Showing papers by "Jérôme Bourderionnet published in 2018"
TL;DR: The demonstration of an integrated frequency modulated continuous wave LiDAR on a silicon platform where the waveform calibration, the scanning system, and the balanced detectors are implemented on a chip is presented.
Abstract: We present the demonstration of an integrated frequency modulated continuous wave LiDAR on a silicon platform. The waveform calibration, the scanning system, and the balanced detectors are implemented on a chip. Detection and ranging of a moving hard target at upto 60 m with less than 5 mW of output power is demonstrated in this paper.
120 citations
TL;DR: A novel free space optical interconnect solution for intra-data center networks that utilizes 2D optical beam steering for the transmitter, and high bandwidth wide-area photodiode arrays for the receiver is introduced.
Abstract: Data centers are continuously growing in scale and can contain more than one million servers spreading across thousands of racks; requiring a large-scale switching network to provide broadband and reconfigurable interconnections of low latency. Traditional data center network architectures, through the use of electrical packet switches in a multi-tier topology, has fundamental weaknesses such as oversubscription and cabling complexity. Wireless intra-data center interconnection solutions have been proposed to deal with the cabling problem and can simultaneously address the over-provisioning problem by offering efficient topology re-configurability. In this work we introduce a novel free space optical interconnect solution for intra-data center networks that utilizes 2D optical beam steering for the transmitter, and high bandwidth wide-area photodiode arrays for the receiver. This new breed of free space optical interconnects can be developed on a photonic integrated circuit; offering ns switching at sub-μW consumption. The proposed interconnects together with a networking architecture that is suitable for utilizing those devices could support next generation intra-data center networks, fulfilling the requirements of seamless operation, high connectivity, and agility in terms of the reconfiguration time.
31 citations
TL;DR: Coherent beam combining in tiled-aperture configuration is demonstrated on seven femtosecond fiber amplifiers using an interferometric phase measurement technique and results pave the way to very large high-power and high energy coherent beam combining systems.
Abstract: Coherent beam combining in tiled-aperture configuration is demonstrated on seven femtosecond fiber amplifiers using an interferometric phase measurement technique. The residual phase error between two fibers is as low as λ/55 RMS and a combination efficiency of 48% has been achieved. The combined pulses are compressed to 216 fs, delivering 71 W average power at a repetition rate of 55 MHz. Operating the laser system in a nonlinear regime with an estimated B-integral of 5 rad yields a combining efficiency of 45% with the same phase stability. These results pave the way to very large high-power and high energy coherent beam combining systems.
18 citations
TL;DR: A two dimensional photonic crystal (PhC) resonator, based on a recent design concept, entirely embedded in Silica, is fabricated in a CMOS full-process multiproject wafer, including additional steps such as implantation, metalization, Germanium deposition and planarization.
Abstract: A two dimensional photonic crystal (PhC) resonator, based on a recent design concept, entirely embedded in Silica, is fabricated in a CMOS full-process multiproject wafer, including additional steps such as implantation, metalization, Germanium deposition and planarization. A large loaded Q-factor (5.9 × 105) is achieved without removal of the silica cladding. A statistical analysis over 56 devices leads to an average value for the loaded Q of 4 × 105, in close agreement with calculations. An upper boundary for the fabrication disorder is estimated to 1.2 nm.
13 citations
26 Feb 2018
TL;DR: The XCAN project as discussed by the authors aims at the coherent combination of 61 ampliators in the femtosecond regime, and the first preliminary results with seven amplifiers include a combination of 30% and a residual phase error between two amplifiers as low as /40 rms.
Abstract: The XCAN project aims at the coherent combination of 61 ber ampli ers in the femtosecond regime. An
important intermediate step towards this goal is the implementation of a seven ber test setup, which allows
to address key scienti c and technical challenges which might occur in the scaled version of 61 bers. This
work includes the design and characterization of a support unit able to hold 61 bers with the high precision
required for an ecient coherent combination in tiled aperture con guration. This con guration, in combination
with an interferometric phase measurement and active phase control, is particularly well suited for the coherent
combination of a very large number of beams. Our rst preliminary results with seven bers include a combination
eciency of 30% and a residual phase error between two bers as low as /40 rms. Experiments conducted with
three bers in order to evaluate technical improvements revealed an increase of eciency to 54 %. The combined
beam was temporally compressed to 225 fs, which is Fourier transform limited with respect to the measured
spectrum.
13 May 2018
TL;DR: In this paper, the coherent combination of seven fiber amplifiers in the femtosecond regime using an interferometric phase measurement technique was reported. A combination efficiency of 54 % and a compressed pulse length of 225 fs were achieved.
Abstract: We report on the coherent combination of seven fiber amplifiers in the femtosecond regime using an interferometric phase measurement technique. A combination efficiency of 54 % and a compressed pulse length of 225 fs were achieved.
04 Nov 2018
TL;DR: In this paper, a coherent beam combining of seven fiber chirped-pulse amplifiers using a highly scalable architecture was reported, achieving a combining efficiency of 48% with a phase noise between two fibers as low as λ/38 RMS.
Abstract: We report on the coherent beam combining of seven fiber chirped-pulse amplifiers using a highly scalable architecture. A combining efficiency of 48% is obtained in linear regime, yielding 71 W pump-limited average power after compression, with a phase noise between two fibers as low as λ/38 RMS. The experiment is operated at high B-integral, with only little impact on the combining efficiency as well as on the temporal and spatial properties of the combined beam.