Noncoherent Spectral/Spatial Optical CDMA System Using 2-D Diluted Perfect Difference Codes

Yeh, Bih-Chyun; Lin, Cheing-Hong; Yang, Chang‐Biau; Wu, Jingshown

doi:10.1109/jlt.2008.2010721

Cited by 43 publications

(7 citation statements)

References 17 publications

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“…Based on the above mentioned assumption, the power spectral densities of the received optical signals can be written as [2], [4]; (12) where the effective source power at the receiver, f is the source bandwidth, k 2 is the code weight of the time spreading code sequence, W is the number of simultaneous active users, is the data bit of the th user, which can be "1" or "0", M is the code length of the wavelength encoding code sequence and N is the code length of the time spreading code sequence, represents an element of the th user's code word while is the unit step function. Hence, the power spectral density during one bit period of optical signals at PD0, PD1, PD2 and PD3 of the receiver by using cross-correlation between codeword and can be written as: (11) where k 1 is the code weight of the wavelength encoding code sequence. Furthermore, the wavelength-time encoding, of code sequence as shown in Table IV can be divided into four groups [4]: i) g=0, h=0 ii) g =0, h 0 iii) g 0, h h =0 iv) g 0, h 0.…”

Section: Performance Analysismentioning

confidence: 99%

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An optimal cardinality of wavelength/time incoherent OCDMA system using 2-D hybrid FCC-MDW code

Keraf

Aljunid

Arief

et al. 2014

2014 2nd International Conference on Electronic Design (ICED)

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A 2-Dimensional (2-D) Wavelength/Time (W/T) scheme is proposed for spectral amplitude coding OCDMA network system. The new hybrid codes are utilizing Flexible Cross Correlation (FCC) and Modified Double Weight (MDW) codes which both codes have good correlation properties and capable to suppress multiple access interference (MAI). From the numerical calculation, it has been shown that this new hybrid code effectively suppresses the phase Induced Intensity Noise (PIIN) and eliminates MAI. Furthermore, the cardinality of this proposed code accommodates 150% and 275% improvement compared to 2-D PD code and 2-D M-Matrices code respectivelyat the BER=10 -9 . As a result, the performance of the system can be improved as well as support much more simultaneous users compared to Perfect Difference (PD) and M-matrices codes.

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Section: Performance Analysismentioning

confidence: 99%

“…Various 2-D codes have been introduced to suppress PIIN and eliminate MAI such as in [2], [4], [11]. 2-D Spatial/Spectral Perfect Difference (PD) Codes proposed by Cheing et al In [4] has a cancellation property of the MAI as well as greatly reduced the PIIN.…”

Section: Introductionmentioning

confidence: 99%

An optimal cardinality of wavelength/time incoherent OCDMA system using 2-D hybrid FCC-MDW code

Keraf

Aljunid

Arief

et al. 2014

2014 2nd International Conference on Electronic Design (ICED)

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“…As well, both 2D-DCS and 2D-MS codes can enhance OCDMA system by augmenting the code length of spatial component and decreasing the code length of spectral component. In (Bih-Chyun Yeh et al 2009), 2D-diluted PD (2D-DPD) code is derived from PD code. Based on that, it suffers from constant cross correlation value.…”

Section: Introductionmentioning

confidence: 99%

A performance investigation of SAC-OCDMA system based on a spectral efficient 2D cyclic shift code for next generation passive optical network

et al. 2021

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A two dimensional spectral/spatial cyclic shift (2D-CS) optical code division multiple access (OCDMA) systems is proposed for a potentially next generation passive optical network (NG-PON) implementation called (2D-CS NG-OCDMA-PON) system. The2D-CS proposed code is characterized by a high capacity and a zero cross correlation property leads to completely eliminating the multiple access interference (MAI) effect that is considered as the main OCDMA system drawback. Firstly, the 2D-CScode construction is investigated from 1D-CS code. Secondly, a system description is provided by exhibiting the transmitter and receiver architecture in the PON context. Analytical analysis reveals that our proposed 2D-CScode outperforms similar codes such as perfect difference (2D-PD) and dynamic cyclic shift (2D-DCS) codes in terms of spectral efficiency, simultaneous network subscribers and data bit rate. In addition, based on numerical analysis 2D-CS NG-OCDMA-PON system shows a good system performance by means of avery low BER and a high Qfactor values equal to10 −26 and 10.41 dB, respectively. Likewise, for four users and free-amplification the achievable reach ability distance of the NG-OCDMA-PON system is 63.21 km, 43.57 km and 33.2 km while Q-factor is equal to 6 dB at a bit rate of 622Mb/s, 1Gb/s and 1.5 Gb/s, respectively. On the other side, according to the system setup the number of single mode fiber (SMF) is reduced to the half compared to other 2D-OCDMA-PON systems based on enhanced multi diagonal (EMD) and single weight ZCC (SWZCC) codes.

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“…Various alternative approaches in OCDMA have been proposed to overcome PIIN reduction and improved system performance [3][4][5][6][7][8][9]. The 2-D Hybrid Codes with suppressed PIN and MAI cancelation [6], Zou Wei et al and Ghafouri Shiraz et al [7] introduced fixed in-phase spectral cross-correlation equal to one spectral coding, 2-D Perfect Difference Code (PDC) suppressed PIIN and eliminate MAI [8], 2-D Modified Quadratic Congruence (MQC) Code with fixed crosscorrelation resulted in complete elimination of MAI by differential detection [9] and 2-D M-sequence code spread in the wavelength domain and spread in the time domain using optical delay lines [10].…”

Section: Introductionmentioning

confidence: 99%

“…These techniques have focused on developing code families with maximum auto-correlation and maintaining minimum cross-correlation, to reduce the bottleneck inter-channel beating noise at detectors [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Phase-induced intensity noise suppression wavelength-time modified double weight codes optical code division multiple access systems

Arief

Aljunid

Anuar

et al. 2012

2012 IEEE 3rd International Conference on Photonics

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The wavelength-time modified double weight (MDW) optical division multiple access (OCDMA) scheme to compensate bit error rate (BER) and phase-induced intensity noise (PIIN) in incoherent OCDMA systems is proposed. The analysis permits thorough understanding of PIIN, shot and thermal noises effect on 2-Dimensional (2-D) MDW OCDMA system performance. PIIN is the dominant noise factor in the OCDMA timespreading scheme. The 2-D MDW code shows better tolerance to PIIN in comparison to others with enhanced system performance. 2-D PDC and 2-D MQC OCDMA code.

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Noncoherent Spectral/Spatial Optical CDMA System Using 2-D Diluted Perfect Difference Codes

Cited by 43 publications

References 17 publications

An optimal cardinality of wavelength/time incoherent OCDMA system using 2-D hybrid FCC-MDW code

An optimal cardinality of wavelength/time incoherent OCDMA system using 2-D hybrid FCC-MDW code

A performance investigation of SAC-OCDMA system based on a spectral efficient 2D cyclic shift code for next generation passive optical network

Phase-induced intensity noise suppression wavelength-time modified double weight codes optical code division multiple access systems

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