| 摘要 |
PURPOSE:To simplify the electrode constitution by using a 3dB coupler for an input side and an output side, allowing the signal light to branch and outputting it, and executing the mode conversion corresponding to the wave length of the signal light by a mode converter. CONSTITUTION:When the signal light of multiplexed wavelength is inputted from an input port 24 or 26, it is brought to the waveguide to output ports 28, 30 in a state that it is separated to a TM mode and a TE mode. This signal light comes to a state of one of an even mode and an odd mode by a first element 40 and is inputted to an element 42. The signal light is allowed to branch by equal optical power and phase by the element 42, and by mode converters 34, 36, only the signal light having separated wavelength is brought to mode conversion corresponding to its wavelength. Subsequently, by an element 44, the signal light from the converters 34, 36 is joined, passes through an ele ment 46, and a signal of the odd mode, and a signal of the even mode are outputted from the output port 30 and the output port 28, respectively. In such a way, the optical wavelength filter whose electrode constitution is simple is obtained. |
