Demonstration of a rapidly tunable optical time-division multiple-access coder

Prucnal, Paul R.; Krol, Mark F.; Stacy, John L.

doi:10.1109/68.76879

Cited by 52 publications

(14 citation statements)

References 11 publications

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“…Figure 1 shows the structure of the proposed optical encoder. The proposed tunable OCDMA encoder/decoder structure is based on the 2 × 2 optical switches act as tunable optical filters provides incoherent configuration [11,12]. For the transmission of data bit one, the modulated optical pulses are launched at the input of the encoder where they are demultiplexed into P pulses by the wavelength division de-multiplexer.…”

Section: D Ocdma Encoder/decoder Structurementioning

confidence: 99%

Two Dimensional Tunable Optical-CDMA System

Yadav

Kaur

2016

IJEECS

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In this work an experimental demonstration is proposed to implement the synchronous optical code division multiple access system using two dimensional wavelength hopping and time spreading optical prime code is presented. An optical CDMA system is configured on latest version of optisystem by optiwave for the 20 users (Prime Number = 5) IntroductionIn recent time, Optical Code Division Multiple Access (O-CDMA) is an emerging technology for providing a reliable and scalable communication system. OCMDA support multiple user access over large bandwidth provided by the optical fiber. OCDMA is a suitable multiple access technique for access network and LAN because of its flexibility and scalability to the network topology [1,2]. Optical CDMA has been studied by lot of researchers in past for many years because of fast and secure data transmission feature inherently lies in the optical fiber while efficient traffic management and zero access delay is offered by CDMA technique [3]. With the advancement in optical fiber and optical components the transmission over the fiber has also get improved considerably.The performance of Optical CDMA system significantly depends upon the optical code and system configuration [4]. As in communication system, each subscriber communicates with others at same or different time. Thus each user is typically assigned a unique code and has a tunable encoder and decoder. The encoder and decoder must be tuned to that particular code in order to transmit the information successfully even though in the presence of other user in the system [5]. Researchers have proposed many coding techniques like 1D spectral phase encoding, 1D spectral amplitude coding, 1D time spread coding, 2D wavelength hopping and time spreading coding [6] etc.The presented 2D tunable Optical CDMA system is computer program controlled, wellconfigured, reliable and cost effective. This is because of the superior designing using multimode fiber as well as the ability of controlling many users concurrently and since non interfering codes has been used. The features and feasibility of system are characterized in the paper as: the two dimensional prime code /prime code codeword is discussed in section 2. The structure of two dimensional encoder and decoder are explained in section 3. The experimental setup and results are presented in section 4. The performance of the 2D optical CDMA system has been compared with the 1D optical CDMA system for comparative analysis.The evaluation of result has been discussed in section 5. Conclusion has been summarized in section 6.

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Section: D Ocdma Encoder/decoder Structurementioning

confidence: 99%

Two Dimensional Tunable Optical-CDMA System

Yadav

Kaur

2016

IJEECS

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“…The fastly tunable optical delay line was designed in Ref. 9. Here its tunable range is limited to only P -1 of which the value is reasonable even if P is larger, and then is far less than code length L. All the P -1 tunable optical delay lines have completely the same structure.…”

Section: Optically Tunable Encoders For Prime Codesmentioning

confidence: 99%

<title>Advanced fiber optic networks using optical processing for future commercial aircrafts: multiple-access techniques and new hardware design</title>

Zhang

1993

SPIE Proceedings

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In this paper, we investigate to use the advanced fiber optic multiple-access networks in future high-performance commercial aircrafts to support the real time on-board flight control, sensing, voice communications, and TV distributions. Novel tunable optical code division multiple-access (OCDMA) networks using prime-code sequences are designed, which can be fastly programming to generate the required OCDMA sequences. Using the newly proposed OCDMA technique can efficiently build high-speed sensor data distribution networks which can guarantee parallel data communications and multiple connections to support real-time sensor data processing and distributed control. Optical time division multiple-access (OTDMA) networks can be used for on-board TV/HDTV distribution services. Due to the channel independence and protocol transparence of wavelengthdivision multiplexing (WDM), the WDM-based hybrid multiple-access techniques are very attractive to future avionics systems integration, which can achieve high communication efficiency and network utilization.

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“…is given by (15) where Boltzmann's constant; receiver noise temperature; receiver load resistance. Similarly, given and , the conditional probability density function of is (16) where the mean of , , can be expressed as (17) and the variance of , , can be written as In the second branch, the average photon arrival rate per pulse at the input of the APD is given by (19) Given , the conditional probability density function of the output after the sampler in the second branch can be expressed as (20) where the mean of , , can be expressed as (21) and the variance is given by (22) respectively. After subtracting the second signal from the first signal , we obtain the result signal at the input of the OOK demodulator as …”

Section: Performance Analysismentioning

confidence: 99%

“…Some examples of are presented in Table III. For suitable design, the subnanosecond reconfiguration time of the tunable optical delay lines may be feasible [19].…”

Section: A Transmitter Structurementioning

confidence: 99%

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Perfect difference codes for synchronous fiber-optic CDMA communication systems

Weng

2001

J. Lightwave Technol.

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Abstract-In this paper, we introduce the perfect difference sets and propose a synchronous fiber-optic code-division multiple-access system (CDMA) using these sets to generate the signature codes. Two interesting properties of these codes are discussed: 1) any two different codes are cyclic-shifted with each other and 2) the cross correlation between any two different codes is exactly one. Thus, we may treat these codes as quasi-orthogonal codes. Using the first property of these codes, we can simplify design of the transmitter. In the receiver, we can use the second property to effectively eliminate the multiple-user interference (MUI) without reducing the number of usable codes. Based on the proposed transmitter and receiver, the system performance is derived. The numerical examples reveal that the proposed system can provide reliable communication even under heavy load. We believe that the proposed system using perfect difference codes outperforms any other synchronous fiber-optic CDMA systems.Index Terms-Multiple-user interference (MUI), optical code division multiple access (CDMA), perfect difference set, spread spectrum.

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Demonstration of a rapidly tunable optical time-division multiple-access coder

Cited by 52 publications

References 11 publications

Two Dimensional Tunable Optical-CDMA System

Two Dimensional Tunable Optical-CDMA System

<title>Advanced fiber optic networks using optical processing for future commercial aircrafts: multiple-access techniques and new hardware design</title>

Perfect difference codes for synchronous fiber-optic CDMA communication systems

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