Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Friedrich-schiller-universitat Jena

Thomas Schreiber

Jens Limpert

Andreas Tünnermann

Steffen Bohme

Gerd Harnisch

Oliver De Vries

Simone Fabian

Marco Plotner

Nicoletta Haarlammert

Steffen Böhme

Carsten K Nielsen

Bülend Ortac

The invention relates to a method for laser-based splicing of a glass fiber () onto an optical component (), comprising the following steps: In order to specify an improved method in which the properties of the joining partners are maintained to the greatest extent during splicing, which exhibits high reproducibility and in particular is suitable for splicing joining partners of different cross-sections, the invention proposes that the angle of incidence of the laser beam () on the surface of the optical component be between 15° and 45°.

Laser-based splicing of glass fibers onto optical components

The invention relates to a method for producing an optical fiber coupler, having the following method steps:

Production of a fiber coupler

The invention relates to a MOPA laser system having at least one laser oscillator (MO), which generates laser radiation at an emission wavelength (&#x3bb;), and having an optical amplifier (PA) downstream the laser oscillator (MO) in the propagation direction of the laser radiation, which optical amplifier amplifies the laser radiation and thereby spectrally broadens it to a useful bandwidth (&#x394;&#x3bb;). It is an object of the invention to provide an improved MOPA laser system which is designed for a high power of the amplified laser radiation and which is insensitive to back-reflection. Unavoidable back-reflections should neither affect the output power of the optical amplifier (PA), nor lead to the destruction of the laser oscillator (MO) or other components of the system. This object is achieved by the invention in that an optical bandpass filter (BPF) is arranged between laser oscillator (MO) and amplifier (PA), which optical bandpass filter is transparent to laser radiation at the emission wavelength (&#x3bb;), wherein those spectral components of the returning, that is, counter to the propagation direction, laser radiation impinging on the bandpass filter (BPF), which, in terms of wavelength, lie outside the passband (), are reflected at the bandpass filter (BPF) in the propagation direction.

MOPA laser system with back reflection protection

The invention relates to a method for producing an optical waveguide (), the surface of which is at least partly coated with a coating material. The coating material contained in a target () is removed using laser radiation () of a processing laser or converted into another aggregate state. The coating material is then deposited on the surface of the waveguide () and forms a coating thereon, said coating modifying the light guidance. It is the object of the present invention to provide an improved method for producing optical waveguides, in which guidance of undesired electromagnetic radiation and/or guidance of radiation in undesired areas of the waveguide is avoided. To this effect, the present invention proposes that the laser radiation () reflected from the target () or transmitted through the target heats-up the waveguide (), said laser radiation () being polarized and impinging the target () at a specified angle (&#x3b1;) between 10&#xb0; and 80&#xb0; relative to the surface normal.

Coating of optical waveguides

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Jena, Germany

Thomas Schreiber