Optimizing imbalance and loss in 2 x 2 3dB multimode interference couplers via access waveguide width

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Abstract

The imbalance and excess loss in multimode interference couplers with fabrication errors are examined. Remarkably, there exists a number of optimum access waveguide widths which give a minimum imbalance. Furthermore, quite low excess loss can be simultaneously achieved by choosing one particular optimum width. It is also shown that paired interference couplers have better imbalance performance than general interference couplers, given the same fabrication tolerances and length constraint for both coupler types. In particular, a paired interference coupler with an access waveguide width approximately 0.3 times the coupler width has the best imbalance performance. These results are obtained using a simple model and are supported by more sophisticated numerical models and experimental data from couplers fabricated in InP/InGaAsP.
Original languageEnglish
Title of host publicationPostconference digest / Conference on Lasers and Electro-Optics [CLEO 2003, Baltimore, Md.]
Place of PublicationWashington, DC
PublisherOptical Society of America (OSA)
Pages1340-1342
Number of pages3
ISBN (Print)1-557-52748-2
Publication statusPublished - 2003
Event2003 Conference on Lasers and Electro-Optics (CLEO® 2003) - Baltimore, United States
Duration: 1 Jun 20036 Jun 2003

Publication series

NameTrends in optics and photonics
Volume88

Conference

Conference2003 Conference on Lasers and Electro-Optics (CLEO® 2003)
Abbreviated titleCLEO® 2003
CountryUnited States
CityBaltimore
Period1/06/036/06/03

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