Liekki Oy

Corelase Oy

Nlight Oy

Kalle Ylä-Jarkko

Simo Kaarlo Tammela

Arto K Salokatve

Simo Tammela

The invention relates to a bundle of optical fibers and a process for its preparation, wherein at least two of the optical fibers are at least partly attached to each other lengthwise by means of a removable longitudinal bridging element. Typically, the bridging element is an open one-hole capillary.

Optical fiber fabrication

An active multimode optical fiber consisting of a first core section (), a thin barrier layer () material having a thickness (d) and a lower refractive index than that of the first core section by an index difference (&#x394;n), a second core section () having a refractive index equal or higher than that of the first core section, and a cladding () having an index lower than that of the first core section. Said index difference and said thickness are selected so that a fundamental core mode couples less strongly with said cladding modes than higher order core modes. A scheme of changing the symmetry of the fiber for reduced sensitivity of the fundamental mode of the first core section to resonance effects.

Optical fiber gain medium with modal discrimination of amplification

The invention relates to a process of preparing an optical fiber joint, wherein an optical fiber or its undrawn precursor is brought into contact with a longitudinal element and attached to it via a ridge-groove fitting prior to drawing of the final optical fiber joint. The longitudinal element can be another optical fiber or its precursor or a removable and/or workable bridging element.

Growing community of inventors

Hämeenlinna, Finland

Kalle Ylä-Jarkko