| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical filter capable of reducing polarization dependent loss and reducing the polarization dependence even near an edge wavelength in the wavelength characteristic, and to provide a wavelength multiplexed light coupler using an optical filter which has high isolation and is small in size and inexpensive. SOLUTION: The wavelength multiplexed light coupler 1 is provided with a first lens 31 which turns incident light from an optical fiber 23 for incident light into parallel light, a first optical filter 41 which is arranged on the second surface 31b side of the first lens 31 and reflects light of wavelengthλ1, an optical fiber 24 for outgoing light which is arranged on a position where light reflected on the optical fiber 41 outgoes from a first surface 31a and is condensed, and a second optical filter 43 which is arranged between the optical fiber 24 and the first surface 31a, transmits light of wavelengthλ1 and reflects light besides the same. The optical filter 43 is a dielectric multilayer in which each optical film thickness of a high refractive index dielectric film and a low refractive index film is set to be 3λ/4. COPYRIGHT: (C)2006,JPO&NCIPI |
