FBG reflected spectrum
Hello, why FBG keeps reflecting a part of the transmitted spectrum (which is supposed to be transmitted and not to appear in the reflected spectrum) when use it with CW laser? For example, in the case of CW wavelength is 1550 nm, and the FBG reference wavelength is 1551nm, the reflected spectrum from the FBG displayed in the OSA contains both of 1550 and 1551 in the same spectrum, what ever the FBG bandwidth is.
. Thank you
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