Sumitomo Electric Industries, Limited

Tetsuya Iimura

Hiroshi Suganuma

Tomomi Sano

Tamoya Kenmochi

Manabu Shiozaki

A first optical system () has a first beam splitter (). The first beam splitter () splits light arriving through a first optical path (P) into two light beams, and outputs one light beam to a second optical path (P) and the other light beam to a third optical path (P). A second optical system () outputs the light output from the first beam splitter () to the second optical path (P) and arriving at the second optical system () upon giving the light an intensity change with wavelength dependence and a phase change, and has a second beam splitter (), first reflecting mirror (), and second reflecting mirror (). This makes it possible to provide an optical filter () which can realize a characteristic excellent in isolation with a very simple arrangement.

Optical filter, interleaver, and optical communication system

An interleaver is provided with an optical system configured to split light having traveled from a first port to a half mirror, into two beams and direct the beams toward first and second reflectors, respectively. Light reflected by the first reflector and arrived at the half mirror is split into two beams and directed toward second and third ports, respectively. Light reflected by the second reflector and arrived at the half mirror is split into two beams directed toward the second and third ports, respectively. An etalon filter configured to cause a loss on either one of light incident thereto from the first port and the beams directed toward the second port and toward the third port.

Interleaver

The light which is input from an optical fiber to a first port is output to an optical path. The light which is input from the optical path to a half mirror is branched into two, and is output to the optical paths. The light which is output to the optical path reaches to and is reflected from a first reflecting mirror, and returns to the half mirror by an optical path. The light which is input to the half mirror by the optical path is branched into two, and is output to the optical paths. The light which is output to the optical path reaches to and is reflected from a second reflecting mirror, and returns to the half mirror by an optical path. The light which is input to the half mirror by the optical path is branched into two, and is output to the optical paths. The light which is output to the optical path is output from a second port to an optical fiber, and the light which is output to the optical path is output from a third port to an optical fiber.

Growing community of inventors

Yokohama, Japan

Tetsuya Iimura