The device input/output optical radiation into the fiber light guide

 

(57) Abstract:

The invention is used in fiber-optic communication lines and provides increased efficiency light direction and junction forward and reverse communication channels. The device input/output radiation in the fiber light guide includes a main waveguide and directional coupler. The tap is made in the form of fiber-optic chords tap, the total end of which is mounted relative to the end of the main optical path with a certain gap. 1 Il.

The invention relates to passive components, fiber optic equipment, and specifically to devices of input optical radiation into the fiber light guide.

The development of a variety of communication systems based on fiber optics requires the creation of a broad set of functional elements in optical performance. To save systems with complex architecture requires the development of effective devices input/output information.

Known input device radiation [1] , [2] on the principle of spatial division of the luminous flux in the form of a corner cube reflector, which radiation from the source sends its fiber is config tap. It consists of two twisted and fused segments of the optical fibers.

A common shortcoming for the considered devices is the low efficiency of the directivity of the transmitted light flux and low junction forward and reverse flows of light. Luminous flux output of main optical path after the split in equal parts is directed to the photodetector and the radiation source. At the entrance of main optical path of the luminous flux from the radiation source as a result of weak junction channels illuminates your sensor.

The closest to the essence of the present invention is the device I / o-based lock detector [4] . The radiation from the source is introduced into a segment of single-mode fiber and then goes into the main optical path. At the other end of the path is joined with another segment of single-mode fiber. The optical signal from the main tract is not fully reaches the end of the single-mode fiber, and is dissipated at the junction of these fibers and going through the photodetector.

The main disadvantages of this device I/o is the low efficiency of the light direction of the forward and backward radiation.

The aim of the present invention is to improve the efficiency of light direction and junction forward and reverse communication channels.

This goal is achieved by the presence in the line termination device input/output radiation representing a fiber-optic chords directional coupler, the total end face is set towards the end of the main optical path with a certain gap.

New in this invention is matching device made in the form of fiber-optic chords optical coupler, the total end of which is installed a certain gap relative to the end face of the main tract. Matching device directs the major part of the light flux to the light receiver and only a small part returns to the source, thereby allowing to obtain a new a higher level of efficiency of the radiation pattern and decoupling of direct and reverse data channels.

The gap between the end face of the coupler and the trunk optical fiber is calculated according to the formula (see drawing):

,

where D is the diameter of the trunk of filaments is the gadfly of the tap.

The degree of decoupling of direct and reverse data channels is determined by the expression:

,

where Pand- luminous flux on the emitting end face of the Central optical fiber coupler;

Pp- luminous flux entering into the receiving fiber optic cable tap.

The relationship between the light threads on the ends of the emitting and receiving optical fibers is determined by expression:

,

where K is the reflection coefficient from the end of the main optical path;

and is the radius of the main optical path;

R is the equivalent radius of the fiber.

This matching device was implemented in the current line. The core diameter trunk light gadfly 62.5 μm, the diameter of the fiber in the coupler 25 μm, a gap of 50 μm, the level of the junction between the forward and reverse channels 65dB.

Sources of information

1. Iga H. , Oikawa M , "Stacked Planar Optics. Proc. Integr. Opt. and Opt, Fib. Comm. Conf. ", Tokyo, 1981, p. 493-494.

2. Masuda S, Iwama T. "Single-mode Fiber optic Directional Coupler", Appi opt. 1982, v. 21, p. 3484-3488.

3. The Belovolov M. I. , Dianov E. M. , Archer, A. C. , "Fiber optic directional couplers with low losses", Quant. electronics. 1985, 12 so.

4. Andreev, A. A. , M. Butusov M , Rudenko centuries "Detection the Oia in the fiber light guide, including the main waveguide and directional coupler, characterized in that, to increase the efficiency of light direction and junction forward and reverse communication channels, the tap is made in the form of fiber-optic chords tap, the total end of which is mounted relative to the end of the main optical path with a gap, the magnitude of which is determined by the formula

< / BR>
where D is the core diameter of the main light guide;

D1the core diameter of the optical fiber coupler;

NA is the numerical aperture of the fiber coupler.

 

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