New carrier generation approach for fiber-radio systems to overcome chromatic dispersion problems

Hilt, Attila; Vilcot, Anne; Berceli, T.; Marozsak, T.; Cabon, B.

doi:10.1109/mwsym.1998.700665

Cited by 8 publications

(2 citation statements)

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“…From the signal generation point of view, both Scheme A and B exhibited almost similar performance using the respective formats. Schemes A and B were chosen being a perfect representation of spectrally efficient and dispersion tolerant OCS-DSB and OSSBþC modulation techniques [17]- [19]. In our demonstrations, receiver sensitivities in RZ formats showed better performance compared with the NRZ formats.…”

Section: Discussionmentioning

confidence: 93%

Multilevel Intensity Modulations for Simplified Full-Duplex Millimeter-Wave Radio-Over-Fiber System for Gigabit Access

2012

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Multilevel M-ary amplitude-shift-key (M-ASK) intensity modulation formats have been proposed and experimentally demonstrated in millimeter-wave radio-over-fiber (mm-wave RoF) system. In order to demonstrate multilevel intensity modulation for spectrally efficient implementation, return-to-zero (RZ) and non-RZ (NRZ) implementations for both 4-ASK and 8-ASK modulation formats are utilized in full-duplex RoF link. Hence, for downlink, two different signal generation schemes are utilized in this paper for optical mm-wave generation and transport using optical heterodyning of two unlocked lasers. For uplink, similar RF self-homodyning technique is applied at the base station (BS) to simplify the signal translation process. Theoretical analyses and experimental results using the proposed technique for M-ASK modulation formats confirm the system's performance. Apart from the bandwidth-efficient realization of the proposed schemes, demonstrated full-duplex RoF techniques avoid most of the high-speed electrooptic and RF devices from both the central station (CS) and BSs keeping the optical mm-wave generation, optical transport, and BSs simpler in both directions.Index Terms: Fiber optics systems, heterodyning, homodyning, multilevel modulation, radio over fiber (RoF), microwave photonics.In order to exploit the congestion-free spectral domain of these frequency bands, the mm-wave radio over fiber (RoF) is an attractive solution. In a mm-wave RoF system, a low-loss optical fiber link is established to transmit mm-wave signals where central stations (CSs) processes the signal generation, data modulation, upconversion etc., and the base stations (BSs) are distributed through the common fiber network [2]. As the BSs need to transmit the mm-wave signal to the end user, the operational coverage of BSs reduces to pico-or femtocells due to inherent high atmospheric attenuation at mm-wave bands [3]. This translates to a larger number of BS requirements to allocate coverage to the total geographic area. Low-cost optical mm-wave generation, photonic frequency upconversion strategies and efficient modulation formats at the CS are therefore the main drivers for simplified, efficient, and cost-effective distribution of signals to the remote BSs. Minimization of high-speed components from the BS and simpler signal translation schemes play a significant role in this regard to meet the performance-to-cost-ratio requirements.In our recent demonstrations [4], [5], we proposed and demonstrated mm-wave RoF system where two uncorrelated optical carriers were heterodyned without any phase/frequency locking, and later, the transmitted data was recovered using phase-insensitive incoherent demodulation technique, i.e., RF self-homodyning. Such technique removed any phase/frequency locking, highspeed modulators, and LO at the generation and transport of optical mm-wave signals. Additionally, it avoided high-speed RF devices (i.e., LO) at the BS and relaxed signal translations for both downlink and uplink directions, respectively. Simple modulation ...

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Section: Discussionmentioning

confidence: 93%

Multilevel Intensity Modulations for Simplified Full-Duplex Millimeter-Wave Radio-Over-Fiber System for Gigabit Access

2012

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“…However, the intensity distortion of RF carriers and cyclic optical power variations become more critical for W-band RoF transmission due to optical fiber impairments such as chromatic dispersion (CD) and polarization mode dispersion (PMD) (Avo, et al, 2010), (Hilt, et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

A novel dispersion monitoring technique in W-band radio-over-fiber signals using clustering on asynchronous histograms

2014

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A novel dispersion monitoring technique in W-band radio-over-fiber signals using clustering on asynchronous histogramsNueva técnica de monitoreo sobre la dispersión en las señales de radiosobre-fibra en la banda W usando clustering en histogramas asíncronos J. J. Granada 1 , A. M. Cárdenas 2 and N. Guerrero 3 ABSTRACTRadio over Fiber (RoF) systems have been proposed as a promising solution for transmitting radiofrequency signals at high data rates over long distances. To reach data rates in the Gbps range, studies indicate using the W-Band (75 -110 GHz). However, in this frequency band, chromatic dispersion becomes an issue that increases the bit-error-rate. This paper presents a novel digital dispersion monitoring technique for RoF systems based on asynchronous histogram analysis. This method quantifies the intensity level of the distortion of a radiofrequency demodulated signal by a dispersion factor. This dispersion factor is calculated using an enhanced clustering approach, which carries out a Gaussian fitting technique through the expectation-maximization algorithm. Dispersion monitoring was performed on radiofrequency transmission simulations using non-return-to-zero and binary phase-shift keying modulated signals over 80 km of optical fiber at 60, 75 and 100 GHz. The bit error rate is estimated and compared to the dispersion factor, showing that the behavior of the dispersion effects are not proportional to the increase of carrier frequency, bit rate and distances. This novel monitoring method can be used to estimate the feasibility of RoF systems for future hybrid networks under specific transmission parameters such as fiber length, modulation format, and carrier frequency.Keywords: Chromatic Dispersion, Optical Monitoring, Radio-over-Fiber. RESUMENLos sistemas de Radio sobre Fibra (RoF), se proponen como una solución prometedora para transmitir señales de radiofrecuencia a altas tasas de transmisión y sobre largas distancias. Algunos estudios proponen el uso de frecuencias portadoras en la banda W (75 -110 GHz), para lograr transmisiones en el rango de los Gbps. Sin embargo, en este rango de frecuencias la dispersión cromática, se convierte en uno de los principales factores para el incremento de la tasa de error del bit.Este artículo presenta un nuevo método de monitoreo de la dispersión, basado en histogramas asíncronos para sistemas de RoF. El método planteado cuantifica el nivel de distorsión de la señal de radiofrecuencia, mediante un valor adimensional llamado: factor de dispersión. Dicho factor, se calcula mediante una técnica de agrupamiento, la cual se lleva a cabo usando ajustamiento gaussiano, mediante el algoritmo de máxima esperanza sobre histogramas asíncronos. El monitoreo de la dispersión se realiza sobre una plataforma de simulación, donde se transmiten las señales de radiofrecuencia, empleando modulación No retorno a cero (NRZ) y modulación binaria con desplazamiento de fase (BPSK), sobre 80 km de fibra óptica a 60, 75 y 100 GHz. Así, se estima la tasa de error de bit y se compara con ...

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Microwave harmonic generation in fiber-optical links

Hilt¹

13th International Conference on Microwaves, Radar and Wireless Communications. MIKON - 2000. Conference Proceedings (IEEE Cat.

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New carrier generation approach for fiber-radio systems to overcome chromatic dispersion problems

Cited by 8 publications

References 8 publications

Multilevel Intensity Modulations for Simplified Full-Duplex Millimeter-Wave Radio-Over-Fiber System for Gigabit Access

Multilevel Intensity Modulations for Simplified Full-Duplex Millimeter-Wave Radio-Over-Fiber System for Gigabit Access

A novel dispersion monitoring technique in W-band radio-over-fiber signals using clustering on asynchronous histograms

Microwave harmonic generation in fiber-optical links

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