| 摘要 |
PROBLEM TO BE SOLVED: To realize a short wave optical transmitter-receiver which is usable in an optical fiber having a single transmission mode in a long wavelength region. SOLUTION: An optical transmitter-receiver furnished with a mode cut filter which is composed by connecting an optical fiber or an optical waveguide having a single transmission mode for a long wavelength (wavelength is 1.2 to 1.7 μm) and an optical fiber or an optical waveguide having a single transmission mode for short wavelength (wavelength is 0.6 to 1.0 μm) is provided. With this composition, a high order mode which is generated when a short wavelength light is transmitted in the optical cable having a single transmission mode for long wavelength is eliminated, thus a wide band transmission is performed by using an inexpensive short wavelength optical transmitter-receiver. |
