OCDMA over WDM Transmission

Wang, Xu; Wada, Naoya; Hamanaka, T.; Miyazaki, Tetsuya; Cincotti, Gabriella; Kitayama, Ken‐ichi

doi:10.1109/icton.2007.4296043

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Meanwhile, the optical code division multiple access (OCDMA), which can multiplex a number of channels on a single wavelength and same time slot [9], is a promising choice for extending the capacity, so it is regarded as an attractive candidate for the next generation broadband access networks [10]. Additionally, the OCDMA system can provide multi-rate for different users and high security through coding data before transmiting and recovering it at the receiver [11].…”

Section: Introductionmentioning

confidence: 99%

40-Gbit/s PON over OCDMA uplink using DQPSK/OOK orthogonal remodulation

Chen

Zhang

et al. 2010

SPIE Proceedings

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A novel passive optical network (PON) over optical code division multiple access (OCDMA) uplink based on the differential quadrature reference phase shift keying (DQPSK)/ on-off Keying (OOK) orthogonal re-modulation and time domain phase coherent OCDMA en/decoder scheme has been proposed. The bit error rate and receiver sensitivity of the system have been investigated, and the security performance and MAI (Multi Access Interference) property of the OCDMA uplink data have also been investigated. The results show that the proposed PON system is more cost-effective with less power penalty, and the capacity and security of upstream data can be greatly improved .

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Section: Introductionmentioning

confidence: 99%

40-Gbit/s PON over OCDMA uplink using DQPSK/OOK orthogonal remodulation

Chen

Zhang

et al. 2010

SPIE Proceedings

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“…Although the most accepted FBG sensors are single FBGs, Bragg devices with multiple reflection bands can be custom-manufactured according to almost any required design. Superimposed FBGs have been demonstrated in silica fiber, mainly for code division multiple access (CDMA) applications and dense WDM multiplexing [ 4 , 5 , 6 , 7 ]. Another approach consists of the manufacture of super-structured fiber Bragg grating (SSFBG) devices, which have a complex index profile manufactured point by point until the custom spectrum is obtained [ 8 , 9 , 10 ], instead of a summation of single FBGs in the same location of the optical fiber.…”

Section: Introductionmentioning

confidence: 99%

A Code Division Design Strategy for Multiplexing Fiber Bragg Grating Sensing Networks

Triana

Pastor

Varón

2017

Sensors

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In this paper, an encoding strategy is used to design specialized fiber Bragg grating (FBG) sensors. The encoding of each sensor requires two binary codewords to define the amplitude and phase patterns of each sensor. The combined pattern (amplitude and phase) makes each sensor unique and therefore two or more sensors can be identified under spectral overlapping. In this way, we add another dimension to the multiplexing of FBG sensors, obtaining an increase factor ‘n’ to enhance the number of sensors that the system can handle. A proof-of-concept scenario with three sensors was performed, including the manufacturing of the encoded sensors. Furthermore, an interrogation setup to detect the sensors central wavelength was proposed and its working principle was theoretically developed. Results show that total identification of the central wavelength is performed under spectral overlapping between the manufactured sensors, achieving a three-time improvement of the system capacity. Finally, the error due to overlapping between the sensors was assessed obtaining approximately 3 pm, which makes the approach suitable for use in real measurement systems.

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“…In fact, manufacturing of 'complex' devices has been successfully achieved for example for encryption in Optical Code Division Multiple Access (OCDMA) communication systems [7]. In OCDMA, several approaches have been carried out, see [8], [9], recently, Discrete Prolate Spheroidal Sequences (DPSS) have been also proposed [10] and experimentally validated [11] showing a high encryption potential and very suitable features for channeling in WDM systems due to their fixed optical bandwidth. The accurate and repeatable manufacturing process of SuperStructured Fiber Bragg Gratings (SSFBG) suggests the idea of manufacturing more elaborated structures to act as sensors in an optical sensing network, therefore, combining the sensing properties of standard FBG sensors with the advantages of encoding in optical systems would definitely be a major progress leading to enhance the performance of sensing systems.…”

Section: Introductionmentioning

confidence: 99%

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Triana

Pastor

Varón

2017

J. Lightwave Technol.

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Abstract-We propose and demonstrate a sensing system with fiber Bragg grating (FBG) sensors designed as Discrete Prolate Spheroidal Sequences (DPSS). In this way, we can encode all of the sensing devices in the network making sure that each sensor is completely distinguishable from each other even under overlapping conditions. Since these devices are complex structures involving unique magnitude and phase response, the demodulation method should be able to recover the associated magnitude and phase response in order to identify each device in the sensing network. To do so, we use a Single Side Band (SSB) modulated optical source sweeping over the operational wavelength range of the sensors, the reflected signal from the sensors is sent to a Vector Network Analyzer (VNA) in which it is obtained the magnitude and phase ratio of the network in the microwave domain. Experimental demonstration has been carried out including the manufacturing of DPSS structures. Feasibility of the interrogation technique for devices involving magnitude and phase distinction has been validated, not only to identify encoded sensors in a measurement network but also to allow overlapping between them, which allow to increase the number of sensors allocated in the sensing network.

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OCDMA over WDM Transmission

Cited by 9 publications

References 18 publications

40-Gbit/s PON over OCDMA uplink using DQPSK/OOK orthogonal remodulation

40-Gbit/s PON over OCDMA uplink using DQPSK/OOK orthogonal remodulation

A Code Division Design Strategy for Multiplexing Fiber Bragg Grating Sensing Networks

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

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