FR2552555A2 - Switching device for optical fibres - Google Patents

Abstract

The subject of the present addition is an improvement to the device of the main patent so as to preserve all the advantages of the system and to increase the yield thereof. In order to achieve this, a paraboloid is used which is transparent and reflecting in its non-axial portion and this paraboloid is terminated by a polished and treated plane face, perpendicular to the axis.

Description

In patent 82/17191, we claimed the use of a paraboloade made of transparent material (glass or plastic) reflecting on the parabolic surface to, by different combinations, ensure - the junction of two identical or different optical fibers, - the separation, or the union, of the vehicle signal nar an optical fiber
in 2, 3, 4, etc ... signals in a proportion chosen in advance, - wavelength filtering by allowing filters, interference
or absorption to work in normal radiation, - perfect achromatism at all these frequencies
However, the devices recommended in patent 82/17191 had, in common, the use of a parabolode along its axis of revolution, hence poor performance due to mechanical occultations.

This additive relates to a device making it possible to eliminate this drawback.

It will be better understood, an example of embodiment of the basic constituent, with reference to FIG. 1. In the latter (1) denotes the paraboloid made of a transparent material at all the wavelengths used, (2) is the reflective face and its possible protection. The, (3) is the front face, flat, polished and treated, (4) is a portion of the paraboloid removed before machining and treatment of the face 5, (6) is the optical fiber whose central end is on the face 5 at the focal point of the paraboloid, (7) and (8) denote the extreme rays, (9) represents the surface crossed by the energy on the plane 3.

We have also shown in Figure 2, a plan view of the assembly of 3 identical devices allowing the separation of an optical signal into two identical signals: (1) represents a paraboloid and its optical fiber (6) as in Figure 1 B. Two identical sets are placed side by side (faces (12) and (13)) resting by their planar faces on the face (3) of (1).

The paraboloid (10) therefore returns half of the energy flow from the beam (9) into the fiber (14). Similarly, the dish (11) captures the other half to concentrate it in (15).

Of course, just as we have amputated (1) from part (4), we can reduce (10) and (11) unnecessary portions.

Claims (2)

1. Optical device consisting of an optical part comprising one, or more, paraboloids of revolution, characterized in that one, or more, optical fibers are centered on their focus. 2. Use of a portion of parabolold, off the axis.