| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for monitoring an extinction ratio (ER) of optical signals. SOLUTION: The apparatus 500 for monitoring an extinction ratio (ER) of optical signals and a method therefor are provided with an optical spectrum analyzing unit 510, an ER monitoring control unit 520 and an ER monitoring output unit 530. The optical spectrum analyzing unit 510 measures two peak values, i.e., values for level "1" and level "0" of optical signals from an optical coupler 501, and obtains optical wavelengths for the two peak values. The ER monitoring output unit 530 outputs the difference of the two optical wavelengths for the two peak values to the ER monitoring control unit 520. With a relation formula of the difference of the optical wavelengths, the ER monitoring control unit 520 computes an optimal analysis bandwidth for setting up the optical spectrum analyzing unit 510. As such, the optical spectrum analyzing unit 510 measures two optical powers for the level "1" and level "0" of optical signals, and the ER monitoring output unit 530 computes an ER value of the optical signals from the two optical powers. COPYRIGHT: (C)2010,JPO&INPIT
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