High-performance, free-space ruled concave gratingdemultiplexer

Timofeev, F.N.; Sokolskii, M. N.; Midwinter, J.E.; Bayvel, Polina

doi:10.1049/el:19950968

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…For high performance, custom mirror curvatures may need to be fabricated. The use of a concave diffraction grating [20] could lead to a simplified encoder and decoder geometry, as well as improved dispersion characteristics in the mask plane. Future analysis of the optical system will be performed to determine and minimize these effects.…”

Section: Discussionmentioning

confidence: 99%

Optical spectral amplitude CDMA communication

Nguyen

Dennis

Aazhang

et al. 1997

J. Lightwave Technol.

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We report the first demonstration of bipolar coding techniques in the optical spectral domain for incoherent optical code division multiple access (CDMA) communication. Based on the modulation and detection principles that we have developed, the power spectrum of an erbium-doped superfluorescent fiber source was encoded using bipolar codes and decoded using an optical bipolar correlator. A CDMA testbed consisting of two encoders and one decoder was implemented with bulk optics and free-space transmission. Our measurements verify the correlations between the bipolar codewords and demonstrate the rejection of multiple access interference.Index Terms-Code division multiple access, optical communications, spectral coding.

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Section: Discussionmentioning

confidence: 99%

Optical spectral amplitude CDMA communication

Nguyen

Dennis

Aazhang

et al. 1997

J. Lightwave Technol.

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“…For example, a similar concave grating demultiplexer has been implemented to demultiplex 0.4-nm separated channels spaced around a central wavelength of approximately 1.5 m. 30 This demultiplexer successfully separated signals from a single-mode ͑f͞5͒ optical fiber to multiple single-mode output fibers and achieved a spot size of approximately 20 m, which is near the diffraction limit for an f͞5 system. In this demultiplexer, the output waveguides were separated by 42 m and the cross-talk isolation between adjacent channels was measured at greater than 25 dB.…”

Section: E Diffracted Spot Size and Cross-talk Estimationmentioning

confidence: 99%

“…Losses will be incurred owing to imperfections in the grating, diffraction efficiency losses from the grating, and coupling losses that are due to scattering, waveguide coupling mismatches, and Fresnel losses. A similar grating demultiplexer 30 was observed to have losses ranging from Ϫ6 to Ϫ9 dB for 40 optical channels; so we will assume a loss within the free-space demultiplexer of Ϫ9 dB.…”

Section: B Optical Losses and Power Budgetmentioning

confidence: 99%

All-optical crossbar switch using wavelength division multiplexing and vertical-cavity surface-emitting lasers

Webb

Louri

1999

Appl. Opt.

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A design for an all-optical crossbar network utilizing wavelength-tunable vertical-cavity surface-emitting laser ͑VCSEL͒ technology and a combination of free-space optics and compact optical waveguides is presented. Polymer waveguides route the optical signals from a spatially distributed array of processors to a central free-space optical crossbar, producing a passive, all-optical, fully connected crossbar network directly from processor to processor. The analyzed network could, relatively inexpensively, connect local clusters of tightly integrated processors. In addition, it is also believed that such a network could be extended, with wavelength reuse, to connect much larger numbers of processors in a multicluster network.

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“…Many examples that use a conventional lens, GRIN rod lenses [44], and no lens have been reported as optical demultiplexers. Recently, the idea of free-space concave grating demultiplexers has been reported [45], [46]. These demultiplexers use a wavelength range of 16 nm (40 channels) and channel spacing of 0.4 nm.…”

Section: Implementation Of the Spanning Multichannel Network Using Wdmentioning

confidence: 99%

“…Depending on the optical components used, the size of the multichannel links is bounded either by the fan-out of the diffraction grating demultiplexers if the MUX-DEMUX scheme is used, or by the power loss of the star couplers if the optical star couplers are used. For the diffraction grating components, a fan-out of up to 40 channels has been reported [45], [46]. Taking this value as an upper limit, a fairly large SMLH network can be realized.…”

mentioning

confidence: 99%

A spanning multichannel linked hypercube: a gradually scalable optical interconnection network for massively parallel computing

Louri

Weech

Neocleous

1998

IEEE Trans. Parallel Distrib. Syst.

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Abstract-A new, scalable interconnection topology called the Spanning Multichannel Linked Hypercube (SMLH) is proposed. This proposed network is very suitable to massively parallel systems and is highly amenable to optical implementation. The SMLH uses the hypercube topology as a basic building block and connects such building blocks using two-dimensional multichannel links (similar to spanning buses). In doing so, the SMLH combines positive features of both the hypercube (small diameter, high connectivity, symmetry, simple routing, and fault tolerance) and the spanning bus hypercube (SBH) (constant node degree, scalability, and ease of physical implementation), while at the same time circumventing their disadvantages. The SMLH topology supports many communication patterns found in different classes of computation, such as bus-based, mesh-based, and tree-based problems, as well as hypercube-based problems. A very attractive feature of the SMLH network is its ability to support a large number of processors with the possibility of maintaining a constant degree and a constant diameter. Other positive features include symmetry, incremental scalability, and fault tolerance. It is shown that the SMLH network provides better average message distance, average traffic density, and queuing delay than many similar networks, including the binary hypercube, the SBH, etc. Additionally, the SMLH has comparable performance to other high-performance hypercubic networks, including the Generalized Hypercube and the Hypermesh. An optical implementation methodology is proposed for SMLH. The implementation methodology combines both the advantages of free space optics with those of wavelength division multiplexing techniques. A detailed analysis of the feasibility of the proposed network is also presented.

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High-performance, free-space ruled concave gratingdemultiplexer

Cited by 8 publications

References 5 publications

Optical spectral amplitude CDMA communication

Optical spectral amplitude CDMA communication

All-optical crossbar switch using wavelength division multiplexing and vertical-cavity surface-emitting lasers

A spanning multichannel linked hypercube: a gradually scalable optical interconnection network for massively parallel computing

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