Coherent multicarrier lightwave technology for flexible capacity networks (invited)

Highly flexible and survivable networks can be built by allocating optical carriers of heterodyne systems. The basic features of heterodyne systems are reviewed, especially the use of multicarriers, tunability, and selectivity. Then specific application areas that may benefit from flexible multicarrier allocation schemes are discussed. Examples are taken from the RACE Phase II project R2065, coherent optical systems implemented for business traffic routing and access (COBRA). Next, trends and progress in heterodyne systems in general and related key components are summarized, and then examples of ongoing field trials in Europe are discussed. Finally, the coherent multicarrier technology are compared briefly with direct detection multiwavelength technolog

Coherent multicarrier lightwave technology for flexible capacity networks (invited)

Highly flexible and survivable networks can be built by allocating optical carriers of heterodyne systems. The basic features of heterodyne systems are reviewed, especially the use of multicarriers, tunability, and selectivity. Then specific application areas that may benefit from flexible multicarrier allocation schemes are discussed. Examples are taken from the RACE Phase II project R2065, coherent optical systems implemented for business traffic routing and access (COBRA). Next, trends and progress in heterodyne systems in general and related key components are summarized, and then examples of ongoing field trials in Europe are discussed. Finally, the coherent multicarrier technology are compared briefly with direct detection multiwavelength technolog

Multipulse excitability in a semiconductor laser with optical injection

A deterministic mechanism for multipulse excitability that appears to be experimentally accessible in a real laser is presented. Codimension-two homoclinic Belyakov bifurcations and an ensuing cascade of n-homoclinic bifurcation tongues are described as responsible for this phenomenon

Trends in electro-optical communication systems

This paper gives an overview of present status and future trends in Electro-optical communication systems and networks. Within the architecture of Electro-optical communication networks, three areas with a different type of research focus can be distinguished: the long haul links, the crossconnects and the access networks to the subscribers

An initialisation protocol for a CDMA based communications scheme for HFC CATV networks

An initialization protocol for a CDMA based communications system for hybrid fiber coax (HFC) central antenna television (CATV) networks is described. HFC CATV networks are shared medium access networks, employing the coaxial bus principle between an optical network terminator and the subscriber. To realize access in the upstream direction, a multiple access scheme based on CDMA can be used. However, before access is granted in the upstream direction, each cable modem connected to the coaxial bus needs to undergo a startup procedure at activation of the modem to determine timing and physical layer related settings. The initialization mechanism described performs time synchronization of a modem and the determination of the power the modem should use. Next to these physical layer settings, also the identity of a modem is determined during the initialization proces

Integrated-optic versus micro-optic devices for fiber-optic telecom systems : a comparison

We assess the relative merits and prospects of integrated-optics in comparison with microoptic and fiber-based techniques. Firstly, the market for fiber-optic components for telecommunications is analyzed. Secondly, the technological issues which make integrated optics quite different from integrated electronics will be discussed. Thirdly, a specific comparison between the potential of the competing optical technologies will be made for the polarization-diversity hybrid and the optical wavelength (de)multiplexer, two optical devices used in networks that are based on optical frequency division multiplexing (OFDM

Fiber array-to-photonic-chip fixation and fine tuning using laser support adjustment

A concept for coupling lensed fiber arrays to photonic optical chips in the submicrometer range by using metal deformation is presented. Fine-tuning is possible despite already secured positions between the parts due to precisely chosen step-by-step deformations in the constructions. The smallest fine-tuning step of 0.1 um is measured using laser support adjustment. The system is packaged and can be temperature controlled. At a constant chip temperature of 22 degrees C, the package is successfully tested at an ambient temperature range of 0 to 60 degrees C

Study on the limits of all-optical time domain demultiplexing using cross absorption modulation in an electroabsorption modulator

A theoretical and experimental assessment of the performance of an all-ticaldemultiplexer based on cross-absorption modulation in an electroabsorption modulator is presented. Simulations are described for demultiplexing from 160 Gbit/s to a 40 or 10 Gbit/s base rate. Experimental results are presented for demultiplexing to a base rate of 10 Gbit/s from an optical time-domain multiplexing rate of 80 with a bit error rate (BER) ,1029 and 160 Gbit/s with a BER ’1027