Background
The existing optical fiber connection is realized by adopting a movable connection mode. Firstly, determining the type of the optical fiber head, customizing an optical fiber jumper wire with enough length, ensuring that the types of the optical fiber heads at two ends are matched, and adding an optical fiber adapter (also called an optical fiber coupler and a flange plate) and ensuring that the optical fiber adapter is matched with the types of the optical fiber heads.
The following problems exist in the use process of the existing optical fiber connector:
1. when the existing connector is in butt joint, the end face of the connector is extruded when the optical fiber connecting threaded sleeve is screwed, and certain stress is generated. When light is transmitted, high-power energy gathers, which can cause the fiber core to be burnt out by high-power laser and can not withstand multiple plugging and reassembly
2. In the optical fiber butt joint operation process, grease on the hands of operators and dust in the air pollute the end face of the optical fiber.
3. The optical fiber adapter is used for enabling the butt-jointed optical fibers to be exposed to certain air for a long time, dust accumulation or moist air can be generated on the surfaces of the butt-jointed optical fibers, connection loss can be increased, surface scratches are generated, fiber cores can be blocked when severe, light cannot be transmitted, and even the fiber cores can be burnt out by high-power laser when severe.
The utility model patent CN201420337445.4 discloses a double-optical fiber connector, and particularly discloses a double-optical fiber connector which comprises an optical fiber connector body and an optical fiber locking nut, and is characterized in that the optical fiber connector body and the optical fiber locking nut are connected through threads, two optical fiber jacks for fixing optical fibers are arranged in the optical fiber connector body, and two separate clamping blocks are arranged on two sides of the head of the optical fiber connector body; the inside of optic fibre lock nut is equipped with interior conical surface, when the optical fiber connector body with optic fibre lock nut is connected, the clamp block receives the inside shrink of extrusion of interior conical surface is in order to centre gripping the optic fibre that is arranged in the optic fibre jack. The optical fiber connector adopts a thread locking mode, and the extrusion stress of the connector is large during butt joint, so that the problem of burning and melting easily occurs during passing.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides an optical fiber connector which can be used for reducing the extrusion stress of the connector when the high-power optical fiber connector is in butt joint, so that the connector is light-transmitting and does not burn; the surface transmittance of light is increased, and the coupling efficiency is improved.
The utility model is realized by the following technical scheme:
the utility model provides an optical fiber connector, which comprises an optical fiber ceramic head, an optical fiber lantern ring, an optical fiber connecting thread sleeve, a spring and an optical fiber tail sleeve; the spring is used for being sleeved outside the optical fiber which extends out of the optical fiber tail sleeve and sequentially passes through the optical fiber sleeve ring and the optical fiber ceramic head; the optical fiber connecting thread sleeve is sleeved outside the optical fiber sleeve ring and the optical fiber ceramic head and is used for being connected with an adapter, so that the spring acts between the optical fiber tail sleeve and the optical fiber sleeve ring; the optical fiber ceramic head is fixed on the optical fiber lantern ring.
Preferably, the spring has an elastic coefficient of 1.698-2.548N/mm.
Preferably, the optical fiber ceramic head is an optical fiber ceramic head with the length of 7.93-7.97 mm.
Preferably, the optical fiber lantern ring comprises a lantern ring body, a bulge arranged outside the lantern ring body, and a card arranged outside the lantern ring body and on the end face of the bulge facing the direction of the adapter.
Preferably, the fiber optic connector further comprises an adapter; the adapter comprises an outer shell, two inner insertion tubes arranged on opposite sides of the outer shell, and an outer insertion tube arranged on the outer side of the inner insertion tube; the inner insertion tube is communicated with the outer shell; the inner insertion tube is used for inserting the optical fiber ceramic head, the space between the inner insertion tube and the outer insertion tube is used for accommodating the lantern ring body, and the lantern ring body is abutted against the bottom surface of the space between the inner insertion tube and the outer insertion tube; the outer cannula is provided with a clamping groove matched with the clamping piece in a clamping way.
Preferably, an elastic silica gel sleeve with a pinhole is arranged in the outer shell, and the opening of the pinhole is arranged corresponding to the inner insertion tube.
Preferably, an elastic silica gel pad contacting with the optical fiber ceramic head is arranged on the bottom surface of the space between the inner insertion tube and the outer insertion tube.
Preferably, the optical fiber matching liquid is accommodated in the outer housing.
Preferably, the fiber optic connector is adapted for use with a FC, ST, SC, PC, APC, MT-RT connector.
Preferably, the end face of the optical fiber ceramic head is coated with an antireflection film.
The utility model has the following beneficial effects:
according to the optical fiber connector, the spring with small elastic coefficient, the optical fiber ceramic head with shorter size and the elastic silica gel gasket are arranged, so that the distance between the end faces of the optical fiber ceramic head is suitable for coupling without generating stress; the optical fibers in the optical fiber matching liquid are in butt joint, can bear high-power laser, can clean the end face, fill the gap of a connecting point, reduce Fresnel reflection, reduce friction force generated by the original installation, enable the optical fibers to work in wet and high-low temperature environments, and can withstand repeated plugging and reassembling.
Detailed Description
The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.
Referring to fig. 1, the optical fiber connector comprises an optical fiber ceramic head 1, an optical fiber lantern ring 2, an optical fiber connecting thread sleeve 4, a spring 5, an optical fiber tail sleeve 6 and an adapter. The spring 5 is used for being sleeved outside the optical fiber 3 which extends out from the optical fiber tail sleeve 6 and sequentially passes through the optical fiber lantern ring 2 and the optical fiber ceramic head 1. The optical fiber connection thread sleeve is sleeved outside the optical fiber sleeve ring and the optical fiber ceramic head and is used for being connected with an adapter, so that the spring 5 acts between the optical fiber tail sleeve 6 and the optical fiber sleeve ring 2. The optical fiber ceramic head 1 is fixed on the optical fiber lantern ring 2.
The optical fiber tail sleeve 6 is made of a waterproof rubber sleeve, and a step part is arranged at one end, connected with the optical fiber connecting thread sleeve 4, of the optical fiber tail sleeve 6. The upper step surface of the step part is used for abutting the end part of the spring, and the lower step surface of the step part is used for abutting the optical fiber connecting thread bush.
In order to reduce stress generated by end face extrusion when the connector is screwed up with the optical fiber connecting threaded sleeve, on one hand, the spring adopts a spring with the elastic coefficient of 1.698-2.548N/mm. According to the elastic coefficient calculation formula:
wherein F: the load of the spring; lambda: the amount of deformation of the spring when loaded F; g: shear modulus of the spring material; d: spring wire diameter; d2: the diameter of the spring; n: the effective number of turns of the spring; c: the spring's turn ratio (also known as the spring index).
It is known that increasing the diameter of the spring, decreasing the diameter of the spring wire, changing to a smaller shear modulus spring material, increasing the effective number of turns of the spring, a larger winding ratio, etc., results in a smaller spring rate. The spring with smaller elastic coefficient can reduce the extrusion stress of the end face to the point that high-power light is passed through so as not to generate burning.
On the other hand, a shorter suitable ceramic fiber optic head is selected so that the end face distance is suitable for coupling without creating excessive stress. For example, a fiber ceramic head with a length of 7.93-7.97 mm is used.
The optical fiber ceramic head can be fixed on the optical fiber lantern ring 2 through a metal fixing piece. One end of the metal fixing piece is clamped and fixed on the metal optical fiber lantern ring, and the other end of the metal fixing piece is used for clamping and fixing the optical fiber ceramic head. In this way, the fibre ceramic head can be easily secured to the fibre collar 2. Specifically, the metal fixing piece is provided with a small circular ring part sleeved in the optical fiber lantern ring and a large circular ring part used for clamping the optical fiber ceramic head. The radial dimension of the small circular ring part is smaller than that of the large circular ring part, and the small circular ring part and the large circular ring part are integrally formed.
The optical fiber lantern ring 2 adopts a metal lantern ring and comprises a lantern ring body 21, a protrusion 22 arranged outside the lantern ring body 21 and a clamping piece 23 arranged outside the lantern ring body 21 and on the end face of the protrusion 22 facing the direction of the adapter. The optical fiber collar 2 can be fixed on the optical fiber tail sleeve 6 by an adhesive mode.
When the optical fiber ceramic head is inserted into the adapter, the optical fiber lantern ring 2 is matched with the adapter in a positioning way, and then the adapter is fixed by utilizing an optical fiber connecting thread sleeve.
The adapter comprises an outer housing 7, two inner cannulas 8 arranged on opposite sides of the outer housing 7, and an outer cannula 9 arranged outside the inner cannula. The inner cannula 8 communicates with the outer housing 7. The inner insertion tube 8 is used for inserting the optical fiber ceramic head 1, the space between the inner insertion tube 8 and the outer insertion tube 9 is used for accommodating the collar body 22, the collar body 22 is abutted against the bottom surface 10 of the space between the inner insertion tube 8 and the outer insertion tube 9, and the protrusion 22 is abutted against the end part of the outer insertion tube 9. The outer insertion tube 9 is provided with a clamping groove 91 which is matched with the clamping piece 23 in a clamping way. Preferably, the card slot 91 is a U-shaped slot, and the card 23 has a shape matching the U-shaped slot.
The distance between the end surfaces is further reduced, and an elastic silica gel pad which is contacted with the optical fiber ceramic head 1 is arranged on the bottom surface 10 of the space between the inner insertion tube 8 and the outer insertion tube 9. The elastic silica gel pad is connected with the bottom surface 10 in an adhesive manner. The sealing effect that is favorable to avoiding because of the too free sealed effect that leads to of elasticity silica gel pad activity is poor problem, improves sealed reliability.
The outer housing 7 contains an optical fiber matching liquid 11. The optical fiber matching liquid is a soft, non-adhesive, water-blocking, nontoxic, harmless and crystal clear pasty compound, and the refractive index of the optical fiber matching liquid is close to that of the optical fiber. After the optical fiber matching liquid is added, the method has the following advantages:
1. when the optical fibers are in butt joint, the optical fiber matching liquid can clean the end face, so that grease on hands and dust in air can be taken away to pollute the end face. The labor and material resources for cleaning the end face can be reduced.
2. In the optical fiber matching liquid, the optical fibers are in butt joint, and compared with the direct butt joint in the air, the diffusion angle and the coupling angle of the emergent light of the optical fibers can be reduced, so that better coupling efficiency is achieved.
3. The gap of the connecting point can be filled, fresnel reflection can be reduced, and particularly when the end face of the optical fiber is uneven, the matching liquid is filled in the continuous connecting point, so that the light efficiency can be effectively improved.
4. The lubricant can be used as a lubricant, so that friction force generated by the original installation can be reduced, damage to the end face of the optical fiber can be reduced, and the installation efficiency and the success rate of butt joint are improved.
In order to prevent the matching liquid from leaking out when the optical fiber ferrule enters the matching liquid, an elastic silica gel sleeve 13 with a pinhole is arranged in the outer shell 7, and the pinhole opening 131 is arranged corresponding to the inner insertion tube. The elastic silica gel sleeve 13 is sheet-shaped, and can be planar sheet-shaped or curved sheet-shaped. The elastic silica gel sleeve can be connected with the inner side wall of the outer shell 7 in an adhesive mode. Or, the elastic silica gel sleeve is formed with an inner cavity, and the optical fiber matching liquid 11 is distributed in the inner cavity. The elastic silica gel sleeve is a sleeve-shaped body with a pinhole opening, and two pinhole openings are respectively arranged corresponding to the inner inserting tubes at two sides of the outer shell.
The fiber optic connector is suitable for use in FC, ST, SC, PC, APC, MT-RT connectors. For this purpose, the adapter has a connection opening adapted to the fiber optic connector. Because the adapter is provided with the connectors of the two groups of inner sleeve pipe and outer sleeve pipe combinations respectively at the two opposite sides of the outer shell body, the two sides of the outer shell body of the adapter can be connected with different types of optical fiber connectors respectively or the same type of optical fiber connectors.
The end face of the optical fiber ceramic head is coated with an antireflection film 12. The antireflection film is a surface optical coating, which increases the transmittance of light on the surface by reducing the reflected light, and improves the coupling efficiency.
Taking FC joint docking as an example:
when the optical fiber ceramic head 1 is inserted into the adapter, the optical fiber ceramic head enters the silica gel sleeve pinhole opening 131 (the opening above the figure 4), the optical fiber matching liquid 11 fills the optical fiber ceramic head 1, and the optical fiber matching liquid 11 takes away end face dust and other foreign matters. The process continues until the clamping piece 23 of the optical fiber lantern ring 2 is matched with the U-shaped clamping groove 91 of the optical fiber adapter, the metal lantern ring 22 is touched with the bottom surface 10, the optical fiber is limited to be at a certain position, the optical fiber connecting threaded sleeve 4 is matched and screwed with the optical fiber connecting threads 14, at the moment, the elastic spring 5 on the FC connector is compressed, the optical fiber ceramic head 1 is guaranteed to be butted, the elasticity is reduced, the optical fiber head is butted but not extruded, the optical fiber connector is screwed on the optical fiber connecting threads 14, and the optical fiber is butted.
When light is transmitted, the light passes through the optical fiber matching liquid 11, and the end surface extrusion stress is reduced to the point that high-power light is transmitted, so that burning and melting cannot occur; the optical fiber ceramic head end face 1 is coated with an antireflection film 12, so that the coupling efficiency is improved.
It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.