| 摘要 |
The present invention relates to detecting different spectral components of a response signal (S2) received from a device under test -DUT- (12) in response to a stimulus signal (S1), with a first splitter (201) receiving the response signal (S2) and wavelength depending splitting from response signal (S2) a first partial signal (S21) and a second partial signal (S22), a second splitter (202) receiving the second partial signal (S22) and wavelength depending splitting there from a third partial signal (S23), an optical detector (104), for receiving the first partial signal (S21) and the third partial signal (S23) and determining a corresponding optical power, and an optical shutter (203) arranged to be moved to either let through to or block from the optical detector (204) one of: the first partial signal (S21) and the third partial signal (S23).
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