Performance analysis of polarization maintaining fiber directional coupler

E. Shafir, A. Hardy, M. Tur

Research output: Contribution to journalArticlepeer-review


Commercial tunable polarization maintaining fiber couplers exhibit inadequate low polarization isolations. Utilizing a newly developed coupled mode theory, we theoretically analyze the performance of these devices, and conclude that these low values can be explained in terms of finite misalignments of few degrees between the two fibers' principal birefringent axes. We also show that for a given device with 3dB coupling ratio the polarization isolation critically depends on the transverse setting, and can vary between 18 and 40dB for the case of 5° misalignment, in a coupler composed of 3mm beatlength fibers.

Original languageEnglish
Pages (from-to)371-379
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 5 Jul 1989


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