| 摘要 |
PROBLEM TO BE SOLVED: To provide an article such as a wavelength division multiplexer using a Bragg reflection Mach-Zehnder filter in which dependence on a coupler is reduced. SOLUTION: This Bragg reflection Mach-Zehnder filter 30 includes two plane optical waveguides 12 and 13, and each waveguide 12 and 13 includes interference arms 16 and 17 extended between two connecting areas. Each interference 16 and 17 is provided with a refractive index Bragg diffraction grating 18. This filter receives an optical input signal by one of the waveguides 12 and 13, and outputs a transmission signal transmitted through the Bragg diffraction grating 18 and a reflected signal reflected by the Bragg diffraction grating 18. In this case, the interference arms 16 and 17 introduce a πphase difference to the transmission signal, and the phase difference is not introduced to the reflected signal. |
