C. Melange

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.

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.

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 symmetric 320Gb/s capable, 100km extended reach hybrid DWDM-TDMA PON

We demonstrate a DWDM-TDMA PON with symmetric 320 Gb/s capacity shared between 16384 customers. The upstream channels were tested in burst-mode and feature low-cost tuneable lasers, monolithically integrated SOA-EAMs, burst-mode EDFAs and a 10 Gb/s burst-mode receiver.

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.

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

Burst-Mode CDR Performance in Long-Reach High-Split Passive Optical Networks

This paper compares two burst-mode clock and data recovery (BM-CDR) techniques suitable for bursty upstream data transmission, namely a gated voltage controlled oscillator (GVCO) and an oversampling clock phase alignment (CPA). Numeric models were deduced with timing jitter and duty cycle distortion (DCD) present in the received data. The performance of the two techniques are analyzed and compared especially in an optically amplified long-reach high-split PON (LR-PON) system. It is shown that an oversampling CPA exhibits a large DCD tolerance and better jitter rejection than a GVCO without line coding, resulting in high network efficiency while keeping fast bit synchronisation. This makes the oversampling CPA technique the best option for the proposed network.

A 1024-QAM Analog Front-End for Broadband Powerline Communication Up to 60 MHz

A high performance analog front-end (AFE) for broadband powerline communication between 1.6 and 60 MHz is presented. The frequency division multiplexing AFE supports optimum channel selection, avoids disturbing RF signals and allows co-existence with other users of the spectrum. The direct-conversion receiver operates linearly up to a + 18 dBm input level. Tunable low-pass filters, integrated into the receive path, support a wide class of service requirements by channel bandwidth selection. The dynamic range is 99.5 dB for 2 MHz channels, and 90.5 dB for 16 MHz channels. Error vector magnitude measurements are presented for a single-carrier 1024-QAM and a 1024-carrier 64-QAM signal as function of frequency and channel attenuation. For 1024-QAM, the error vector magnitude (EVM) is below or equal to 1.2% rms up to 60 dB of attenuation, whereas the 1024-carrier 64-QAM performs well up to 80 dB of attenuation. The presented chip was fabricated in a 0.25 mum SiGe BiCMOS process, and the measured power consumption from a single 2.5 V supply is 668 mW.

Analog Front-End ASIC Requirements for a FDM Broadband Powerline System Enabling Co-Existence

This paper presents a feasible set of analog ASIC requirements optimized to achieve co-existence in a broadband power line communications (PLC) system based on frequency division multiplexing (FDM). FDM is the most straightforward way to achieve co-existence between different systems, however, this involves many design challenges at the circuit level. First, a short description will be given of the PLC system, which is under development in the EU funded IST POWERNET project. It will be shown that conventional receiver architectures, typically designed for time division multiple access (TDMA) schemes, are not well suited for FDM systems e.g. due to challenges arising from near/far situations. Solutions to improve the performance will be discussed and simulation results will be presented of the proposed architecture, based on parameters extracted from circuit designs, to show the feasibility of high bit rates in FDM transceivers.

Burst-Mode Electronic Equalization for 10-Gb/s Passive Optical Networks

Using computer simulations, it is shown how burst-mode electronic equalization in the optical line termination of a passive optical network (PON) allows 10 Gb/s in the upstream direction with directly modulated distributed-feedback lasers. This allows achieving 10 Gb/s using cost-effective components at the optical network unit. Fast convergence of the equalizer coefficients is achieved during the preamble of each burst using the recursive least squares algorithm instead of the least mean squares algorithm. With a nine-tap feed-forward equalizer, two-tap decision feedback equalizer, a physical reach of 38 km and a splitting factor of 32 can be achieved in the 1.5-mum window, exceeding requirements for deployed PONs.