Optical filter design using signal processing techniques

Madsen, C.K.

doi:10.1364/oic.2001.tua1

Cited by 168 publications

(350 citation statements)

References 0 publications

Supporting

Mentioning

347

Contrasting

Unclassified

Order By: Relevance

“…1, consists of two 3 Â 3 fibre couplers, connected in series with a set of delays in between (the middle and lower filter path have one and two unit delays, respectively). By selecting a unit delay of 10 ps, the free spectral range (FSR) of the device is set to approximately 100 GHz [6]. Owing to the non-recursive filter structure this optical filter is equivalent to a digital finite impulse response (FIR) filter of second order.…”

Section: Principle Of Operationmentioning

confidence: 99%

Tunable all-fibre delay line filter for residual dispersion compensation in 40 Gbit/s systems

et al. 2004

View full text Add to dashboard Cite

Duthel, T.; Jansen, S.L.; Otto, M.; Krummrich, P.M.; Schäffer, C.G. Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Tunable all-fibre delay line filter for residual dispersion compensation in 40 Gbit=s systems T. Duthel, S.L. Jansen, M. Otto, P.M. Krummrich and C.G. Schäffer A novel all-fibre tunable delay-line filter, with a simple structure based on two 3 Â 3 fibre couplers and only one phase shifter is utilised for residual dispersion compensation in a 40 Gbit=s optical transmission system. In this experiment the dispersion tolerance of the receiver was successfully enhanced by 100 ps=nm.Introduction: In optical networks with channel bit rates of 40 Gbit=s or higher chromatic dispersion is a severe limiting factor. The main part of the chromatic dispersion is usually compensated by dispersion compensating fibre, however a small amount of dispersion always remains due to, for example, rerouting or temperature variations. This residual dispersion has to be compensated adaptively to guarantee that the dispersion stays within the tolerant range of the receiver. For this purpose several approaches have been introduced. The most common solutions are tunable chirped fibre Bragg gratings [1] and optical delay line structures in planar-and bulk-optics. The capabilities of recursive [2,3] and nonrecursive [4,5] delay line structures have been proven in system experiments. These components suffer from high loss due to fibre coupling and furthermore, planar devices are polarisation sensitive.In this Letter, residual dispersion compe...

show abstract

Section: Principle Of Operationmentioning

confidence: 99%

Tunable all-fibre delay line filter for residual dispersion compensation in 40 Gbit/s systems

et al. 2004

View full text Add to dashboard Cite

show abstract

“…Each delay line may be presented by a transfer matrix of the form (10) where is the differential transmission loss between the two arms and is given by an expression similar to that of (8) for (11) where is the length difference between the two arms of the delay line.…”

Section: B Delay-line Matrixmentioning

confidence: 99%

“…They showed that solutions exist with the same amplitude transfer function but different phase characteristics. Several devices using this principle have been fabricated and their optical performance demonstrated [9]- [11]. However, none of them showed detailed analysis about the selection of the "best" synthesis solution.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a control system for an optical delay-line circuit used as reconfigurable gain equalizer

Schlipf

Street²,

Pandavenes³

et al. 2003

J. Lightwave Technol.

View full text Add to dashboard Cite

Abstract-The design and analysis of a control system for a coherent two-port lattice-form optical delay-line circuit used as reconfigurable gain equalizer is presented. The design of the control system, which is based on a real device model and a least-square optimization method, is described in detail. Analysis on a five-stage device for the 32 possible solutions of phase parameters showed that, for some filter characteristics, the variations in power dissipation can vary up to a factor of 2. Furthermore, the solution selection has influence on the optimization result and number of iterations needed. A sensitivity analysis of the phase parameters showed that the allowable error in the phase parameters should not exceed a standard deviation of 500 in order to achieve a total maximal absolute accuracy error not greater than approximately 0.6 dB. A five-stage device has been fabricated using planar lightwave circuit technology that uses the thermooptic effect. Excellent agreement between simulations and measurements has been achieved.Index Terms-Delay-line circuit, equalizer, gain control, planar lightwave circuit (PLC), thermooptic (TO) effect, tunable optical filter, wavelength-division multiplexing (WDM).

show abstract

“…Borrowing the concept from the field of electronics, optical engineers have used optical delay lines to generate optical filter functions. Depending on whether the transfer function has poles, an optical digital filter can be classified as a finite impulse response (FIR) filter and an infinite impulse response filter [1]- [3]. FIR filters can be designed to have the same amplitude responses but have the opposite phase responses by properly locating the zeros in the transfer functions [1], [3].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on whether the transfer function has poles, an optical digital filter can be classified as a finite impulse response (FIR) filter and an infinite impulse response filter [1]- [3]. FIR filters can be designed to have the same amplitude responses but have the opposite phase responses by properly locating the zeros in the transfer functions [1], [3]. Most optical digital filters include optical delay lines, directional couplers, and phase shifters.…”

Section: Introductionmentioning

confidence: 99%

Dispersion-Compensating Optical Digital Filters for 40-Gb/s Metro Add–Drop Applications

Chen

2004

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

Optical filter design using signal processing techniques

Cited by 168 publications

References 0 publications

Tunable all-fibre delay line filter for residual dispersion compensation in 40 Gbit/s systems

Tunable all-fibre delay line filter for residual dispersion compensation in 40 Gbit/s systems

Design and analysis of a control system for an optical delay-line circuit used as reconfigurable gain equalizer

Dispersion-Compensating Optical Digital Filters for 40-Gb/s Metro Add–Drop Applications

Contact Info

Product

Resources

About