All-optical pseudorandom binary sequence (PRBS) generator using the hardlimiters

Chattopadhyay, Tanay; Moniem, Tamer A.; Maity, Hirak Kumar

doi:10.1016/j.ijleo.2012.12.072

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…4b the optical schematic. Every change in phase position between the two generated m-sequences causes a new sequence to be generated (Chattopadhyay et al 2013). When specially selected m-sequences, also called preferred m-sequences are used, the generated code is called the Gold code (Maity and Maity 2012).…”

Section: Gold Sequence Generatormentioning

confidence: 99%

All-optical TOAD based new binary sequence generator

et al. 2016

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Spread-spectrum communication, with its inherent interference attenuation capability, has over the years become an increasingly popular technique for use in many different systems. In multiuser environment, Gold sequences are an important class of sequences that allow construction of long sequences. To achieve this goal, a modified Gold code generator in all-optical domain using semiconductor optical amplifier based terahertz optical asymmetric demultiplexer (TOAD) is explored in this paper. All-optical Gold code generator circuit realization is TOAD based D flip-flop and exclusive-OR logic gates in a configuration analogous to the standard electronic setup, with properties similar to that of both Gold and Kasami sequences. It is compatible with a multichannel direct sequence spread spectrum system. Numerical simulation confirmed the circuit's feasibility and performance in terms of the choice of the critical parameters. However, the proposed sequence generator circuit is more complex than the existing Gold sequence generator, but it is less complex than the Kasami sequence and has performance better than both.Keywords Terahertz optical asymmetric demultiplexer Á R-S and D-flip-flop Á m-Sequence Á Gold code Á Pseudorandom binary new sequence & Goutam Kumar Maity

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Section: Gold Sequence Generatormentioning

confidence: 99%

All-optical TOAD based new binary sequence generator

et al. 2016

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“…The CDMA system allows multiple users to transmit at the same time in the same frequency band [3]. The CDMA suffers from the high blocking probability because the number of orthogonal codes is limited.…”

Section: Ovsf Codes In the Modern Cdmamentioning

confidence: 99%

“…The overall optical design of linear feedback shift register (LFSR) of pseudorandom binary sequence (PRBS) generator of CDMA using the hardlimiter and a set of series all optical D flip flops has been demonstrated by Tanay and Tamer et al (2013) [3]. Zoirios et al (2011) [4] have demonstrated an all optical pseudorandom generators using the Terahertz optical asymmetric Demultiplexer (TOAD).…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the basic operation and design of all-optical OVSF code generator of the modern CDMA used in Universal Mobile Telecommunication System (UMTS) standard are proposed. The overall optical design in the optical communication system eliminates the conversion from optical to electrical and vice versa and reduces the latency due to this conversion [3].…”

Section: Introductionmentioning

confidence: 99%

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All Optical Ovsf Code Generator Realization Using Optical Flip Flop and Optical Hardlimitters

Moniem

Mosilhy

2015

JES. Journal of Engineering Sciences

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The orthogonal variables spreading factor (OVSF) provides variables data rates to flexible support many applications with different bandwidth. This paper presents an optical OVSF code generator using all optical gates and a set of all optical flip-flops based on two coupled polarization switches (PSWs). The optical OVSF code generator helps to use the OVSF code technique in optical communications. The general objective is to make the OVSF code tree suitable to support a lot of users in the optical communication links. The overall design and the results are discussed through the realization and the computing numerical simulation to confirm its operation and feasibility. The proposed scheme has been theoretically demonstrated for a spreading factor of 4 and 8.

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“…High-speed PRBS generator is very complicated with high cost in electric domain for the bit rate over 40 Gb/s. Though several methods of all-optical PRBS generation have been shown recently [2][3][4], there were also a number of problems with these solutions. For instance, Wagemans has proposed a scheme of PRBS generator based on double-loop flip-flop with a complex structure and a low rate at 10 kb/s [5].…”

Section: Introductionmentioning

confidence: 99%