WAVELENGTH LOCKING FILTER

摘要

An optical system can automatically lock an adjustable spectral filter to a first wavelength of an incoming light signal, and can automatically filter an additional incoming light signal at the first wavelength. A tunable filter can have a filtering spectrum with an adjustable peak wavelength and increasing attenuation at wavelengths away from the adjustable peak wavelength. The tunable filter can receive first input light, having a first wavelength, and can spectrally filter the first input light to form first output light. A detector can detect at least a fraction of the first output light. Circuitry coupled to the detector and the tunable filter can tune the tunable filter to maximize a signal from the detector and thereby adjust the peak wavelength to match the first wavelength. The tunable filter further can receive second input light and spectrally filter the second input light at the first wavelength.

主权项

1. An optical system, comprising:
a tunable filter having a filtering spectrum with an adjustable peak wavelength and increasing attenuation at wavelengths away from the adjustable peak wavelength, the tunable filter configured to receive first input light, having a first wavelength, and spectrally filter the first input light to form first output light; a detector configured to detect at least a fraction of the first output light; and circuitry coupled to the detector and the tunable filter, the circuitry being configured to tune the tunable filter to maximize a signal from the detector and adjust the peak wavelength to match the first wavelength, the tunable filter further configured to receive second input light and spectrally filter the second input light to form second output light, the second output light being spectrally filtered with a peak at the first wavelength and increasing attenuation at wavelengths away from the first wavelength.