B. Huiszoon

Evaluation of effects of MZM nonlinearity on QAM and OFDM signals in RoF transmitter

We present, both numerically and experimentally, the nonlinearity effect of the intensity modulator in RoF transmitters through the comparison between single-carrier QAM and multi-carrier OFDM signals. The acceptable RF power level of the multi-carrier OFDM signal is 2 dB less compared with the single-carrier signal for the same EVM penalty of 1%, indicating the degradation due to inter-modulation products caused by the modulator nonlinearity for OFDM RoF systems.

Integrated Parallel Spectral OCDMA En/Decoder

In this letter, a passive integrated device is presented that enables cost-effective parallel encoding and decoding in a spectral amplitude encoded optical code-division multiple-access transmission system. The device is monolithically integrated in InP-InGaAsP. Simulation and experimental results are given

Cost-effective up to 40 Gb/s transmission performance of 1310 nm directly Modulated lasers for short- to medium-range distances

This paper presents successful 20 and 40 Gb/s potentially low-cost transmission experiments using 1310 nm directly modulated distributed feedback lasers (DMLs) in the very-short- to medium-range distances. This paper will recommend operating conditions for error-free transmission at these bit rates and distances. Pattern dependencies are identified. General characteristics of direct laser modulation are confirmed by dedicated simulation software and experiments. Unknown laser parameters needed to solve the rate equations are estimated by a given method based on measured and calculated small- and large-signal DML responses.

Improving Energy Efficiency in IEEE 802.3ba High-Rate Ethernet Optical Links

Energy efficiency in communications, and particularly Ethernet, is becoming an important research area. The IEEE 802.3az energy-efficient Ethernet standard has already proposed a mechanism to reduce energy consumption on copper-based physical layer devices. This mechanism exploits the well-known fact that end-user links are usually lightly loaded, and that important energy savings can be achieved, if the device is put into a low-power sleep-mode whenever no frames are pending for transmission. This study pursues a two-goal purpose: firstly, it aims to evaluate whether such an active/sleep dual-state mode is suitable for high-rate optical Ethernet links as defined in the upcoming IEEE 802.3ba amendment that specifies the lower layers of 40- and 100-Gigabit Ethernet. Secondly it proposes to use an algorithm that dynamically exploits the multilane architecture of the high-speed optical transport layer. As it is studied throughout the paper, the two-state active/sleep-based mechanism may not achieve energy savings, while a load-based dynamic lane management enables energy reductions for a wide range of input traffic loads. A commercially available 100GBASE-SR10 module is used as case study for the analysis.

Plastic-optical-fiber-based in-home optical networks

Large-core polymethylmethacrylate (PMMA) plastic optical fiber has been recognized as a strong candidate for future in-home networks. Both economic and technical studies have shown that it can provide a cost-effective solution to address the booming capacity demand. Evolving from laboratory to trial systems with emerging and maturing POF components, Gigabit POF solutions are getting ready to be commercialized. This article overviews the state of the art of POF activities in both research and industrial aspects, and reports the latest achievements.

Orthogonal En/Decoders for Truly Asynchronous Spectral Amplitude Encoded OCDMA

In this paper, theoretical results are presented on the modular construction of orthogonal tree and cascade encoders/decoders of any size for truly asynchronous and cost-efficient spectral amplitude encoded OCDMA on a passive optical network. Three modular building blocks are proposed and described in detail. The tree structure is introduced that enables parallel code processing with a single device. The orthogonality of the code set is evaluated whereafter a revised construction method is proposed. Analysis and simulation confirm that a tree constructed via this method is orthogonal.

Hybrid Radio-Over-Fiber and OCDMA Architecture for Fiber to the Personal Area Network

The future communication needs of network subscribers demand a broadband optical access tier that supports user mobility in a heterogeneous landscape of wireless networks. A hybrid architecture is proposed in this paper where high-frequency wireless data communication is enabled via a combination of optical code and radio-over-fiber techniques. The feasibility is confirmed by simulations in case of two spectrally-efficient modulation formats at a 1-Gb/s throughput.

Layer 2 and 3 Contention Resolution and Radio-Over-Fiber in OCDMA PON for Transparent Optical Access in Personal Networks

In this paper, we analyze, for the first time, the eminent role of optical transparent networking in personal networks. We show how an optical access network mitigates many issues with respect to connectivity and mobility management. A concrete personal network user-scenario deduces requirements for such an architecture. A combination of passive optical network, optical code-division multiple access (OCDMA), and radio-over-fiber exhibits minimal cost and complexity because of centralized network control and management, resource sharing, and simplified network nodes. We enable transparent peer-to-peer communication between optical networking units in the OCDMA passive optical network subnet of the central office. We use, for the first time, simultaneously optical code-sense medium access control and optical code packet switching for contention resolution.

Integrated Mach–Zehnder-Based Spectral Amplitude OCDMA on a Passive Optical Network

In this paper, we present our results on Mach-Zehnder-based spectral amplitude encoded optical code-division multiple access (OCDMA) in a passive optical network using a novel parallel spectral encoder/decoder. The modular construction of orthogonal code processors is shown along with operational settings. Simulation results are shown for an eight-user network scenario. The monolithic integration of a parallel encoder in an InP/InGaAsP material system is discussed whereafter static measurement results are given. Finally, several options are discussed to increase network flexibility and optical transparency.

On the Upgrade of an Optical Code Division PON with a Code-Sense Ethernet MAC Protocol

We propose, for the first time, optical code-sense multiple access / collision detection to upgrade an optical code division passive optical network with minor modifications to transparently deploy Ethernet (or packet) based services.