Construction of two-dimensional wavelength/time optical orthogonal codes using difference family

Gu, F.-R.; Wu, Jingshown

doi:10.1109/jlt.2005.855860

Cited by 27 publications

(8 citation statements)

References 26 publications

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“…time versus frequency domain and/or amplitude versus phase spectra. To increase the available coding space, time-wavelength (two-dimensional) coding schemes have been proposed [88][89][90][91] where each code chip corresponds to a specific time position and wavelength position within a bit, as determined by a code matrix. However, this brings considerable complexity to the system implementations.…”

Section: Motivations For Optical Cdma Communicationsmentioning

confidence: 99%

Introduction to Optical Communications

Ghafouri‐Shiraz

Karbassian

2012

Optical CDMA Networks

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The invention of the solid state ruby laser (acronym for light amplification by stimulated emission of radiation) in May 1960 [1] and the He-Ne gas laser [2] in December 1960 has led to some wide-ranging and very significant scientific and technological progress. This so-called 'discovery of the century', followed by the first use of semiconductor lasers [3][4][5] in communications, heralded the start of optical communications. The laser provided a powerful coherent light source together with the possibility of modulation at high frequency, and this opened up a new portion of the electromagnetic spectrum with frequencies many times higher than those commonly available in radio communication systems. In addition the narrow beam divergence of the laser made enhanced free-space optical transmission a practical possibility.Since optical frequencies are of the order of 100 THz, and information capacity increases directly with frequency bandwidth, the laser potentially offers a few order of magnitude increase in available bandwidth compared with microwave systems. Thus, by using only a small portion of the available frequency spectrum, a single laser could, in principle, carry millions of telephone conversations or TV channels.With the potential of such wideband transmission capabilities in mind, a number of experiments [6] using atmospheric optical channels were carried out in the early 1960s. These experiments showed the feasibility of modulating a coherent optical carrier wave at very high frequencies. However, the high cost of development for all the necessary components, and the limitations imposed on the atmospheric channel by rain, fog, snow and dust make such high-speed systems economically unattractive. However, numerous developments of free-space optical channel systems operating at baseband frequencies were in progress for earth-to-space communications [7,8].It soon became apparent that some form of optical waveguide was required. By 1963, bundles of several hundred glass fibres were already being used for small-scale Optical CDMA Networks: Principles, Analysis and Applications, First Edition. Hooshang Ghafouri-Shiraz and M. Massoud Karbassian.

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Section: Motivations For Optical Cdma Communicationsmentioning

confidence: 99%

Introduction to Optical Communications

Ghafouri‐Shiraz

Karbassian

2012

Optical CDMA Networks

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“…To overcome this problem, a two‐dimensional (2D) (constant‐weight) coding (also called multiwavelength CWOOCs) was introduced in . Recently many researchers are working on constructions and designs of 2D CWOOCs, see for some of the examples.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this problem, a twodimensional (2D) (constant-weight) coding (also called multiwavelength CWOOCs) was introduced in [37]. Recently many researchers are working on constructions and designs of 2D CWOOCs, see [6,7,13,21,[29][30][31][32] for some of the examples.In 1996, Yang introduced multimedia optical CDMA communication system employing variable-weight OOCs (1D VWOOC) [36]. In this CDMA system, the subscribers with different code weights will have different bit error rate (BER) performance.…”

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confidence: 99%

Bounds and Constructions for Two‐Dimensional Variable‐Weight Optical Orthogonal Codes

Cheng

Jiang

2013

J of Combinatorial Designs

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Optical orthogonal codes (1D constant‐weight OOCs or 1D CWOOCs) were first introduced by Salehi as signature sequences to facilitate multiple access in optical fibre networks. In fiber optic communications, a principal drawback of 1D CWOOCs is that large bandwidth expansion is required if a big number of codewords is needed. To overcome this problem, a two‐dimensional (2D) (constant‐weight) coding was introduced. Many optimal 2D CWOOCs were obtained recently. A 2D CWOOC can only support a single QoS (quality of service) class. A 2D variable‐weight OOC (2D VWOOC) was introduced to meet multiple QoS requirements. A 2D VWOOC is a set of 0, 1 matrices with variable weight, good auto, and cross‐correlations. Little is known on the construction of optimal 2D VWOOCs. In this paper, new upper bound on the size of a 2D VWOOC is obtained, and several new infinite classes of optimal 2D VWOOCs are obtained.

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“…This can be overcome by using two-dimensional (2-D) or three-dimensional (3-D) OCDMA. Various types of 2-D OOCs [4] have been reported. 3-D architectures are space-wavelength-time [5] among others.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of new code families for three-dimensional OCDMA

Kumar

Pathak

Chakrabarti

2008

2008 2nd International Symposium on Advanced Networks and Telecommunication Systems

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A new code design algorithm for application in three-dimensional (3-D) Optical Code Division Multiple Access (OCDMA) for asynchronous optical fiber communication is proposed. In this paper, 3-D refers to space-wavelength-time spreading. The performance analysis of the proposed algorithm in 3-D Multiple Pulses per Plane codes is shown. This design ensures a maximum cross-correlation of 1 between any two codes. The performance metrics that have been investigated are bit error rate due to Multiple Access Interference for varying number of simultaneous users and, cardinality for different values of temporal length.

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Construction of two-dimensional wavelength/time optical orthogonal codes using difference family

Cited by 27 publications

References 26 publications

Introduction to Optical Communications

Introduction to Optical Communications

Bounds and Constructions for Two‐Dimensional Variable‐Weight Optical Orthogonal Codes

Design and analysis of new code families for three-dimensional OCDMA

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