Raman amplifier with raised gain resulted from wave-filtering and optical transmission system
A Raman amplifier and optical filter technology, applied in transmission systems, electromagnetic wave transmission systems, optical multiplexing systems, etc., can solve the problems of optical signal loss, excitation signal loss, etc.
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Embodiment 60
[0078] Figure 12 An embodiment 60 of the present invention is illustrated that utilizes a "mid-section" isolator that includes a high pass filter. As shown, the signal S is input to the first circulator 62 and the excitation signal P is input to the second circulator 64 . Between the first length of fiber 68 and the second length of fiber 70 is provided a mid-section isolator 66, as shown, where the isolator 66 allows reverse propagating excitation by utilizing a pair of wavelength division multiplexers 76 and 78. Signal P and signal S pass through two independent paths 72 and 74 . An optical isolator 80 is added in path 72 associated with signal S to prevent reflected portions of signal S, and optical noise, from propagating in the opposite direction. By using separate paths for the signal S and the excitation signal P, the excitation signal P is not attenuated by the isolation 80 . This isolation allows for more efficient signal amplification in the first length of fiber...
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