A DUAL BAND CWDM PASS FILTER MODULE MADE BY THE COMPLEX OF SINGLE BAND CWDM PASS FILTERS

摘要

The present invention is implemented by combining easily available three-port single-band CWDM pass filters or four-port single-band CWDM pass filters, and is implemented using various single-band CWDM pass filters that can freely combine two desired wavelengths. A dual-band CWDM pass filter module implemented with a plurality of three-port single-band CWDM pass filters according to the present invention, has an input port, a pass port and a reflection port, and has a predetermined first wavelength a first three-port single-band CWDM pass filter having a first filter chip that passes only light of (λ1); Installed so that the pass port is connected to the reflection port of the first three-port single-band CWDM pass filter that passes the light of the first wavelength (λ1) and the reflection port is connected to the pass port of the first three-port single-band CWDM pass filter and a second three-port single-band CWDM pass filter having a second filter chip that passes only light of a predetermined second wavelength (λ2) and reflects the light of the first wavelength (λ1) to be emitted to the input port; .