| 摘要 |
Systems and methods for monitoring wavelength in wavelength division multiplexed systems. A thin film filter is used with a pair of photodiodes to monitor the emitted wavelength of a laser. The thin film filter is configured to both reflect and transmit light equally at a particular wavelength of interest. The ratio between the optical power of the transmitted light and optical power of the reflected light can be used to detect wavelength drift. When the laser is drifting or is no longer emitting at the target wavelength, the wavelength locker can automatically adjust a temperature of the laser. Adjusting the temperature of the laser can change the emitted wavelength of the laser such that the emitted wavelength matches a target wavelength.
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