To improve accuracy of multiplexing of modes, reduce loss in multiplexing, and realize mode multiplex transmission in a broadband using an existing fiber device.
A mode multiplexing part 13 converts optical signals having a basic mode propagated by a second waveguide 12 to optical signals having a higher order mode of a first waveguide 11, and multiplexes the optical signals having the higher order mode of the first waveguide 11 after conversion to the optical signals having the basic mode propagated by the first waveguide 11. The mode multiplexing part 13 comprises a coupling part 14 which is capable of mode coupling between the first waveguide 11 and the second waveguide 12, and a delay part 15 which is incapable of mode coupling between the first waveguide 11 and the second waveguide 12 and sets an optical path difference. By appropriately designing an optical path length in the coupling part 14 and the optical path difference in the delay part 15, mode multiplexing efficiency of the entire mode multiplexing part 13 is roughly fixed in a high state almost independent of a using wavelength in a using wavelength band.
| JP2016212414 | WAVEGUIDE COUPLING CIRCUIT |
| JPH01282510 | PRODUCTION OF OPTICAL COUPLER |
| JP3258542 | BRANCH AND CONFLUENCE OPTICAL WAVEGUIDE |
SAKAMOTO YASUSHI
MATSUI TAKASHI
TOMITA SHIGERU
SAITO KUNIMASA
KOSHIBA MASANORI
UNIV HOKKAIDO
| JP2004157506A | 2004-06-03 | |||
| JPH03213829A | 1991-09-19 | |||
| JP2005070189A | 2005-03-17 | |||
| JPH08234050A | 1996-09-13 | |||
| JP2010533894A | 2010-10-28 |
JPN6015051597; Ｂｒｅｎｔ Ｅ． Ｌｉｔｔｌｅ ａｎｄ Ｔｏｍ Ｍｕｒｐｈｙ: 'Ｄｅｓｉｇｎ Ｒｕｌｅｓ ｆｏｒ Ｍａｘｉｍａｌｌｙ Ｆｌａｔ Ｗａｖｅｌｅｎｇｔｈ-Ｉｎｓｅｎｓｉｔｉｖｅ Ｏｐｔｉｃａｌ Ｐｏｗｅｒ Ｄｉｖｉｄｅｒｓ Ｕｓｉｎｇ Ｍａｃｈ-Ｚｅｈｎｄｅｒ Ｓｔｒ' ＩＥＥＥ ＰＨＯＴＯＮＩＣＳ ＴＥＣＨＮＯＬＯＧＹ ＬＥＴＴＥＲＳ Ｖｏｌ．９， Ｎｏ．１２, 199712, ｐｐ．１６０７-１６０９
Katsuhiro Imashita