| 摘要 |
An optical frequency synthesizer controls a tunable laser to output signals having specific wavelengths. The synthesizer includes a wavelength discriminating device, a wavelength tuning device and a phase locked loop (PLL) circuit. The wavelength discriminating device receives a sample of the signals outputted by the tunable laser, processes the sample signals and passes the processed sample signals to the PLL circuit. Based on the process ed sample signals, the PLL circuit controls the wavelength tuning device to tun e the laser to output the signals having specific wavelengths.
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