Calibrated Fabry-Perot etalon as 1.5-μm wavelength region absolute frequency reference based on double acetylene absorption

Absolute frequency reference in 1.5-mu m wavelength region is very useful for DWDM system. We have studied on producing artificial 1.5-mu m wavelength region absolute frequency reference by calibrating the F-P etalon. Double acetylene absorption line calibrating technique was adopted. An experiment of calibrating the Fabry-Perot etalon using double acetylene absorption lines has been demonstrated. In the experiment, Mode 1996 of the F-P etalon was locked to acetylene absorption line 1533.4621 nm. The frequency stability of the calibrated F-P etalon was about 7 X 10(-8). After calibrating, a series of artificial absolute frequency references in 1.5- mu m wavelength region was obtained. To reduce the complexity of calibrating, a novel frequency difference measurement method was introduced.