By Dr. Hongxi Yin, Prof. David J. Richardson (auth.)
Optical code department a number of entry (OCDMA) conversation community know-how will play a major position in destiny optical networks, comparable to optical entry and metropolitan quarter networks. OCDMA know-how can be utilized to enforce optical sign multiplexing and label switching on spine networks. Optical Code department a number of entry verbal exchange Networks - conception and Applications introduces the code concept of OCDMA, the equipment and applied sciences of OCDMA encoding and interpreting, the idea and strategies of examining OCDMA structures with a variety of receiver versions and knowing multiple-class companies with diverse bit charges and QoS. additionally, OCDMA community architectures, protocols and purposes are mentioned intimately. The updated theoretical and experimental effects on OCDMA platforms and networks also are said. lots of encoding/decoding examples and lots of research and simulation result of code and method performances are given. it's a worthwhile textual content and/or reference publication for postgraduates majoring in telecommunication and photonics to procure a well-knit theoretical origin and for engineers in R&D and administration of optical communications. Dr. Yin is an affiliate Professor of the varsity of Electronics Engineering and machine technological know-how at Peking collage, China, and was once a traveling learn Fellow of Optoelectronics examine Centre (ORC) at college of Southampton, united kingdom. Dr. Richardson is a Professor for optical communications and Deputy Director of ORC at college of Southampton, united kingdom, and is liable for a lot of the ORC's fiber comparable activities.
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Extra resources for Optical Code Division Multiple Access Communication Networks: Theory and Applications
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Fujii, K. Shirakawa, M. Nomura, and T. Yamaguchi: Cinema-class digital content distribution via optical networks (Invited). in Proc. OpNeTec, Pisa, Italy, Oct. 2004, pp11 18 [22] Ken-ichi Kitayama, Xu Wang, and Naoya Wada: OCDMA over WDM PON—Solution Path to Gigabit-Symmetric FTTH. 4, April 2006, pp1654 1662 [23] Prucnal, P. , Santoro, M. , Fan, T. : Spread Spectrum Fiber-optic Local Area Network Using Optical Processing. 5, May 1986, pp547 554 [24] Prucnal, R. P, Santoro, M. , Sehgal, S.
Optical encoding and decoding for incoherent OCDMA uses unipolar codes whereas the bipolar codes used in RF CDMA (radio frequency code division multiple access) have poor performance in OCDMA system and can not be used. Therefore, unipolar codes with good system performance need to be developed. Consequently, in the earlier years, the research on incoherent OCDMA focused on looking for and obtaining unipolar codes with good auto-and cross-correlations, such as OOC (optical orthogonal/pseudo-orthogonal codes)[26 29], PC (prime codes)[23, 30], QCC (quadratic congruence codes)[31], etc.
6) If the characteristic functions of the subsets Si (1İiİp m 2) , in {0,1," , p 2 m 1} , may be taken as the codewords of an OOC we can obtain an ( p 2 m 1, p m 1, 2) optimal OOC[5, 6]. 2), and therefore, the constructed OOC is an optimal OOC. [6]. 7 Construct an (63,9, 2) (26 1, 23 1, 2) optimal optical orthogonal code. We can get m 3 , p 2 and p m 2 6 . D is an primitive element of the finite field GF ( p 2 m ) GF (26 ) and E Dp m 1 . Let’s choose an irreducible polynomial 6 of degree 6, x x 1 , over GF ( p ) GF (2) and from the irreducible polynomial, the element table of GF (26 ) modulo-( x6 x 1 ) can be obtained as follows: D0 {1 D1 { D D2 {D2 D3 {D3 D4 {D4 D5 {D5 D6 { D 1 38 D7 {D2 D D8 { D3 D2 D9 {D4 D3 D 10 { D 5 D 4 D 11 { D 5 D 1 D 12 { D 2 1 D 13 { D 3 D D 14 { D 4 D 2 D 15 { D 5 D 3 D 16 { D 4 D 1 D 17 { D 5 D 2 D D 18 { D 3 D 2 D 1 D 19 { D 4 D 3 D 2 D D 20 { D 5 D 4 D 3 D 2 2 One-dimensional OCDMA Codes Continued D 21 { D 5 D 4 D 3 D 1 D 22 { D 5 D 4 D 2 1 D 23 { D 5 D 3 1 D 24 { D 4 1 D 25 { D 5 D D 26 { D 2 D 1 D 27 { D 3 D 2 D D 28 { D 4 D 3 D 2 D 29 { D 5 D 4 D 3 D 30 { D 5 D 4 D 1 D 31 { D 5 D 2 1 D 32 { D 3 1 D 33 { D 4 D D 34 { D 5 D 2 D 35 { D 3 D 1 D 36 { D 4 D 2 D D 37 { D 5 D 3 D 2 D 38 { D 4 D 3 D 1 D 39 { D 5 D 4 D 2 D D 40 { D 5 D 3 D 2 D 1 D 41 { D 4 D 3 D 2 1 D 42 { D 5 D 4 D 3 D D 43 { D 5 D 4 D 2 D 1 D 44 { D 5 D 3 D 2 1 D 45 { D 4 D 3 1 D 46 { D 5 D 4 D D 47 { D 5 D 2 D 1 D 48 { D 3 D 2 1 D 49 { D 4 D 3 D According to this table, equation Si be transformed into equation (D y 1)9 D 50 { D 5 D 4 D 2 D 51 { D 5 D 3 D 1 D 52 { D 4 D 2 1 D 53 { D 5 D 3 D D 54 { D 4 D 2 D 1 D 55 { D 5 D 3 D 2 D D 56 { D 4 D 3 D 2 D 1 D 57 { D 5 D 4 D 3 D 2 D D 58 { D 5 D 4 D 3 D 2 D 1 D 59 { D 5 D 4 D 3 D 2 1 D 60 { D 5 D 4 D 3 1 D 61 { D 5 D 4 1 D 62 { D 5 1 D 63 { 1 { f ( x) : ( x 1) p m 1 E i , 1İiİp m 2} can D 9i , 1İiİ6 , where the values of y satisfy 1İyİp 2 m 1 and thus y has five values for each value of i .