Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-07-22
2000-02-08
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, H04B 1008, H04B 1020
Patent
active
060233591
ABSTRACT:
In optical wavelength-division multiplex transmission equipment where a plurality of nodes are connected in the form of a ring, the nodes are connected by four optical fiber transmission lines consisting of a pair of working transmission lines and a pair of protection transmission lines which are capable of bidirectional optical transmission. Four different optical information signals are sent onto four transmission lines by the transmission wavelengths assigned individually to a plurality of nodes, and a desired single wavelength is separated and extracted from the optical signals that are received from the transmission line. The optical signals consisting of the other wavelength components are multiplexed with the aforementioned transmission wavelength and are sent onto the ring-shaped transmission line again. Since a single wavelength component is assigned to each node, there is no need to set protection wavelengths, and all wavelengths can be used as service wavelengths. When an obstacle occurs on the transmission lines, both a clockwise route and a counterclockwise route can be used by switching the working transmission lines to the protection transmission lines at both the transmitting side and the receiving side. In this way, the transmission efficiency and reliability in the optical transmission equipment with a ring structure can be enhanced.
REFERENCES:
patent: 5680235 (1997-10-01), Johansson
patent: 5717796 (1998-02-01), Clendening
patent: 5864414 (1999-01-01), Barnsley et al.
Japanese Office Action dated Aug. 3, 1999, with English language translation of Japanese Examiner's comments.
Japanese Office Action, dated Jun. 1, 1999, with English Language Translation of Japanese Examiner's comments.
Chan Jason
NEC Corporation
Singh Dalzid
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