Apparatus for monitoring optical signal-to-noise ratio

Details Apparatus for monitoring optical signal-to-noise ratio Apparatus for monitoring optical signal-to-noise ratio

2007-08-14

2007-08-14

Sedighian, M. R. (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S152000

Reexamination Certificate

active

10724072

ABSTRACT:
Disclosed is an apparatus for monitoring an optical signal-to-noise ratio in a WDM optical network. The apparatus includes an orthogonal polarization component module for receiving an optical signal and outputting it after removing a signal component thereof at a specific frequency band; and calculation means for measuring both average signal and noise component intensity of the optical signal outputted from the orthogonal polarization component module. By removing a signal component at a specific frequency bandwidth and passing only a noise component through, it is possible to easily measure the noise intensity within a signal bandwidth that cannot be measured in general. A frequency band is set within a signal bandwidth, and the signal intensity is minimized at the set frequency band, so that it is possible to measure the optical signal-to-noise ratio even for a signal whose amplified spontaneous emission noise spectrum is not flat, irrespective of the signal pattern length.

REFERENCES:
patent: 5986782 (1999-11-01), Alexander et al.
patent: 6433864 (2002-08-01), Chung et al.
patent: 6813021 (2004-11-01), Chung et al.

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