Method for transferring utility optical signals and...

Optical communications – Diagnostic testing – Test signal

Reexamination Certificate

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C398S003000, C398S005000, C398S012000, C398S019000, C398S020000, C398S030000, C398S031000, C398S033000, C398S045000, C398S050000, C398S056000, C398S082000, C398S135000, C398S139000, C398S140000, C398S141000

Reexamination Certificate

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06947668

ABSTRACT:
The control of the transmission of useful optical signals on different line paths of an optical transmission device is accomplished via at least one of the following features: using signal sources and signal sinks, the useful optical signals are coupled into the line paths, or are coupled out of them; at least one portion of the optical line paths is configured as normal line paths having coupling nodes via which a switchover to an alternative line path can be undertaken if a normal line path is disturbed; in addition to the useful optical signals, test signals, whose evaluation is used for the switchover between the line paths, are transmitted bidirectionally section-by-section; at least two types of test signals can be transmitted, of which a first type is used as an indicator for an intact line path and a second type as an indicator for a disturbed line path; and any switchover to an alternative line path is only undertaken if, before the detection of the disturbance, a test signal of the first type has been transmitted on the normal line path. A decentralized switchover of the line paths is provided and pointless switchovers, which do not lead to any improvements in the transmission, can be avoided.

REFERENCES:
patent: 5663820 (1997-09-01), Shiragaki
patent: 6583898 (2003-06-01), Koeppen et al.
patent: 0 440 276 (1991-08-01), None
patent: 0 721 275 (1996-07-01), None
patent: WO 97 09803 (1997-03-01), None
patent: WO 97 24822 (1997-07-01), None
M. Bischoff et al., “Operation and Maintenance for and All-Optical Transport Network,” IEEE Communications Magazine, vol. 34, No. 11, pp. 136-142 (Nov. 1996).

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