| 摘要 |
PURPOSE:To reduce considerably the number of parts of an optical multiplexer/ demultiplexer, to improve the processability and to reduce considerably the unit price of parts by producing glass blocks in accordance with the number of wavelengths to be demultiplexed or multiplexed. CONSTITUTION:Interference film filters 11-14 for reflection which reflect wavelengths lambda1-lambda4 or permit them to transmit through respectively are stuck or vapor-deposited to one surface of blocks 10 and 9. The optical signal lambda1 out of optical signals lambda1-lambda4 incident from an input port 1 is reflected on the interference film filter 11 for lambda1 reflection and is transmitted to the first port 2. The other optical signals lambda2-lambda4 are transmitted through the interference film filter 11, and the optical signal lambda2 out of transmitted optical signals lambda2-lambda4 is reflected on the interference film filter 12 for lambda2 reflection and is transmitted to the second port 3. The outer optical signals lambda3 and lambda4 are transmitted through the interference film filter 12 and are reflected on interference film filters 13 and 14 similarly and are transmitted to the third port 7 and the fourth port 8 respectively, and thus, all optical signals lambda1-lambda4 are demultiplexed. They are multiplexed through the reverse course. |
