JPS5930501A - No-break optical switch - Google Patents

Abstract

PURPOSE:To eliminate coupling loss and unbalance by placing two pieces of mirrors so as to face to each other at a prescribed angle and providing a mechanism for moving horizontally and turning these mirrors integrally and a condenser lens of a large diameter between the mirrors and an optical fiber for output. CONSTITUTION:The light which is made incident from fibers 1, 1' on an input side passes through lenses 2, is reflected by a two-faced mirror 6 formed of two pieces of mirrors 61, 62, is condensed with a large diameter lens 7 and is made incident to a fiber 5 on an output side. When the mirror 6 is moved in an arrow X direction as shown by an alternate long and two short dashes line, the reflected light of the incident light from the fiber 1 deviates from the large-diameter lens 7 as shown by a dotted line and only the incident light from the fiber 1' is made incident to the fiber 5. When the mirror 6 is moved conversely in an arrow Y direction, only the incident light from the fiber 1 is made incident to the fiber 5. If the mirror 6 is rotated in an X' or Y' direction, only the incident light from the fiber 1' or 1 is made incident to the fiber 5. The coupling loss and unbalance are thus eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an uninterrupted switch used for switching optical paths, and in particular to an uninterrupted switch that is equipped with a large-diameter condensing lens on the output side optical fiber. It concerns optical switches.

ib) Background of the technology In recent years, with the amazing progress of optical communication in communication equipment, it has become necessary to switch from frequently used optical fibers to other optical fibers, i.e., backup optical fibers, and this switching can be done by interrupting transmission. There is a strong demand for a non-instantaneous optical switch that can be switched reliably and without any interruption.

tc+ Prior Art and Problems FIG. 1 is a schematic diagram of a conventional uninterrupted switch. A lens, 3 is a prism, and 4 is a lens placed opposite to the output optical fiber 5.

This schematic configuration can be achieved by moving the prism 3 northward between the optical fibers of output L, that is, by moving the prism 3 by 4% M in the direction of arrow AMB. It is designed to output to fiber 5.

That is, when the prism 8 is moved in the direction of arrow B and removed from the optical path of the input optical fiber l, the optical signal of the input optical fiber l is transmitted to the output optical fiber 5, and the optical signal of the input optical fiber l is transmitted to the output optical fiber 5.
If we cut off each of the original signals Vi transmitted with original fiber y < l, at the same time
The output signal is refracted at the slope IAj of rhythm 3 and input to the output fiber 5. When No. 1d is being transmitted, Prism 3 is used when IL2 improves due to No. 16 transmission due to some reason.
Arrow H-1] Hyperactivity in direction A and n1 is good. However, since the fiber 3 is passed through the fiber 3 by force more than the ei-i original fiber 1 of the 11-element fiber 1, this 6
There was a problem in which losses and imbalances occurred.

1. Purpose of the Invention The object of the invention is to provide an M1/i-free system which eliminates the above-mentioned drawbacks of the conventional technique by pairing two mirrors at a predetermined angle and eliminating coupling loss and unbalance. It is something to do.

j91 h4 of the invention In order to achieve the above-mentioned object, the present invention provides an optical system that switches optical paths formed by a plurality of input (output) tul 1 source fibers and a plurality of output (input) photometric fibers. In the instantaneous cut-off switch, the optical system is integrally formed with two mirrors facing each other at a predetermined μ] degree, and the mirrors are horizontally moved and rotated (as well as adding a shallow structure,
This is achieved by providing a large diameter condenser lens between the output side optical fiber FJiJ and the mirror 1']iJ.

(G) Embodiment 1 of the Invention An embodiment of the instantaneous disconnection switch according to 41: Investigation will be described in detail below with reference to the drawings.

FIG. 3 is a schematic configuration diagram for explaining the fuo side of the invention, in which parts with the same numbers as those in FIG. jps
There are two mirrors, and 7 is a large diameter lens.

Mirrors 61 and 62 having the same focusing distance are made to face each other at a predetermined angle (θ) to form two integral mirrors 6,
Input 1 The optical fibers l and l are Ail 2 Upper dihedral mirror 6
The output side optical fiber 5 is arranged so as to correspond to the mirror 62.
The reflected light is reflected by the large lens 7 and then enters the output 41111 optical fiber 51.C.

By the way, when the second mirror 6 is moved as shown by the second arrow 2, the reflected light of the optical signal of the human power 1 element fiber 1 will come off the human power lens 7 as shown by the line, and the input +: l1
Only the reflected light of the original signal from the original fiber l enters the output gHIH original fiber 5. On the other hand, if you move it in the direction of the two-faced six-toothed arrow Y, the reverse light of the original signal of the input end optical fiber L will be removed from the large diameter lens, and only the light 'ld of the original fiber L will become the output side light. It enters the fiber 5. Also, when the mirror 6 is rotated in the direction of the arrow X, only the optical signal of the input optical fiber 1 enters the output optical fiber 5 41L, and the opposite direction is 1'. : When rotated in the 1-1 direction, the height will be the same as when horizontally moved in the Y direction. Then, the optical signal of the input optical fiber l and the output of the first optical fiber of the input optical fiber l + 1llll
When switching to the optical fiber 5, the input side optical fiber l
The structure is such that the optical signals of 1 and 1' are incident on the other hand overlappingly, and the incident puff-rebound curve is shown in FIG.

In other words, A III! 4 is the Taiki power curve from the input optical fiber 1 to the output optical fiber 5, curve 8 is the incident power curve from the input optical fiber 1' to the output 101j optical fiber 5, and the C curve is the AIjtl and B curve. is the overall curve of As can be seen from this puff curve, even if the input 1-law optical fibers 1 and 1' are switched, the coupling will not be cut off even momentarily.
If the distance ΔY between the light beams ' is made smaller, the coupling loss due to the movement of the two light beams 6 will be further reduced. The fourth section shows the shape in which the light beam enters the large-diameter lens 7, and the fifth section shows the coupling loss custom-made curve that moves the light beam in the direction of the arrow X.
Shown in the figure.

■ Effects of the Invention As is clear from the above explanation, the uninterrupted optical switch according to the present invention has less coupling power reaction than the conventional optical switch using a prism, which improves coupling customization. It is extremely useful for application to 6-wire optical repeaters and the like.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram for explaining the conventional non-interruption switch, and Fig. 2 is a schematic diagram for explaining an example of the non-interruption switch incorporated in the present invention. Ward, 3rd Ward (″11
．． Figure 4 shows the incident power fluctuation curve, Figure 4 shows the shape of the light beam condensed by the large-diameter lens, and Figure 5 shows the loss characteristic curve of the light beam. 2 and 4 are lenses, 8 is a prism, 6 is a biface mirror, 7 is a large-diameter lens, and 61 and 62 are mirrors. Figure 5

Claims (1)

[Claims] In an uninterrupted switch equipped with an optical system for switching an optical path consisting of a plurality of input (output) optical fibers and a plurality of output (input) O1I optical fibers, the optical system is connected to two optical fibers at a predetermined angle. The mirrors are integrally formed so as to face each other, and the mirrors are made of water 1Y4. '6 Moving and rotating machine 114
What is claimed is: 1. A non-interruption optical suite characterized in that a large-diameter condensing lens is provided between the output optical fiber 11111 and the mirror 1111.