National Institute of Advanced Industrial Science and Technology

Hitachi Cable, Inc.

Keio University

Toshifumi Hasama

Hisato Uetsuka

Masahiko Mori

Hiroshi Ishikawa

Hiroyuki Tsuda

Hitoshi Kawashima

Kenji Kintaka

Keisuke Sorimoto

To provide a waveguide type wavelength domain optical switch which makes it possible to use a cheap lens, makes it possible to correct aberration of the demultiplexed wavelengths produced in a plurality of waveguide type demultiplexing circuits, a wavelength domain optical switch is provided with: an integrated element formed by laminating three or more waveguide type demultiplexing circuits; a first lens for collecting light emitted from the integrated element; a polarization separation element for separating light emitted from the first lens into X polarization and Y polarization and emitting the X polarization and the Y polarization at different angles; a second lens for collecting the X polarization and the Y polarization; a first reflective optical phase modulator for reflecting the collected X polarization and Y polarization at any angles; a &#xbd;-wavelength plate disposed between the second lens and the first reflective optical phase modulator in order to make polarization directions of the X polarization and the Y polarization identical; and a second reflective optical phase modulator for inputting light from the first reflective optical phase modulator into one of the waveguide type demultiplexing circuits.

Wavelength domain optical switch

An optical waveguide-type wavelength domain switch includes a waveguide-type multi/demultiplexing device laminate comprising three or more laminated waveguide-type multi/demultiplexing devices, a lens system positioned on a demultiplex side of the waveguide-type multi/demultiplexing device laminate, and a reflective optical phase-modulating cell positioned on an opposite side of the waveguide-type multi/demultiplexing device laminate to the lens system. The lens system includes a lens alignment composed of plural lenses in one-to-one correspondence with the waveguide-type multi/demultiplexing devices and having a light-collecting or collimating function in the lens-aligning direction, an image-magnifying optical system having an N:1 (N&#x3e;1) image-magnifying function arranged on the optical phase-modulating cell side of the lens alignment, an f-f lens (Y) arranged on the optical phase-modulating cell side of the image-magnifying optical system, and having a light-collecting or collimating function in the same direction as the lens-aligning direction of the lens alignment, and an f-f lens (X) having a light-collecting or collimating function in a perpendicular direction to the lens-aligning direction of the lens alignment.

Optical waveguide-type wavelength domain switch

A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light outputted from an input port of the input/output port in one axis direction, a second lens for collecting light outputted from the first lens in a direction orthogonal to the collecting direction of the first lens, and an optical phase modulation cell for reflecting light outputted from the second lens through the second lens and the first lens to an output port of the input/output port. Alternatively, the input/output port may include at least two waveguide spectrometers and a waveguide optical coupler circuit stacked in thickness direction.

Waveguide type wavelength domain optical switch

Growing community of inventors

Tsukuba, Japan

Toshifumi Hasama