CN219268128U

CN219268128U - Coaxial laser assembly capable of detachably mounting optical isolator with different angles

Info

Publication number: CN219268128U
Application number: CN202320871606.7U
Authority: CN
Inventors: 付树阶; 梁方方
Original assignee: Wuhan Borites Optical Fiber Sensing Technology Co ltd
Current assignee: Wuhan Borites Optical Fiber Sensing Technology Co ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2023-06-27
Anticipated expiration: 2033-04-17

Abstract

A coaxial laser assembly for removably mounting optical unidirectional devices at different angles, comprising: the laser, the optical fiber coupling adapter and the PCB substrate are connected, and the laser and the optical fiber coupling adapter are both arranged on the PCB substrate, a metal shell is arranged on the outer surface of the laser and the outer surface of the optical fiber coupling adapter, a mounting groove is formed in the upper surface of the metal shell, a bayonet is arranged in the middle position inside the laser and the optical fiber coupling adapter, the mounting groove comprises a first mounting groove, a second mounting groove and a third mounting groove, and the inclination angles of the notches of the first mounting groove, the second mounting groove and the third mounting groove are respectively 4 degrees, 6 degrees and 8 degrees; the fiber coupling adapter includes a metal sleeve, a ceramic sleeve, and a fiber-free ferrule. According to the utility model, by improving the structure of the coaxial laser component, the optical isolator is inserted into different mounting grooves, so that different included angles are formed between the optical isolator and laser beams, and the interference of reverse light on the laser chip is avoided, thereby achieving the effect of reducing nonlinear distortion of the laser.

Description

Coaxial laser assembly capable of detachably mounting optical isolator with different angles

Technical Field

The utility model particularly relates to a coaxial laser component capable of detachably mounting optical unidirectional devices with different angles.

Background

A coaxial laser assembly is an indispensable component of an optical communication system and a measurement system. The coaxial laser assembly consists of a TO-CAN laser and an optical fiber coupling adapter which are arranged in a metal tube seat. The optical fiber interface of the optical fiber coupling adapter and the fiber core end face of the optical fiber connector of an external communication system need to be precisely optically aligned and can be repeatedly plugged and unplugged for a plurality of times, so that the optical fiber coupling adapter has higher requirements on the structure of the optical fiber coupling adapter and is an important component of the cost of the whole coaxial laser assembly.

With this is an increasing demand for the anti-interference capability of the lasers. The most important thing for analog lasers is the stability and reliability of the transmitted signal, i.e. what we commonly call background noise, light reflection, CSO/CTB, which in turn is particularly important as an indicator of nonlinear distortion (CSO/CTB). A solution currently in use in the market is to add an optical isolator between the laser and the fiber coupling adapter to prevent reverse light from entering the laser chip. The free space isolator has the function of unidirectional transmission, so that the optical fiber reverse light entering into a laser chip can be effectively reduced, the distortion degree of nonlinear distortion of the laser can be reduced, the existing optical isolator is single in fixing direction, the included angle between the optical isolator and a laser beam is fixed, and the change of the included angle of the optical isolator is inconvenient to carry out.

Disclosure of Invention

In view of the foregoing, the present utility model provides a coaxial laser assembly detachably mounted with optical unidirectional devices of different angles, so as to solve the problems set forth in the background art.

The technical scheme adopted for solving the technical problems is as follows: there is provided a coaxial laser assembly for detachably mounting optical unidirectional devices at different angles, comprising: the laser with the cap lens, the optical fiber coupling adapter and the PCB substrate are arranged in the metal tube seat, the laser with the cap lens further comprises an optical isolator used for preventing reverse light from entering the laser chip, the laser is connected with the optical fiber coupling adapter and is arranged on the PCB substrate, a metal shell is arranged on the outer surface of the laser and the outer surface of the optical fiber coupling adapter, a plurality of mounting grooves used for detachably mounting the optical isolator are formed in the upper surface of the metal shell, a bayonet used for fixing the optical isolator is arranged in the middle position inside the laser and the optical fiber coupling adapter, the mounting grooves comprise a first mounting groove, a second mounting groove and a third mounting groove, the notch inclination angles of the first mounting groove, the second mounting groove and the third mounting groove are respectively 4 degrees, 6 degrees and 8 degrees, and the optical isolator is inserted into the first mounting groove, the second mounting groove and the third mounting groove and respectively forms included angles of 4 degrees, 6 degrees and 8 degrees with laser beams of the laser; the optical fiber coupling adapter comprises a metal sleeve, a ceramic sleeve and a fiber-free insert core, wherein the ceramic sleeve is inserted into the metal sleeve to be assembled in a tight fit manner or fixed by glue, and a conical light-passing hole is formed in the center of the fiber-free insert core; when the optical isolator is used, the optical isolator is inserted into different mounting grooves, so that different included angles are formed between the optical isolator and laser beams, interference of reverse light to a laser chip is avoided, and the effect of reducing nonlinear distortion of the laser is achieved.

In this embodiment, the diameter of the small hole of the tapered light-passing hole is larger than the diameter of the fiber core of the optical fiber connector; the plug force between the adapter and the optical fiber connector can be well ensured.

In this embodiment, the fiber-free ferrule insert is secured with glue.

In this embodiment, the large hole of the tapered light-passing hole is adjacent to the cap lens of the laser, and when the laser is coupled to the optical fiber coupler adapter and the optical isolator for alignment adjustment, the focal point of the cap lens is located at the center of the small hole of the tapered light-passing hole.

In this embodiment, the cap lens is a spherical lens or a planar lens.

In this embodiment, the aperture diameter of the tapered light-passing hole

In this embodiment, the fiber-free ferrule is a metal or ceramic material.

The beneficial effects of the utility model are as follows: according to the coaxial laser assembly, the structure of the coaxial laser assembly is improved, after the common optical isolator is detachably packaged in the assembly, a proper included angle is formed between the light incident plane and incident light, the optical isolator is inserted into different mounting grooves, different included angles are formed between the optical isolator and laser beams, and interference of reverse light on a laser chip is avoided, so that the effect of reducing nonlinear distortion of the laser is achieved.

Drawings

Fig. 1 is a schematic view of a structure in which an optical isolator is inserted in a first mounting groove.

Fig. 2 is a partial enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic view of the structure of the optical isolator inserted in the second mounting groove.

Fig. 4 is a partial enlarged view of a portion B in fig. 3.

Fig. 5 is a schematic view of the structure of the optical isolator inserted in the third mounting groove.

Fig. 6 is a partial enlarged view of a portion C in fig. 5.

In the figure, 1, a laser; 2. a fiber optic coupling adapter; 3. a PCB substrate; 4. a metal housing; 5. an optical isolator; 6. a first mounting groove; 7. a second mounting groove; 8. a third mounting groove; 9. a metal sleeve; 10. a ceramic sleeve; 11. no optical fiber ferrule; 12. tapered light-passing holes.

Detailed Description

The utility model will be further described with reference to the drawings and some embodiments.

In fig. 1-6, there is provided a coaxial laser assembly for detachably mounting different angle optical isolator 5, comprising: the laser device 1, the optical fiber coupling adapter 2 and the PCB substrate 3 which are arranged in the metal tube seat and provided with the tube cap lens, and further comprise an optical isolator 5 used for preventing reverse light from entering the laser chip, wherein the laser device 1 and the optical fiber coupling adapter 2 are connected and are arranged on the PCB substrate 3, a metal shell 4 is arranged on the outer surfaces of the laser device 1 and the optical fiber coupling adapter 2, a plurality of mounting grooves used for detachably mounting the optical isolator 5 are formed in the upper surface of the metal shell 4, bayonets used for fixing the optical isolator 5 are arranged in the middle positions inside the laser device 1 and the optical fiber coupling adapter 2, the mounting grooves comprise a first mounting groove 8, a second mounting groove 8 and a third mounting groove 8, the notch inclination angles of the first mounting groove 8, the second mounting groove 8 and the third mounting groove 8 are respectively 4 DEG, 6 DEG and 8 DEG, and the optical isolator 5 is inserted into the first mounting groove 8, the second mounting groove 8 and the third mounting groove 8 DEG form included angles of 4 DEG and 6 DEG and 8 DEG respectively with laser beams of the laser device 1; when the light isolator is used, after the common light isolator 5 is detachably packaged in the assembly, a proper included angle is formed between the light incidence plane and incident light, and when the light isolator 5 is inserted into the first mounting groove 6, an included angle of 4 degrees is formed between the light isolator 5 and the light beam of the laser 1; when the optical isolator 5 is inserted into the second mounting groove 7, an included angle of 6 degrees is formed between the optical isolator 5 and the light beam of the laser 1; when the optical isolator 5 is inserted into the third mounting groove 8, an included angle of 8 degrees is formed between the optical isolator 5 and the light beam of the laser 1, the included angle between the optical isolator 5 and the light beam of the laser 1 can be adjusted, the change of the included angle of the optical isolator 5 is convenient, the interference of reverse light on the chip of the laser 1 is avoided greatly, the effect of reducing the nonlinear distortion of the laser 1 is achieved, and the structure is simple to process, convenient to operate and low in cost; in the actual production process, the inclination angle of the notch of the mounting groove can be adjusted, so that a proper included angle is formed between the optical isolator 5 and the light beam of the laser 1, and details are omitted here.

In this embodiment, the optical fiber coupling adapter 2 includes a metal sleeve 9, a ceramic sleeve 10 and a fiber-free ferrule 11, where the ceramic sleeve 10 is inserted into the metal sleeve 9 to be assembled in a tight fit or fixed by glue, and a tapered light-transmitting hole 12 is provided in the center of the fiber-free ferrule 11; the diameter of the small hole of the conical light-passing hole 12 is larger than the diameter of the fiber core of the optical fiber connector;the non-optical fiber ferrule 11 is inserted into the ceramic sleeve 10 and fixed by glue; the large hole of the conical light-passing hole 12 is adjacent to the cap lens of the laser 1, and when the laser 1, the optical fiber coupling adapter 2 and the optical isolator 5 are coupled and aligned for adjustment, the focal point of the cap lens is positioned at the center of the small hole of the conical light-passing hole 12; the tube cap lens is a spherical lens or a plane lens; small hole diameter of the tapered light passing hole 12

The no-fiber ferrule 11 is made of metal or ceramic material; when the coaxial laser device is used, the emitted light of the laser device 1 is transmitted through the pipe cap lens and the surface of the light-in-plane wave plate of the light isolator 5, most of the light is transmitted through the light isolator 5 and is coupled to the big hole of the conical light-passing hole 12, the focus is positioned at the center of the small hole and is coupled and output by the fiber core end face of the external fiber connector, little light is reflected by the surface of the light-in-plane wave plate, the reflected light deviates from the original path and is reflected to the outside of the chip from the path because the light-in-plane wave plate has a proper included angle, the interference of the reverse light on the laser device 1 chip is avoided, the nonlinear distortion effect of the laser device 1 is reduced, the requirement on the adapter assembly process is also reduced because no fiber core 11 is adopted, the material cost and the process assembly cost are reduced, the plugging force between the structure adapter and the fiber connector can be well ensured, the plugging repeatability is better, and the optical path stability of the coupling output of the whole coaxial laser device 1 assembly is better.

The optical isolator 5 is characterized in that: the optical isolator 5 is also called an optical isolator, is an optical passive device for optical nonreciprocal transmission, has a function of unidirectional transmission, and can effectively reduce the incidence of optical fiber reverse light into a laser chip, so that the distortion degree of nonlinear distortion of the laser 1 can be reduced.

The utility model is implemented in particular: when the optical isolator is used, after the common optical isolator 5 is detachably packaged in the component, a proper included angle is formed between the light incidence plane and the incident light, the optical isolator 5 is inserted into a corresponding mounting groove according to actual production conditions, the emitted light of the laser 1 passes through a pipe cap lens of the optical isolator and the surface of a light-in-plane wave plate of the optical isolator 5, most of the light is transmitted to the large hole of the conical light-through hole 12 through the optical isolator 5, the focus is positioned in the center of the small hole and is output by the coupling of the end face of a fiber core of an external fiber connector, little light is reflected by the surface of the light-in-plane wave plate, the reflected light deviates from an original path due to the proper included angle of the light-in-plane wave plate, the reflected light is reflected from the path to the outside of the chip, and the interference of the reverse light on the chip of the laser 1 is avoided, so that the nonlinear distortion effect of the laser 1 is reduced, the requirements on the assembly process of the adapter are also reduced due to the fact that the optical fiber-free inserting core 11 is adopted, the material cost and the process assembly cost are reduced, the inserting and pulling force between the structure adapter and the fiber connector can be well ensured, and the coaxial connector is better in the stability of the coupling of the whole laser component 1.

Noteworthy are: in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection, and the specific meaning of the terms above in the present utility model may be understood by those of ordinary skill in the art according to the specific circumstances.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles, comprising: install in metal tube socket in take laser instrument, fiber coupling adapter and PCB base plate of tube cap lens, its characterized in that: the laser is connected with the optical fiber coupling adapter and is arranged on the PCB substrate, a metal shell is arranged on the outer surface of the laser and the outer surface of the optical fiber coupling adapter, a plurality of mounting grooves for detachably mounting the optical fiber isolator are formed in the upper surface of the metal shell, a bayonet for fixing the optical fiber isolator is formed in the middle position inside the laser and the optical fiber coupling adapter, the mounting grooves comprise a first mounting groove, a second mounting groove and a third mounting groove, the notch inclination angles of the first mounting groove, the second mounting groove and the third mounting groove are respectively 4 degrees, 6 degrees and 8 degrees, and the optical fiber isolator is inserted into the first mounting groove, the second mounting groove and the third mounting groove and respectively forms included angles of 4 degrees, 6 degrees and 8 degrees with laser beams of the laser;

the optical fiber coupling adapter comprises a metal sleeve, a ceramic sleeve and a fiber-free insert core, wherein the ceramic sleeve is inserted into the metal sleeve to be assembled in a tight fit mode or fixed by glue, and a conical light through hole is formed in the center of the fiber-free insert core.

2. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles as recited in claim 1, wherein: the diameter of the small hole of the conical light-passing hole is larger than the diameter of the fiber core of the optical fiber connector.

3. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles as recited in claim 1, wherein: the non-optical fiber ferrule is inserted into the ceramic sleeve and fixed by glue.

4. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles as recited in claim 1, wherein: and the large hole of the conical light-passing hole is adjacent to the cap lens of the laser, and when the laser is coupled with the optical fiber coupling adapter and the optical isolator for alignment adjustment, the focal point of the cap lens is positioned at the center of the small hole of the conical light-passing hole.

5. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles as recited in claim 1, wherein: the tube cap lens is a spherical lens or a planar lens.

6. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles as recited in claim 1, wherein: the diameter of the small hole of the conical light-passing hole

7. A coaxial laser assembly for removably mounting optical unidirectional devices at different angles as recited in claim 1, wherein: the optical fiber-free ferrule is made of metal or ceramic materials.