Progress in externally modulated AM CATV transmission systems

Nazarathy, Moshe; Berger, J.; Ley, A.J.; Levi, I.M.; Kagan, Y.

doi:10.1109/50.210575

Cited by 109 publications

(36 citation statements)

References 23 publications

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“…However, a few approaches that have been applied specifically to fibre-optic links are worth mentioning as closing remarks for this subsection. Nazarathy et al [53] thoroughly investigated two such circuit-based techniques -predistortion and feedforward distortion -for their ability to counteract nonlinearity in long-distance (30 km) CATV links. Patterson et al [54] combined these two techniques into a linearization architecture they called 'quasi-feedforward compensation' that successfully reduced both the second-and third-order distortion in broadband links.…”

Section: Techniques For Improving Intrinsic Link Dynamic Rangementioning

confidence: 99%

Analogue Microwave Fibre‐Optic Link Design

Iezekiel

2009

Microwave Photonics

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Section: Techniques For Improving Intrinsic Link Dynamic Rangementioning

confidence: 99%

Analogue Microwave Fibre‐Optic Link Design

Iezekiel

2009

Microwave Photonics

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“…A typical EOM consists of an interferometer in which one or both arms include an electro-optical element; for example a Mach-Zehnder interferometer and its variations such as the Michelson interferometer. Unfortunately, the transfer function, shown in equation (1), of EOM based on interferometric schemes is not linear. This implies that the process of transforming microwave signal into the optical domain will inevitably produce unwanted harmonics and intermodulation products.…”

Section: Introductionmentioning

confidence: 99%

“…In order to minimize the unwanted harmonics and intermodulation components at the output of the EOM based on interferometer schemes, several attempts have been made to linearize its transfer characteristic of equation (1); see for example references [1][2][3][4][5][6][7] and the references cited therein. Of particular interest here is the technique based on combining a Michelson interferometer and low-Q off-resonant Gires-Tournois interferometers, shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Large Signal Analysis of the Michelson Interferometer with Gires-Tournois Interferometers in its Arms

Abuelma’atti

2008

Int J Infrared Milli Waves

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A mathematical model for the transfer function of the Michelson interferometer with Gires-Tournois interferometers in its arms is presented. The model, basically a sineseries function, can easily yield closed-form expressions for the amplitudes of the harmonic and intermodulation components of the output when the input is formed of large-amplitude multisinusoidal voltage. The special case of two-tone equal-amplitude input voltage is considered in detail. The results show that the third-order intermodulation component is always higher than the third-harmonic component. The results also show that the linearity of the Michelson interferometer with Gires-Tournois interferometers in its arms improves with the increase of the front mirror reflectivity. Moreover, the results show that the thirdorder intermodulation exhibits a minimum for relatively large values of the front mirror reflectivity. Furthermore, compared with the traditional Mach-Zehnder interferometer, the results show that a reduction of 15 dB in the third-order intermodulation can be achieved even for relatively small values of the front mirror reflectivity.

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“…Para conseguirlo, se actúa sobre diferentes parámetros del modulador MZM, desde la forma de la de RF moduladora ó parámetros constructivos del modulador como la longitud de sus electrodos. Las técnicas de linealización se pueden clasificar en tres grandes grupos según los parámetros modificados: (i) técnicas de linealización eléctrica que actúan sobre la señal RF [Naz93], [Chi99], (ii) técnicas de linealización mediante post-procesado de la señal modulada [Hel00] y (iii) técnicas de linealización todo ópticas que proponen cambios en la estructura interna y en parámetros físicos u ópticos [Kor90], [Oga92], [Bet94], [Shi00].…”

Section: Técnicas De Linealización De Moduladores Externosunclassified

“…Otra técnica es la retroalimentación de un segundo modulador con una señal de error proveniente de comparar la salida modulada del primer modulador con la señal de RF. La realimentación de este error permite al segundo modulador actuar de forma diferente y linealizar la señal [Naz93].…”

Section: Linealización Eléctrica Y Mediante Post-procesadounclassified

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

Soler¹

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IVPersonal Area Network). L'objectiu d'aquest estudi és obtenir màrges de seguretat per a garantir la interoperatibilitat d'ambdues tecnologies ràdio, els quals es poden aplicar en el futur desenvolupament de tècniques avançades de mitigació de la interferència com detecció i exclusió (DAA, Detect-and-Avoid), dins de futures aplicacions com les anomenades cognitive radio.Després, s'estudia la coexistència de MB-OFDM UWB i WiMAX IEEE 802.16e en xarxes òptiques d'accés basades en sistemes RoF. S'avaluen dos escenaris experimentals: en el primer, s'avalua un sistema RoF amb fibra multimode, i el segon, un sistema RoF amb fibra monomode. Els resultats permeten obtenir màrges de seguretat i abast màxim per al desplegament de sistemes RoF segons els tipus de fibra. Al mateix temps, es demostra i avalua experimentalment una nova tècnica de multiplexació per divisió en polarització de la transmissió òptica, per a millorar la coexistència en sistemes RoF.Finalment, aquesta Tesi Doctoral presenta l'estudi del modulador electro-òptic Mach-Zehnder, com a peça clau que limita el marge dinàmic de les transmissions als sistemes RoF. Al mateix temps, es proposa i avalua experimentalment una tècnica òptica de linealització del modulador Mach-Zehnder que millora el marge dinàmic del sistema RoF. V AbstractCurrent network and telecommunication systems are required to provide higher data rates in access networks to an increasing number of users. This fact is mainly due to the increase in the Internet traffic data, which is related with the higher demand of online videogames and software, the increased complexity in the content of web pages, the joint distribution of audio-visual and added-value online content, and the introduction of high-definition services and contents such as video on demand, as a result of a society increasingly more interconnected. In order to satisfy these higher data rates requirements, new techniques for the joint distribution of several wireless communication systems are proposed in this Thesis. The aim of these techniques is to facilitate the deployment of an integrated access network at the customer premises, enabling the integration of optical transmission over an optical access network and radio-frequency transmission in the same infrastructure.Two main wireless communication systems are considered in this Thesis, WiMAX (Worldwide Interoperability for Microwave Access) and UWB (Ultra-Wide Band) according to WiMedia Alliance recommendation. Comparing the bit rate and expected range, WiMAX and UWB are complementary radio technologies expected to coexist in a near future in integrated access networks. The optical access network considered in this Thesis can be regarded as a FTTH network (Fibre-to-the-Home). The wireless signals are natively transmitted over optical network, that is, without frequency upconversion and remodulation stages, over one or several optical carriers. This technology, which is known as Radio-over-Fibre (RoF), is well suited for integrated access networks.First, the requirements for...

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Progress in externally modulated AM CATV transmission systems

Cited by 109 publications

References 23 publications

Analogue Microwave Fibre‐Optic Link Design

Analogue Microwave Fibre‐Optic Link Design

Large Signal Analysis of the Michelson Interferometer with Gires-Tournois Interferometers in its Arms

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

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