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Eri TAGUCHI Takeshi FUJISAWA Yoko YAMASHITA Shuntaro MAKINO Nobutomo HANZAWA Taiji SAKAMOTO Takashi MATSUI Kyozo TSUJIKAWA Kazuhide NAKAJIMA Fumihiko YAMAMOTO Kunimasa SAITOH
A PLC based mode multi/demultiplexer based on asymmetric directional coupler has advantages in terms of compactness, mass productivity, low insertion loss, and matured reliability. However, it has relatively large wavelength dependence due to the difference of coupling length. To expand the bandwidth, we have designed two-mode (LP01/LP11a) multi/demultiplexer by wavefront matching method and demonstrated the broadband and low-loss characteristics. This paper reviews the device design by wavefront matching method and investigates the mechanism of its broadband characteristics.
Norihiko HARADA Manabu YOSHIKAWA Hiroshi KAYANO
Splice Loss of LP modes in multimode graded-index optical fibers is investigated. It becomes clear that splice loss of particular mode and the excitation rate of the other modes by mode conversion is predicted from the factor, e.g. fiber axis misalignment, fiber and face gap, end fiber end face inclination.