Nippon Telegraph and Telephone Corporation

Koji Enbutsu

Takashi Kurihara

Seiji Toyoda

Tadayuki Imai

Kazuo Fujiura

Masahiro Sasaura

Saburo Imamura

Satoru Tomaru

Makoto Abe

Shogo Yagi

Shoichi Hayashida

Tohru Maruno

Akiyuki Tate

Eishi Kubota

Makoto Shimokozono

Hiroshi Fushimi

Touru Matsuura

Michiyuki Amano

Makoto Hikita

Shun-ichi Tohno

The present invention provides an optical switch, an optical modulator, and a wavelength variable filter each of which has a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch according to the present invention includes a 3-dB coupler () placed on an input, a 3-dB coupler () placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section () that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaNbO(0&#x3c;x&#x3c;1) and KLiTaNbO(0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1), or KTaNbOor KLiTaNbO.

Optical switch, optical modulator and wavelength variable filter

A photosensitive composition for optical waveguides comprising of an organic oligomer, a polymerization initiator and a crosslinking agent, the organic oligomer being a silicone oligomer represented by the following formula (1), wherein X denotes hydrogen, deuterium, halogen, an alkyl group or an alkoxy group; m is an integer from 1 to 5; x and y represent the proportion of respective units, and neither x nor y is 0; and Rdenotes a methyl, ethyl, or isopropyl group; a production method thereof, and a polymer optical waveguide pattern formation method using the same 

Photosensitive composition for manufacturing optical waveguide, production method thereof and polymer optical waveguide pattern formation method using the same

An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaNbO(0&#x3c;x&#x3c;1) and KLiTaNbO(0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1), or KTaNbOor KLiTaNbO.

An optical waveguide capable of having various characteristics and a method of manufacture thereof as well as a method of manufacturing a crystal film are provided. An optical functional material KTaNbOis used as an optical waveguide. The input optical signal is transmitted to the KTaNbOfilm. The KTaNbOfilm undergoes changes in optical property when an external voltage signal is applied to the electrode. Therefore, as it passes through the KTaNbOfilm, the input optical signal is modulated by the characteristic change. The modulated optical signal is taken out as an output optical signal.

Optical waveguide and method of manufacture

A photosensitive composition for optical waveguides comprising of an organic oligomer, a polymerization initiator and a crosslinking agent, the organic oligomer being a silicone oligomer represented by the following formula (1), wherein X denotes hydrogen, deuterium, halogen, an alkyl group or an alkoxy group; m is an integer from 1 to 5; x and y represent the proportion of respective units, and neither x nor y is 0; and Rdenotes a methyl, ethyl, or isopropyl group; a production method thereof, and a polymer optical waveguide pattern formation method using the same.

A photosensitive composition for optical waveguides comprising of an organic oligomer, a polymerization initiator and a crosslinking agent, the organic oligomer being a silicone oligomer represented by the following formula (1), wherein X denotes hydrogen, deuterium, halogen, an alkyl group or an alkoxy group; m is an integer from 1 to 5; x and y represent the proportion of respective units, and neither x nor y is 0; and R denotes a methyl, ethyl, or isopropyl group; a production method thereof, and a polymer optical waveguide pattern formation method using the same.

A wavelength converter implements high speed, high efficiency, low noise wavelength conversion without performing high voltage poling of a crystal, and enables switching and modulation of converted light in response to an electric field. A KLTN crystal, includes a deposited-gold electrode within its incidence plane, and is connected to a DC power supply via a copper wire. The crystal material is composed of KTa Nb O and/or K Li Ta Nb O . A polarizer controls the polarization of the fundamental wave in the direction parallel to the electric field, and launches it into the electrode of the KLTN crystal. The KLTN crystal, rotating on an axis in the direction of the electric field, launches only part of the generated SHG light with the same polarization direction as that of the incident light into a photo multiplier tube through a polarizer.

Wavelength converter

An optical waveguide capable of having various characteristics and a method of manufacture thereof as well as a method of manufacturing a crystal film are provided. An optical functional material KTa Nb O is used as an optical waveguide. The input optical signal is transmitted to the KTa Nb O film. The KTa Nb O film undergoes changes in optical property when an external voltage signal is applied to the electrode. Therefore, as it passes through the KTa Nb O film, the input optical signal is modulated by the characteristic change. The modulated optical signal is taken out as an output optical signal.

Optical waveguide device for optical wiring and manufacturing method therefor

An optical waveguide device has connectors connecting in a non-alignment fashion to an optical fiber via guide pins and a polymeric waveguide with a film shaped waveguide. Both ends or one end of the polymeric waveguide are/is connected to the connectors. The polymeric waveguide is sandwiched between the connector parts and this configuration permits easy connection with optical fibers, optical devices, planar optical waveguides and the like with a high degree of accuracy.

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Atsugi, Japan

Koji Enbutsu