K. Ennser

Efficient Erbium-doped waveguide amplifier insensitive to power fluctuations

We describe an efficient erbium-doped waveguide amplifier insensitive to output power variation by means of optical gain clamping. Output power suitable for metro applications and gain flatness over full C-band are demonstrated. We also show that this technology is suitable for transparent WDM ring network. In fact the possible recirculation of amplified spontaneous emission noise or laser power leaking from mirrors will not impact the device performance making robust to transients for next generation reconfigurable WDM ring networks.

Dynamic behavior of gain-clamped Er:Yb and high concentration Er-doped amplifier

All-optical gain-clamped erbium-ytterbium (Er : Yb)-doped amplifier dynamic response is modeled and investigated. The complex Er:Yb rate equation system is reduced to a single equation. This simplification gives a more intuitive understanding of relevant physical mechanisms of Er:Yb doping. Experiments confirm theoretical assumptions. Results also allow us to describe dynamics in highly doped Er devices such as waveguide amplifiers.

Reconfigurable Add/Drop Multiplexer Design to Implement Flexibility in Optical Networks

Reconfigurable optical add-drop multiplexer (ROADM) is a key network element enabling flexible handling of wavelengths. Its architecture allows for remote traffic provisioning at the wavelength level in network node, better utilization of transmission bandwidth, operation cost reduction, simplification of network design and implementation. In this talk we present recent results on the investigation of ROADM architecture, components and technologies. The study considers physical and networking aspects including modeling and simulations for optimization of the switching node

Amplification of Optical Bursts in Gain-Stabilized Erbium-Doped Optical Amplifier

Optical-burst amplification in a gain-stabilized-amplifier may generate complex gain dynamics with chaotic behavior. This phenomenon is thoroughly investigated using a theoretical model and dedicated experiments. Optimized device designs to avoid optical-burst transmission impairments are proposed.

Gain-Stabilized Erbium-Doped Waveguide Amplifier for Burst Transmission

We demonstrate an optical gain-clamped waveguide amplifier robust against wavelength-division-multiplexing (WDM) burst transmission transients even with synchronous arrival of all packets. A maximum power excursion of about 0.3 dB is reported for the worst case under repeated burst arrivals. We show that a very small difference in burst periodicity generates completely different transient dynamics that may also self-impact the modulated channel. The impact of cavity design on amplification performance is reported. Nonlinear behavior is observed near system resonances. We observe burst transmission is a critical application, far more demanding than any use in reconfigurable WDM networks where only abrupt channel add-drop or link failure may occur

High-Gain Erbium-doped Waveguide Amplifier for Bidirectional Operation

We demonstrate a 15-dB gain bidirectional optical-gain-clamped erbium-doped waveguide amplifier immune to transient dynamic impairments. The device is suitable for reconfigurable WDM network.

Erbium-doped waveguide amplifier insensitive to channel transient for reconfigurable high-capacity WDM metro networks

We demonstrate an optical-gain clamped EDWA suitable for application to high-capacity reconfigurable WDM metro-networks. The EDWA is insensitive to channel add/drop or pump fluctuations. We also show no spectral-hole-burning offset, reconfigurable gain and no noise-figure degradation.

Demonstration and Design of Bidirectional WDM Ring-Network using Optical Gain-Clamped Erbium-doped Waveguide Amplifier

We demonstrate a transparent bidirectional ring network using optical gain clamped erbium-doped waveguide amplifier. The network is immune to channel reconfiguration and power transients.

Power transients control in transparent WDM networks

A main concern in a reconfigurable WDM networks is to control the amplifier power transients caused by channel reconfiguration or even network failure/recovery. A simple and low cost solution is to use optical gain clamping (OGC) technique. We present efficient OGC-amplifier configuration with variable gain control insensitive to transients. We show experimental results on a new optical-gain-clamping solution where the whole ring network acts as a laser cavity. We demonstrate that recirculating amplified-spontaneous-emission noise may clamp the network gain. The spectral-hole-burning (SHB) offset limitation is also addressed. In addition we describe a recent transparent network testbed based on OGC-EDWA that outperforms the standard OGC-EDFA and suppresses SHB offset.

Erbium-Doped Waveguide Amplifier Insensitive to Channel Transient and to Spectral-Hole-Burning Offset

We demonstrate an optical-gain clamped Erbium-doped-waveguide-amplifier suitable for application to high-capacity reconfigurable WDM metro-networks. The waveguide amplifier is insensitive to channel add/drop and to spectral-hole-burning offset in large wavelength range suitable for 16-channel WDM systems.