JP3170361B2 - How to fix optical fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber fixing method for fixing an optical fiber to a substrate in close contact.

[0002]

2. Description of the Related Art Conventionally, in order to fix a plurality of optical fibers to a substrate, the optical fibers are fixed with an adhesive or a low-melting glass while pressing the optical fibers with a pressing plate as shown in FIG. And JP-A-2-151808 and JP-A-3-155503.

[0003]

2. Description of the Related Art Due to the non-uniformity of a holding plate, an optical fiber floats from a substrate and is fixed. When connecting to another optical fiber or an optical waveguide, there is a problem that a coupling loss is likely to occur due to a shift of an optical axis. In addition, there is a problem that it takes time to align the end face between the optical fiber and the substrate provided with the V-groove.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for fixing an optical fiber capable of accurately and surely positioning and contacting an optical fiber. By coating the outer circumference with a conductor and applying a magnetic field to the optical fiber from the side of the substrate while applying current in the axial direction of the conductor, the optical fiber is positioned at a fixed position on the substrate by electromagnetic force and attracted. A method of fixing an optical fiber in which an optical fiber is closely fixed to a substrate with an adhesive or a low-melting glass is proposed.

[0005]

FIG. 1 is a schematic view of an apparatus for explaining a method of fixing an optical fiber according to a reference example for explaining the present invention. Reference numeral 1 denotes an optical fiber, the outer periphery of which is coated with a magnetic material 2. Reference numeral 3 denotes a ceramic substrate on which one or a plurality of V grooves 3a are provided. Reference numeral 4 denotes a magnet such as a permanent magnet or an electromagnet, which is disposed on the bottom surface of the substrate 3.
The optical fiber 1 is attracted downward in the V groove 3a. At this time, the position of the optical fiber 1 is adjusted by moving the magnet 4 so that the end surface of the optical fiber 1 is aligned with the end surface of the substrate 3 so that no step is formed. After coating, the optical fiber 1 is
After tightly fixing the groove 3a, the magnet 4 is removed. According to the present invention, since the outer periphery of the optical fiber 1 is coated with the magnetic material 2 or a conductor described later, a method using metal bonding such as soldering having excellent temperature characteristics is suitable for fixing.

FIG. 2 is a schematic view of an apparatus for explaining an optical fiber fixing method according to the present invention. The same members as those in FIG. 1 are denoted by the same reference numerals, and 22 is a conductor coated on the outer periphery of the optical fiber 1.
Specifically, it is a conductor such as a coated conductor or a coated braided copper wire, and 22a and 22b are electrodes. Numeral 3b denotes a magnetic film coated on the surface of the substrate 3 extending from the V groove 3a, and numeral 42 denotes a magnetic film 3
b is a magnet that applies a magnetic field to b. Here, when a current in the direction of arrow I is applied to the conductor 22 and a magnetic field in the direction of arrow H is applied to the magnetic film 3b, the optical fiber 1 is attracted below the V-groove 3a by Fleming's left-hand rule. The method of closely fixing the optical fiber 1 to the V groove 3a of the substrate 3 is the same as in the case of FIG.

As a method for pulling the optical fiber 1 below the V-groove 3a, a magnetic field in the direction of arrow H may be applied by a magnet 43 disposed on the lower surface of the substrate 3 as shown in FIG. Further, it is also possible to apply the appropriate ultrasonic vibration to the substrate 3 when the substrate 3 is closely fixed. Further, it is also possible to use an alternating current as a current to flow through the electromagnet, to flow a large current in the direction to attract the optical fiber 1 and to flow a small current in the direction to pull the optical fiber 1 away.

Further, according to the optical fiber of the present invention, an optical signal is transmitted by an optical fiber, and a conductor on the outer periphery of the optical fiber may be used as an electric signal transmitter or a ground wire.

[0009]

As described above, according to the method of the present invention, it is possible to provide a method for fixing an optical fiber capable of accurate and reliable positioning and close contact fixing.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for explaining a method of fixing an optical fiber according to a reference example.

FIG. 2 is a second diagram illustrating a method for fixing an optical fiber according to the present invention.
1 is a schematic diagram of an embodiment apparatus.

FIG. 3 is a third diagram illustrating a method for fixing an optical fiber according to the present invention;
1 is a schematic diagram of an embodiment apparatus.

FIG. 4 is a schematic view of a conventional apparatus for fixing an optical fiber to a substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical fiber 2 Magnetic body 22 Conductor 22a, 22b Electrode 3 Substrate 3a V-groove 3b Magnetic film 4,42,43 Magnet 5 Press plate

Claims (1)

(57) [Claims] In an optical fiber fixing method for fixing an optical fiber to a substrate, a conductor is coated on an outer periphery of the optical fiber, and a magnetic field is applied to the optical fiber from a side of the substrate while a current flows in an axial direction of the conductor. And fixing the optical fiber to the substrate by an adhesive or a low-melting glass while positioning and adsorbing the optical fiber at a fixing position of the substrate by electromagnetic force.