| 摘要 |
A signal source (10) has a cascaded Raman resonator type arrangement with a seed signal being used to control the spectral output of the source. A plurality of Stokes orders are generated in a gain medium (12), with the highest Stokes order being allowed to exit. The seed signal is provided to t he gain medium by a seed source (28), and is within the wavelength range of the highest Stokes order. The seed signal stimulates Raman-shifted gain in the wavelength range of the seed signal, thereby allowing the output wavelength range of the gain medium to be controlled. In one embodiment, the seed signa l is a broadband signal that results in a broadband output from the gain mediu m. In another embodiment, the seed signal is provided by a number of narrowband sources coupled together before being introduced to the gain medium. The see d source may be adjusted to adjust the spectral power distribution of the outp ut from the signal source. Adjustment may be done in combination with active signal monitoring of the signal source output. Alternatively, the signal source may be used to pump a gain medium in which a desired signal is amplified, and the spectral power distribution of the desired signal may be monitored for making seed source adjustments.
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