Abstract
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 language | English |
|---|---|
| Pages (from-to) | 242-257 |
| Number of pages | 16 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 1442 |
| State | Published - 1991 |
| Event | 7th Meeting in Israel on Optical Engineering - Tel-Aviv, Isr Duration: 12 Nov 1990 → 14 Nov 1990 |