| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a delay demodulating device which has an extremely small separation amount, and to provide a phase adjusting method thereof. <P>SOLUTION: In the phase adjusting method of the demodulating device 1, phase adjustments of Mach-Zehnder interferometer circuits (MZI) 6 and 7 are made by driving any of heaters on two waveguides 10 and 11 in the Mach-Zehnder interferometers 6 and 7. When an initial phase difference between the MZIs 6 and 7 smaller than a required phase difference (π/2) therebetween, the heaters C and D formed on the first waveguide 10 in the MZI 6 and the heaters G and H formed on the second waveguide 15 in the MZI 7 are driven. When the initial phase difference is larger than the required phase difference (π/2) therebetween, the heaters A and B formed on the second waveguide 11 in the MZI 6, and the heaters E and F formed on the first waveguide 14 in the MZI 7 are driven. <P>COPYRIGHT: (C)2009,JPO&INPIT |
