JPS5943522Y2 - light switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an optical switch for an optical data station necessary for an optical fiber transmission optical dataway.

Conventionally, there has been an optical switch of this type as shown in FIG.

In this figure, 1a and lb are respectively 1st. The input optical connector receptacle 2b of the second trunk optical fiber transmission line 2a is a first trunk optical fiber transmission line 1a which has a built-in collimating lens. The output optical connector receptacle 2c is an optical connector receptacle for output to the terminal device 10 with a built-in condensing lens, and 2d is the optical connector receptacle for input from the terminal device 10 with a built-in collimating lens (hereinafter referred to as 2).
a to 2 and d are simply referred to as receptacles), and the receptacle 2a and the receptacle 2b are fixed with their optical axes aligned.

3 is a box, 1c and ld are the receptacle 2c and receiver 8. Fiber transmission lines 13a and 13b respectively couple the receptacle 2d and the transmitter 9.

13c is a conductive wiring that transmits electrical signals.

4 is a reflecting mirror having two reflective surfaces 4a and 4b; 5 is a movable iron piece to which the reflecting mirror 4 is fixed; 6 is an electromagnet; 7 is a spring;
11 is an excitation coil for the electromagnet 6, and 14 is an electrical connector for supplying electromagnetic current to the excitation coil 11, which provides a means for repeatedly moving the 1-reflector 4.

12at12b is a collimated signal light beam.

Next, the operation will be explained.

Excite the electromagnet 6. When the movable iron piece 5 is pulled and held in a predetermined state, the reflector 4 fixed to the movable iron piece 5
is inserted into the optical axis between the receptacles 2a and 2b and remains stationary, and its reflective surfaces 4a and 4b allow the signal light beam 12a from the first trunk optical fiber transmission line 1a and the terminal device 10. The signal light beam 12b from the receptacle 2d is reflected and sent to the receptacle 2a of the first trunk optical fiber transmission line 1a, the receptacle 2c to the terminal device 10, and the receptacle 2b to the second trunk optical fiber transmission line 1b.
The rest position of the reflecting mirror 4 is adjusted and set so that the optical axes of the mirror 4 and the receptacle 2d from the terminal device 10 coincide with each other.

At this time, the signal light propagated through the first trunk optical fiber transmission line 1a is collimated into a signal light beam 12a by a lens built in the receptacle 2a.
The light is emitted into the box 3 of the optical switch.

When the electromagnet 6 is energized and the reflecting mirror 4 fixed to the movable iron piece 5 is inserted into the optical path of the signal light beam 12a, the signal light beam 12a passes through the reflection surface 4a.
is reflected by the terminal device 100, enters the receptacle 2c, and is transmitted to the receiver 8, which is an optical-to-electrical converter as the input side of the terminal device 100, via the optical fiber transmission line 1c, and is then detected as an electrical signal. After being processed, the output side of the terminal device 10 is a transmitter 9, which is a σ electric-to-optical converter, where the signal is again converted into an optical signal and transmitted to the optical fiber transmission line 1d.

In the receptacle 2d, the signal light beam 12b is collimated by 11i and is emitted into the box 3, reflected by the first reflecting surface 4b, and enters the receptacle 2b with a built-in condensing lens, where it is transmitted again through the second trunk optical fiber. The first route is selected by being propagated to path 1b.

Next, a case where the second path is selected by the optical switch will be described.

If the terminal device 10 suffers some kind of q-failure and stops operating normally, the absorption power of the electromagnet 6 is canceled by cutting off the control current supplied from the terminal device 10.

The movable iron piece 5 is pulled back by the spring 7, the reflecting mirror 4 is removed from the optical path of the collimated signal light beam 12a, and the signal light beam 12a is directly incident on the receptacle 2b, bypassing the terminal device 10 and redirecting to the second The signal is propagated to the trunk optical fiber transmission line 1b.

Since the conventional optical switch for an optical data station is configured as described above, its terminal device 10 and receiver 8
When all power to the transmitter 9 is turned off, the excitation current of the optical switch is also turned off.

Since the optical data station is bypassed, there is no inconvenience, but if the optical data station is normally controlled by the master optical data station, another optical fiber transmission line is required, and if the optical data station of each party When controlling a switch using a command signal superimposed on a signal light from a master optical data station, once the excitation current of the optical switch is turned off and bypassed.

In the optical data station and terminal equipment,
Since the signal light is not shielded, there is a drawback that the optical switch cannot be returned to its original state when necessary.

This idea was made to eliminate the above-mentioned drawbacks. A beam splinter is installed just before the signal light enters the second trunk optical fiber transmission line, and a light receiving element extracts a part of the signal light and monitors it. It is an object of the present invention to provide an optical switch that can control the moving means of the reflecting mirror of the optical switch by attaching the following.

An embodiment of this invention will be described below with reference to FIG.

In FIG. 2, 15 is a beam splinter installed immediately before the signal light beam 12b enters the receptacle 2b of the second trunk optical fiber transmission line 1b, and 16 is the signal light beam split by the beam splinter 15. Light beam for monitoring part of 12a or 12b, 1
7 is a light receiving element for receiving the monitoring light beam 16;

Reference numeral 18 denotes a conductive wiring that connects the light receiving element 11 and the terminal device 10.

Note that the same reference numerals as in FIG. 1 indicate the same or corresponding parts.

Next, the operation will be explained.

Operation of a light switch. The operation is exactly the same as the conventional one shown in FIG.

What if an optical switch control command signal is superimposed on the optical signal from the master optical data station that has propagated through the first trunk optical fiber transmission line 1a?

If the signal light is unnecessary for the terminal device 10, the terminal device 1
A part of the signal light beam 12b emitted from the beam splitter 15 is split by the beam splitter 15.

By turning off the excitation current of the optical switch according to the command signal received by the light receiving element 17.

The movable iron piece 5 that fixed the reflecting mirror 4 is pulled back by the spring 7, and the reflecting mirror 4 is removed from the optical path of the signal light beam 12a, so the signal light does not reach the terminal device 10 and is bypassed, and is transmitted through the second trunk optical fiber. It is directly connected to path 1b and propagated.

In addition, a portion of the bypassed signal light is also split by the beam splinter 15 and monitored by the light receiving element 11.

If the monitor light-receiving element 11 receives a signal necessary for this terminal device 10 again, the signal is received from the terminal device 10 according to the command.

The excitation current of the optical switch is supplied again, the electromagnet 6 is excited and the movable iron piece 5 is attracted, and the reflecting mirror 4 again receives the signal light beam 12af from the first trunk optical fiber transmission line 1a).
, J path, and its signal light beam 12a is coupled to the receptacle 2c to the terminal device 10 to activate the terminal device 10.

After completing the signal processing, the signal light beam 12b emitted from the receptacle 2d from the terminal device 10 is reflected by the reflecting surface 4b of the reflecting mirror 40, and is connected to the second trunk optical fiber transmission line 1b.
is incident on and propagated.

As explained above, this idea splits a part of the signal light using a beam splitter installed just before it enters the second trunk optical fiber transmission line, and allows it to be constantly monitored by a light receiving element. This has the effect of making it easier to control the switching of the optical data station, thereby significantly improving the functionality of the optical data station.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional optical switch for an optical data station, and FIG. 2 is a block diagram showing an embodiment of this invention. In the figure, 1a is a first trunk optical fiber transmission line. 1b is a second trunk optical fiber transmission line, 1c and 1d are optical fiber transmission lines, 2aj 2b, 2c, 2d are receptacles, 3 is a box, 4 is a reflecting mirror, 4as4b is a reflecting surface, 5
is a movable piece of iron, 6 is an electromagnet, and 7 is a spring. 8 is a receiver, 9 is a transmitter, 10 is a terminal device, 11 is an exciting coil, and 12a and 12b are signal light beams. 13 a, 13 b s 13 c are conductive wiring, 14
15 is an electrical connector, 15 is a beam splitter, 16 is a monitoring light beam, 17 is a light receiving element, and 18 is a conductive wiring. Note that the same reference numerals in Figure 1 indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] A first path for bypassing an optical signal from the first optical fiber transmission line to a second optical fiber transmission line. Selecting a second path that sends the optical signal from the first optical fiber transmission line to the input end of the terminal device and sends the optical signal from the output side of the terminal device to the second optical fiber transmission line. a reflecting mirror having a first and a second reflecting surface, and moving means for moving the reflecting mirror; In a light switch designed to select
A beam splitter is installed on the input side of the second optical fiber transmission line, and a light receiving element receives a part of the optical signal obtained by the beam splitter and immediately before being input to the second optical fiber transmission line. An optical switch characterized in that the moving means is controlled by a monitor signal obtained from the light receiving element.