| 摘要 |
PROBLEM TO BE SOLVED: To make a transmission and receptor module small-size and low-cost by combining a dielectric multi-layered film filter and a beam splitter with each other and storing the dielectric multi-layered film filter and the transmission and reception module in the same housing. SOLUTION: Light signals with wavelengths λ1 and λ2 which are inputted from a common optical fiber terminal 11 are branched and filtered by the dielectric multi-layered film filter 12, and the light signal with the wavelength λ1, which passes through this filter 12, is led to an output optical fiber terminal 13 and the light signal with wavelength λ2, which is reflected by the filter 12, is inputted to a light receiving element 15 through a beam splitter 14. A light signal with wavelength λ2, which is outputted from a light emitting element 16, is passed through the beam splitter 14 and dielectric multi-layered film filter 12, sent out of the common optical fiber terminal 11, and transmitted in two ways on a time-division basis. Here, the dielectric multi-layered film filter 12 and beam splitter 14 are formed on a transparent glass substrate and adhered and fixed to projection parts 23 formed in the housing 22. |
