CN210720812U

CN210720812U - Variable optical attenuator

Info

Publication number: CN210720812U
Application number: CN201921974551.2U
Authority: CN
Inventors: 陈惠龙
Original assignee: Shenzhen Hoyatek Co Ltd
Current assignee: Shenzhen Hoyatek Co Ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-06-09
Anticipated expiration: 2029-11-13

Abstract

The utility model discloses a light adjustable attenuator, including the casing that has the cavity structure, locate the knob on the casing and stretch into in the inside input optic fibre of casing and output optic fibre from the outside of casing, the inside activity of casing is provided with the sliding plate, the sliding plate with press from both sides between the casing and be equipped with fiber coil, fiber coil's week side with sliding plate, casing are inconsistent, input optic fibre with fiber coil connects, output optic fibre with fiber coil connects, wear to be equipped with a screw thread guide pillar between casing, fiber coil, the sliding plate, the one end of screw thread guide pillar stretch out in the casing outside and with the knob meets, the knob pass through the screw thread guide pillar drive the sliding plate to fiber coil's direction is thereby right fiber coil produces extrusion stress to make fiber coil crooked. The utility model discloses what utilize is that fiber coil's bending loss principle realizes the decay for output is adjustable.

Description

Variable optical attenuator

Technical Field

The utility model relates to an optical communication field, concretely relates to adjustable optical attenuator.

Background

An optical attenuator is a common device in the optical communication industry, and has a main function of adjusting the intensity of optical power, so that many experiments are more flexible and humanized, the output power of many semiconductor lasers is generally fixed when leaving a factory, and if the output power is changed by adjusting current, the shape of an output spectrum is changed or the central wavelength is shifted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide an adjustable optical attenuator.

The technical scheme of the utility model as follows:

a light adjustable attenuator comprises a shell with a cavity structure, a knob arranged on the shell, and an input optical fiber and an output optical fiber which extend into the shell from the outer side of the shell, wherein a sliding plate is movably arranged in the shell, an optical fiber coil is clamped between the sliding plate and the shell, the peripheral side of the optical fiber coil is abutted against the sliding plate and the shell, the input optical fiber is connected with the optical fiber coil, the output optical fiber is connected with the optical fiber coil, a threaded guide post penetrates through the shell, the optical fiber coil and the sliding plate, one end of the threaded guide post extends out of the shell and is connected with the knob, and the knob drives the sliding plate to move towards the direction of the optical fiber coil through the threaded guide post so as to generate extrusion stress on the optical fiber coil.

In the above scheme, a nut is embedded in a section of the threaded guide post close to the knob, and the nut limits the maximum moving distance of the sliding plate to the optical fiber coil.

In the above scheme, the optical fiber coil is a circular bend-sensitive single-mode optical fiber coil.

In the above scheme, the sliding plate is symmetrically provided with two limiting columns, the two limiting columns are located on two sides of the optical fiber coil, and the heights of the two limiting columns are equal and smaller than the width of the optical fiber coil.

In the above scheme, the housing includes a top fixed bracket and a bottom fixed baffle, the knob is disposed on the top fixed bracket, the sliding plate is movably disposed on the bottom fixed baffle, and the optical fiber coil is sandwiched between the top fixed bracket and the sliding plate.

In the above scheme, the top fixing support is an L-shaped three-dimensional structural member, and the inner side surface of the top fixing support is provided with a position for limiting the input optical fiber and the output optical fiber so as to place the input optical fiber and the output optical fiber.

In the above scheme, the input optical fiber and the output optical fiber are respectively arranged at the left side and the right side of the shell.

In the above scheme, the input optical fiber and the output optical fiber are sleeved with optical cable protective sleeves.

In the above scheme, the optical cable protective sleeve is fixed on the top fixing support through strong glue.

In the scheme, the periphery of the knob is provided with anti-skid grains.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model has the advantages of small structure, low cost and simple and convenient manufacture;

2. the attenuation of the power of any single-wavelength light in the communication waveband range can be well met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is the utility model provides a pair of adjustable optical attenuator's schematic structure diagram.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical solution of the present invention, the following description is made by using specific examples.

Examples

Referring to fig. 1, the present invention provides an adjustable optical attenuator, which includes a housing 1 having a cavity structure, a knob 2 disposed on the housing 1, and an input optical fiber and an output optical fiber extending into the housing 1 from the outside of the housing 1, wherein a sliding plate 3 is movably disposed inside the housing 1, an optical fiber coil 4 is sandwiched between the sliding plate 3 and the housing 1, the circumference of the optical fiber coil 4 is in contact with the sliding plate 3 and the housing 1, the input optical fiber is connected with the optical fiber coil 4, the output optical fiber is connected with the optical fiber coil 4, a threaded guide post 5 is disposed between the housing 1, the optical fiber coil 4 and the sliding plate 3, one end of the threaded guide post 5 extends out of the housing 1 and is connected with the knob 2, the knob 2 drives the sliding plate 3 to move toward the optical fiber coil 4 through the threaded guide post 5 so as to generate an extrusion stress on the optical fiber coil 4, thereby, which uses the bending loss principle of the fiber coil 4 to achieve attenuation.

Specifically, the housing 1 includes a top fixing support 11 and a bottom fixing baffle 12 made of metal, the knob 2 is disposed on the top fixing support 11, the sliding plate 3 is movably disposed on the bottom fixing baffle 12, and the optical fiber coil 4 is sandwiched between the top fixing support 11 and the sliding plate 3.

The sliding plate 3 is a metal sliding plate, the maximum downward sliding distance of the sliding plate 3 can be limited by the bottom fixed baffle 12, the middle threaded guide post 5 is a cylindrical threaded metal guide post used as a guide rail of the sliding plate 3, a nut is embedded at a certain position of the guide rail, the position of the nut determines the maximum upward distance of the sliding plate 3, and the maximum attenuation amplitude of the adjustable attenuator is also limited. Preferably, the nut is located on a section of the threaded guide post 5 near the knob 2. Through the arrangement of the screw cap, the maximum attenuation upper limit can be adjusted while the attenuation power is attenuated. The nut also serves to cushion the slide plate 3 against the unrestricted twisting of the knob 2 during use, so that the central fiber coil 4 is broken by the unsustainable compressive stresses and serves to protect the bending-active fiber.

Furthermore, two limiting columns 6 are symmetrically arranged on the sliding plate 3, the two limiting columns 6 are located on two sides of the optical fiber coil 4, and the heights of the two limiting columns 6 are equal and smaller than the width of the optical fiber coil 4. The maximum bending degree of the optical fiber coil 4 can be limited through the action of the limiting columns 6, and a protection effect is provided.

The optical fiber coil 4 is a circular bending sensitive single-mode optical fiber coil. The principle of bending loss of the optical fiber is utilized, and different attenuation is achieved according to different bending radiuses, so that the bending insensitive single-mode optical fiber cannot be used.

The top fixing bracket 11 is an L-shaped three-dimensional structural member, and the inner side surface of the top fixing bracket is provided with a position for limiting the input optical fiber and the output optical fiber so as to place the input optical fiber and the output optical fiber. The input optical fiber and the output optical fiber are respectively arranged at the left side and the right side of the shell 1.

Because the single-mode optical fiber is small and fragile, the input optical fiber and the output optical fiber need to be sheathed with the optical cable protective sleeve 7. The optical cable protective sleeve 7 is fixed on the top fixing support 11 through strong glue. It should be noted here that the fiber coil 4 cannot be fixed by strong glue, and can only be kept from drifting by the stress generated by the top fixing bracket 11 and the sliding plate 3.

Preferably, the periphery of the knob 2 is provided with anti-skid lines. Facilitating the rotational operation of the knob 2.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An adjustable optical attenuator, characterized by: the optical fiber cable comprises a shell with a cavity structure, a knob arranged on the shell, and an input optical fiber and an output optical fiber which extend into the shell from the outer side of the shell, wherein a sliding plate is movably arranged in the shell, an optical fiber coil is clamped between the sliding plate and the shell, the peripheral side of the optical fiber coil is abutted against the sliding plate and the shell, the input optical fiber is connected with the optical fiber coil, the output optical fiber is connected with the optical fiber coil, a threaded guide post penetrates through the shell, the optical fiber coil and the sliding plate, one end of the threaded guide post extends out of the shell and is connected with the knob, and the knob drives the sliding plate to move towards the optical fiber coil through the threaded guide post so as to generate extrusion stress on the optical fiber coil.

2. The adjustable optical attenuator of claim 1, wherein: and a nut is embedded in one section of the threaded guide post, which is close to the knob, and the maximum moving distance of the sliding plate to the optical fiber coil is limited by the nut.

3. The adjustable optical attenuator of claim 1, wherein: the optical fiber coil is a circular bending sensitive single-mode optical fiber coil.

4. The adjustable optical attenuator of claim 1, wherein: the sliding plate is symmetrically provided with two limiting columns, the two limiting columns are located on two sides of the optical fiber coil, and the heights of the two limiting columns are equal and smaller than the width of the optical fiber coil.

5. The adjustable optical attenuator of claim 1, wherein: the shell comprises a top fixing support and a bottom fixing baffle, the knob is arranged on the top fixing support, the sliding plate is movably arranged on the bottom fixing baffle, and the optical fiber coil is clamped between the top fixing support and the sliding plate.

6. The variable optical attenuator of claim 5, wherein: the top fixing support is an L-shaped three-dimensional structural member, and the inner side surface of the top fixing support is provided with a position for limiting the input optical fiber and the output optical fiber so as to place the input optical fiber and the output optical fiber.

7. The adjustable optical attenuator of claim 6, wherein: the input optical fiber and the output optical fiber are respectively arranged at the left side and the right side of the shell.

8. The adjustable optical attenuator of claim 6, wherein: and the input optical fiber and the output optical fiber are sleeved with optical cable protective sleeves.

9. The variable optical attenuator of claim 8, wherein: the optical cable protective sleeve is fixed on the top fixing support through strong glue.

10. The adjustable optical attenuator of claim 1, wherein: the periphery of the knob is provided with anti-skid grains.