Bart Baekelandt

A Novel Technique for Low-Cost Embedded Non-intrusive Fiber Monitoring of P2MP Optical Access Networks

A low cost embedded OTDR method is presented for monitoring the fiber plant of TDM optical networks without extra optical components nor performance penalty. It localizes abrupt changes in link attenuation without disturbing network operation.

Integral equation modeling of the scattering and absorption of multilayered doubly-periodic lossy structures

Previously, the scattering and absorption of a doubly-periodic array of pyramidal absorbers were analyzed using a surface integral equation (SIE) approach. This method is now extended to multilayered absorbers with arbitrarily shaped surfaces between the layers. The developed method is verified on planar stratified absorbers, on wedge absorbers, and rectangular absorbers showing the capability of the method to handle such structures as well. It is also shown that convergence depends critically on the discretization of the equivalent electric and magnetic current. >

OSNR Penalty Imposed by Linear In-Band Crosstalk Caused by Interburst Residual Power in Multipoint-To-Point Networks

We present an analysis of linear in-band crosstalk in high split long reach wavelength/time-division-multiplexing passive optical networks (WDM-TDM PONs). In this letter, a mathematical model is deducted for the first time to calculate optical signal-to-noise ratio penalties due to in-band crosstalk in multipoint-to-point networks. The network performance can be perturbed by in-band crosstalk caused by power leakages from burst-mode optical network units (ONUs) in off-state. Our study results show that the leaked powers in upstream ONU transmitters can have an impact on the achievable split factor of WDM-TDM PONs. Furthermore, the performance limitations caused by aggregated interburst residual power are discussed.

The FE-BIE technique applied to some 2-D problems relevant to electromagnetic compatibility: optimal choice of mechanisms to take into account periodicity

A study of mechanisms to account for periodicity when modeling two-dimensional (2-D) structures with a hybrid finite-element boundary integral equation (FE-BIE) method is presented. These techniques are either based on the use of Greens functions or on the application of the Floquet-Bloch theorem as a periodic boundary condition. The described formalism can be used to model very diverse problem geometries as is demonstrated by means of some typical examples. For these configurations, it is shown how an optimal choice can be made between the mechanisms that impose periodicity.

Fully DC-coupled 10Gb/s burst-mode PON prototypes and upstream experiments with 58ns overhead

This paper presents a chain of four fully DC-coupled 10Gb/s burst-mode prototypes operating with 58ns overhead for the first time. 10Gb/s upstream burst-mode experiments are performed without a time-critical reset signal from test equipment.

Next generation access networks: PIEMAN and beyond

Long-reach access networks such as the hybrid TDM-WDM-PON studied in the EU-funded project PIEMAN reduce node count and increase bandwidth per customer, but require challenging opto-electronic component development. We review PIEMANs achievements and future possibilities.

A 10 Gb/s burst-mode receiver with automatic reset generation and burst detection for extended reach PONs

We present a 10 Gb/s burst-mode receiver featuring automatic reset generation. The measured sensitivity is -12.5 dBm at a loud/soft ratio of 11.5 dB with a guard time of 25.6 ns and a short preamble of 23.8 ns.

A 2.7V 9.8Gb/s Burst-Mode TIA with Fast Automatic Gain Locking and Coarse Threshold Extraction

Todays broadband access is moving towards PONs at 10Gb/s. This requires a burst-mode receiver to support the TDMA protocol used in its upstream path. Such a receiver consists of a burst-mode transimpedance amplifier (BM-TIA) which largely dictates the performance of the receiver and a burst-mode post-amplifier (BM-PA) that removes all dc-offsets present in the BM-TIA signal and regenerates the logical amplitude information. The BM-TIA is fabricated in a 0.25mum SiGe BiCMOS technology. The TIA is mounted together with a PIN photodiode in a butterfly package. These measurements show that the gain locking happens within 4.5ns from the start of the burst.

Full-duplex 10 Gb/s transmission in ultra-dense PONs with tree splits >1:1k and noise-powered extender box

Splits >1000 are shown to be feasible for PONs by inserting an intermediate amplifier that is pumped by the ASE of SOA-based ONUs. Full-duplex 10Gb/s burst-mode transmission is demonstrated over a 39.5dB loss budget.

High Performance Burst-Mode Upstream Transmission for Next Generation PONs

This paper presents the effective optical gain achieved with FEC in 1.25 Gbit/s GPON uplink yielding -36 dBm burst-mode receiver sensitivity and 25 dB dynamic range. A low cost embedded fiber monitoring system measures fiber attenuation and locates deteriorations without interference with TDM(A) network operation or power budget penalty. Finally, a 10 Gbit/s WDM/TDMA long reach PON system is introduced