A Review of PLC-Based Broadband Two-Mode Multi/Demultiplexer Designed by Wavefront Matching Method

Eri TAGUCHI  Takeshi FUJISAWA  Yoko YAMASHITA  Shuntaro MAKINO  Nobutomo HANZAWA  Taiji SAKAMOTO  Takashi MATSUI  Kyozo TSUJIKAWA  Kazuhide NAKAJIMA  Fumihiko YAMAMOTO  Kunimasa SAITOH  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.7   pp.518-526
Publication Date: 2018/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.518
Type of Manuscript: INVITED PAPER (Special Section on Distinguished Papers in Photonics)
WFM method,  PLC,  MDM,  mode multi/demultiplexer,  

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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.