Showing papers by "Marc Sorel published in 2016"
TL;DR: Automatic reconfiguration and feedback controlled routing is demonstrated in an 8 × 8 silicon photonic switch fabric based on Mach-Zehnder interferometers, making the switch fabric robust against thermal crosstalk, even in the absence of a cooling system for the silicon chip.
Abstract: Automatic reconfiguration and feedback controlled routing is demonstrated in an $8 \times 8$ silicon photonic switch fabric based on Mach–Zehnder interferometers. The use of noninvasive contactless integrated photonic probes (CLIPPs) enables real-time monitoring of the state of each switching element individually. Local monitoring provides direct information on the routing path, allowing an easy sequential tuning and feedback controlled stabilization of the individual switching elements, thus making the switch fabric robust against thermal crosstalk, even in the absence of a cooling system for the silicon chip. Up to 24 CLIPPs are interrogated by a multichannel integrated ASIC wire bonded to the photonic chip. Optical routing is demonstrated on simultaneous WDM input signals that are labeled directly on-chip by suitable pilot tones without affecting the quality of the signals. Neither preliminary circuit calibration nor lookup tables are required, being the proposed control scheme inherently insensible to channels power fluctuations.
53 citations
TL;DR: The SNSPD is fabricated from an amorphous Mo83Si17 thin film chosen to give excellent substrate conformity and exhibits a uniform photoresponse under perpendicular illumination, corresponding to a maximum system detection efficiency of approximately 5% at 1550 nm wavelength.
Abstract: We present low temperature nano-optical characterization of a silicon-on-insulator (SOI) waveguide integrated SNSPD. The SNSPD is fabricated from an amorphous Mo83Si17 thin film chosen to give excellent substrate conformity. At 350 mK, the SNSPD exhibits a uniform photoresponse under perpendicular illumination, corresponding to a maximum system detection efficiency of approximately 5% at 1550 nm wavelength. Under these conditions 10 Hz dark count rate and 51 ps full width at half maximum (FWHM) timing jitter is observed.
40 citations
TL;DR: In this article, a source of correlated photon pairs was demonstrated in future integrated quantum photonic circuits, which utilizes spontaneous four-wave mixing (SFWM) in a dispersion-engineered nanowaveguide made of AlGaAs.
Abstract: We demonstrate a source of correlated photon pairs which will have applications in future integrated quantum photonic circuits. The source utilizes spontaneous four-wave mixing (SFWM) in a dispersion-engineered nanowaveguide made of AlGaAs, which has merits of negligible two-photon absorption and low spontaneous Raman scattering (SpRS). We observe a coincidence-to-accidental (CAR) ratio up to 177, mainly limited by propagation losses. Experimental results agree well with theoretical predictions of the SFWM photon pair generation and the SpRS noise photon generation. We also study the effects from the SpRS, propagation losses, and waveguide lengths on the quality of our source.
36 citations
TL;DR: An integrated approach to produce orbital angular momentum (OAM) superposition states has been demonstrated by integrating a superimposed angular grating in one silicon micro-ring resonator.
Abstract: An integrated approach to produce photonic orbital angular momentum (OAM) superposition states with arbitrary OAM spectrum has been demonstrated. Superposition states between two vector OAM modes have been achieved by integrating a superimposed angular grating in one silicon micro-ring resonator, with each mode having near equal weight. The topological charge difference between the two compositional OAM modes is determined by the difference between the numbers of elements in the two original gratings being superimposed, while the absolute values of the topological charge can be changed synchronously by switching WGM resonant wavelengths. This novel approach provides a scalable and flexible source for the OAM-based quantum information and optical manipulation applications.
36 citations
TL;DR: The impact of nonlinearity-induced resonance wavelength shift of the optical vortex emitter on the analog link performance as increasing the input optical power is studied.
Abstract: We experimentally demonstrate and evaluate the performance of an analog signal transmission system with photonic integrated optical vortex emitter and 3.6-km few-mode fiber (FMF) link using orbital angular momentum (OAM) modes. The fabricated photonic integrated device is capable of emitting vector optical vortices carrying well-defined and quantized OAM modes with topological charge l=−2 and 2. After propagating through 3.6-km FMF, we measure and assess the spurious free dynamic range of the second-order harmonic distortion. Moreover, we study the impact of nonlinearity-induced resonance wavelength shift of the optical vortex emitter on the analog link performance as increasing the input optical power.
25 citations
TL;DR: In this article, the authors describe the development and optical characterization of a planar medium infrared (mid-IR) InSb photodetector on a GaAs substrate technology, capable of integrating MESFETs, to demonstrate a new active pixel device architecture.
Abstract: We describe the development and optical characterization of a planar medium infrared (mid-IR) InSb photodetector on a GaAs substrate technology, capable of integrating MESFETs, to demonstrate a new active pixel device architecture. Our results pave the way for the development of integrated mid-IR focal plane array circuits on a single chip. Device structures with areas down to 0.0016 mm $^{{ {2}}}$ were investigated. By deploying a silicon nitride passivation layer, we were able to reduce leakage current in reverse bias by up to 27% to yield an improved rectifier. Extensive optical characterization was carried out in the near- and mid-IR wavelength range. Responsivities of up to 3.54 A/W and quantum efficiency values above unity were obtained in the near-IR range as a consequence of illumination above the bandgap causing impact ionization. In the mid-IR range, responsivities of up to 0.97 A/W were observed. The bandwidth of the devices proved compatible with video-rate standard sampling rates.
16 citations
20 Mar 2016
TL;DR: A 4-channel silicon photonic MIMO demultiplexer performing all-optical unscrambling of four mixed modes of 10 Gbit/s channels with less than -20 dB crosstalk is demonstrated.
Abstract: We demonstrate a 4-channel silicon photonic MIMO demultiplexer performing all-optical unscrambling of four mixed modes. Real-time on-chip light monitoring through transparent detectors enables robust demultiplexing of 10 Gbit/s channels with less than −20 dB crosstalk.
16 citations
TL;DR: Square-wave (SW) switching of the lasing direction in a semiconductor ring laser (SRL) is investigated using counter-directional mutual feedback and asymmetric SWs are obtained with a tunable duty cycle.
Abstract: Square-wave (SW) switching of the lasing direction in a semiconductor ring laser (SRL) is investigated using counter-directional mutual feedback. The SRL is electrically biased to a regime that supports lasing in either counter-clockwise (CCW) or clockwise (CW) direction. The CCW and CW modes are then counter-directionally coupled by optical feedback, where the CCW-to-CW and CW-to-CCW feedback are delayed by τ1 and τ2, respectively. The mutual feedback invokes SW oscillations of the CCW and CW emission intensities with a period of T≈τ1+τ2. When τ1=τ2, symmetric SWs with a duty cycle of 50% are obtained, where the switching time and electrical linewidth of the SWs can be reduced to, respectively, 1.4 ns and 1.1 kHz by strengthening the feedback. When τ1≠τ2, asymmetric SWs are obtained with a tunable duty cycle of τ1/(τ1+τ2). High-order symmetric SWs with a period of T=(τ1+τ2)/n can also be observed for some integer n. Symmetric SWs of order n=13 with a period of T=10.3 ns are observed experimentally.
16 citations
TL;DR: Characteristics of the integrated optical vortex beam receiver provide an effective mode-selective receiver for the eigen-modes in orbital angular momentum fiber transmission where the circularly polarized OAM modes can be used as data communications channels in multiplexed communications or as photonic states in quantum information applications.
Abstract: A simple and ultra-compact integrated optical vortex beam receiver device is presented. The device is based on the coupling between the optical vortex modes and whispering gallery modes in a micro-ring resonator via embedded angular gratings, which provides the selective reception of optical vortex modes with definitive total angular momentum (summation of spin and orbital angular momentum) through the phase matching condition in the coupling process. Experimental characterization confirms the correct detection of the total angular momentum carried by the vortex beams incident on the device. In addition, photonic spin-controlled unidirectional excitation of whispering-gallery modes in the ring receiver is also observed, and utilized to differentiate between left- and right-circular polarizations and therefore unambiguously identify the orbital angular momentum of incident light. Such characteristics provide an effective mode-selective receiver for the eigen-modes in orbital angular momentum fiber transmission where the circularly polarized OAM modes can be used as data communications channels in multiplexed communications or as photonic states in quantum information applications.
15 citations
TL;DR: The UK National Quantum Technology Hub in Sensors and Metrology (NPL) as discussed by the authors is one of four flagship initiatives in the UK National of Quantum Technology Program, which brings together experts from the Universities of Birmingham, Glasgow, Nottingham, Southampton, Strathclyde and Sussex.
Abstract: The UK National Quantum Technology Hub in Sensors and Metrology is one of four flagship initiatives in the UK National of Quantum Technology Program. As part of a 20-year vision it translates laboratory demonstrations to deployable practical devices, with game-changing miniaturized components and prototypes that transform the state-of-the-art for quantum sensors and metrology. It brings together experts from the Universities of Birmingham, Glasgow, Nottingham, Southampton, Strathclyde and Sussex, NPL and currently links to over 15 leading international academic institutions and over 70 companies to build the supply chains and routes to market needed to bring 10–1000x improvements in sensing applications. It seeks, and is open to, additional partners for new application development and creates a point of easy open access to the facilities and supply chains that it stimulates or nurtures.
11 citations
TL;DR: In this paper, the theoretical framework and experimental progress of integrated photonics for the manipulation of optical vortices were reviewed, as well as their potential applications range from optical communications, optical manipulation, imaging, sensing, and quantum information.
Abstract: Optical vortices (OVs) refer to a class of cylindrical optical modes with azimuthally varying phase terms arising either from polarization rotation or from the angular projection of the wave vector that at the quantum level corresponds to photon spin or orbital angular momenta. OVs have attracted the attention of researchers in many areas of optics and photonics, as their potential applications range from optical communications, optical manipulation, imaging, sensing, to quantum information. In recent years, integrated photonics has becomes an effective method of manipulating OVs. In this paper, the theoretical framework and experimental progress of integrated photonics for the manipulation of OVs were reviewed.
TL;DR: In this article, the authors used an eight-band k·p energy band structure model to design novel GaInSb/AlGaInSbsb multiple quantum well (MQW) structures with an emitting mid-infrared waveband of 4-5 μm.
TL;DR: In this paper, the state-of-the-art in the field of OAM of light, reports recent developments in silicon integrated OAM emitters, and discusses the applications potentials and challenges in silicon-integrated OAM devices which can be used in future OAM based optical communications systems.
Abstract: Emerging applications based on optical beams carrying orbital angular momentum (OAM) will likely require photonic integrated devices and circuits for miniaturization, improved performance and enhanced functionality. This paper reviews the state-of-the art in the field of OAM of light, reports recent developments in silicon integrated OAM emitters, and discusses the applications potentials and challenges in silicon integrated OAM devices which can be used in future OAM based optical communications systems.
10 Jul 2016
TL;DR: In this paper, the insertion of mobile ions and coupled changes of electron concentration are exploited to induce a nonvolatile and reversible change of the optical properties of mixed ionic and electronic conductors (MIECs).
Abstract: The insertion of mobile ions and coupled changes of electron concentration are exploited to induce a non-volatile and reversible change of the optical properties of mixed ionic and electronic conductors (MIECs). The physical mechanisms responsible for the change of the real and imaginary part of the MIECs' refractive index upon ion-intercalation are extensively investigated in the visible and near-IR range. Applications of the proposed electrochemically driven optical actuators are discussed for the manipulation of the light in an optical chip.
20 Mar 2016
TL;DR: A platform for the feedback control of a multichannel transmitter based on DML sources and a silicon photonic multiplexer and carver circuit is presented.
Abstract: We present a platform for the feedback control of a multichannel transmitter based on DML sources and a silicon photonic multiplexer and carver circuit. Automatic tuning and wavelength locking are demonstrated in about 150 ms.
TL;DR: In this paper, the authors demonstrate enhanced wavelength conversion in a Q=7500 deeply etched AlGaAs-nanowaveguide microresonator via degenerate continuous-wave four-wave mixing with a pump power of 24 mW.
Abstract: We experimentally demonstrate enhanced wavelength conversion in a Q=7500 deeply etched AlGaAs-nanowaveguide microresonator via degenerate continuous-wave four-wave mixing with a pump power of 24 mW. The maximum conversion efficiency is -43 dB and accounts for 12 dB enhancement compared to that of a straight nanowaveguide. The experimental results and theoretical predictions agree very well and show optimized conversion efficiency of -15 dB. This work represents a step toward realizing a fully integrated optical devices for generating new optical frequencies.
20 Mar 2016
TL;DR: This work reports on the recent achievements on the development of an integrated in-line transparent detector (CLIPP), enabling non-invasive on-chip monitoring of the light and robust feedback controlled schemes for high complexity photonic integrated circuits.
Abstract: We report on our recent achievements on the development of an integrated in-line transparent detector (CLIPP), enabling non-invasive on-chip monitoring of the light and robust feedback controlled schemes for high complexity photonic integrated circuits.
08 Nov 2016
TL;DR: In this paper, an integrated photonic orbital angular momentum beam multiplexer consisting of four nested arc waveguide gratings was demonstrated, and well-defined OAM mode emissions over wide bandwidth of 1-nm enabled simultaneous wavelength division multiplexing and OAM multiplexings.
Abstract: We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of four nested arc waveguide gratings. Well-defined OAM mode emissions over wide bandwidth of 1-nm enables simultaneous wavelength division multiplexing and OAM multiplexing.
01 Oct 2016
TL;DR: In this article, a phase-locked laser diode based on a passive array of 1×2 multi-mode interference couplers and quantum well intermixing techniques is presented.
Abstract: We report a phase locked laser diode based on a passive array of 1×2 multi-mode interference couplers and quantum well intermixing techniques which shows stable and clear coherence far field patters from both active and passive side up to at least 9 times threshold current.
01 Jun 2016
TL;DR: The ROAM project as mentioned in this paper investigates the orbital angular momentum (OAM) modes of light for communications and networking applications, which are exploited as a disruptive means of increasing fiber transmission capacity and as switching resource to improve the switches scalability and power consumption in data-centre scenarios.
Abstract: The ROAM (Revolutionizing optical fiber transmission and networking using the Orbital Angular Momentum of light) project investigates the orbital angular momentum (OAM) modes of light for communications and networking applications. OAM modes are exploited as a disruptive means of increasing fibre transmission capacity and as switching resource to improve the switches scalability and power consumption in data-centre scenarios.
01 Jan 2016
TL;DR: In this article, a 4-channel silicon photonic MIMO demultiplexer performing all-optical unscrambling of four mixed modes using a mesh of cascaded Mach-Zehnder interferometers (MZIs) is demonstrated.
Abstract: Mode-division multiplexing (MDM) is a promising approach to boost the capacity of optical fibers [1]. Yet coherent detection and power hungry multiple-input multipleoutput (MIMO) digital signal processing (DSP) are typically required to unscramble mixed modes. Here, we demonstrate a 4-channel silicon photonic MIMO demultiplexer performing all-optical unscrambling of four mixed modes using a mesh of cascaded Mach-Zehnder interferometers (MZIs). Demultiplexing of 10 bits channels with less than -20 dB crosstalk and with a power penalty of 1.5 dB at BER level of 10-8 is achieved.
05 Jun 2016
TL;DR: In this article, the authors demonstrate silicon photonic orbital angular momentum multiplexing devices based on mulitmode microring resonator, where up to four optical beams carrying different angular momentum states can be selectively excited from different input ports.
Abstract: We demonstrate silicon photonic orbital angular momentum multiplexing devices based on mulitmode microring resonator. Up to four optical beams carrying different orbital angular momentum states can be selectively excited from different input ports.
Proceedings Article•
03 Jul 2016TL;DR: In this article, the authors demonstrate all-optical unscrambling of four 10Gb/s mixed modes on a silicon photonic chip with less than −20 dB crosstalk and with a power penalty between 2 and 1dB at BER level of 10−8.
Abstract: We demonstrate all-optical unscrambling of four 10Gb/s mixed modes on a silicon photonic chip with less than −20 dB crosstalk and with a power penalty between 2 and 1dB at BER level of 10−8.
01 Aug 2016
TL;DR: In this paper, a highly directional integrated silicon photonic vortex beam emitter based on an Archimedean spiral adiabatic waveguide with angular grating was demonstrated.
Abstract: We demonstrate a highly directional integrated silicon photonic vortex beam emitter based on an Archimedean spiral adiabatic waveguide with angular grating. Various order orbital angular momentum modes can be selectively generated by the emitter at different wavelength and the side-mode superposition ratio is as large as 13.6 dB.
20 Mar 2016
TL;DR: This work experimentally demonstrates and evaluates the performance of analog signal transmission system with photonic integrated optical vortex emitter and 3.6 km few-mode fiber link using OAM2 and OAM-2 modes and measured the spurious free dynamic range (SFDR) of the second-order harmonic distortion (SHD).
Abstract: We experimentally demonstrate and evaluate the performance of analog signal transmission system with photonic integrated optical vortex emitter and 3.6 km few-mode fiber (FMF) link using OAM2 and OAM-2 modes and measured the spurious free dynamic range (SFDR) of the second-order harmonic distortion (SHD).
09 May 2016
TL;DR: In this paper, an L-band WDM transmitter exploiting a feedback-controlled Si photonic circuit for channel multiplexing and extinction ratio enhancement of four DML sources is demonstrated.
Abstract: We present an L-band WDM transmitter exploiting a feedback-controlled Si photonic circuit for channel multiplexing and extinction ratio enhancement of four DML sources. 4×10 Gbit/s transmission along a 50-km SMF is demonstrated.
02 Nov 2016
TL;DR: In this article, a silicon photonic cylindrical vector beams emitter was demonstrated, consisting of a micro-ring resonator with angular grating and a resistive heater, capable of generating and tuning azimuthal and radial polarization beams.
Abstract: We experimentally demonstrated a silicon photonic cylindrical vector beams emitter, consisting of a micro-ring resonator with angular grating and a resistive heater. The device is capable of generating and tuning azimuthal and radial polarization beams.
11 Aug 2016
TL;DR: In this article, an analysis of sidewall grating filters with sinusoidal perturbation is presented, and it is shown that the maximum extinction-ratio of the filters is limited by the polarisation scattering in the waveguide.
Abstract: An analysis of sidewall grating filters with sinusoidal perturbation is presented. Measurements indicate that the maximum extinction-ratio of the filters is limited by the polarisation scattering in the waveguide. We show that TM polarisation absorbers and filters offer a simple design solution that can provide extinction ratio values up to 60 dB.
05 Jun 2016
TL;DR: In this paper, an integrated approach to produce orbital angular momentum superposition states has been demonstrated, which is achieved by integrating a superimposed angular grating in one silicon micro-ring resonator.
Abstract: An integrated approach to produce orbital angular momentum (OAM) superposition states has been demonstrated. Superposition states between two vector OAM modes have been achieved by integrating a superimposed angular grating in one silicon micro-ring resonator.
09 Aug 2016
TL;DR: In this paper, a dual polarisation filter based on a cascaded three ring resonator geometry is proposed for tunable four-wave mixing with only 1.8 dB insertion loss.
Abstract: A silicon micro-ring device with tunable four-wave mixing efficiency is presented. The micro-ring is monolithically integrated with a dual polarisation filter based on a cascaded three ring resonator geometry. Four-wave mixing is demonstrated with signal and idler transmitted through the filter with only 1.8 dB of insertion loss. The pump light is rejected with over 62 dB extinction for both TE and TM guided modes.