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AssigneeFurukawa Electric Co., Ltd.
InventorsJunichi Hasegawa, Kazutaka Nara
Estimating the term…
In a method of phase adjustment for the demodulator 1 of the present invention, the phase adjustment is performed by driving any one of the heaters on the two waveguides 10 and 11 in the Mach-Zehnder interferometer (MZI) 6 and on the two waveguides 14 and 15 in the MZI 7. In case that an initial phase difference between the MZIs 6 and 7 smaller than a required phase difference as π/2 therebetween, the heaters C and D are driven, that are formed on the first waveguide 10 in the MZI 6, and the heaters G and H are driven, that are formed on the second waveguide 15 in the MZI 7. In case that 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.
A delay-line demodulator comprising:
A method of adjusting a phase shift in a delay-line demodulator in which a first 2×2 Mach-Zehnder interferometer and a second 2×2 Mach-Zehnder interferometer are connected to two waveguides branched from an optical input waveguide respectively, at least one heater is formed on each of two waveguides having different waveguide length and forming the first Mach-Zehnder interferometer, and at least one heater is formed on each of two waveguides having different waveguide length and forming the second Mach-Zehnder interferometer, the method comprising:
Dependencies are inferred from the claim text.