Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
1998-05-06
2001-08-21
Pascal, Leslie (Department: 2633)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S199200, C359S199200, C359S199200, C370S412000, C370S428000
Reexamination Certificate
active
06278535
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed toward optical communication systems.
WDM systems are currently being deployed in order to increase the bandwidth or capacity of fiber optic networks. WDM systems typically include a plurality of transmitters, each respectively transmitting signals on a designated one of a plurality of channels or wavelengths. Each transmitter has an associated remodulator, which converts the wavelength of optical signals external to the WDM system to one of the WDM wavelengths. The channels are combined by a multiplexer at one end terminal and transmitted on a single fiber to a demultiplexer at another end terminal where the channels are separated and supplied to respective receivers. Typically, the receivers generate output optical signals corresponding to the optical signals input to the remodulators.
For monitoring purposes, it is advantageous to readily ascertain input and output optical signals associated with a given WDM channel. In WDM systems having low channel counts, e.g., less than 16, it is relatively easy to identify channel assignments. For systems having channel counts in excess of 100, however, it is difficult to trace a given output optical signal from the WDM system to the corresponding channel it was transmitted on because there are a large number of optical signals supplied to and output from the WDM system.
SUMMARY OF THE INVENTION
Consistent with the present invention, a WDM system carrying a plurality of optical signals, each at a respective wavelength, is provided whereby each optical signal includes a plurality of frames, each frame conforming to a synchronous optical network (SONET) standard. A plurality of optical transmitter modules output a corresponding one of the plurality of optical signals, and each of a plurality of optical selectors at a receiving end of the WDM system selects a respective one of the plurality of optical signals. In addition, a plurality of receiver modules are provided respectively connected to each of the optical selectors. Both the transmitter and receiver modules include byte extraction circuitry that extracts one byte, e.g., the J0 byte, from each of the plurality of frames. Successive bytes are grouped as messages, which are stored in registers so that comparisons can be made between consecutive messages and a predetermined message.
The messages can contain any data desired by the user. However, messages including WDM channel identification data are particularly useful in tracing the WDM channel that carried the bytes that constitute the message. Since, according to the present invention, comparisons can be made between successive messages and a predetermined message, the WDM channels can be more effectively monitored and fault locations, whether outside or within the WDM can be readily determined.
REFERENCES:
patent: 4956839 (1990-09-01), Torii et al.
patent: 5383046 (1995-01-01), Hiroaki et al.
patent: 0400959 (1990-12-01), None
patent: 0486874 (1992-05-01), None
patent: 0744845 (1996-11-01), None
patent: 0766421 (1997-04-01), None
patent: 2292872 (1996-03-01), None
patent: 05110584 (1993-04-01), None
Okamoto, S., et al.: “Inter-Network Interface for Photonic Transport Networks and SDH Transport Networks”, Global Telecommunications Conference, US, New York, IEEE, pp. 850-855.
Ciena Corporation
Pascal Leslie
Sedighian M. R.
Soltz David L.
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