Wavelength tuning mechanism

摘要

A Littman configuration type wavelength tuning mechanism comprising an LD block ( 1 ), a grating ( 3 ) and a wavelength adjusting mirror ( 4 ). In the wavelength tuning mechanism, turning means realizing a Littman configuration of said grating with regard to said wavelength adjusting mirror is realized by an armless structure to be turned about the virtual pivot ( 2 - 2 ) of said wavelength adjusting mirror.