| 摘要 |
PURPOSE:To easily realize a small-sized optical multiplexer and demultiplexer for wavelength multiplexing of >=3 wavelengths at a low demultiplexing loss and low cost by forming a chirped grating having the grooves of continuously changing spaces in a three-dimensional optical waveguide and juxtaposing plural optical elements along the chirped grating. CONSTITUTION:The light signal of the three wavelengths lambda1-lambda3 (lambda1>lambda2<lambda3) propagating as shown by an arrow 1 in a single mode optical fiber is made incident on the optical waveguide 5. The optical waveguides 5, 5a, 5b are formed on a substrate 6 and the light signal of the wavelengths lambda1-lambda3 propagating in the waveguide 5 is made incident on the chirped grating. Since the period LAMBDAof the grating 7 is different, the light signal of the wavelengths lambda1-lambda3 is strongly reflected in respectively different positions and is multiplexed as shown by arrows 2-4. The groove period LAMBDA of the chirped grating can be realized by the interference of a convergent cylindrical wave 23 and a plane wave 24. |
