Optical structure of receiving end of optical module

Abstract

The utility model discloses an optical module receiving end optical structure, which comprises a lens body and an insertion core body, the lens body is arranged at the front end of the insertion core body and is in insertion fit with the insertion core body, a plurality of PD chips are arranged below the lens body, the insertion core body is provided with a plurality of optical fiber insertion holes for insertion of optical fibers, and the optical fiber insertion holes are communicated with the PD chips. The front end face of the ferrule body is an inclined plane with the top protruding forwards, the front end face of the optical fiber is flush with the front end face of the ferrule body, the rear end of the lens body is provided with a rear notch, the bottom of the rear notch is provided with a plurality of rear lens parts, the rear lens parts are aligned with the end faces of the optical fiber one by one, and the lens body comprises a total reflection face. A plurality of lower lens parts are arranged on the lens body below the total reflection surface, the lower lens parts are in one-to-one correspondence with the PD chips, optical signals emitted by the optical fiber penetrate through the rear lens parts and are transmitted to the total reflection surface, and the optical signals reflected by the total reflection surface penetrate through the lower lens parts and are transmitted to the PD chips. According to the utility model, the return loss can be effectively increased, the structure is simple, and the cost can be saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical signal transmission device especially relates to a kind of optical module receiving end optical structure. BACKGROUND

[0002] Optical signal transmission device as laser communication device, it is usually applied in high-speed optical module, belong to the core component of optical communication system, its optical path schematic diagram as Figure 7 Shown, working principle is: laser that optical fiber transmission collimates after passing through plastic lens or glass lens again reflection, then focus and hit on optical receiving PD chip, PD chip and electric chip again convert optical signal into electrical signal, then carry out signal analysis, to realize the reception of optical signal. However, the existing optical transmission device has the following defects: first, the echo loss of this kind of optical module is small, and the bit error rate of optical module is too high, which leads to easy packet loss in communication process;At the same time, the reflectivity of chip surface is high, and the reflectivity of chip surface cannot be directly measured, which is not conducive to production control;In addition, the current optical module structure needs two pieces of processed glass to press a plurality of optical fibers, then point glue is fixed, and then grinds and processes, and the complex process leads to high product cost. UTILITY MODEL CONTENT

[0003] The technical problem to be solved by the utility model is to provide an optical module receiving end optical structure that can effectively increase echo loss, is simple in structure and saves cost in view of the deficiencies of the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme.

[0005] An optical module receiving end optical structure includes a lens body and a ferrule body, the lens body is arranged at the front end of the ferrule body and the two are inserted and matched, a plurality of PD chips are arranged below the lens body, a plurality of optical fiber insertion holes for inserting optical fibers are formed in the ferrule body, the front end surface of the ferrule body is a top forward convex inclined plane, the front end surface of the ferrule body is flush with the front end surface of the ferrule body, a rear notch is arranged at the rear end of the lens body, a plurality of rear lens parts are arranged at the bottom of the rear notch, the rear lens parts are aligned with the end surfaces of the optical fibers one by one, the lens body includes a total reflection surface, a plurality of lower lens parts are arranged below the total reflection surface of the lens body, the lower lens parts correspond to the PD chips one by one, the optical signals emitted by the optical fibers pass through the rear lens parts and are transmitted to the total reflection surface, the optical signals reflected by the total reflection surface pass through the lower lens parts and are transmitted to the PD chips.

[0006] Preferably, the rear end surface of the lens body is an inclined plane, and the rear end surface of the lens body and the front end surface of the ferrule body are mutually attached.

[0007] Preferably, the rear end of the lens body is formed with two front and rear extending insertion posts, the insertion core body is provided with two front and rear extending insertion holes, the insertion posts and the insertion holes are one-to-one corresponding, the insertion posts are inserted into the insertion holes and tightly fit with each other.

[0008] Preferably, the rear end of the insertion core body is provided with a fixing port, the optical fiber insertion hole is arranged on the front side wall of the fixing port, and glue is arranged in the fixing port.

[0009] Preferably, the fixing port is provided with a stepped portion, and a plurality of accommodating grooves are arranged on the stepped portion and correspond to the optical fiber insertion holes.

[0010] Preferably, the rear end of the optical fiber insertion hole is formed with a wide mouth portion.

[0011] Preferably, the top of the lens body is provided with an upper groove, and the total reflection surface is formed at the bottom of the upper groove.

[0012] In the optical structure of the optical module receiving end disclosed by the utility model, the lens body and the insertion core body are arranged in sequence front and rear, and are assembled through plug-in mode, and the rear lens part and the end face of the optical fiber are aligned at the same time. When the optical fiber emits laser signal, the laser signal passes through the rear lens part and is transmitted to the total reflection surface, and then the laser signal is reflected to the lower lens part through the total reflection surface, and finally passes through the lower lens part and is transmitted to the PD chip. Compared with the prior art, the light signal emitted by the optical fiber is incident to the lens body, and then is obliquely hit on the PD chip at a certain angle, so as to achieve the purpose of optimizing the return loss. The utility model has the advantages of simple structure, convenient assembly and lower application cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The utility model discloses an optical module receiving end optical structure Figure 1 ;

[0014] Figure 2 The utility model discloses an optical module receiving end optical structure Figure 2 ;

[0015] Figure 3 The utility model discloses an optical module receiving end optical structure Figure 1 ;

[0016] Figure 4 The utility model discloses an optical module receiving end optical structure Figure 2 ;

[0017] Figure 5 The utility model discloses an optical module receiving end optical structure

[0018] Figure 6 This is a schematic diagram of the optical path of the optical module receiver of this utility model;

[0019] Figure 7 This is a schematic diagram of the optical path of an existing optical module. Detailed Implementation

[0020] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0021] This utility model discloses an optical structure for an optical module receiver, combined with... Figures 1 to 6 As shown, it includes a lens body 1 and a ferrule body 2. The lens body 1 is located at the front end of the ferrule body 2 and the two are inserted into each other. Multiple PD chips 3 are located below the lens body 1. Multiple fiber optic jacks 20 for inserting optical fibers 100 are provided on the ferrule body 2. The front end face of the ferrule body 2 is a sloping plane with a forward-protruding top. The front end face of the optical fiber 100 is flush with the front end face of the ferrule body 2. The rear end of the lens body 1 has a rear recess 10, and the bottom of the rear recess 10 has a... Multiple rear lens sections 11 are aligned with the end faces of the optical fiber 100. The lens body 1 includes a total reflection surface 12. Multiple lower lens sections 13 are provided on the lens body 1 below the total reflection surface 12. Each lower lens section 13 corresponds to a PD chip 3. The light signal emitted from the optical fiber 100 passes through the rear lens section 11 and is transmitted to the total reflection surface 12. The light signal reflected by the total reflection surface 12 passes through the lower lens section 13 and is transmitted to the PD chip 3.

[0022] In the above structure, the lens body 1 and the ferrule body 2 are arranged sequentially, and they can be assembled by plugging them together. At the same time, the rear lens part 11 is aligned with the end face of the optical fiber 100. When the optical fiber 100 emits a laser signal, the laser signal passes through the rear lens part 11 and is transmitted to the total reflection surface 12. Then, the total reflection surface 12 reflects the laser signal to the lower lens part 13, and finally passes through the lower lens part 13 and is transmitted to the PD chip 3. Compared with the prior art, this utility model allows the light signal emitted by the optical fiber to be incident on the lens body 1 and then hit the PD chip 3 at a certain angle, thereby optimizing the return loss. At the same time, this utility model has a simple structure, is easy to assemble, and has a lower application cost.

[0023] In order to make the lens body 1 and the ferrule body 2 fit together more closely, in this embodiment, the rear end face of the lens body 1 is an oblique plane, and the rear end face of the lens body 1 and the front end face of the ferrule body 2 are in close contact with each other.

[0024] Regarding the preferred insertion and engagement method between the lens body 1 and the ferrule body 2, in this embodiment, the rear end of the lens body 1 forms two front-to-back extending insertion posts 14, and the ferrule body 2 has two front-to-back extending insertion holes 21. The insertion posts 14 and the insertion holes 21 correspond one-to-one, and the insertion posts 14 are inserted into the insertion holes 21 and the two are tightly engaged.

[0025] In the above structure, the insertion and cooperation of the two pins 14 and the two sockets 21 solves the technical problem of the lens body 1 and the ferrule body 2 being difficult to align front and back. At the same time, based on the cooperation of the rear end slope of the lens body 1 and the front end slope of the ferrule body 2, the lens body 1 and the ferrule body 2 can be more reliably combined together, thereby ensuring accurate transmission of optical signals. In addition, this embodiment can effectively ensure that the return loss of the optical fiber itself is maximized.

[0026] In a preferred embodiment, the rear end of the ferrule body 2 is provided with a fixing port 22, and the optical fiber jack 20 is opened on the front side wall of the fixing port 22. Adhesive is provided inside the fixing port 22. The adhesive filling the fixing port 22 serves to fix multiple optical fibers 100 in place.

[0027] To assist in positioning the optical fiber 100, in this embodiment, a stepped portion 23 is provided inside the fixing port 22, and a plurality of receiving slots 24 are provided on the stepped portion 23, and the receiving slots 24 correspond one-to-one with the optical fiber jack 20.

[0028] Furthermore, a wide opening 25 is formed at the rear end of the fiber optic jack 20. The purpose of providing the wide opening 25 at the rear end of the fiber optic jack 20 in this embodiment is to facilitate the insertion of the optical fiber 100.

[0029] As a preferred embodiment, the top of the lens body 1 is provided with an upper groove 15, and the total reflection surface 12 is formed at the bottom of the upper groove 15.

[0030] The optical structure of the optical module receiver disclosed in this utility model can effectively increase the return loss from a physical structure perspective, thereby reducing the bit error rate of the optical module. It can also effectively reduce the requirements for the reflectivity of the coating on the surface of the receiving chip PD, thus effectively reducing the application cost. At the same time, the optical path based on this optical design has a small focused spot size, so the overall coupling tolerance is large. Furthermore, this optical path structure does not require much modification to the original product structure, and the newly designed optical path can also achieve good compatibility with the original product. In addition, the product of this utility model is simple to mold, the product assembly process is simplified, and the yield of mass production is higher.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions or improvements made within the technical scope of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. An optical structure for an optical module receiver, characterized in that, The device includes a lens body and a ferrule body. The lens body is located at the front end of the ferrule body and the two are inserted into each other. Multiple PD chips are located below the lens body. Multiple fiber optic jacks for inserting optical fibers are opened on the ferrule body. The front end face of the ferrule body is a sloping plane with the top protruding forward. The front end face of the optical fiber is flush with the front end face of the ferrule body. The rear end of the lens body has a back notch. Multiple rear lens portions are located at the bottom of the back notch. Each rear lens portion is aligned with the end face of the optical fiber. The lens body includes a total reflection surface. Multiple lower lens portions are located on the lens body below the total reflection surface. Each lower lens portion corresponds to one of the PD chips. The light signal emitted from the optical fiber passes through the rear lens portions and is transmitted to the total reflection surface. The light signal reflected by the total reflection surface passes through the lower lens portions and is transmitted to the PD chip.

2. The optical structure of the optical module receiver as described in claim 1, characterized in that, The rear end face of the lens body is an oblique plane, and the rear end face of the lens body is in contact with the front end face of the ferrule body.

3. The optical structure of the optical module receiver as described in claim 1, characterized in that, The rear end of the lens body has two front-to-back extending posts, and the core body has two front-to-back extending insertion holes. The posts and insertion holes correspond one-to-one, and the posts are inserted into the insertion holes and the two fit tightly together.

4. The optical structure of the optical module receiver as described in claim 1, characterized in that, The rear end of the ferrule body is provided with a fixing port, the optical fiber jack is opened on the front side wall of the fixing port, and glue is provided inside the fixing port.

5. The optical structure of the optical module receiver as described in claim 4, characterized in that, The fixed port is provided with a stepped part, and the stepped part is provided with multiple receiving slots, each of which corresponds to a fiber optic jack.

6. The optical structure of the optical module receiver as described in claim 1, characterized in that, The rear end of the fiber optic jack has a wide opening.

7. The optical structure of the optical module receiver as described in claim 1, characterized in that, The top of the lens body is provided with an upper groove, and the total reflection surface is formed at the bottom of the upper groove.

Images