| 摘要 |
PURPOSE:To multiplex and demultiplex an optical signal whose frequency interval is a GHz order by executing an adjustment of optical waveguide length by a wavelength order of light, and also, enlarging a specific refractive index difference of a ring-like optical waveguide, and forming small a cross section shape of its optical waveguide. CONSTITUTION:On first and the second optical waveguides 13, 14 and a ring-like optical waveguide 17 for constituting a Mach-Zehnder interferometer, phase adjustment use electrodes 21, 22 in a phase adjusting means 24 are loaded and a control of the optical waveguide lengths 13, 14 is executed by an order of the optical wavelength. Also, as for a bending loss, comparing with input use optical waveguides 11, 12 and output use optical waveguides 15, 16, a specific refractive index difference of the ring-like optical waveguide 17 is made larger, and also, a cross section shape of the optical waveguide 17 is made smaller, by which the influence of the bending loss can be nearly disregarded. In such a way, an optical signal whose frequency interval is a GHz order can be multiplexed and demultiplexed at a low loss. |
