CN2650159Y - Tuneable optical fiber grating division-plugging multiplexer - Google Patents

Abstract

A mechanically adjustable adjustable optical attenuator, which is composed of a housing, a beam blocking device and a collimator. The housing is installed with a conduit passing through it longitudinally, and a collimator is installed at each end of the conduit. The collimator It is connected with the external optical fiber, and there is an attenuation cavity between the two collimators. The beam blocking device is inserted into the attenuating cavity. The beam blocking device has a tail end, a thorn-shaped front end and a thorn-shaped front end extending from the tail end to the thorn-like front end. The concave curved light blocking surface, the light beam blocking device is firmly connected with a guide rod extending along the transverse direction at the tail end. The guide rod body is installed in the transverse guide hole passing through the shell. On the other end of the guide rod body opposite to the light beam blocking device, an external coupling part firmly connected with it is arranged. The central axis of the beam blocking device is perpendicular to the propagating direction of the attenuated beam. The degree to which the beam blocking device blocks the beam is varied by moving the beam blocking device in and out of the beam. The quasi-conical shape of the inner curved surface of the beam blocking device can make the device of a certain size have higher attenuation precision.

Description

A Mechanically Adjustable Dimmable Optical Attenuator

Technical field:

The utility model relates to an optical device, in particular to an optical attenuator, in particular to a mechanically adjustable adjustable optical attenuator.

Background technique:

In the prior art, light-blocking attenuators are used to attenuate light beams in optical systems such as optical fiber communication systems. The light-blocking attenuators block part of the light beams by inserting light-blocking devices in the optical path. The light-blocking attenuators can be used at wavelengths It works in an uncorrelated and polarization-independent way, and has high reliability and high repeatability. The light-blocking attenuator has a large attenuation range and is relatively easy to manufacture, but the light-blocking attenuator is generally larger in size and , in order to achieve higher precision, the light-blocking attenuator needs to be controlled by micron-level precision machinery.

Invention content:

The technical problem to be solved by the utility model is: in the prior art, the volume of the light-blocking attenuator is generally large, and in order to achieve higher precision, the light-blocking attenuator needs micron-level precision machinery to control . The technical solution adopted by the utility model to solve the above-mentioned technical problems in the prior art is to provide a mechanically adjustable adjustable optical attenuator. The mechanically adjustable adjustable optical attenuator consists of a casing, a beam blocking device and a beam transmission device, wherein the beam blocking device is arranged inside the housing, the beam transmission device is composed of a collimator, a conduit is arranged in the casing, and the conduit passes through Through the shell, a collimator is installed at both ends of the guide tube, the collimator is connected to the external optical fiber, and there is an attenuation cavity between the two collimators , the beam blocking device is inserted into the attenuating cavity, the beam blocking device has a tail end, a thorn-shaped front end and a concave curved light-blocking surface extending from the tail end to the thorn-shaped front end, The tail end of the beam blocking device is connected with a guide rod. A guide rod guide hole is provided in the housing, and the guide rod body is arranged in the guide rod guide hole, and the guide rod body and the guide rod guide hole are connected by thread fit. The other end of the beam blocking device is provided with an external coupling part, and the coupling part and the guide hole constitute a control device associated with the beam blocking device for controlling the lateral movement of the beam blocking device, thereby Change the amount of attenuation of the beam by the beam blocking device. Specifically, the collimator is a self-concentrating lens, or a C-type lens, the shape of the beam blocking device is a quasi-cone with a concave surface on the outside, and the coupling component can be a handle or a knob, etc. The hand control device, the beam blocking device, the guide rod body and the coupling part can be a single piece, or can be composed of a single device and their assembly parts. Further, the guide rod body and the A sealing ring may also be provided between the guide holes to enhance the sealing performance of the optical attenuator and prevent dirt from polluting its internal components.

Compared with the prior art, the utility model has positive and obvious effects. The structure of the utility model is simple and practical, and the control part of the utility model is connected with the blocking device of the light beam, so that the attenuation of the light beam caused by the blocking device of the light beam can be changed. In the utility model, the beam blocker is also provided with a light-blocking curved surface curved inside, thereby achieving better attenuation precision.

Description of drawings:

Fig. 1 is a longitudinal sectional structural schematic diagram of a first preferred embodiment of a mechanically adjustable dimmable optical attenuator of the present invention.

Fig. 2 is a structural schematic diagram of the control part of the second preferred embodiment of a mechanically adjustable dimmable optical attenuator of the present invention.

Fig. 3 is a longitudinal central cross-sectional view of the beam blocking device of the third preferred embodiment of a mechanically adjustable adjustable optical attenuator of the present invention.

Fig. 4 is a lateral perspective view of the beam blocking device of the third preferred embodiment of a mechanically adjustable adjustable optical attenuator of the present invention.

As shown in Figure 1, a mechanically adjustable adjustable optical attenuator of the present invention is composed of a housing 22, a beam blocking device 32 and a beam transmission device, wherein the beam blocking device 32 is arranged on the housing 22, the beam transmission device is composed of a collimator 26, a conduit 24 passing through the casing 22 is provided, and a collimator 24 is installed at both ends of the conduit 24. A collimator 26, the collimator 26 is connected to the external optical fiber 14, an attenuation cavity 30 is arranged between the two collimators 24, and the beam blocking device 32 is inserted into the attenuation cavity 30 Inside, the beam blocking device 32 has a tail end 36, a thorn-like front end 38 and a concave curved light blocking surface extending from the tail end 36 to the thorn-like front end 38, the tail end of the beam blocking device 32 The guide rod body 44 extending in the transverse direction is connected. The guide rod body 44 is installed in the transverse guide hole 34 passing through the housing. The guide rod body 44 is provided with threads, and coincides with the internal thread of the guide hole 34. When the guide rod body 44 rotates in the guide hole 34, the beam blocking device 32 is linear along the trajectory perpendicular to the beam 50. Move laterally. A coupling part 46 is provided at the other end of the guide rod body 44 relative to the beam blocking device 32, and the coupling part 46 and the guide hole 34 form a control device associated with the beam blocking device 32, It is used to control the lateral movement of the beam blocking device 32 so as to change the attenuation of the beam 50 by the beam blocking device 32 . Specifically, the collimator 26 is a self-concentrating lens or a C-type lens, the shape of the beam blocking device 32 is a concave quasi-cone, and the coupling part 46 can be such as a handle or a knob etc., the beam blocking device 32, the guide rod body 44 and the coupling part 46 can be a single piece, or can be composed of a single device and their assembly parts.

In a preferred embodiment of the present invention, the beam blocking device 32, the guide rod body 44 and the external coupling member 46 are composed of a single stainless steel device with a diameter of about 3mm. Housing 22 may be constructed of gold plated brass or other commonly used materials. When the optical attenuator 20 is made, the collimator 26 is installed in the cylindrical tube 24 . Align the collimator 26 with the straight line so that the optical attenuator 20 can obtain the minimum insertion loss, and then weld and fix the optical collimator. The assembly consisting of cylindrical tube 24 and collimator 26 is then mounted in the longitudinal circular hole of housing 22 . Then the components including the beam blocking device 32 , the guide rod body 44 and the coupling component 46 are screwed into the guide hole 34 . High vacuum grease is applied around the thread of the guide rod body 44 to prevent water vapor from entering the cavity 30 and lubricate between the guide rod body 44 and the guide hole 34 . This lubrication facilitates smooth linear movement of the beam blocking device 32 and prevents the beam blocking device 32 from drifting off its axis. The deviation of the linear track of the beam blocking device 32 will change the attenuation produced by the beam blocking device 32 . Finally, the round tube 24 is fixed and sealed in the shell 22 with glue. When adjusting the amount of light attenuation, the user can manually or automatically control the rotation of the guide rod body 44 in the guide hole 34 to make the beam blocking device 32 linearly move along the transverse guide hole. The lateral position of the beam blocking device 32 determines the extent to which the path of the light beam 50 between the input and output collimators 26 is blocked. The moving range of the light beam attenuating device 32, its length, width and concave surface curvature can be designed and determined according to the target to be achieved, that is, the characteristic that the attenuation varies with the lateral movement of the light blocking device.

As shown in Figure 2, in the second embodiment of the present invention, a sealing ring 135 may also be provided between the guide rod body 144 and the guide hole 134 to enhance the sealing of the optical attenuator and prevent Dirt contaminates its internal components.

As shown in FIG. 3 and FIG. 4 , in the third embodiment of the present invention, the beam blocking device has a curved surface 233 facing the beam propagation, and a flat back surface 234 facing away from the beam propagation. The beam blocking device is composed of two parts, one is a concave quasi-conical light blocking surface 358, and the other is a cylindrical light blocking surface 359, and the two light blocking surfaces are connected continuously at the tail end of the light blocking surface 358. On the basis of the rotationally symmetrical shape of the blocking device, the light blocking surface 358 can be obtained by cutting off the rear half and the approximately triangular part in the front. The light blocking surface is bounded by two concave curves that intersect at tip 238 . The longitudinal central section of the light blocking surface 358 is bounded by two straight lines that intersect at the tip 238 . When the beam blocking device is inserted into the beam, it does not rotate around the central axis of the beam attenuator, but only moves linearly and laterally. However, the beam attenuating device can also be rotated to move the inserted beam, and its rotation axis is a transverse axis perpendicular to the direction of the beam, that is, the central axis of the beam attenuating device.

Claims (8)

1. A mechanically adjustable adjustable optical attenuator, which is composed of a housing, a beam blocking device and a beam transmitting device, is characterized in that: the housing is provided with a conduit, and the conduit passes through the housing, The beam transmission device is composed of a collimator, the two ends of the catheter are provided with a collimator, the collimator is connected with an external optical fiber, and the two collimators There is an attenuation cavity between them, and the beam blocking device has a tail end, a thorn-like front end and a concave curved light-blocking surface extending from the tail end to the thorn-like front end, and the beam blocking device is arranged on the The inside of the shell is located in the attenuation cavity, the tail end of the beam blocking device is fixedly connected with a guide rod body, a guide rod guide hole is set in the shell, and the guide rod body is arranged on the In the guide rod guide hole of the guide rod, the guide rod body and the guide rod guide hole are connected by thread fit. 2. The mechanically adjustable dimmable optical attenuator according to claim 1, characterized in that an external coupling part is arranged on the outer end of the guide rod body. 3. The mechanically adjustable adjustable optical attenuator according to claim 1, wherein the collimator is a self-concentrating lens. 4. The mechanically adjustable adjustable optical attenuator according to claim 1, wherein the collimator is a C-type lens. 5. The mechanically adjustable adjustable optical attenuator according to claim 1, wherein the shape of the beam blocking device is a quasi-cone with a concave surface on the outside. 6. The mechanically adjustable adjustable optical attenuator according to claim 1, characterized in that: the beam blocking device, the guide rod body and the coupling part are an integral component. 7. The mechanically adjustable adjustable optical attenuator according to claim 1, wherein the beam blocking device, the guide rod body and the coupling part are composed of three independent components. 8. The mechanically adjustable dimmable optical attenuator according to claim 1, wherein a sealing ring is arranged between the guide rod body and the guide rod guide hole.

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