JPS5927073Y2 - fiber optic link - Google Patents

Description

[Detailed description of the invention] The present invention relates to an optical fiber link, and in particular, it is easy to connect an optical fiber cable to a projector and a receiver, and
The present invention relates to an optical fiber link having a structure suitable for preventing mutual interference of electrical signals within a light projector and a light receiver.

An optical fiber link consists of a light projector consisting of an amplifier that amplifies an input signal and a light emitting element, an optical fiber cable that transmits the light from the projector, a light receiving element that receives the light transmitted by the optical fiber cable, and this light receiving element. A photoreceiver consisting of an amplifier that amplifies the output of the light source and sends out an output signal.

By the way, this conventional rod-end fiber link usually has a structure as shown in FIG.

In FIG. 1, 1 is a light projector, and the light projector 1 is composed of an input terminal 1a for an input signal (electricity), an amplifier 1b that amplifies the input signal, and a light emitting element 1C that emits light with the output of the amplifier 1b. .

2 is an optical fiber cable that transmits the light from the projector 1;
Reference numeral 3 denotes a light receiver, and the light receiver 3 includes a light receiving element 3a that receives light transmitted through the optical fiber cable 2, and a light receiving element 3.
an amplifier 3b that amplifies the output of a and sends out an output signal;
It also has an output terminal 3c for output signals (electricity).

By the way, in this case, the input terminal 1a and the light emitting element 1C are on the opposite side to the amplifier 1b, and the light receiving element 3a is on the opposite side to the amplifier 1b.
and the output terminal 3c are located on the opposite side to the amplifier 3b, so that mutual interference of electrical signals does not occur within the light projector 1 and the light receiver 3, respectively.

However, in this case, the input terminal 1a of the emitter 1 and the connection part 1d of the optical fiber cable 2, and the connection part 3d of the optical fiber cable 2 of the light receiver 3 and the output terminal 3C are located on opposite sides. Therefore, in some cases, it may become impossible to connect the optical fiber cable 2 to the light projector 1 and the light receiver 3.

In such a case, conventionally, as shown in FIG.
and the optical fiber cable 2 of the receiver 3 on the same side.
The connecting part 3d and the output terminal 3C are provided on the same side, but as shown in the figure, the light emitting element 1C1 and the light receiving element 3a are arranged near the connecting parts 1d and 3d of the optical fiber cable 2, respectively. Therefore, input terminal 1a and light emitting element 1C
Also, the light receiving element 3a and the output terminal 3C come close to each other, and mutual interference of electrical signals may occur within the light emitter 1 and the light receiver 3.

Therefore, as a countermeasure, a shielding body has been provided, or in order to achieve sufficient shielding, heavy metal must be used, and other solutions have been desired.

The present invention was developed in view of the above, and its purpose is to provide the input terminal of the emitter and the connection part of the optical fiber cable, and the output terminal of the light receiver and the connection part of the optical fiber cable, on the same side. Another object of the present invention is to provide an optical fiber link that can prevent mutual interference of electrical signals.

A feature of the present invention is that the input terminal of the emitter and the connection part of the optical fiber cable and the connection part of the optical fiber cable and the output terminal of the receiver are provided on the same side, respectively, and the light emitting element and the light receiving element are connected to the above input terminal. Or, place it far enough away from the output terminal to prevent mutual interference of electrical signals.
The present invention is characterized in that an optical fiber is disposed between the connecting portion of each of the optical fiber cables and the light emitting element and the light receiving element.

The present invention will be explained in detail below using the embodiment shown in FIGS. 3 and 4.

FIG. 3 is a circuit configuration diagram showing an embodiment of the optical fiber link of the present invention. In FIG. 3, the same parts or the same functions as those in FIG.

3, the difference from FIG. 1 is that the input terminal 1a for the input signal of the projector 1 and the optical connector 1e for connecting the optical fiber cable 2 are provided on the same side, and the optical connector 1e
and input terminal 1a to prevent mutual interference of electrical signals.
The optical fiber 1f is disposed between the light emitting element 1C and the light emitting element 1C arranged at a sufficiently distant position.

1. Similarly, the output terminal 3C for the output signal of the projector 3 and the optical connector 3e for connecting the optical fiber cable 2 are provided on the same side, and the output terminal is connected to the optical connector 3e to prevent mutual interference between the electrical signals. The optical fiber 3f is disposed between the optical fiber 3C and the light receiving element 3a which is placed at a sufficiently distant position.

According to the embodiment of the present invention described above, since the input terminal 1a of the emitter 1 and the optical connector 1e are on the same side, and the output terminal 3C of the light receiver 3 and the optical connector 3e are on the same side, the optical The fiber cable 2, input line, and output line can be easily connected in any case.

Moreover, the input terminal 1a, the light emitting element 1C, and the output terminal 3
Since C and the light receiving element 3a are separated to prevent mutual interference of electrical signals, mutual interference of electrical signals can be prevented without providing a shield.

Note that FIG. 4 is a circuit configuration diagram showing another embodiment of the present invention, and FIG. 4 shows a multi-channel optical fiber link.

In FIG. 4, input terminals 1 a , 1 of the projector 1
a', 1 a'' and the multipolar optical connector 1g, and the output terminals 3 C, 3C', 3C'' of the light receiver 3 and the optical connector 3g are provided on the same side, respectively, and the input terminals 1 a, l a',
1a" and the light emitting elements IC, IC', and IC" as far as possible from each other, and then connect the optical connector 1g and the light emitting element 1c.
, l c', l c'', respectively, with optical fibers 1
f, 1 f', and 1 f'' were arranged.

Furthermore, the output terminals 3c, 3c', 3c" and the light receiving elements 3a, 3a', 3a" are separated as much as possible, respectively, and the multipolar optical connector 3g and the light receiving elements 3a, 3
a′, 3 a″, and optical fibers 3 f and 3 a″, respectively.
3f' and 3f'', and a multicore optical fiber cable 4 was connected between the optical connectors 3g and 3e.

If a multi-channel optical fiber link is configured as shown in FIG. 4, the same effect as described above can be obtained.

As explained above, according to the present invention, even if the input terminal of the emitter and the connection part of the optical fiber cable and the output terminal of the light receiver and the connection part of the optical fiber cable are provided on the same side, mutual interference of electrical signals will occur. This has the remarkable effect of preventing this from occurring.

[Brief explanation of the drawing]

1 and 2 are circuit configuration diagrams of a conventional optical fiber link, FIG. 3 is a circuit configuration diagram showing one embodiment of the optical fiber link of the present invention, and FIG. 4 is a circuit diagram showing another embodiment of the present invention. FIG. 1... Emitter, 1a... Input terminal, l
b...Amplifier, 1C...Light emitting element, 1
e...Optical connector, 1f...Optical fiber, 2...Optical fiber cable, 3...
- Light receiver, 3a... Light receiving element, 3b...
・Amplifier, 3C...Output terminal, 3e...
・Optical connector, 3f...Optical fiber μ.

Claims (1)

[Scope of utility model registration request] A light projector consisting of an amplifier that amplifies an input signal, a light emitting element that emits light with the output of the amplifier, an optical fiber cable that transmits the light from the projector, and a light receiving element that receives the light transmitted by the optical fiber cable. In an optical fiber ring comprising a light receiver comprising an amplifier that amplifies the output of the light receiving element and sends out an output signal, an input terminal of the input signal of the light emitter, a connection part of the optical fiber cable, and the light of the light receiver. The connection part of the fiber cable and the output terminal of the output signal are provided on the same side, and the light emitting element and the light receiving element are located optically separated from the input terminal or the output terminal, respectively, so that mutual interference of electrical signals does not occur. An optical fiber link characterized in that an optical fiber is arranged between the connecting portion of each of the optical fiber cables and the light emitting element and the light receiving element.