JPS5818614A - Optical fiber discriminator - Google Patents

Abstract

PURPOSE:To discriminate optical fibers, and to realize the efficiency and reliability of maintenance inspection for optical communication by inputting data signal light to each optical fiber, and obtaining its converted electric signal at an output side. CONSTITUTION:Light incident to a semiconductor laser element 2 is coupled with optical fibers 6-10 in order through a collimator lens 4, a rotary reflecting mirror 1, and a condenser lens 5. Output light beams from the fibers 6 and 7 are supplied through photodetectors 11 and 12 to a signal generator 13, which generates a clock signal to the element 2. By this clock, modulated light beams regarding code numbers of the fibers 8-10 are obtained, and propagating light beams 14-16 of the fibers 8-9 contain data on the code numbers of the fibers. Therefore, the light beams 14-16 are converted into electric signals by the photodetectors to extract data signals when patterns of synchronizing signals coincide mutually, thus the optical fibers are discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of ζ relates to a device for individually identifying a plurality of assembled optical fibers.

In optical communication using optical fibers, multiple optical fibers are assembled and wired, but there is a problem with the correspondence between the input end and output end of each optical 7-iper, and generally color codes are used. The method of identification is by making it into a cable.

However, in order to prevent erroneous connections, it is necessary to confirm by some means, but in the past, a method of communicating using another communication means was used, and an appropriate identification device was required. Therefore, this invention inputs light containing a data signal such as a number into each optical fiber on the input side, converts the optical signal into an electrical signal on the output side, and extracts the original data signal, thereby identifying the optical fiber. The purpose is to do this, and the means for that purpose is a modulated light source section, an optical scanning mechanism that spatially scans the light, and a synchronization signal and various data signals that are synchronized with the optical scanning mechanism and output to the electric light source section. The above object is achieved by an optical device consisting of a signal generator and a signal generator.

The receiving device can be the same as that used for POM communication.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, which is of a type in which optical scanning is performed by a rotating reflecting mirror l. In FIG. 1, light 3 emitted from a semiconductor laser element 2 is converted into parallel light by a lens 4, and light 3 is reflected by the surface of a rotating reflector 1.
is focused by the lens 5. The rotating reflector 1 rotates at a constant angular velocity, so the light 3 becomes the light 7 and the light 5e7.
-8-9●10 are combined in order. Hikari 7 Eye/(6-
Light receiving elements l1 and l2 are respectively attached to 7,
The output signal is input to the signal generator 13.

Since the output signal of the light-receiving elements 11-12 is in the form of a wide pulse, if the rising edge is extracted and used as a clock signal, it becomes a timing signal for coupling the light 2 to the optical fibers 8, 9, and 1O. Therefore, in the signal generator 13, "
When a data signal regarding the synchronization code and the code number of the optical fibers 8, 9@1°, similar to those used in PCM communication, is generated and the semiconductor laser device 2 is modulated by this signal, the optical fibers 8, 9, The light beams 14Φ15 and 16 respectively propagating through 1o contain data regarding each code number of the pre-input eyeballs 8 and 9, 10.

In this example, the number of optical fibers is three.
In an actual device, a ratio of several tens is possible, and the larger the number, the more advantageous it is in terms of cost. Optical fibers for measurement are connected to the ends of the optical fibers 7, 8, and 9 and 10 using optical connectors or groove connectors. On the output side, the emitted light is converted into a light-receiving signal by the light-receiving element, and when the synchronization signal pattern matches, the data signal is extracted and displayed as a number or voice, and the code number of the optical fiber being measured can be determined. In addition to the code number, data such as the name of the station on the input side, the name of the person in charge, and the optical power value of the input light can also be sent to simultaneously measure the transmission loss.

As described above, according to the present invention, it is easy to identify optical fibers individually, and there is no need to use special communication means as an auxiliary means, so the farther apart the fibers are, the more advantageous it is. Also, for wiring harness testing, it can be tested by one person by simply setting the input side. In the example, an example was shown in which the light is scanned by a rotating reflector, but in addition to this, a method using a vibrating reflector or a method in which the optical fiber itself is vibrated and scanned is also possible, and the light source may also be a light emitting diode or a gas laser. Can be used. By unifying clock frequencies and synchronization codes, all transmitters and receivers will be compatible, making them distinguishable even when installed between different countries, such as undersea cables.

This device is a very important measuring instrument for the practical application of optical communications, and is essential for streamlining maintenance and inspection work and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention. 1- rotating reflector, 2- m- semiconductor laser element, 3-
--Light, 4, 5---Lens, 6, 7, 8, 9, 1o-
- Some fibers, 11/12-m - Photodetector, 13-m
- Signal generator, 14, 15, 16 --- Optical patent applicant Ritsuo Hasumi Figure 1

Claims (1)

[Claims] A device consisting of a modulated light source, an optical scanning mechanism that spatially scans the light, and a signal generator that outputs a synchronization code and various data signals to the light source in synchronization with the optical scanning mechanism.