| 摘要 |
A first optical signal source (104) produces a first optical signal that has wav elength .lambda.1, and a second optical signal source (106) produces a second optical signal that has wavelenght .lambda.2. A first WDM coup ler (116) is connected to the first and second optical signal sources (104, 106) to combine signals output therefrom. An optical fiber (118) i s connected to the WDM coupler (116) to guide the combined optical signals therefrom. A second WDM coupler (130) is connected to t he optical fiber (118) to separate the optical signal of wavelength .lambda.1 and .lambda.2. A fiber optic sensor array (128) containing a plurality of fiber optic sensors (134, 138) is connected to the second WDM coupler (130) and arranged such that the optical signals of wavelengths .lam bda.1 and .lambda.2 are directed to different fiber optic sensors (134, 138) in the fiber optic sensor array (128). A third WDM coupler (142) is arrange d for combining signals of wavelength .lambda.1 and .lambda.2 output from the fiber optic sensor array (128).
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