CN211718574U - Optical fiber receiver - Google Patents

Abstract

The utility model discloses an optical fiber receiver, including receiver unit and collimator unit, the receiver unit includes tube socket, body, flat window tube cap, PD chip and flat lens, and the tube socket is installed on the body, and the flat window tube cap is installed on the tube socket, and the front side of flat window tube cap is provided with the window, and flat lens installs on the window, and the PD chip sets up in the flat window tube cap, and the PD chip includes the pin, and the pin is installed on the tube socket; the collimator unit includes a C-LENS optically coupled to the pigtail and a pigtail, the C-LENS being disposed at a front side of the receiver unit. The utility model discloses use C-LENS LENS to carry out collimated light beam, can save the cost.

Description

Optical fiber receiver

Technical Field

The utility model belongs to the technical field of the optical communication, especially, relate to an optical fiber receiver.

Background

Optical Communication (Optical Communication) is a Communication method using an Optical wave as a carrier. With the advance of strategic process of broadband China, the optical communication industry in China presents a high-speed growth situation, and has penetrated into all corners of our lives by developing to the present. Optical communication is not isolated from basic communication to a wonderful network world and the like.

The optical fiber receiver mainly completes the functions of receiving optical signals and converting light into electric signals, and the output characteristics of the optical fiber receiver comprehensively reflect the performance of the whole optical communication system.

The existing optical fiber receiver uses the aspheric lens to collimate the light beam, but the aspheric lens product is not provided with a mature manufacturer in China, needs to be imported and has high cost.

SUMMERY OF THE UTILITY MODEL

To solve the problems in the background, the present invention provides a fiber optic receiver that can save cost by using a C-LENS to collimate a light beam.

In order to achieve the above object, the present invention provides an optical fiber receiver, including a receiver unit and a collimator unit, the receiver unit includes a tube seat, a tube body, a flat window tube cap, a PD chip and a flat lens, the tube seat is mounted on the tube body, the flat window tube cap is mounted on the tube seat, a window is disposed on a front side of the flat window tube cap, the flat lens is mounted on the window, the PD chip is disposed in the flat window tube cap, the PD chip includes a pin, and the pin is mounted on the tube seat;

the collimator unit includes a C-LENS optically coupled with a pigtail, and a pigtail disposed at a front side of the receiver unit.

Preferably, the receiver unit is a closed cavity.

Preferably, the collimator unit further comprises a protective sleeve disposed outside the collimator unit.

Further preferably, the collimator further comprises an adjusting ring disposed between the protective sheath and the collimator unit.

Preferably, the inner side of the pipe body is provided with a clamping groove, and the outer side of the flat window pipe cap is clamped in the clamping groove.

Preferably, the flat lens is mounted on the outer side or the inner side of the flat cap.

Preferably, the heat sink is mounted on the tube seat, and the PD chip is mounted on the heat sink.

Preferably, the pigtail is a single mode fiber or a multimode fiber.

Preferably, the material of the C-LENS is glass or plastic.

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

the cost of C-LENS is lower than that of non-spherical LENS;

2. the receiver unit adopts a flat window tube cap and a flat lens, so that sealing and packaging are easier to realize;

3. the coupling is easier to achieve by conducting collimated light between the receiver unit and the collimator unit.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the drawings, the reference numbers: 1. a tube holder; 2. a pipe body; 21. a card slot; 3. a flat window pipe cap; 4. a PD chip; 41. a pin; 5. a plate lens; 6. a heat sink; 7. a C-LENS; 8. tail fiber; 9. a protective sleeve; 10. an adjusting ring.

Detailed Description

In order to make the technical solution of the present invention more apparent, the present invention is further described in detail with reference to the following examples, and it should be understood that the specific embodiments described herein are only used for explaining the present invention, and are not used for limiting the present invention.

Referring to fig. 1, a fiber optic receiver includes a receiver unit and a collimator unit.

The receiver unit comprises a tube base 1, a tube body 2, a flat window tube cap 3, a PD chip 4, a flat lens 5 and a heat sink 6.

The tube seat 1 is arranged on the tube body 2, and the flat window tube cap 3 is arranged on the tube seat 1. The front side of the flat-window tube cap 3 is provided with a window, and the flat lens 5 is arranged on the inner side of the window.

The installation mode is welding or bonding, and the tube body 2, the flat window tube cap 3 and the flat lens 5 are matched to form a closed cavity. The sealed package of the receiver unit can protect the PD chip 4 arranged inside, so as to prevent dust and water vapor from entering the PD chip 4 and damaging the PD chip 4, and to oxidize the electrical connector to cause poor contact or influence the light transmission due to the internal air pressure change.

Wherein, the inboard of body 2 is provided with draw-in groove 21, and the outside card of casement window pipe cap 3 is located in draw-in groove 21 to improve the fixed reliability between body 2, casement window pipe cap 3 and the flat lens 5.

A window is provided in the receiver unit for allowing collimated light to enter the receiver unit, be received by the PD chip 4 and be converted into an electrical signal.

In other embodiments, the flat lens 5 may be mounted on the outer side of the window. The flat lens 5 is in the utility model provides an effect does: 1. protecting the PD chip 4; 2. the sealing performance is realized; 3. the aspheric lens used for replacing the original optical fiber receiver enables the light to be emitted.

Because the receiver unit adopts the structure that the flat window tube cap 4 and the flat lens 5 are matched, compared with the prior optical fiber receiver, the packaging structure is simpler, and the requirements on the packaging process and the packaging precision are reduced on the premise of ensuring the air tightness.

The heat sink 6 is arranged in the flat window tube cap 3, the PD chip 4 is arranged on the tube seat 1 through the heat sink 6, the heat sink 6 is used as a carrier of the PD chip 4, and the heat sink 6 has high heat conductivity and can conduct heat generated on the PD chip 4.

The PD chip 4 includes leads 41, and the leads 41 are mounted on the header 1 and extend to the outside of the receiver unit to output electrical signals.

The collimator unit comprises a C-LENS 7 and a pigtail 8, the C-LENS 7 being glued to the front side of the receiver unit.

The C-lens 7 is a cylindrical lens, and the front end of the lens forms an inclined end surface inclined to the axis thereof and the rear end forms a spherical surface.

The C-LENS 7 is made of glass or plastic.

The outer side of the C-LENS LENS 7 is provided with a glass capillary, and the tail fiber 8 penetrates into the glass capillary. During assembly, the relative position of the end face of the tail fiber 8 and the C-LENS LENS 7 is adjusted, the optical coupling between the tail fiber 8 and the C-LENS LENS 7 is realized by means of detection of a beam analyzer, and then the tail fiber 8 is bonded on the glass capillary through glue.

The C-LENS 7 is used to collimate the light transmitted and emitted from the pigtail 8, so that the divergent light is converted into collimated light and then enters the receiver unit.

The C-LENS 7 replaces the aspheric LENS used by the original optical fiber receiver to realize the collimation of the light. On one hand, the non-spherical lens which needs to be imported is not needed, and the cost of the product can be reduced.

On the other hand, the collimated light is approximate to parallel light, is not influenced by the focal length, and is not sensitive to the accuracy of the mounting position of the element, and when two collimated light paths are coupled with each other, the coupling tolerance is very large, and the position accuracy is not sensitive. Since the light emitted from the C-LENS 7 is collimated light, i.e., the collimator unit and the receiver unit conduct collimated light, when the two are coupled, only two-dimensional adjustment along the vertical plane of the optical axis is required, and no third-dimensional adjustment along the optical axis direction is required.

Furthermore, the advantage of large tolerance of the parallel light path can reduce the difficulty caused by possible offset when the collimator unit and the receiver unit are installed.

The utility model discloses can be applicable to the receipt that realizes single mode fiber and multimode fiber outgoing light simultaneously, pigtail 8 can be single mode fiber or multimode fiber promptly.

The outside of collimator unit is provided with protective sheath 9, protects to the collimator unit, can cushion or keep apart the direct contact of foreign object to external force in the use, avoids the collimator unit to damage and leads to the utility model discloses can't realize the conduction of light.

The rear end of the protective sleeve 9 is connected to the tube body 2 and can assist in maintaining the coupling effect between the collimator unit and the receiver unit.

Be provided with adjustable ring 10 between protective sheath 9 and the collimator unit, the inside and outside both sides of adjustable ring 10 are fixed with collimator unit and protective sheath 9 respectively, avoid the collimator unit to produce in protective sheath 9 and rock, influence the conduction of light.

The utility model discloses a total light path is the divergent light of 8 outgoing of tail optical fiber and carries out the collimation back through C-LENS LENS 7, jets into inside the receiver unit, is received by PD chip 4.

The utility model discloses compare original fiber optic receiver simple structure, improved the assembly efficiency and the coupling efficiency of component, conveniently produce.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (9)

1. An optical fiber receiver is characterized by comprising a receiver unit and a collimator unit, wherein the receiver unit comprises a tube seat, a tube body, a flat window tube cap, a PD chip and a flat lens, the tube seat is installed on the tube body, the flat window tube cap is installed on the tube seat, a window is arranged on the front side of the flat window tube cap, the flat lens is installed on the window, the PD chip is arranged in the flat window tube cap, the PD chip comprises a pin, and the pin is installed on the tube seat;

the collimator unit includes a C-LENS optically coupled with a pigtail, and a pigtail disposed at a front side of the receiver unit.

2. A fibre optic receiver according to claim 1 wherein the receiver unit is a closed cavity.

3. The fiber optic receiver of claim 1, further comprising a protective sleeve disposed outside the collimator unit.

4. The fiber optic receiver of claim 3, further comprising an adjustment ring disposed between the protective sheath and the collimator unit.

5. The optical fiber receiver according to claim 1, wherein a clamping groove is formed on the inner side of the tube body, and the outer side of the flat window tube cap is clamped in the clamping groove.

6. The fiber optic receiver of claim 1, wherein the flat lens is mounted on an outside or an inside of the flat window tube cap.

7. The fiber optic receiver of claim 1, further comprising a heat sink mounted on the header, the PD chip being mounted on the heat sink.

8. The fiber optic receiver of claim 1, wherein the pigtail is a single mode fiber or a multimode fiber.

9. The fiber optic receiver of claim 1, wherein the C-LENS is made of glass or plastic.

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