Wavelength monitor and optical module
AssigneeMitsubishi Electric Corporation
InventorKeita Mochizuki
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Abstract
A wavelength monitor monitors wavelengths of laser beams emitted from a laser source and transmitted through a collimating lens. The wavelength monitor comprises an etalon that serves as an optical filter, and an optical detector. The etalon has a transmittance that is periodic with respect to a frequency, and is disposed such that a pair of collimated beams, emitted through a pair of emitting ports of the laser source and then transmitted through the collimating lens, is incident on the optical filter at symmetrically positive and negative angles. The optical detector receives the pair of collimated beams transmitted through the etalon, and detects the intensities of the pair of collimated beams.
Claims11
A wavelength monitor that monitors wavelengths of laser light beams emitted from a laser source and transmitted through a collimating lens, the wavelength monitor comprising:
- an optical filter comprising a transmittance that is periodic with respect to frequencies, the optical filter being disposed such that a pair of same-wavelength collimated beams, emitted through a pair of emitting ports of the laser source and then transmitted through the collimating lens, is incident on the optical filter at symmetrically positive and negative angles;
- and
- an optical detector that receives the pair of collimated beams transmitted through the optical filter and detects the intensities of the pair of collimated beams.
Dependencies are inferred from the claim text.