Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-07-26
1999-01-26
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359119, H04J 1402
Patent
active
058644148
ABSTRACT:
A wavelength division multiplex communication system comprises a head station (2) and a plurality of terminal stations (1) interconnected by an optical fibre cable (3). The head station (2) transmits continuous wave modulated wavelengths (.lambda..sub.1 -.lambda..sub.k), and a signalling wavelength (.lambda..sub.0) which is used to indicate, in each time slot, which wavelengths in the following time slot are available for transmission. Each terminal station (1) is arranged to receive the signalling wavelength, to determine therefrom whether the next time slot contains any data packets for that terminal station and, if so, to receive the packets. The terminal station (1) is arranged, if it has a data packet to transmit, to determine from the signalling wavelength whether the next time slot already contains data packets for the destination station and, if so, to avoid data collision by not transmitting its own data packet. The terminal station (1) then determines a free wavelength (.lambda..sub.q) from the signalling wavelength (.lambda..sub.0), modulates the free wavelength with the data packet it is to transmit, and modifies the signalling wavelength.
REFERENCES:
patent: 4715026 (1987-12-01), Eberspaecher
patent: 5069521 (1991-12-01), Hardwick
patent: 5229875 (1993-07-01), Glista
patent: 5394389 (1995-02-01), Kremer
patent: 5442623 (1995-08-01), Wu
patent: 5539564 (1996-07-01), Kumozaki et al.
patent: 5625478 (1997-04-01), Doerr et al.
Barnsley Peter E.
McGuire Alan
Tsushima Hideaki
Bacares Rafael
British Telecommunications public limited company
Hitachi Limited
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