Optical switch, optical modulator and variable wavelength filter
A technology of optical modulator and optical switch, which is applied in the direction of light guide, optics, instruments, etc., can solve the problem of high power supply price
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Embodiment approach 1
[0091] The optical switch of Embodiment 1 has an optical waveguide through which light propagates, and electrodes for applying an electric field to the optical waveguide. Dielectric crystals having cubic crystals such as KTN and KLTN crystals and having a large secondary electro-optic effect are used as the optical waveguide.
[0092] As a specific configuration, there is a Mach-Zehnder interferometer type optical switch capable of switching with a small change in refractive index, that is, capable of switching at a low driving voltage. In order to perform polarization-independent operation in this optical switch, it is necessary that the refractive index changes due to the secondary electro-optic effect be exactly equal in the TE direction and the TM direction. In the KTN and KLTN crystals used in this embodiment, the refractive index changes in the TE direction and the TM direction have an equal electric field orientation in principle. That is, by configuring electrodes tha...
Embodiment 1
[0096] figure 1 It is a configuration diagram showing an example of an optical switch according to an embodiment of the present invention. The optical switch has a Mach-Zehnder interferometer. The optical waveguide of the optical switch is made of dielectric crystal. In addition, in other examples of this embodiment, it is also possible to have figure 1 The illustration is based on the optical switch of the Mach-Zehnder interferometer shown.
[0097] like figure 1 Shown, the optical switch of the present invention is to comprise the 3dB coupler 16 that is arranged on the input side, the 3dB coupler 17 that is arranged on the output side, 2 optical waveguides that connect the input side 3dB coupler 16 and the output side 3dB coupler 17 A Mach-Zehnder interferometer composed of branch waveguides). In addition, an electrode for applying an electric field to one of the two optical waveguides is provided as the phase adjustment unit 18 . In addition, the coupling constants of...
Embodiment 2
[0114] The structure of the optical switch of the present embodiment is that one side of the optical waveguide (branch waveguide) of the Mach-Zehnder interferometer is provided with figure 2 The phase modulation unit 24 of the phase modulation section 18 is shown, and the phase modulation unit 25 of the phase modulation section 8 is provided on the other side. Other configurations are substantially the same as those of the optical switch of the first embodiment. In this example, an optical switch having such a structure was produced and its operation was confirmed.
[0115] In the structure of the optical switch of the first embodiment, since the electric field is applied only to the branch waveguide of one side of the Mach-Zehnder interferometer, the change of the refractive index is the addition of equations (1) and (2). As explained in Example 1, the 2nd order electro-optic constants of KTN and KLTN crystals have opposite signs in the orthogonal direction. Therefore, alt...
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