Wavelength reference having repeating spectral features and unique spectral features

A wavelength reference device, comprising:

• a sealed housing comprising a window, the sealed housing comprising a transistor outline package defining an internal environment and;
• a broadband optical source within the internal environment and configured to emit optical power along an optical path, the optical power having a wavelength band;
• a repeating filter within the internal environment and positioned in the optical path and being configured to filter the optical power into a repeating spectral response within the wavelength band, the repeating filter comprising a glass substrate between two mirrors, the glass substrate having a refractive index that varies with a temperature of the internal environment;
• a wavelength-specific filter positioned on the repeating filter and within the internal environment and being configured to attenuate the optical power of at least one predefined wavelength response within the wavelength band;
• and
• a temperature sensor disposed within the internal environment and adapted to provide a temperature signal indicative of the temperature of the internal environment,
• wherein the repeating filter and the wavelength-specific filter output a wavelength reference signal of the optical power having the repeating spectral response attenuated at the at least one predefined wavelength response.