1. Device of the coupling between a luminous source (1) having a divergent radiation and a predetermined emission surface and an optical transmission fiber (2) the entrance face of which has a surface which is substantially equal to the emission surface of said source, said coupling device comprising an optical intermediate discrete component (3) having two opposed plane end faces one of which is arranged in facing relationship to the emission face of the source (1) and the other of which is arranged in facing relationship to the entrance face of the transmission fiber (2), this source (1) and this optical intermediate component (3) being secured on a positioning carrier to form an emitting base, and the emission surface of the luminous source (1) and the surface of the entrance face of the optical intermediate component (3) being likewise substantially equal surfaces, characterized in that said optical intermediate discrete component (3) is an element shaped as a truncated cone the surface of the output face of which has a value exceeding that of the surface of the entrance face of the transmission fiber (2) and the numerical input opening (ONEC ) of which exceeds that (ONFT ) of the transmission fiber, thus permitting to enlarge the alignment tolerances at the connection between the truncated cone element and the transmission fiber without impairing the efficiency of the total coupling between the source and the transmission fiber compared to the case where said intermediate element would be formed by a straight fiber having a cross sectional surface equal to that of the transmission fiber.

Coupling arrangement for a light source with divergent radiation and an optical fibre

Aperture converter is for coupling an optical transmitter having a relatively small circular couling surface esp. a l.e.d. to a tapered fibre. A bridge passage leading to the fibre is formed from two coaxial zones tapering to the same extent. A core zone has a refractive index profile corresponding to a tapered fibre. This core zone ends at a sleeve zone of lower refractive index and approaches a paraboloid of revolution. The sleeve zone extends over the core to approach a truncated cone shaped projection. The refractive index increases with the diameter of the sleeve zone.

Aperture converter coupling LED to tapered fibre - has sleeve zone extending over core zone to form truncated cone shaped projection

Verfahren und vorrichtung zum einstellen einer laserlichtmenge

LA PRESENTE INVENTION CONCERNE UN DISPOSITIF DE COUPLAGE ENTRE UNE SOURCE LUMINEUSE, NOTAMMENT UNE DIODE ELECTROLUMINESCENTE, ET UNE FIBRE. LE DISPOSITIF COMPREND UN COMPOSANT OPTIQUE INTERMEDIAIRE DE FORME CONIQUE 3 DONT LES FACES SONT COUPLEES AVEC D'UNE PART LA FACE DE SORTIE DE LA SOURCE 1, ET D'AUTRE PART LA FACE D'ENTREE DE LA FIBRE 2. LE DIAMETRE DE LA FACE DE SORTIE DU CONE 3 EST SUPERIEUR AU DIAMETRE DE LA FACE D'ENTREE DE LA FIBRE 2. APPLICATION AUX TELECOMMUNICATIONS OPTIQUES.

Dispositif de couplage entre une source lumineuse a rayonnement divergent et une fibre optique

The optical coupling method permits a light emitting diode or laser beam source to be connected with an optical fibre by the use of an optical transformer. A horn shaped reflector may be used to convert a rectangular profile light source to a circular profile. The reflector may be used as a device to produce a lobe with a circular cross-section to connect with from a cylinder a cylindrical fibre or may produce an elliptical section profile to connect from the rectangular form. For a laser coupling the relevant equations are of the type dx. sin (psi)X 2 a no square root 2. delta. f; dy. sin (psi)y 2 a no square root 2. delta. f. Where dx. dy are the aperture coordinates, 2a is the diameter of the optical fibre, no is the refractive index, (psi)x, y are the aperture angles and delta. f. is the refractive index differential ratio.

Coupling technique for LED or laser to fibre - has optical transformer in form of horn reflector and sheathed core fibre with rotational symmetry

The fault indicator has a display (17) and display triggering circuit (24) connected between the CW controller (8) and the power supply. The display circuit (17) contains a common-emitter transistor (18) with an indicator lamp (19) in its collector circuit and connected by its base via a resistor (21) to the output of the controller. The display triggering circuit contains a transistor (26) whose collector is connected to the control voltage, whose base is connected to the power supply of the laser and whose emitter contains a variable reference voltage source (27).

Timmermann Christian Dr Ing

Papers

Coupling technique for LED or laser to fibre - has optical transformer in form of horn reflector and sheathed core fibre with rotational symmetry

Fault indicator for control circuit of laser - has display circuit and display triggering circuit between power supply and CW controller