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316documents trouvés

17401
31/10/2017

Integration of electro-absorption modulator in a vertical-cavity surface-emitting laser

L.MARIGO-LOMBART, S.CALVEZ, A.ARNOULT, A.RUMEAU, C.VIALLON, H.THIENPONT, K.PANAJOTOV, G.ALMUNEAU

PHOTO, TEAM, I2C, MOST, Bruxelles

Rapport LAAS N°17401, Octobre 2017

Lien : https://hal.laas.fr/hal-01614811

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Abstract

VCSELs became dominant laser sources in many short optical link applications such as datacenter, active cables, etc. Actual standards and commercialized VCSEL are providing 25 Gb/s data rates, but new solutions are expected to settle the next device generation enabling 100 Gb/s. Directly modulated VCSEL have been extensively studied and improved to reach bandwidths in the range of 26-32 GHz [Chalmers, TU Berlin], however at the price of increased applied current and thus reduced device lifetime. Furthermore, the relaxation oscillation limit still subsists with this solution. Thus, splitting the emission and the modulation functions as done with DFB lasers is a very promising alternative [TI-Tech, TU Berlin]. Here, we study the vertical integration of an Electro-Absorption Modulator (EAM) within a VCSEL, where the output light of the VCSEL is modulated through the EAM section. In our original design, we finely optimized the EAM design to maximize the modulation depth by implementing perturbative Quantum Confined Stark Effect (QCSE) calculations, while designing the vertical integration of the EAM without penalty on the VCSEL static performances. We will present the different fabricated vertical structures, as well as the experimental electrical and optical static measurements for those configurations demonstrating a very good agreement with the reflectivity and absorption simulations obtained for both the VCSEL and the EAM-VCSEL structures. Finally, to reach very high frequency modulation we studied the BCB electrical properties up to 110 GHz and investigated coplanar and microstrip lines access to decrease both the parasitic capacitance and the influence of the substrate. 100 words: In this presentation, we describe the operation of Multiple-Quantum-Wells Asymmetric Fabry-Perot modulator, vertically integrated into a VCSEL structure for high-speed modulation. First we optimize the Electro-Absorptive Modulator (EAM) and the EAM-VCSEL structures by utilizing a perturbative quantum-confined Stark-effect and transfer matrix calculations. Then we present experimental reflectivity, LIV curves and photocurrent measurements and demonstrate very good agreement with our modelling results. High frequency measurements of BCB electrical response up to 110 GHz are carried out to estimate the parasitic effects due to the pad configuration and the impact of the substrate.

141379
17336
26/10/2017

Phase noise study based on transfer function in coupled optoelectronic oscillators

R.KHAYATZADEH, V.AUROUX, G.BAILLY, A.FERNANDEZ , O.LLOPIS

MOST, I2C

Manifestation avec acte : International Topical Meeting on Microwave Photonics ( MWP ) 2017 du 23 octobre au 26 octobre 2017, Beijing (Chine), Octobre 2017, 4p. , N° 17336

Lien : https://hal.laas.fr/hal-01587950

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Abstract

In this paper, the transfer function theory is used to model the phase noise power spectral density in coupled optoelectronic oscillators. A resonator is placed into the model in order to take into account the quality factor (Q) enhancement due to the optical loop. The results of this model are then compared with experimental measurement results. The model is able to describe the phase noise spectrum shape and to give indications on the noise contributors, which helps in improving oscillator's performance.

141077
17505
23/10/2017

Experimental design of a low phase noise coupled optoelectronic oscillator at 10GHz

O.LELIEVRE, V.CROZATIER, G.BAILI, P.NOUCHI, D.DOLFI, L.MORVAN, F.GOLDFARB, F.BRETENAKER, O.LLOPIS

Thales R&T, LAC, MOST

Manifestation avec acte : International Topical Meeting on Microwave Photonics ( MWP ) 2017 du 23 octobre au 26 octobre 2017, Beijing (Chine), Octobre 2017, 4p. , N° 17505

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Abstract

We present an experimental study on two key elements to design a low phase noise coupled optoelectronic oscillator (COEO). Fiber lengths and dispersions are investigated to highlight the differences between the optical and optoelectronic loops. After optimization, a 10 GHz COEO at 1.5 μm with a total of 590 m of fiber exhibits phase noise levels of -125 dBc/Hz at 1 kHz and -140 dBc/Hz at 10 kHz.

142277
17504
01/10/2017

A Model for Designing Ultralow Noise Single- and Dual-Loop 10-GHz Optoelectronic Oscillators

O.LELIEVRE, V.CROZATIER, P.BERGER, G.BAILI, O.LLOPIS, D.DOLFI, P.NOUCHI, F.GOLDFARB, F.BRETENAKER, L.MORVAN, G.PILLET

Thales R&T, MOST, LAC

Revue Scientifique : Journal of Lightwave Technology, Vol.35, N°20, pp.4366-4374, Octobre 2017 , N° 17504

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Abstract

A complete model describing both single- and dual-loop optoelectronic oscillators (OEO) is introduced. It is compared to several experimental configurations, with excellent agreement in all cases. The physical insight into noise coupling mechanisms brought by the model further allows us for the design of ultralow noise OEO. Phase noise performances at 10 GHz with a single 1 km delay line and with a dual 1 km/100 m delay lines are reported. An optimized dual loop configuration exhibits low phase noise floor at high offset frequency (-160 dBc/Hz at 100 kHz) and low spur levels (-145 dBc/Hz), here again in close agreement with our model.

142275
17254
13/07/2017

COEO Phase locking and performance optimisation

R.KHAYATZADEH, V.AUROUX, A.FERNANDEZ , O.LLOPIS

MOST

Manifestation avec acte : Joint conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum ( IFCS-EFTF ) 2017 du 10 juillet au 13 juillet 2017, Besançon (France), Juillet 2017, 4p. , N° 17254

Lien : https://hal.archives-ouvertes.fr/hal-01568062

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Abstract

In this paper, a coupled optoelectronic oscillator (COEO) is phase locked to a low noise RF oscillator in order to reduce the phase noise close to the carrier. Biasing current of the optical semiconductor amplifier (SOA) and a varactor diode in the RF part of the COEO are used as two different actuators to perform phase locking. The lock on the optical device is finally simpler and more efficient than the lock on the RF loop. In the second part of this paper, phase noise of the COEO is reduced by more than 15 dB using a chirped Bragg filter that compensates the dispersion of the optical loop.

140603
17506
13/07/2017

Low phase noise 10GHz coupled optoelectronic oscillator

O.LELIEVRE, V.CROZATIER, G.BAILI, P.NOUCHI, D.DOLFI, L.MORVAN, F.GOLDFARB, F.BRETENAKER, O.LLOPIS

Thales R&T, LAC, MOST

Manifestation avec acte : Joint conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum ( IFCS-EFTF ) 2017 du 10 juillet au 13 juillet 2017, Besançon (France), Juillet 2017, 2p. , N° 17506

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Abstract

We present our recent results on a 10 GHz coupled optoelectronic oscillator (COEO). With a total of 550 m of fiber, the COEO exhibits phase noise level of -140 dBc/Hz at 10 kHz and -137 dBc/Hz for the first spur.

142279
17244
13/07/2017

Active devices choice and design of an all cryogenic superconductor resonator oscillator

D.CHAUDY, O.LLOPIS, B.MARCILHAC, O.D'ALLIVY KELLY, J.M.HODE

MOST, UMP Thalès, Thales Airborne Systems

Manifestation avec acte : Joint conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum ( IFCS-EFTF ) 2017 du 10 juillet au 13 juillet 2017, Besançon (France), Juillet 2017, 4p. , N° 17244

Lien : https://hal.archives-ouvertes.fr/hal-01568097

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Abstract

Several silicon-germanium bipolar transistors have been measured at cryogenic temperature regarding their gain and phase noise performance. The electrical model of the chosen device has been extracted. Using this model, the phase noise performance of a cryogenic superconductor oscillator has been simulated. The results are very promising, with a phase noise level of-155 dBc/Hz at 1 kHz offset from of a 1 GHz carrier.

140572
17507
13/07/2017

In-situ dispersion measurement of a coupled optoelectronic oscillator

O.LELIEVRE, V.CROZATIER, G.BAILI, P.NOUCHI, D.DOLFI, L.MORVAN, F.GOLDFARB, F.BRETENAKER, O.LLOPIS

Thales R&T, LAC, MOST

Manifestation avec acte : Joint conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum ( IFCS-EFTF ) 2017 du 10 juillet au 13 juillet 2017, Besançon (France), Juillet 2017, 2p. , N° 17507

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142281
17243
10/07/2017

Development of a mobile HTS cryogenic oscillator

O.D'ALLIVY KELLY, Y.LEMAITRE, B.MARCILHAC, D.CHAUDY, J.M.HODE, O.LLOPIS

UMP Thalès, Thales Airborne Systems, MOST

Manifestation avec acte : Joint conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum ( IFCS-EFTF ) 2017 du 10 juillet au 13 juillet 2017, Besançon (France), Juillet 2017, 2p. , N° 17243

Lien : https://hal.archives-ouvertes.fr/hal-01568824

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Abstract

High-temperature superconductors (HTS) have shown their potential for analog signal processing at microwave frequencies; they provide high Q resonators, the most critical component of an efficient low phase noise oscillator. Thus, a strategy to outperform state of art quartz oscillators could consist in integrating, in a monolithic block, a planar HTS resonator and a cryo-compatible transistor to build a 1 GHz oscillator. However, mobile systems may require reducing hardware size, weight and power consumption while meeting high performances, controlled costs and reliability needs. We discuss these questions and present our approach to validate the integration of HTS based oscillators into embedded systems.

140555
17261
03/07/2017

Simulation numérique itérative pour la génération de peignes Kerr : optimisation de la fonction de couplage

N.GUTIERREZ PANOZZO, C.ARLOTTI, A.FERNANDEZ , S.CALVEZ, O.LLOPIS

MOST, PHOTO

Manifestation avec acte : Journée du Club Optique Micro-onde ( JCOM ) 2017 du 03 juillet au 03 juillet 2017, Limoges (France), Juillet 2017, 2p. , N° 17261

Lien : https://hal.archives-ouvertes.fr/hal-01568063

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Résumé

On présente un méthode numérique qui permet de simuler la formation de peignes Kerr par le biais de résonateurs optiques tout en tenant compte du comportement en fréquence du coupleur d’accès du résonateur.

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