Abstract
First of all, in this paper, we situate and recall the advantage of single mode fiber for transmission of a multichannel AM-VSB TV signal. Then we describe the prototype of a multichannel transmission system studied under a France Télécom contract and discuss the experimental results obtained on this system. Today the equipment issued from that study, is in current industrial development in order to be soon installed in networks. A few rules are given in terms of range, number of channels per fiber and number of subscribers to help the design of networks. After having identified the system limitations, solutions are proposed to improve the performances. Particularly the concept of a am-vsb optical repeater and the linearity improvement with that procedure are shown. We will also discuss the use of 1.54 μm dfb laser and compare the performances at both wavelengths. The interest of predistortion network to escape from the previously identified linearity constraint is justified. Then the extension of transport network to optical distribution network closer to the subscriber (fttc) is envisaged. We show how the trade-off between less stringent performances and higher distribution potentiality can be handled. At last the interest of external modulation in order to escape from the noise limitation and to extend the coverage of the network at both wavelengths is discussed.
Résumé
L’article rappelle tout d’abord les avantages apportés par l’utilisation de la fibre optique unimodale dans les réseaux de transport et de distribution d’un multiplex fré quentiel de signaux de té lé vision modulés en amplitude à bande latérale résiduelle (ma/blr), puis décrit et présente les résultats expérimentaux obtenus sur un système de transmission optique multicanaux utilisant une diode laser (dfb) à 1,3 μm étudié et ré alisé dans le cadre d’un contrat d’é tude France Té lé com. Des solutions sont proposées pour amé liorer les performances en liné arité du réseau optique. L’inté rêt de la modulation optique externe pour la ré alisation de ce type de ré seau MA/BIR est é galement abordé.
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Richard, C.J., Hergault, S., Hardy, P. et al. Transmission and distribution of a multichannel AM-VSB TV signal on a single mode optical fiber for CATV videocommunication networks. Ann. Télécommun. 49, 527–542 (1994). https://doi.org/10.1007/BF02999444
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DOI: https://doi.org/10.1007/BF02999444
Key words
- CATV network
- Frequency division multiplexing
- Amplitude modulation
- Vestigial sideband
- Optical telecommunication
- Optical fiber transmission
- Single mode optical fiber
- Prototype
- Experimental results
- Transmission characteristic
- Optical transmitter
- Optical receiver