensive simulations at the forward error correction bit error rate targets of 3.8ˆ10´3 and 1ˆ10´2 and is compared with different CPR algorithms. A significant improvement in the combined linewidth symbol duration product (∆νT s ) tolerance is achieved compared to the single-stage n-PSK partitioning scheme. Superior performance in the ∆νT s tolerance compared to the blind phase search algorithm is also reported. The relative improvements with respect to other CPR schemes are also validated experimentally for a 28-Gbaud C-16QAM back-to-back transmission system. The computational complexity of the proposed CPR scheme is studied, and reduction factors of 24.5 | 30.1 and 59.1 | 63.3 are achieved for C-16QAM and C-64QAM, respectively, compared to single-stage BPS in the form of multipliers | adders.

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Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning

Cited by 231 publications

References 10 publications

Effects of phase noise of monolithic tunable laser on coherent communication systems

Effects of phase noise of monolithic tunable laser on coherent communication systems

Beyond 100 Gb/s: Advanced DSP techniques enabling high spectral efficiency and flexible optical communications

Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems

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