WAVELENGTH-LOCKING A RING-RESONATOR FILTER

摘要

In an optical device, a ring resonator, having a resonance wavelength, optically couples an optical signal that includes a wavelength from an input optical waveguide to an output optical waveguide. A monitoring mechanism in the optical device, which is optically coupled to the output optical waveguide, monitors an output optical signal on the output optical waveguide. For example, the monitoring mechanism may dither a temperature of the ring resonator at a frequency using a heater, and the output optical signal may be monitored by determining amplitude and phase information of the output optical signal at the frequency and twice the frequency. Moreover, control logic in the optical device adjusts the resonance wavelength based on the monitored output optical signal, where the adjustment is made without monitoring an input optical signal on the input optical waveguide.

主权项

1. An optical device, comprising:
an input optical waveguide configured to convey an input optical signal that includes multiple wavelengths; a ring resonator, having a resonance wavelength, optically coupled to the input optical waveguide; an output optical waveguide configured to convey an output optical signal that includes a wavelength in the multiple wavelengths; a monitoring mechanism, optically coupled to the output optical waveguide, configured to monitor the output optical signal; and control logic configured to adjust the resonance wavelength based on the monitored output optical signal, wherein the adjustment is made without monitoring the input optical signal.