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Ultra-wideband Coherent Optical LANs by S. Forcesi (auth.), S. Forcesi (eds.)

By S. Forcesi (auth.), S. Forcesi (eds.)

The content material of this booklet is the results of the paintings and the reviews of an interdisciplinary and strictly ecu workforce of researchers who've tried to offer beginning to a brand new fibre verbal exchange community idea via exploiting the aptitude merits of optical coherent transmission. The run in the direction of this formidable aim begun in 1985 at the foundation of the ESPRIT application incentives by means of an "ad hoc" consortium of business companions and examine associations. the 1st 3 years have been devoted to a feasibility examine conducted by way of a discounted variety of "pioneers". In 1989 the workforce was once prolonged to 11 companions. there has been already transparent proof of the expanding curiosity in Europe in exploring the particular limits of optical fibre coherent platforms; the venture had cutting edge and extremely complex positive factors that have been progressively sophisticated by way of incorporating the most recent technological advancements to which it has at once contributed. the most aim of the undertaking particular the advance of the required development blocks to teach experimentally the functionality and the pliability outfitted into the proposed suggestion of multi-channel ultra-wideband community. The process thought built inside this venture affiliates optical frequency department multiplexing with an appropriate community structure and administration options to permit very excessive flexibility and potency in dealing with simultaneous transmission over the community (on every one optical frequency) of a number of digital channels every one working with a variety of details charges starting from a fragment of a Mb/s as much as a greatest worth in way over one hundred sixty Mb/s.

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The diode facet facing the external cavity is AR-coated to achieve a single cavity. 6 GHz is obtained for a cavity length of about 4 cm. Discontinuous tuning of the laser over a range of about 100 nm is possible by changing the angle of the grating. For continuous tuning, over about 50 GHz, the tilting of the grating is accompanied by a proper change of the cavity length. The resolving power of the grating is determined by the number of illuminated grooves, and can be changed either by changing the grating type or the dimension of the intra-cavity beam.

Besides the generation of an optical frequency comb, experiments on locking of a tunable laser to the reference comb have been performed. The optical outpu~ of a tunable laser and the comb generator were combined on a photodiode by means of a fibre coupler; an AFC, having a 300 MHz zero-crossing, was used for frequency locking the tunable laser relative to one of the comb lines. During the tuning of the entire comb over a frequency range of about 40 GHz, locking relative to the distinct comb lines remained stable.

14 - Information cells path during a connection between UAUs X and Y - LANs interconnection - Distributed Processing Systems. The application scenarios for CL data services are shown in Fig. 15, illustrating UCOL capability of interconnecting LANs and TEs. UCOL provides network access to the users by means of dedicated interfaces (UAUs); these can be built with gateway or bridge functions, allowing interconnection of heterogeneous and homogeneous LANs respectively. g. DECNET, XNS, TCPIIP) and UCOL own protocol.

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