OSNR monitoring method and apparatus for the optical networks

Details OSNR monitoring method and apparatus for the optical networks OSNR monitoring method and apparatus for the optical networks

2007-02-13

2007-02-13

Phan, Hanh (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S025000, C398S027000, C398S033000, C398S038000, C398S034000, C398S037000, C398S140000, C398S141000, C398S147000, C398S148000, C398S158000, C398S159000, C398S160000, C398S208000, C398S209000, C398S214000, C398S094000, C398S152000

Reexamination Certificate

active

10148438

ABSTRACT:
It is disclosed that a method and apparatus that automatically monitors each channel's optical signal-to-noise ration (OSNR) using optical filter and polarization extinction method in wavelength division multiplexing (WDM) scheme-based optical transmission systems. OSNR is simply measured using optical filter by comparing amplified spontaneous emission (ASE) over the signal band, of which bandwidth has changed, while leaving signal intensity intact, with that original signal and, OSNR measurement is allowable over a wider range of OSNR by minimizing the ratio of signal to ASE over the signal band using polarization extinction method.

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