ummer is the time many vaca-tioners head to Europe, butgoing abroad is all business forRSoft Design Group. In June,
RSoft made two significant announce-ments regarding their expansionoverseas. First, the companyannounced a distribution and R&Drelationship with AlpsTelecommunications Software (ATS).Then, just weeks later, RSoft openedits newest office, RSoft DesignEurope, in the UK.
ATS is a start-up company found-ed via the I3P Incubator at thePolitecnico di Torino, Italy. The com-pany is distributing RSoft's system-level tools including OptSim andLinkSIM and its network-level tool,Artifex, across the European Union (withthe exception of France). RSoft will con-tinue to directly sell MetroWANDboth domestically and abroad. RSoftproduct distribution in France will con-tinue to be handled by OPTOPRIM.RSoft and ATS also entered into a con-sulting relationship where ATS will col-laborate on research and developmentwith RSoft on RSoft's system-level tools.These agreements will significantlyenhance RSoft's sales channels in Europeand allow for the continued develop-ment of its system tools to better servecurrent and future RSoft customers.
Dr. Vittorio Curri, CEO of ATS, notes, "Thedistribution agreement we have signedis a great opportunity for both RSoft
Design Group and ATS. RSoft will be ableto take advantage of the well-knowntechnical skill of ATS' people, as well asto their experience in the market seg-ment. ATS will benefit by being a part-
ner of a company with deep market pen-etration and well-funded future plans.The ATS team, including myself, is real-ly delighted that the distribution agree-ment has been added to the collabo-ration contract already in place betweenATS and RSoft."
Back in England, RSoft Design Europehas been set up to sell RSoft's compo-nent design tools includingB e a m P R O P , F u l l W AV E ,BandSOLVE, GratingMOD, andLaserMOD in the EU. The newoffice will also allow RSoft to providetechnical support directly to the Europeancommunity, while further strengthen-ing RSoft's presence abroad.
John Horgan has been appointed gen-eral manager of RSoft Design Europe.
John has more than 18 years of expe-rience in sales, marketing, and techni-cal support in the electro-optics andphotonics industries. Most recently,John was the telecom products manager
at Optima Research Ltd., RSoft'sformer European distributor, wherehe dealt almost exclusively withRSoft's component design tools.(For more information, see "MeetJohn Horgan" on page 4.)
The new European office, as wellas the two ATS agreements, pro-vide the base by which future busi-ness can be grown throughout theEuropean Union, reinforcing RSoftDesign Group's position as the
market leader in the design, simulation, and optimization fields.
N F O E C , B o o t h 8 0 9 E C O C , B o o t h 6 9 4 L E O S , B o o t h 3 3 S e p t e m b e r 2 0 0 3
Volume 2 Number 2
RSoft Design Group Heads To EuropeNew European Office And Partnership With ATS Increases RSoft's Presence Overseas
FullWAVE Version 3.0 Steps Up ToThe Challenge Of Photonic DevicesComplex Design Requirements
Meeting The Need For Speed:BandSOLVE Upgrade AcceleratesPhotonic Band Structure Calculations
RSoft Opens Its First EuropeanOffice: Meet John Horgan
GratingMOD Is Embraced ByGovernment, Universities, AndPrivate Industry
Breaking Down The Wall BetweenSimulation Of Electrical And OpticalDomains
Availability Analysis Is The Key ToReducing Network Operating Costs
hotonics engineers have increasinglycomplex design needs, especially in rap-idly developing areas of photonic crystal-related research and applications, as well
as in new areas where the FDTD method can be fea-sibly applied, such as micro-diffractive devices, sur-face plasmons, biophotonics, and VCSEL cavity design.The latest version of FullWAVE steps up to these designchallenges. Version 3.0 adds new functionality forboth 2D and 3D modeling which simplifies data meas-urement and post-processing, includes extended mate-rial models for anisotropic and metallic materials, andadds additional excitation types.
A FullWAVE FDTD simulationproduces large amounts of data,and it is important to providea convenient and sophisticatedinterface to extract useful data.FullWAVE utilizes time moni-tors which make measure-ments as a function of timeduring a simulation for thispurpose. This concept has beenexpanded in the latest version,so users now have access to allthe data produced by the FDTDalgorithm. Measurements cannow be made of specific fieldcomponents, allowing for almostlimitless post-processing options. In addition to the fielddata, several common electromagnetic parameterssuch as power, the Poynting vector, and energy den-sities in both the spatial and temporal domain can berecorded. Additionally, the frequency analysis optionshave been expanded to include both FFT and DFTanalysis. This provides users with added functionalityand allows for spectrum analysis at arbitrary frequen-cies.
Version 3.0 introduces support for anisotropic mate-rials. The refractive index of materials can now bedefined by an arbitrary index tensor, which allows forthe design and simulation of structures that dependon birefringent effects. Support for dispersive materi-als has also been improved. The Drude and Lorentz dis-persion models are now implemented, and allow forimproved simulation of metallic structures.
FullWAVE Version 3.0 also includes support for multi-ple launch fields with different spatial and temporal char-acteristics. This includes parameters such as position,wavelength, direction, polarization, and temporal exci-tation. Additionally, linear, circular, and arbitrary polar-
izations are now available. Thisallows for improved simulationof real-world excitation types.
While FullWAVE can be used asa stand-alone solution, it canalso be easily integrated withother RSoft device design toolssuch as BeamPROP,G r a t i n g M O D a n dBandSOLVE because of theshared RSoft CAD-layout inter-face that allows hybrid simulationon complicated photonicdevices.
As the only commercial photonic FDTD tool with a par-allel computing feature, FullWAVE's clustering capa-bility has been significantly improved in terms of sim-ulation capability, display, and post-processing. Theseadvancements make FullWAVE the only feasible sim-ulator for large-scale 2D and 3D modeling. Additionalperformance improvements in this new version makeFullWAVE the fastest, most memory-efficient tool onthe market.
FullWAVE Version 3.0 Steps Up To The ChallengeOf Photonic Devices' Complex Design Requirements
Figure 1. FullWAVE simulation results of a photonic band gap-based channel-dropping filter.
he latest versionof RSoft DesignGroups photonicband structure
tool, BandSOLVE, introduces twonew simulation modes providinggreater speed in calculation.BandSOLVE 1.2, released August,2003, now supports both inversionsymmetry and mode-seeding.
Most useful photonic crystalstructures display inversionsymmetry if all spaceis inverted, the refrac-tive index distribu-tion is unchanged.For example, inmany 2Dstructures,thetransfor-mation x -x, y-y produces an identi-cal structure. This seemingly sim-ple symmetry has a direct impact onthe eigenmodes of the photoniccrystal, in that their expansion in planewaves is real, instead of complex.New code that takes advantage ofthis difference can now produceidentical results in as little as 45percent of the time previouslyrequired. For large 3D problems,this timesavings is a huge advantageto the user. BandSOLVE 1.2 supportsinversion symmetry in one, two, orthree dimensions and activation ofthe feature requires only a singleswitch.
Similar or even better time effi-ciencies are realizable using theother new addition to BandSOLVE1.2: mode-reseeding. In band struc-ture work, engineers are invariablyrequired to solve numerous similarproblems. For instance, in con-structing a single band structure, aneigenvalue problem is solved formany wave vectors within theBrillouin zone. If the various wave
vectors are closely spaced, themodal solutions
are verysimilar in form.Therefore, the results atone wave vector often representa good first guess, or seed, for thesolutions at the next wave vector.Reseeding is remarkably effective,providing typical speed-ups of bet-ter than 100 percent. Moreover,the closer the scan in wave vector,the greater the improvement. High-resolution scans actually finish fasterthan low resolution scans! As usualin BandSOLVE, all the work is done
for the user mode seeding isactivated with a single mouse click.
BandSOLVE 1.2 includes numerousother enhancements, including newmeasurements of polarization frac-tions and the McIsaac mode classfor photonic crystal fibers, and facil-ities for more flexible organizationof measurements. Considerableattention has been made to improv-ing BandSOLVEs unique dual-modeinterface to the FDTD engine for cal-culating metallic and dispersive
band structures. Finally, an enhanced
browsing and new options forexporting graphs and mode profilesin a variety of image and animationformats.
BandSOLVE 1.2 is being demon-strated at the RSoft booth stopby to see these latest enhance-ments firsthand.
Meeting The Need For Speed:BandSOLVE 1.2 Accelerates Photonic Band Structure Calculations
Defect mode for the
photonic crystal slab with
line defect shown in crystal
lattice. The simulation speed of
large 3D problems such as this
one benefit from BandSOLVE
1.2's support of inversion sym-