| 摘要 |
PURPOSE:To facilitate optical axis adjustments by forming a BPF on two mutually parallel flanks for arraying which have a specific angle to the reference surface of a polygonal prism, and arraying and fixing plural optical fiber collimators mechanically on the flanks for arraying for the reference surface. CONSTITUTION:Light which is propagated in an optical fiber 1a and includes wavelengths lambda1-lambda4 is converted by an optical fiber collimator 12a into parallel luminous flux, which is incident on a BPF3. The BPF3 transmits only light of wavelength lambda1 to an optical fiber collimator 12b while reflecting the remaining light. The reflected light of lambda2, lambda3, and lambda4 is reflected by a mirror 11 to enter a BPF4. The BPF4 transmits only light of wavelength lambda2 to an optical fiber collimator 12c while reflecting the light of other wavelengths. At this time, the pitch P of light reflected repeatedly in a polygonal prism 7 is equal to the pitch D of the optical axes of the respective fiber collimators, so light beams of wavelengths lambda3 and lambda4 are demultiplexed similarly. Thus, optical axis adjustments and assembly are performed through simple operation. |
