Jean-Claude Simon

French National Centre for Scientific Research | CNRS · Section d'Electronique

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...

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...

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...

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.

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...

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.

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.

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.

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.

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.

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.

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...

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...

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 .

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.

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.

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...

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...

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...

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.

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...

We report on the use of an InP/silicon-on-insulator hybrid photonic crystal nanocavity for the realization of a phase-preserving all-optical power limiter. This function is experimentally demonstrated with 20-Gbit/s nonreturn-to-zero quadrature phase-shift-keying signals. Histogram-based measurements of the phase distributions indicate negligible v...

Ultrahigh-speed optical transmission technology, such as optical time domain multiplexing or optical signal processing is a key point for increasing the communication capacity. The system performances are strongly related to pulse properties. We present an original method dedicated to short pulse-shape characterization with high repetition rate usi...

We propose in this communication an experimental study of the relaxation oscillations behavior in mode-locked lasers. The semiconductor self-pulsating laser diode is composed by two gain sections, without saturable absorber. It is made of bulk structure and designed for optical telecommunication applications. This specific device allows two differe...

This paper presents a theoretical and experimental investigation of optical signal regeneration properties of a non-linear optical loop mirror using a semiconductor optical amplifier as the active element (SOA-NOLM). While this device has been extensively studied for optical time division demultiplexing (OTDM) and wavelength conversion applications...

Photonic crystal cavity-based switching is studied both theoretically and experimentally in order to identify the best configuration to maximize “wavelength conversion” efficiency. In particular, it is shown that an enhanced contrast can be reached when the probe is blueshifted with respect to the resonance. The use of an InP/SOI hybrid photonic cr...

Using a 1-mm long photonic crystal waveguide made of Gallium Indium Phosphide, we generate a peak second harmonic power of 45 μW, which correspond to a conversion efficiency of 210-4W-1.

We report very efficient second harmonic generation in membrane photonic crystal waveguide. The combination of absorption-free material and slow-light enhancement enables a large harmonic generation efficiency. A peak pump power of about 450 mW generates up to 45 μW peak second harmonic power over a broad spectral range. The signal is exploited to...

We report on the impact of the sampling-source extinction ratio (ER) in a linear optical sampling system. To this effect, an analytical model is developed and contrasted with experimental data and numerical simulation, to determine the operational limits of the monitoring system. The ER of the reconstructed signal consists of a combined contributio...

We report on the first demonstration of the wavelength demultiplexing of a 100-Gb/s nonreturn to zero signal to four channels at 25 Gb/s, based on resonant structures implemented in GaInP photonic crystals. The device is composed of four filters based on H0 cavities with one common input bus and four drop outputs showing a very small footprint. The...

A report is presented on four-wave-mixing-based all-optical time-domain demultiplexing of a 170.8 Gbit/s signal down to 42.7 Gbit/s in a chalcogenide GeAsSe microstructured fibre. The high nonlinearity of the fibre allows error-free and low power penalty operation with only 56 mW of total input average power.

We report on the design, fabrication, and characterization of a filter for demultiplexing in the wavelength division domain achieved with a H0 cavity on a III-V photonic crystal (PhC) membrane. This device is single mode, the total insertion losses are about 10.5 dB, the drop efficiency is close to 40%, and the channel isolation can exceed 20 dB at...

We report on all-optical wavelength conversion of a 56  Gb/s differential quadrature phase shift keying signal and a 42.7  Gb/s on-off keying signal. Wavelength conversion is based on four-wave mixing effect in a 1 m long highly nonlinear GeAsSe chalcogenide fiber. The high nonlinearity of the fiber allows low-power penalty operation with a total a...

We demonstrate 20 µW second harmonic generation in a photonic crystal waveguide. The collected signal has been used for optical performance monitoring of the chromatic dispersion and optical signal to noise ratio of a 42.5 Gb/s Return to Zero signal all over the C-band.

A 2D photonic crystal 3-ports filter with 6 dB bus insertion losses and drop efficiency of 47 % is reported. Error-free operation with low penalty (<0.5 dB) for OOK and DQPSK modulation formats is demonstrated. OCIS codes: (230.5298) Photonic crystals; (230.7408) Wavelength filtering devices

We report on the investigation of four-wave mixing (FWM) in a long (1.3 mm) dispersion-engineered Gallium Indium Phosphide (GaInP) photonic crystal (PhC) waveguide. A comparison with a non-engineered design is made with respect to measured FWM efficiency maps. A striking different response is observed, in terms of dependence on the pump wavelength...

Session orale : Fibres microstructurées

We demonstrate a fast photodetector (f3dB > 40GHz) integrated into a high-index contrast photonic crystal platform. Device design, fabrication and characterization are presented.

We demonstrated error-free four-wave-mixing-based wavelength conversion of a 42.7-Gbit/s RZ-33% signal in a 1-m long GeAsSe chalcogenide microstructured fiber with a total average power of 56 mW

This paper gives an overview of recent demonstrations of optical 2R regeneration achieved by vertical microcavity mirror-based multiple-quantum-well saturable absorber (SA). The potential of the device to perform wavelength division multiplexing regeneration is first demonstrated through the first pigtailed SA chip implemented with eight independen...

We demonstrated error-free four-wave-mixing-based wavelength conversion of a 42.7-Gbit/s RZ-33% signal in a 1-m long GeAsSe chalcogenide microstructured fiber with a total average power of 56 mW.

Gain dynamics in two quantum-dash semiconductor optical amplifiers of different lengths emitting in the 1.55μm region are investigated experimentally and compared. It is shown that slow gain recovery due to total carrier relaxation is totally suppressed in the ultralong amplifier. Consequently, the 10%–90% gain recovery time is drastically reduced...

We have designed and fabricated a photonic crystal filter intended for demultiplexing in wavelength division domain. This device is single-mode, the total insertion losses are about 12dB and the channel isolation can exceed 25dB. Non return to zero signal at 40Gb/s have been successfully filtered with no penalty in the bit error rate analysis. The...

We theoretically demonstrate the use of a dispersion-managed fiber as the nonlinear fiber of an all-optical regenerator at 160 Gbit/s. The regenerator improves the Q-factor of the signal by a factor of 3.2 dB.

In this paper the authors have demonstrated the enhancement of FWM conversion efficiency and bandwidth in a PhCWG in a slow-light regime. The possibility to transmit a 40 Gbit/s RZ signal with only 1 dB penalty in this regime gives opportunity to optical demultiplexing by FWM.

We investigate wavelength tunable 56-Gb/s differential quaternary phase-shift keying (DQPSK) systems using comb generation in a quantum-dash mode-locked laser for wavelength-division-multiple access (WDM)-based broadcast application. We present relative intensity noise and bit-error-rate measurements for each mode. We demonstrate error-free operati...

The 2R Mamyshev regenerator (MR) [1] relies on the combined effects of self-phase modulation (SPM) and normal dispersion in a fiber to induce an S-shape transfer function (TF). At 160 Gbit/s (pulses of ∼1.5 ps), even with a very low dispersion fiber, the signal still experiences the effect of third-order dispersion β3 that degrades the shape of TF....

Microcavity Saturable absorber is used for phase-preserving amplitude regeneration of RZ-DQPSK signals. The regenerator is assessed in a 28 Gbaud recirculating loop showing system tolerance to nonlinear phase noise and distance improvement.

We report the triple-functionality at 10-Gb/s of an integrated R-EAM-SOA, including modulation, detection and noise-mitigated 2R all-optical regeneration. The results demonstrate its high potential for a multi-operation device in WDM access networks.

This paper reports on all optical frequency down conversion clock recovery based on Quantum-Dash Fabry-Perot mode-locked laser diode (QD-MLLD). A first section is dedicated to the generation of a tunable repetition rate pulse source based on a first QD-MLLD. The principle is to select three lines in the QD-MLLD spectrum with a filtering technique;...

We report here the experimental demonstration of the slow light enhancement of four wave mixing conversion efficiency and bandwidth in III-V photonic crystals waveguides, and 40Gbit/s transmission assessment with BER measurements

Recent results on a new multiple-quantum-well saturable absorber (SA) device allowing fast responding power stabilization are reviewed. Combined with the classical SA achieving extinction ratio improvement, it allows all-optical amplitude-shift-keying 2R signal regeneration. Furthermore its phase-preserving characteristics make it potentially usefu...

A new multiple-quantum-well saturable absorber (SA) device allowing power stabilization is described. Combined with the classical SA achieving extinction ratio improvement, it allows all-optical amplitude-shift-keying 2R signal regeneration. Furthermore its phase-preserving characteristics make it potentially useful to prevent phase noise accumulat...

In this paper, we present a complete study of the pattern sequence length influence in the optical clock recovery (OCR) process using passive filtering. For this analysis, we use a commercial Fabry-Perot filter (FPF) in front of a semiconductor optical amplifier. A 40-GHz optical clock is then recovered from an optical data stream at 40 Gbit/s. The...

We investigate the cascadability of a microcavity-saturable-absorber-based phase-preserving amplitude regenerator for RZ-DPSK signals. The results show that the tolerance of phase-encoded signals to nonlinear phase noise is increased. A distance improvement ratio up to 1.6 is experimentally demonstrated.

We report time resolved measurement of the nonlinear frequency conversion of a high repetition rate (10 GHz) train of short pulses (up to 4 ps) in a 1.5 mm long Photonic Crystal waveguides. We provide direct evidence of fast response through time-resolved optical measurements. The conversion gain of about -40dB is achieved with about 60 mW of avera...

We investigate wavelength tunable 56 Gbit/s DQPSK systems using comb generation in a quantum-dash mode-locked laser. Relative intensity noise and bit error rate is measured for each mode. Error-free operation is obtained over 9 WDM channels with 100 GHz spacing.

Ce papier démontre la faisabilité d'un système WDM-PON à 10 Gbit/s utilisant la diode laser Fabry-Perot verrouillée par injection optique. Un égaliseur électronique est employé au niveau du récepteur pour compenser la faible bande-passante électrique (2,2 GHz) de la diode laser directement modulée en régime de verrouillage. Un budget optique dispon...

We demonstrate a 4×170 Gbit/s DWDM/OTDM transmission experiment using only one quantum dash Fabry-Perot mode-locked laser. BER measurements show a penalty of 1dB at BER=10-9 for back-to-back and error floor for BER=10-8 for transmission over 100 km.

We investigate wavelength tunable 56 Gbit/s DQPSK systems using comb generation in a quantum-dash mode-locked laser. Relative intensity noise and bit error rate is measured for each mode. Error-free operation is obtained over 9 WDM channels with 100 GHz spacing.

We experimentally investigate the operation of a cost-effective wavelength-division-multiplexed passive optical network (WDM-PON) based on wavelength-locked Fabry-Pérot laser diodes (FP-LDs). A single quantum-dash passively mode-locked laser (QD-MLL) is combined with an arrayed waveguide grating in WDM-PON architecture to provide a low-noise, coher...

We experimentally investigate a new generation of multiple-quantum-well semiconductor saturable absorber for all-optical phase-shift-keying signal regeneration. The device under study exhibits a reflectivity which decreases when the input signal power increases. This characteristic can be seen as a power limiting function which could be used for ph...