Laurent Bramerie

Laurent Bramerie
Université de Rennes 1 | UR1 · Ecole Nationale Supérieure des Sciences Appliquées et de Technologie de Lannion (ENSSAT)

PhD

About

269
Publications
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1,547
Citations

Publications

Publications (269)
Conference Paper
A novel approach is proposed for Analog Signal Processing (ASP) in enhanced 50G-PON using analog FFE filters based on MMSE technique. Performance are validated through experimental transmission of electrical NRZ signals.
Conference Paper
Dans cette contribution, nous présentons une étude préliminaire préparant la possibilité d’effectuer une combinaison cohérente de faisceaux portant des données à haut débit d’information pour les communications spatiales à très forte puissance. Nous nous focalisons sur l’impact de l’amplitude du marquage en fréquence utilisé pour la mise en cohéren...
Article
Full-text available
We report on what is, to our knowledge, one of the first realizations of a CBC (coherent beam combining)-based laser emitter carrying a 10.66 Gb/s telecom signal in free-space optics, within the laboratory environment. Two telecom modulations have been tested: NRZ (non-return-to-zero, in amplitude) and DPSK (differential phase-shift keying, in phas...
Conference Paper
Une transmission a 25 Gbit/s est réalisée pour le réseau d’accès FTTH en mode burst. Nous démontrons la capacité de notre système DML-APD à répondre aux besoins de la classe N1 (14-29 dB) du lien montant du standard 50G-PON.
Conference Paper
We experimentally demonstrate a 4λ WDM real-time 100 Gbit/s/λ PAM-4 fiber link supporting 30 km of fiber propagation and 23.5 dB supported channel insertion losses using analog pre-equalization and common semiconductor based optical pre-amplification.
Conference Paper
We experimentally demonstrate a 4λ WDM real-time 100 Gbit/s/λ PAM-4 fiber link supporting 30 km of fiber propagation and 23.5 dB supported channel insertion losses using analog pre-equalization and common semiconductor based optical pre-amplification.
Article
A 100 Gbit/s/ $\lambda $ PAM-4 fiber link with an optical budget of 30 dB and 20 km fiber reach is achieved in real time experiments. This is compliant with class A (20 dB) point to point (PtP) applications as mobile fronthaul for example, and with class N1 (29 dB) point to multipoint (PtMP) for residential market. We used an integrated externally...
Article
The frequency chirping properties of silicon ring resonator modulators (RRMs) are experimentally investigated under sinusoidal modulation. The modulated electric field at the output of an RRM is measured in the time domain thanks to a coherent detection system. The power and phase waveforms are then analyzed in terms of their temporal phase and amp...
Article
Flat electro-optical frequency combs play an important role in a wide range of applications, such as metrology, spectroscopy, or microwave photonics. As a key technology for the integration of optical circuits, silicon photonics could benefit from on-chip, tunable, flat frequency comb generators. In this article, two different architectures based o...
Article
Full-text available
Point to point (PtP), wavelength division multiplexing (WDM) and time division multiplexing (TDM) optical interfaces are discussed as solutions for backhaul, midhaul, and fronthaul networks. The evolution of radio access networks (RANs) for 5G and beyond is introduced and PtP is identified as the most deployed solution, with many transceiver techno...
Conference Paper
We achieve 32.3dB of optical budget and 45km reach transmission in real time with an O-band EAM-DFB and SOA-PIN for 50Gbit/s NRZ standards. A DSP-free transmission was demonstrated with a semi-cooled transmitter.
Conference Paper
The generation of DAC-less 20 Gb/s PAM-4 using a DML and an external modulator is demonstrated. This dual modulation scheme has been transmitted up to 75-km SSMF with similar performance to PAM-4 DAC transmitter.
Conference Paper
We perform a 30dB optical budget burst mode transmission at 25Gbit/s with an EML and a DC-30GHz PIN pre-amplified with an SOA. We demonstrate that the SOA does not deteriorate the quality of the transmission.
Conference Paper
The frequency chirping properties of a silicon ring resonator modulator are experimentally investigated and compared to a numerical model. The influence of the wavelength detuning and the modulation frequency are highlighted for the first time.
Article
A novel joint polarization demultiplexing and IQ imbalance compensation scheme for coherent optical communications that uses global update is proposed and analyzed through numerical simulations. We describe the system model and derive its related equations. Next, we formulate our blind $M$ -QAM arbitrary approach based on EASI algorithm and using...
Article
Filterbank multicarrier based on offset-quadrature amplitude modulation (FBMC/OQAM) is a promising candidate for optical fiber communication systems, thanks to its better time/frequency confinement compared to other multicarrier modulations. Among linear impairments, the compensation of fiber-induced chromatic dispersion (CD) and laser-induced phas...
Article
Full-text available
We demonstrate 20-Gb/s 4-level pulse amplitude modulation (PAM-4) signal generation using a silicon Mach-Zehnder modulator (MZM) in the O-band. The modulator is driven by two independent binary streams, and the PAM-4 signal is thus generated directly on the chip, avoiding the use of power-hungry digital-to-analog converters (DACs). With optimized a...
Conference Paper
We propose a new joint Tx-IQ imbalance compensation and polarization de-multiplexing algorithm for arbitrary M-QAM coherent systems. Evaluated metrics demonstrate its effectiveness as a blind approach compared to cascaded CMA and BASS algorithms. © 2019 The Author(s)
Article
Full-text available
We report on a simple alternative method for the compensation of quadrature imbalance in optical quadrature phase-shift-keying (QPSK) coherent systems. By introducing a new metric, the phase imbalance can be determined and compensated. The proposed method is theoretically and numerically analyzed. In particular, it is shown that the method exhibits...
Conference Paper
In this paper, we present a modified decisiondirected carrier recovery loop for 16-QAM signals. Numerical simulations prove its performance in terms of receiver sensitivity penalty over a Gaussian channel, in the presence of residual frequency offset and for low signal-to-noise ratio, and experimental results validate its potential.
Article
Full-text available
Keeping up with bandwidth requirements in next generation short- and long-reach optical communication systems will require migrating from simple modulation formats such as on-off keying to more advanced formats such as quaternary phase-shift keying (QPSK). In this paper, we report the first demonstration of QPSK signal generation in the O-band usi...
Article
Burst-mode operation of laser arrays suitable for next generation passive optical networks (NG-PON2) employing time and wavelength division multiplexing (TWDM) is impaired by frequency drifts under variable burst duration. In this work, the issue of frequency drifts under burst and wavelength switching operation is addressed in a four-laser array i...
Article
Full-text available
We provide numerical verification of a feed-forward, heterodyne-based phase noise reduction scheme using single-sideband modulation that obviates the need for optical filtering at the output. The main benefit of a feed-forward heterodyne linewidth reduction scheme is the simultaneous reduction of the linewidth of all modes of a mode-locked laser (M...
Conference Paper
The generation of optical SSB signals using a D-EML is demonstrated for NRZ and PAM-4 modulations. Transmission at 10.7 Gb/s of NRZ signals over 100-km SSMF and at 21.4 Gb/s of PAM-4 signals over 50 km is reported.
Conference Paper
This paper review our recent work on silicon modulators based on free carrier concentration, working in the O-band of optical communications (1260 nm - 1360 nm) for short distance applications. 25 Gbit/s OOK modulation is obtained using a driving voltage of 3.3 Vpp , and QPSK dual-drive Mach-Zehnder modulator (DDMZM) operating in the O-band is demo...
Conference Paper
We review our recent results on Si or III-V integrated devices in novel transmitter architectures for IM-DD dispersion-uncompensated links. Methods relying on chirp engineering or SSB generation are demonstrated for multi- and single-carrier modulation formats.
Conference Paper
The complementarity of the frequency responses of IM-DD channels for positive and negative detunings of ring-resonator modulators, obtained as a result of their chirping properties, is exploited to overcome frequency fading limitations in DD-OFDM systems.
Article
Full-text available
Self-seeded cavity lasers appear as attractive colorless sources for dense wavelength division multiplexed passive optical networks. Although this technology has already demonstrated high performance in a number of experiments, the strong multimode behavior of these kilometer-long cavities results in large relative intensity noise (RIN) that can be...
Article
Linear optical sampling (LOS), based on the coherent photodetection of an optical signal under test with a low repetition-rate signal originating from a pulsed local oscillator (LO), enables the characterization of the temporal electric field of optical sources. Thanks to this technique, low-speed photodetectors and analog-to-digital converters (AD...
Article
Full-text available
We report on the frequency noise reduction performance of a feed-forward technique. The Letter is based on frequency noise measurements that allow the spectral response of the feed-forward phase noise correction to be determined. The main limitation to the noise compensation is attributed to the local oscillator flicker noise and the noise added by...
Conference Paper
20-Gbps QPSK modulation in the O-band is experimentally demonstrated using a simple transmitter structure based on a silicon dual-drive Mach-Zehnder modulator. A power penalty of only 1.5 dB was obtained with respect to the same transmitter structure in LiNbO3.
Conference Paper
Full-text available
A low-complexity feedforward CFO compensation method is proposed and numerically validated for both square and cross M-QAM modulation in optical coherent systems. The proposed method is further compared to state-of-the-art methods and its effectiveness is experimentally verified in a 10-GBaud 16-QAM system.
Conference Paper
A hybrid III-V/SOI directly modulated DFB laser operating at 1.5 μm is fabricated, showing a side mode suppression ratio above 50 dB and a 3-dB bandwidth of 12 GHz. Error-free transmission (BER<10-9) at 10 Gb/s over 66-km SSMF is demonstrated without dispersion compensation and FEC.
Article
Full-text available
We investigate transmitter IQ imbalance compensation based on the blind adaptive source separation (BASS) method in a dual-polarization M -QAM optical coherent system. The robustness of the BASS method against the residual carrier frequency offset (CFO) is numerically investigated and compared to that of the Gram–Schmidt orthogonalization procedure...
Conference Paper
A reconfigurable multi-tap microwave filter is demonstrated on a silicon-on-insulator platform. Compactness and low-power operation are achieved owing to slow-light in photonic crystals. As an example, a microwave band-pass and a stop-band filters are obtained. Channel equalization is also demonstrated on an unitary filter cell.
Article
Full-text available
We propose the use of Manchester encoding in conjunction with balanced detection to overcome the mode partition noise (MPN) limit of quantum-dash Fabry-Perot mode-locked lasers (QD-MLLs) used as multi-wavelength sources in short-reach applications. The proposed approach is demonstrated for a 10-mode laser, each carrying a 10-Gb/s signal. We show th...
Article
The use of a micro-ring resonator (MRR) to enhance the modulation extinction ratio and dispersion tolerance of a directly modulated laser is experimentally investigated with a bit rate of 25 Gb/s as proposed for the next generation data center communications. The investigated system combines a 11-GHz 1.55- $\mu \text{m}$ directly modulated hybrid...
Conference Paper
We demonstrate error-free performance of an MRR filtered DML on the SOI platform over 40- and 81-km of SSMF. The device operates up to 17.5 Gb/s over 81 km and 20 Gb/s over 40 km.
Article
Full-text available
We demonstrate 4 × 10 Gbit/s error-free bidirectional transmission over 2 km of conventional OM1 graded-index multimode fiber using OOK modulation and direct detection. We also perform field transmission to show reach and capacity boosts on legacy multimode infrastructure. Such transmission is enabled by selective mode group division multiplexing,...
Article
A compact silicon-on-insulator 2-tap interferometer is demonstrated as a channel equalizer. The radiofrequency filter is reconfigurable thanks to thermally-controlled photonic crystal couplers and delay lines. The channel fading of a dispersive fiber link supporting a directly modulated telecommunication signal is successfully compensated for using...
Conference Paper
We present the 2 and 4 taps SOI coherent MWP filter devices. The 2 tap unit cell is characterized and shows tap delay tunability and optical phase control thanks to on-chip photodiodes. An optical phase lock loop is successfully implemented for filter stabilization.
Conference Paper
The use of Manchester encoding with balanced detection is proposed in order to overcome the mode partition noise (MPN) limit of quantum-dash mode-locked lasers used as multi wavelength sources. Successful MPN mitigation is demonstrated for a 10-mode laser at 10 Gbit/s.
Conference Paper
We experimentally demonstrate the operating principles of a silicon-on-insulator interferometer for channel equalization purposes. The radio frequency filter is reconfigurable thanks to thermally controlled photonic crystal coupler and delay line.
Conference Paper
A simple feedforward M-QAM carrier phase estimation method is presented and compared to VVMPE-ML and BPS algorithms with 64-QAM and 128-QAM. The laserlinewidth tolerance of the proposed improved method outperforms that of VVMPE-ML and BPS.
Conference Paper
We demonstrate burst mode functionality on a continuous commercial receiver piloted by real-time control plane in an end-to-end sub-wavelength switching test-bed. The results show the receiver can maintain its continuous performance with marginal penalty regardless of data burst absence duration.
Conference Paper
Full-text available
FDMA PON provides high aggregate capacity (20-40Gbps) without requiring the user modules to operate at such high data rate. In this paper, we present for the first time a real time implementation of a FDM receiver in FPGA 1Gbitps in transceiver modules for an ONU and OLT.
Conference Paper
We demonstrate a novel fully integrated, silicon-on-insulator, 16-channel polarization diversity fast reflective slot-blocker with nanosecond switching time, integrating more than 65 functional elements. Its suitability for use in reconfigurable metropolitan networks is assessed.
Conference Paper
Full-text available
Circular harmonic expansion-based carrier frequency offset estimation is investigated for optical M-QAM communication systems. The proposed method, combined with a gradient-descent algorithm, shows better performance compared to already proposed VVMFOE and 4th power methods.
Conference Paper
Full-text available
A novel feedforward M-QAM carrier phase recovery is presented and validated with both square and cross M-QAM up to 128-QAM. The proposed method outperforms the VVMPE-ML method with reduced computational effort and improved linewidth tolerance.
Conference Paper
We present a novel simple blind adaptive compensation method for in-phase/quadrature (IQ) imbalance in m-ary quadrature amplitude modulation (m-QAM) coherent optical fiber communication systems. IQ-imbalance compensation is integrated into butterfly-structured finite impulse response (FIR) filters, resulting in a significant computational effort re...
Conference Paper
We propose a novel cost efficient node architecture for a wavelength division multiplexed packet-switched network based on reflective integrated device. We demonstrate a 16-channel, silicon-on-insulator, reflective monolithic integrated slot-blocker that integrates one arrayed waveguide grating, 16 variable optical attenuators, 16 Bragg grating mir...
Conference Paper
All-optical nonlinear phase noise reduction using an InP-over-SOI PhC nanocavity is experimentally demonstrated for 20-Gbit/s NRZ-QPSK signals. The phase-preserving intensity-limiting function results in an OSNR penalty reduction of 3.5 dB at a BER of 10-3 .
Conference Paper
We experimentally demonstrate the joint use of OFDM and channel flattening effect provided by a Fabry-Perot filter to allow higher than 25 Gbit/s direct intensity modulated, directly detected transmission over up to 75 km SSMF.
Conference Paper
All-optical nonlinear phase noise reduction using an InP-over-SOI PhC nanocavity is experimentally demonstrated for 20-Gbit/s NRZ-QPSK signals. The phase-preserving intensity limiting function results in an OSNR penalty reduction of 3.5 dB at a BER of 10-3.
Article
Full-text available
Recent progresses on monolithic SOI-based integration are presented for achieving high-performance slot-blocker for cost-sensitive metropolitan and datacenter networks. We review several nodes architectures for such optical slot switching ring networks. Such devices integrate up to 65 functional elements, allowing complex operations such as polariz...
Conference Paper
Dans ce papier, nous présentons les résultats d'expériences visant à démontrer le fonctionnement au sein d'un système de transmission optique d'un limiteur de bruit d'amplitude préservant la phase à l'aide d'une nanocavité à cristal photonique. Le dispositif est validé par des mesures de taux d'erreur binaire sur un signal NRZ-QPSK à 20 Gbit/s tran...
Conference Paper
Full-text available
Cette étude théorique vise à démontrer l'utilisation d'un interféromètre optique à base de cristaux photoniques accordables pour compenser la dispersion chromatique d'un lien optique à modulation en intensité et détection directe. Le principe de fonctionnement est présenté pour des transmissions NRZ à 10 Gbit/s après propagation sur 150 km de fibre...
Conference Paper
Full-text available
We demonstrate a 16-channel, silicon-on-insulator, monolithic integrated slot-blocker. This silicon photonic circuit includes two arrayed waveguide gratings, 16 variable optical attenuators and two vertical fiber couplers. We successfully operate it with 56 Gb/s and 80 Gb/s QPSK optical packets.
Conference Paper
Full-text available
A graded-index multi-mode fiber has been optimized to sustain a single excited mode when coupled with a standard single-mode fiber at 1310/1550nm while offering large effective modal bandwidth at 850nm under VCSEL excitations. Modeling and experimental results are presented.
Conference Paper
A photonic crystal molecule is used as an all-optical gate to perform sampling of microwave signals. We demonstrate a very linear operation over a 50dB still with a 1.2mW power consumption.
Conference Paper
We present a simple alternative method for the compensation of quadrature imbalance in optical quadrature phase-shift-keying (QPSK) coherent systems. The method is based on the determination and the compensation of the phase mismatch by the introduction of a relevant signal-to-noise ratio metric. The principle is validated numerically and the algor...
Conference Paper
Full-text available
We present for the first time the experimental demonstration of a Real-Time control-plane on the Multi-hEad sub-wavElength swiTching (MEET), Metro architecture. The key control assets are calculated and provided to the edge nodes in a form of grant files. These grant files eliminate the contention possibility at source nodes and destinations, thus...