All-ETDM 80-Gbaud (640-Gb/s) PDM 16-QAM Generation and Coherent Detection

Raybon, G.; Adamiecki, A.; Randel, Sebastian; Schmidt, Christian; Winzer, Peter J.; Konczykowska, A.; Jorge, F.; Dupuy, J.-Y.; Buhl, L.L.; Chandrasekhar, S.; Liu, Xiang; Gnauck, A.H.; Scholz, C.; Delbue, R.

doi:10.1109/lpt.2012.2203118

Cited by 12 publications

(2 citation statements)

References 9 publications

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“…This method typically works well for producing four‐level signals from two binary inputs. Two such four‐level signals can then be applied to the inputs of an optical I/Q modulator to generate a 16‐QAM optical signal, which has been demonstrated at 56 GBaud [53] and more recently at symbol rates as high as 80 GBaud [36]. A larger number of electrical levels can be generated by resistive combining, although the requirements on the electrical components and the quality of the binary signals become increasingly stringent.…”

Section: State‐of‐art High Spectral Efficiency Format Generationmentioning

confidence: 99%

High speed multi-level drivers for spectrally efficient optical transmission systems

et al. 2013

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High spectral efficiency modulation is key to addressing the optical network capacity challenge. Typical implementations of transmitters for advanced modulation formats use high‐resolution silicon digital‐to‐analog converters, complemented by high bandwidth linear amplifiers to drive the electro‐optic modulator. To overcome the limitations of this setup, both in speed and complexity, Bell Labs has proposed and realized an alternative approach based on a multi‐level driver which operates at symbol rates up to 50 GBaud with swings up to 2×2 volts, sufficient to drive various common electro‐optic modulators (Vπ ∼3‐4 V). Over the past two years, multi‐level drivers have enabled various Bell Labs optical system experiments relying on the high signal quality achieved and the rate flexibility offered. The circuit architecture, its main features, and the various system experiments are summarized. © 2013 Alcatel‐Lucent.

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Section: State‐of‐art High Spectral Efficiency Format Generationmentioning

confidence: 99%

High speed multi-level drivers for spectrally efficient optical transmission systems

et al. 2013

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“…S PECTRALLY efficient modulation formats have attracted significant research interest for the next-generation of optical coherent systems targeting data rates of 400 Gbit/s and beyond on a single optical carrier [1], [2]. An increase in spectral efficiency can be achieved by employing higher order modulation formats such as 16-ary quadrature amplitude modulation where the spectral efficiency is doubled compared to quaternary phase-shift keying (QPSK).…”

Section: Introductionmentioning

confidence: 99%

Carrier-Phase Estimation for 16-QAM Optical Coherent Systems Using QPSK Partitioning With Barycenter Approximation

Fatadin

Ives

Savory

2014

J. Lightwave Technol.

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This paper presents a hardware-efficient carrier phase estimator with high-linewidth tolerance for 16-QAM optical coherent systems. The laser phase noise is estimated using quaternary phase-shift keying (QPSK) partitioning complemented with a low complexity angle-based barycenter approximation as opposed to the classical Viterbi and Viterbi algorithm. The various stages necessary for partitioning and removing the modulation on the received symbols for carrier phase recovery are presented. We show that the phase offset in the middle ring for a 16-QAM constellation can be removed through a simple comparison with the symbols lying on the inner and outer rings of the constellation thus enabling all the symbols to be efficiently utilized for carrier phase recovery. We assess the performance of different filter structures for 16-QAM with filter half width 8 and 16. Simulation results demonstrate that combined linewidth symbol duration product Δν · T s of 10 −4 is tolerable at the target BER of 10 −2 and 10 −3 when using the barycenter algorithm. Finally, carrier phase recovery in a 16-QAM experiment is investigated to validate the performance of the proposed algorithm.Index Terms-Barycenter algorithm, carrier phase recovery, QPSK partitioning, quadrature amplitude modulation (QAM). 0733-8724

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