Hacene Chaouch

Trials of a Coherent UDWDM PON Over Field-Deployed Fiber: Real-Time LTE Backhauling, Legacy and 100G Coexistence

Transmission capabilities of a coherent real-time UDWDM PON over deployed fibers in two testbeds (Berlin and Darmstadt, Germany) are demonstrated. Extensive coexistence tests including LTE backhauling and GPON, RF-Video, 100G and OTDR were performed. A silicon photonics-integrated CMOS laser was used for parts of the trial.

Dual output SOA based amplifier for PON extenders

A novel two-output PON amplifier is demonstrated to provide over 8-dB output power budget improvement over a conventional SOA, with negligible ASE noise. With an additional preamplifier it can accommodate up to 30 dB burst-to-burst power variation.

High power, narrow linewidth, low noise, integrated CMOS tunable laser for long haul coherent applications

An integrated-CMOS-tunable-laser with 15-dBm output power is presented. Fabrication is realized in commercial CMOS foundry. Laser shows high power, low RIN, and ultra-narrow linewidth. Performance over fiber is comparable with best-in-class, market-leading ITLA, proving suitability for long haul coherent applications.

Field trials of a coherent UDWDM PON: Real-time LTE backhauling, legacy and 100G coexistence

Transmission capabilities of a coherent UDWDM PON over deployed fiber are demonstrated, including LTE backhauling and GPON, RF-Video, 100G and OTDR coexistence. A Silicon Photonics integrated CMOS laser was used for parts of the trial.

Simulation and optimization of 100 Gbit/s single channel modulation formats

The performance of various modulation schemes for 100 Gbit/s single channel serial transmission is investigated by means of numerical simulations. Different ASK and PSK modulation formats are compared in terms of total system reach for a 10-9 BER requirement. RZ-DQPSK format with a 1,920 km reach, without FEC and the support of additional Raman amplification, outperforms all the other schemes including 10×10 Gbit/s NRZ DWDM inverse multiplexing.

Photonic balancing and its application in optical receivers and regenerators for fiber-optic systems

We present an optical receiver for RZ-DPSK signals that use photonic balancing. Photonic balancing is achieved through pulse counter-propagation and collision in a saturated SOA. We explain the principles of photonic balancing and show how it can lead to an improvement in RZ-DPSK detection by 3 dB, similar to electrical balancing. We also show how this scheme can be used as a Mamyshev-type regenerator.

Serial 100 Gbit/s PM-RZ-DQPSK transmission in the presence of perturbations from lower data rate neighboring channels

This paper investigates serial 100 Gbit/s PM-RZ-DQPSK transmission in the presence of perturbations from neighboring 10 Gbit/s NRZ, 40 Gbit/s RZ-DPSK, and 40 Gbit/s RZ-DQPSK DWDM channels. It addresses the need to outline upgrade paths of current hybrid DWDM systems equipped with 10 and 40 Gbit/s line cards towards 100 Gbit/s for remaining channels. A numerical simulation approach is used to evaluate the signal quality of the central probe for various DWDM channel constellations and power levels.

SOA-based Mamyshev-type regeneration: towards an all-optical error correction?

Self-phase modulation in a highly nonlinear fiber (HNLF) had been demonstrated to have regeneration capabilities when associated with shifted filtering. In this paper, we show how a saturated semiconductor optical amplifier (SOA) can enhance this concept by optimally transferring the signal power to the shifted-filters side of the spectrum. We also provide a detailed optimization analysis of the filters detuning and bandwidth by means of numerical simulations. In this study, we consider an amplitude and phase noise degraded return to zero differential binary phase shift keyed signal (RZ-DBPSK).

Q‐Factor Improvement of Phase Noise Degraded DPSK Signals Using Asymmetric Saturated Regeneration

We demonstrate a 6.3 dB improvement in Q‐factor for RZ‐DPSK signals using a shifted filter after a highly saturated SOA working in a contra‐propagating colliding pulse scheme. We show first, both theoretically and by means of simulations, how the phase noise is transformed after demodulation. Then, we demonstrate experimentally, for the first time, that this configuration induces a spectral asymmetry in addition to self phase modulation that if associated with a shifted filter, removes significantly the noise present in both the demodulated marks and spaces. The Asymmetric Saturated Regeneration (ASR) is an enhanced version of the fiber based Mamyshev regenerator.