Single-mode fibers to single-mode waveguides coupling with minimum fresnel back reflection

Anat Sneh*, Shlomo Ruschin, Emanuel Marom

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Slantly polished fibers and waveguides coupling as a means for achieving both low optical power reflection and efficient power transmission is proposed. Return losses exceeding -70 dB can be obtained in fiber-to-Lithium Niobate waveguides operating at λ = 0.633 μm and λ = 1.3 μm by polishing the fiber at an angle of 6°. A phase matching condition between the propagation constants β and the polishing angles α in the fiber and the waveguide: β(fiber)sinα(fiber) = β(waveguide)sinα(waveguide) must be fullfiled in order to enable efficient power coupling. Polishing angle tolerances of approximately ±1° are allowed for a maximum of 1 dB decrease in the coupling efficiency.

Original languageEnglish
Pages (from-to)242-257
Number of pages16
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1991
Event7th Meeting in Israel on Optical Engineering - Tel-Aviv, Isr
Duration: 12 Nov 199014 Nov 1990


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