| 摘要 |
A device for providing a reference wavelength which is used in monitoring the performance of a WDM optical transmission system which includes a light emitting diode (LED) generating light in a predetermined wavelength band, a filter receiving the light from the LED and filtering an optical signal at a predetermined reference wavelength, a tap coupler extracting a portion of the optical transmission data, a coupler coupling the output of the tap coupler with the output of the filter, a sawtooth wave generator generating sawtooth waves in a voltage range which includes the reference wavelength and the different wavelengths of the optical transmission light, and a variable optical filter receiving the output of the coupler and the sawtooth waves and filtering the output of the coupler where the sawtooth waves overlap.
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