OPTICAL ELEMENT AND OPTICAL CIRCUIT

WIPO Patent Application WO/2019/013320

A1

[Problem] To provide an optical element and an optical circuit enabling easy integration. [Solution] An optical element has a quarter-wave plate formed on the X-Y plane and laminated in the Z-axis direction in three-dimensional space X, Y, Z. The groove in the wave plate is curved, and the angle relative to the Y-axis varies continuously in the range of 0° to 180°. The optical element separates and converts incoming circularly polarized light into light passing therethrough and circularly polarized light reversely rotating a given angle toward the X axis from the Z axis, and outputs the light. A plurality of elements comprising multi-area half-wave plates and elements comprising the multi-area quarter-wave plates are disposed at suitable positions; polarization separation is performed on incoming signal light and local oscillator light and each light is separated into two parts; the phase of twin beams in the separated light is shifted by 90° relative to the other beams of light; and finally the light is synthesized with the multi-area quarter-wave plate according to the present invention. Thereby, it is possible to create an optical circuit having functions of polarization separation and 90° hybrid.

JP2002372627	OPTICAL FILM AND PROJECTOR
WO/2015/087789	POLARIZING PLATE
JP7114665	Polarizing plate with retardation layer and image display device using the same

KAWASHIMA TAKAYUKI (JP)
KAWAKAMI SHOJIRO (JP)
IJIRO TOSHIKAZU (JP)
CHIBA TAKAFUMI (JP)

PCT/JP2018/026469

January 17, 2019

July 13, 2018

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AUTOCLONING TECH CO LTD (JP)
PHOTONIC LATTICE INC (JP)

G02B5/30

JP2012181385A	2012-09-20
JP2017072526A	2017-04-13
JP2016519327A	2016-06-30

HIROSE Takayuki (JP)

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