Search

We demonstrate, by using multiple Mach-Zehnder interferometer (MZI)-semiconductor optical amplifier structures, an all-optical synchronous D type flip-flop, with high-photonic integration capability. Experimental performance analysis shows its functional and performance feasibility and high-switching speeds were achieved. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1201-1204, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25998

We present theoretical and experimental performance analysis of 40 Gb/s Non-Return-to-Zero (NRZ) All-Optical Wavelength Conversion (AOWC) using a differentially-biased SOA-MZI. A frequency domain transfer function model for both the standard single-control SOA-MZI-based AOWC and for the differentially-biased SOA-MZI is analytically derived, exploiting first order perturbation theory techniques and showing that only the differentially-biased scheme can yield an almost flat low-pass filtering response enabling wavelength conversion at 40 Gb/s. The theoretically obtained results are also confirmed through experiments that demonstrate successful 40 Gb/s AOWC functionality for NRZ data signals only when a differentially-biased SOA-MZI configuration is employed, whereas an error-floor is obtained when 40 Gb/s NRZ AOWC with the standard single-control SOA-MZI scheme is attempted. The 1.7 dB negative power penalty obtained by the differentially-biased SOA-MZI architecture confirms its enhanced regenerative properties and its potential for extending 40 Gb/s optical transparent network dimensions by means of cascaded 2R AOWC stages.

In this paper, we address the experimental implementation of an all-optical packet routing scheme, with contention resolution capability, using interconnected semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer (SOA-MZI) structures. Cross talk stemming from the blocked packets, due to the nonideal switching performed by the SOA-MZIs, is analyzed in every stage of the routing configuration. The routing functions and states performance are evaluated through bit-error ratio measurements and extinction ratio analysis. © 2014 Optical Society of America. published

International audience; This study provides a review of all-optical flip-flops (AOFFs) technologies, and their possible experimentalimplementation solutions, for a variety of applications in optical communication networks. A description of the state-of-theartexperimental implementations and validation testing of the technologies used in different AOFFs schemes is made,presenting to the interested reader an overview of the up to date AOFFs design schemes. Some of the research resultspresented in this study were performed under the EU NoE EURO-FOS project consortium. This study also providesresearchers working on this topic with interesting trends that are worth considering in their own research studies.

A generic scheme for return-to-zero (RZ) to nonreturn-to-zero (NRZ) format conversion of optical signals is analyzed. It relies on a simple delay interferometer with frequency periodicity twice as high as the input symbol rate and a subsequent optical band-pass filter. Simulation results at 40 Gbaud indicate the compatibility of the technique with a variety of advanced modulation formats. RZ-to-NRZ conversion of 40 Gb/s differential phase shift keying signals is experimentally demonstrated with 1.5 dB power penalty compared to the back-to-back measurement.

An access architecture for optical intra-network transmission between different users is presented. We demonstrate a cognitive wavelength routing scheme and investigate its scalability.

An aggregation scheme based on a D(Q)PSK/ASK comb transmission in the feeder is presented. A shared delay interferometer allows simple ONUs that are assisted by a ring resonator.

We investigate through numerical studies and experiments the performance of a large scale, silica-on-silicon photonic integrated circuit for multi-format regeneration and wavelength-conversion. The circuit encompasses a monolithically integrated array of four SOAs inside two parallel Mach-Zehnder structures, four delay interferometers and a large number of silica waveguides and couplers. Exploiting phase-incoherent techniques, the circuit is capable of processing OOK signals at variable bit rates, DPSK signals at 22 or 44 Gb/s and DQPSK signals at 44 Gbaud. Simulation studies reveal the wavelength-conversion potential of the circuit with enhanced regenerative capabilities for OOK and DPSK modulation formats and acceptable quality degradation for DQPSK format. Regeneration of 22 Gb/s OOK signals with amplified spontaneous emission (ASE) noise and DPSK data signals degraded with amplitude, phase and ASE noise is experimentally validated demonstrating a power penalty improvement up to 1.5 dB.

The ICT-APACHE research project is focusing on the development of cost-effective, compact, scalable and agile integrated components capable of generating, regenerating and receiving multi-level encoded data signals for high capacity (>100 Gb/s) WDM optical networks. APACHE technology relies on InP active, monolithic chips, hybridly integrated on silica-on-silicon planar lightwave platforms in order to achieve cost-efficiency, high yield, low power consumption and device scaling beyond the level commercially available today. The APACHE integration approach is implemented in a two-dimensional plan, horizontally and vertically, in order to enable multi-functionality and increased capacity, respectively. The final goal of the APACHE project is the fabrication of integrated arrays of transmitters, receivers and regenerators that will operate with 100 Gb/s OOK, DPSK and DQPSK modulated signals, allowing for 1 Terabit/s on-chip capacity. In this paper, we will review the latest results from the system-level characterization of the developed components and will outline the roadmap for future endeavours.

A ring+tree architecture for optical intranetwork data transmission between different users is presented. The nodes at the ring contain a packet envelope detection to extract a wavelength-dependent control signal for a semiconductor optical amplifier-based Mach-Zehnder interferometer (SOA-MZI) switch. The scalability of the architecture and the feasibility for field deployment are discussed. A tree split of 1:1000 has been found to be compatible with data transmission over 50 hops.

Simultaneous dual-channel OOK and DPSK regeneration at 21.328Gb/s using a single monolithic quad-SOA array hybridly integrated on a silica-on-silicon PLC is demonstrated. The transmission performance of the regenerated signals was evaluated up to 950 km.

“Copyright © [2010] IEEE. Reprinted from International Computer Engineering Conference ICENCO’2010. ISBN: 978-1-61284-184-7 This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.” We experimentally demonstrate the accuracy of an all-optical S-R latch and an optical S-R flip-flop based on hybrid integrated Mach-Zehnder Interferometers, with Semiconductor Optical Amplifier in each arm (MZI-SOA). The performance of both bistable devices will be studied and compared in terms of extinction ratio and switching times.

We investigate the performance of a large-scale, silica-on-silicon photonic integrated circuit for multiformat signal processing, and we experimentally demonstrate wavelength-conversion of (differential) quadrature phase-shift keying [(D)QPSK] signals. The circuit exploits phase-incoherent techniques to decode the input signal and to phase remodulate two phase-shift-keying components before combining them in a common QPSK output stream. Error-free wavelength conversion with 4-dB power penalty is reported at 44 Gb/s.

An all-optical clocked set-reset flip-flop is experimentally demonstrated. It is based on a hybrid-integrated S-R latch and two additional Mach-Zehnder interferometer structures with semiconductor optical amplifiers acting as AND logic gates. The switching behaviour of the synchronous S-R flip-flop was investigated and 18 dB extinction ratio performance was achieved.

We analyze the experimental demonstration of a phase-incoherent regeneration scheme for differential phase-shift keying signals at 40 Gb/s. The scheme is based on decoding of the input signal by a 1-bit delay interferometer and subsequent optical remodulation using a fiber-Sagnac interferometer. Power penalty improvement up to 3 dB is reported for phase, amplitude, and amplified spontaneous emission noise loaded signals. Simulation results are in agreement with the experimental findings, and reveal the capability of extending the method at ultrahigh data rates.

The feasibility of transmitting 0.87 Tbit/s dual polarization D8PSK-OTDM over 110 km is, for the first time, demonstrated along with 0.44 Tbit/s single polarization D8PSK-OTDM over 220 km in conventional 55-km span SMF+DCF link.

We present all‐optical regeneration at 40 Gb/s for On‐Off Keying (OOK) and Differential Phase‐Shift Keying (DPSK) signals using a multi‐functional Semiconductor Optical Amplifier (SOA) based Mach‐Zehnder Interferometer (MZI). Error free operation for both circuits was achieved indicating that this device can be used effectively as a regenerator for both OOK and DPSK modulation formats.

We present a new sheme for 40 Gb/s all-optical contention resolution based on cascaded wavelength converters and a hybrid integrated optical flip-flop. Using simultaneously both ports of the flip-flop, component and power reduction is achieved.

We demonstrate a large-scale silica-on-silicon photonic integrated circuit with 4 hybridly integrated SOAs for multi-format regeneration and wavelength conversion. Power penalty improvement up to 1.5dB is reported for degraded OOK and PSK signals.

We report on the transmission performance of a 10×10Gb/s low-cost photonic integrated transceiver comprising a reflective SOA-based laser array and a reflective EAM array over 825km under mixed 10G/40G traffic conditions at 50GHz grid.

We present a new NRZ wavelength conversion scheme based on SOA-MZI. Experimental verification of its superior 2R regenerative capabilities are demonstrated for 40 Gb/s NRZ data signals.

We present a new forwarding-gate scheme using a single SOA-MZI. We show a bi-stable behavior with a 13.6 dB extinction-ratio and rise and fall times below 30ps. Error-free operation is achieved at 40 Gb/s.