CWDM optical module with parallel branch structure of thin-film filter type channel devices

摘要

A CWDM(Coarse Wavelength Division Multiplexing) optical module with a multiple parallel arrangement structure of thin film filter type channel elements is provided to relieve specifications of a band split filter by applying the band split filter after excluding several non-used channels positioned around the center of a wavelength, thereby economically producing the band split filter. In an 8-channel CWDM optical module with a multiple parallel arrangement structure of thin film filter type channel element, a band split filter(102) separates first, second, and third channels and sixth, seventh, and eighth channels. Fourth and fifth channels that do not correspond to band splitting of the band split filter are excluded. In particular, the band split filter separates bands(103,104,105) of 1470~1510nm and bands(106,107,108) of 1570~1610nm. Bands(109,110) of 1530~1550nm are excluded.